1/* 2 * Copyright (c) 1994, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package java.lang; 27 28import java.lang.annotation.Annotation; 29import java.lang.module.ModuleReader; 30import java.lang.ref.SoftReference; 31import java.io.IOException; 32import java.io.InputStream; 33import java.io.ObjectStreamField; 34import java.lang.reflect.AnnotatedElement; 35import java.lang.reflect.AnnotatedType; 36import java.lang.reflect.Array; 37import java.lang.reflect.Constructor; 38import java.lang.reflect.Executable; 39import java.lang.reflect.Field; 40import java.lang.reflect.GenericArrayType; 41import java.lang.reflect.GenericDeclaration; 42import java.lang.reflect.InvocationTargetException; 43import java.lang.reflect.Member; 44import java.lang.reflect.Method; 45import java.lang.reflect.Modifier; 46import java.lang.reflect.Proxy; 47import java.lang.reflect.Type; 48import java.lang.reflect.TypeVariable; 49import java.net.URL; 50import java.security.AccessController; 51import java.security.PrivilegedAction; 52import java.util.ArrayList; 53import java.util.Arrays; 54import java.util.Collection; 55import java.util.HashMap; 56import java.util.HashSet; 57import java.util.LinkedHashMap; 58import java.util.List; 59import java.util.Map; 60import java.util.Objects; 61import java.util.Set; 62import java.util.StringJoiner; 63 64import jdk.internal.HotSpotIntrinsicCandidate; 65import jdk.internal.loader.BootLoader; 66import jdk.internal.loader.BuiltinClassLoader; 67import jdk.internal.misc.Unsafe; 68import jdk.internal.misc.VM; 69import jdk.internal.module.Resources; 70import jdk.internal.reflect.CallerSensitive; 71import jdk.internal.reflect.ConstantPool; 72import jdk.internal.reflect.Reflection; 73import jdk.internal.reflect.ReflectionFactory; 74import jdk.internal.vm.annotation.ForceInline; 75import sun.reflect.generics.factory.CoreReflectionFactory; 76import sun.reflect.generics.factory.GenericsFactory; 77import sun.reflect.generics.repository.ClassRepository; 78import sun.reflect.generics.repository.MethodRepository; 79import sun.reflect.generics.repository.ConstructorRepository; 80import sun.reflect.generics.scope.ClassScope; 81import sun.security.util.SecurityConstants; 82import sun.reflect.annotation.*; 83import sun.reflect.misc.ReflectUtil; 84 85/** 86 * Instances of the class {@code Class} represent classes and 87 * interfaces in a running Java application. An enum is a kind of 88 * class and an annotation is a kind of interface. Every array also 89 * belongs to a class that is reflected as a {@code Class} object 90 * that is shared by all arrays with the same element type and number 91 * of dimensions. The primitive Java types ({@code boolean}, 92 * {@code byte}, {@code char}, {@code short}, 93 * {@code int}, {@code long}, {@code float}, and 94 * {@code double}), and the keyword {@code void} are also 95 * represented as {@code Class} objects. 96 * 97 * <p> {@code Class} has no public constructor. Instead {@code Class} 98 * objects are constructed automatically by the Java Virtual Machine as classes 99 * are loaded and by calls to the {@code defineClass} method in the class 100 * loader. 101 * 102 * <p> The following example uses a {@code Class} object to print the 103 * class name of an object: 104 * 105 * <blockquote><pre> 106 * void printClassName(Object obj) { 107 * System.out.println("The class of " + obj + 108 * " is " + obj.getClass().getName()); 109 * } 110 * </pre></blockquote> 111 * 112 * <p> It is also possible to get the {@code Class} object for a named 113 * type (or for void) using a class literal. See Section 15.8.2 of 114 * <cite>The Java™ Language Specification</cite>. 115 * For example: 116 * 117 * <blockquote> 118 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());} 119 * </blockquote> 120 * 121 * @param <T> the type of the class modeled by this {@code Class} 122 * object. For example, the type of {@code String.class} is {@code 123 * Class<String>}. Use {@code Class<?>} if the class being modeled is 124 * unknown. 125 * 126 * @author unascribed 127 * @see java.lang.ClassLoader#defineClass(byte[], int, int) 128 * @since 1.0 129 */ 130public final class Class<T> implements java.io.Serializable, 131 GenericDeclaration, 132 Type, 133 AnnotatedElement { 134 private static final int ANNOTATION= 0x00002000; 135 private static final int ENUM = 0x00004000; 136 private static final int SYNTHETIC = 0x00001000; 137 138 private static native void registerNatives(); 139 static { 140 registerNatives(); 141 } 142 143 /* 144 * Private constructor. Only the Java Virtual Machine creates Class objects. 145 * This constructor is not used and prevents the default constructor being 146 * generated. 147 */ 148 private Class(ClassLoader loader, Class<?> arrayComponentType) { 149 // Initialize final field for classLoader. The initialization value of non-null 150 // prevents future JIT optimizations from assuming this final field is null. 151 classLoader = loader; 152 componentType = arrayComponentType; 153 } 154 155 /** 156 * Converts the object to a string. The string representation is the 157 * string "class" or "interface", followed by a space, and then by the 158 * fully qualified name of the class in the format returned by 159 * {@code getName}. If this {@code Class} object represents a 160 * primitive type, this method returns the name of the primitive type. If 161 * this {@code Class} object represents void this method returns 162 * "void". If this {@code Class} object represents an array type, 163 * this method returns "class " followed by {@code getName}. 164 * 165 * @return a string representation of this class object. 166 */ 167 public String toString() { 168 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class ")) 169 + getName(); 170 } 171 172 /** 173 * Returns a string describing this {@code Class}, including 174 * information about modifiers and type parameters. 175 * 176 * The string is formatted as a list of type modifiers, if any, 177 * followed by the kind of type (empty string for primitive types 178 * and {@code class}, {@code enum}, {@code interface}, or 179 * <code>@</code>{@code interface}, as appropriate), followed 180 * by the type's name, followed by an angle-bracketed 181 * comma-separated list of the type's type parameters, if any. 182 * 183 * A space is used to separate modifiers from one another and to 184 * separate any modifiers from the kind of type. The modifiers 185 * occur in canonical order. If there are no type parameters, the 186 * type parameter list is elided. 187 * 188 * For an array type, the string starts with the type name, 189 * followed by an angle-bracketed comma-separated list of the 190 * type's type parameters, if any, followed by a sequence of 191 * {@code []} characters, one set of brackets per dimension of 192 * the array. 193 * 194 * <p>Note that since information about the runtime representation 195 * of a type is being generated, modifiers not present on the 196 * originating source code or illegal on the originating source 197 * code may be present. 198 * 199 * @return a string describing this {@code Class}, including 200 * information about modifiers and type parameters 201 * 202 * @since 1.8 203 */ 204 public String toGenericString() { 205 if (isPrimitive()) { 206 return toString(); 207 } else { 208 StringBuilder sb = new StringBuilder(); 209 Class<?> component = this; 210 int arrayDepth = 0; 211 212 if (isArray()) { 213 do { 214 arrayDepth++; 215 component = component.getComponentType(); 216 } while (component.isArray()); 217 sb.append(component.getName()); 218 } else { 219 // Class modifiers are a superset of interface modifiers 220 int modifiers = getModifiers() & Modifier.classModifiers(); 221 if (modifiers != 0) { 222 sb.append(Modifier.toString(modifiers)); 223 sb.append(' '); 224 } 225 226 if (isAnnotation()) { 227 sb.append('@'); 228 } 229 if (isInterface()) { // Note: all annotation types are interfaces 230 sb.append("interface"); 231 } else { 232 if (isEnum()) 233 sb.append("enum"); 234 else 235 sb.append("class"); 236 } 237 sb.append(' '); 238 sb.append(getName()); 239 } 240 241 TypeVariable<?>[] typeparms = component.getTypeParameters(); 242 if (typeparms.length > 0) { 243 StringJoiner sj = new StringJoiner(",", "<", ">"); 244 for(TypeVariable<?> typeparm: typeparms) { 245 sj.add(typeparm.getTypeName()); 246 } 247 sb.append(sj.toString()); 248 } 249 250 for (int i = 0; i < arrayDepth; i++) 251 sb.append("[]"); 252 253 return sb.toString(); 254 } 255 } 256 257 /** 258 * Returns the {@code Class} object associated with the class or 259 * interface with the given string name. Invoking this method is 260 * equivalent to: 261 * 262 * <blockquote> 263 * {@code Class.forName(className, true, currentLoader)} 264 * </blockquote> 265 * 266 * where {@code currentLoader} denotes the defining class loader of 267 * the current class. 268 * 269 * <p> For example, the following code fragment returns the 270 * runtime {@code Class} descriptor for the class named 271 * {@code java.lang.Thread}: 272 * 273 * <blockquote> 274 * {@code Class t = Class.forName("java.lang.Thread")} 275 * </blockquote> 276 * <p> 277 * A call to {@code forName("X")} causes the class named 278 * {@code X} to be initialized. 279 * 280 * @param className the fully qualified name of the desired class. 281 * @return the {@code Class} object for the class with the 282 * specified name. 283 * @exception LinkageError if the linkage fails 284 * @exception ExceptionInInitializerError if the initialization provoked 285 * by this method fails 286 * @exception ClassNotFoundException if the class cannot be located 287 */ 288 @CallerSensitive 289 public static Class<?> forName(String className) 290 throws ClassNotFoundException { 291 Class<?> caller = Reflection.getCallerClass(); 292 return forName0(className, true, ClassLoader.getClassLoader(caller), caller); 293 } 294 295 296 /** 297 * Returns the {@code Class} object associated with the class or 298 * interface with the given string name, using the given class loader. 299 * Given the fully qualified name for a class or interface (in the same 300 * format returned by {@code getName}) this method attempts to 301 * locate, load, and link the class or interface. The specified class 302 * loader is used to load the class or interface. If the parameter 303 * {@code loader} is null, the class is loaded through the bootstrap 304 * class loader. The class is initialized only if the 305 * {@code initialize} parameter is {@code true} and if it has 306 * not been initialized earlier. 307 * 308 * <p> If {@code name} denotes a primitive type or void, an attempt 309 * will be made to locate a user-defined class in the unnamed package whose 310 * name is {@code name}. Therefore, this method cannot be used to 311 * obtain any of the {@code Class} objects representing primitive 312 * types or void. 313 * 314 * <p> If {@code name} denotes an array class, the component type of 315 * the array class is loaded but not initialized. 316 * 317 * <p> For example, in an instance method the expression: 318 * 319 * <blockquote> 320 * {@code Class.forName("Foo")} 321 * </blockquote> 322 * 323 * is equivalent to: 324 * 325 * <blockquote> 326 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())} 327 * </blockquote> 328 * 329 * Note that this method throws errors related to loading, linking or 330 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The 331 * Java Language Specification</em>. 332 * Note that this method does not check whether the requested class 333 * is accessible to its caller. 334 * 335 * @param name fully qualified name of the desired class 336 * @param initialize if {@code true} the class will be initialized. 337 * See Section 12.4 of <em>The Java Language Specification</em>. 338 * @param loader class loader from which the class must be loaded 339 * @return class object representing the desired class 340 * 341 * @exception LinkageError if the linkage fails 342 * @exception ExceptionInInitializerError if the initialization provoked 343 * by this method fails 344 * @exception ClassNotFoundException if the class cannot be located by 345 * the specified class loader 346 * @exception SecurityException 347 * if a security manager is present, and the {@code loader} is 348 * {@code null}, and the caller's class loader is not 349 * {@code null}, and the caller does not have the 350 * {@link RuntimePermission}{@code ("getClassLoader")} 351 * 352 * @see java.lang.Class#forName(String) 353 * @see java.lang.ClassLoader 354 * @since 1.2 355 */ 356 @CallerSensitive 357 public static Class<?> forName(String name, boolean initialize, 358 ClassLoader loader) 359 throws ClassNotFoundException 360 { 361 Class<?> caller = null; 362 SecurityManager sm = System.getSecurityManager(); 363 if (sm != null) { 364 // Reflective call to get caller class is only needed if a security manager 365 // is present. Avoid the overhead of making this call otherwise. 366 caller = Reflection.getCallerClass(); 367 if (loader == null) { 368 ClassLoader ccl = ClassLoader.getClassLoader(caller); 369 if (ccl != null) { 370 sm.checkPermission( 371 SecurityConstants.GET_CLASSLOADER_PERMISSION); 372 } 373 } 374 } 375 return forName0(name, initialize, loader, caller); 376 } 377 378 /** Called after security check for system loader access checks have been made. */ 379 private static native Class<?> forName0(String name, boolean initialize, 380 ClassLoader loader, 381 Class<?> caller) 382 throws ClassNotFoundException; 383 384 385 /** 386 * Returns the {@code Class} with the given <a href="ClassLoader.html#name"> 387 * binary name</a> in the given module. 388 * 389 * <p> This method attempts to locate, load, and link the class or interface. 390 * It does not run the class initializer. If the class is not found, this 391 * method returns {@code null}. </p> 392 * 393 * <p> If the class loader of the given module defines other modules and 394 * the given name is a class defined in a different module, this method 395 * returns {@code null} after the class is loaded. </p> 396 * 397 * <p> This method does not check whether the requested class is 398 * accessible to its caller. </p> 399 * 400 * @apiNote 401 * This method returns {@code null} on failure rather than 402 * throwing a {@link ClassNotFoundException}, as is done by 403 * the {@link #forName(String, boolean, ClassLoader)} method. 404 * The security check is a stack-based permission check if the caller 405 * loads a class in another module. 406 * 407 * @param module A module 408 * @param name The <a href="ClassLoader.html#name">binary name</a> 409 * of the class 410 * @return {@code Class} object of the given name defined in the given module; 411 * {@code null} if not found. 412 * 413 * @throws NullPointerException if the given module or name is {@code null} 414 * 415 * @throws LinkageError if the linkage fails 416 * 417 * @throws SecurityException 418 * <ul> 419 * <li> if the caller is not the specified module and 420 * {@code RuntimePermission("getClassLoader")} permission is denied; or</li> 421 * <li> access to the module content is denied. For example, 422 * permission check will be performed when a class loader calls 423 * {@link ModuleReader#open(String)} to read the bytes of a class file 424 * in a module.</li> 425 * </ul> 426 * 427 * @since 9 428 * @spec JPMS 429 */ 430 @CallerSensitive 431 public static Class<?> forName(Module module, String name) { 432 Objects.requireNonNull(module); 433 Objects.requireNonNull(name); 434 435 ClassLoader cl; 436 SecurityManager sm = System.getSecurityManager(); 437 if (sm != null) { 438 Class<?> caller = Reflection.getCallerClass(); 439 if (caller != null && caller.getModule() != module) { 440 // if caller is null, Class.forName is the last java frame on the stack. 441 // java.base has all permissions 442 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); 443 } 444 PrivilegedAction<ClassLoader> pa = module::getClassLoader; 445 cl = AccessController.doPrivileged(pa); 446 } else { 447 cl = module.getClassLoader(); 448 } 449 450 if (cl != null) { 451 return cl.loadClass(module, name); 452 } else { 453 return BootLoader.loadClass(module, name); 454 } 455 } 456 457 /** 458 * Creates a new instance of the class represented by this {@code Class} 459 * object. The class is instantiated as if by a {@code new} 460 * expression with an empty argument list. The class is initialized if it 461 * has not already been initialized. 462 * 463 * @deprecated This method propagates any exception thrown by the 464 * nullary constructor, including a checked exception. Use of 465 * this method effectively bypasses the compile-time exception 466 * checking that would otherwise be performed by the compiler. 467 * The {@link 468 * java.lang.reflect.Constructor#newInstance(java.lang.Object...) 469 * Constructor.newInstance} method avoids this problem by wrapping 470 * any exception thrown by the constructor in a (checked) {@link 471 * java.lang.reflect.InvocationTargetException}. 472 * 473 * <p>The call 474 * 475 * <pre>{@code 476 * clazz.newInstance() 477 * }</pre> 478 * 479 * can be replaced by 480 * 481 * <pre>{@code 482 * clazz.getDeclaredConstructor().newInstance() 483 * }</pre> 484 * 485 * The latter sequence of calls is inferred to be able to throw 486 * the additional exception types {@link 487 * InvocationTargetException} and {@link 488 * NoSuchMethodException}. Both of these exception types are 489 * subclasses of {@link ReflectiveOperationException}. 490 * 491 * @return a newly allocated instance of the class represented by this 492 * object. 493 * @throws IllegalAccessException if the class or its nullary 494 * constructor is not accessible. 495 * @throws InstantiationException 496 * if this {@code Class} represents an abstract class, 497 * an interface, an array class, a primitive type, or void; 498 * or if the class has no nullary constructor; 499 * or if the instantiation fails for some other reason. 500 * @throws ExceptionInInitializerError if the initialization 501 * provoked by this method fails. 502 * @throws SecurityException 503 * If a security manager, <i>s</i>, is present and 504 * the caller's class loader is not the same as or an 505 * ancestor of the class loader for the current class and 506 * invocation of {@link SecurityManager#checkPackageAccess 507 * s.checkPackageAccess()} denies access to the package 508 * of this class. 509 */ 510 @CallerSensitive 511 @Deprecated(since="9") 512 public T newInstance() 513 throws InstantiationException, IllegalAccessException 514 { 515 SecurityManager sm = System.getSecurityManager(); 516 if (sm != null) { 517 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false); 518 } 519 520 // NOTE: the following code may not be strictly correct under 521 // the current Java memory model. 522 523 // Constructor lookup 524 if (cachedConstructor == null) { 525 if (this == Class.class) { 526 throw new IllegalAccessException( 527 "Can not call newInstance() on the Class for java.lang.Class" 528 ); 529 } 530 try { 531 Class<?>[] empty = {}; 532 final Constructor<T> c = getReflectionFactory().copyConstructor( 533 getConstructor0(empty, Member.DECLARED)); 534 // Disable accessibility checks on the constructor 535 // since we have to do the security check here anyway 536 // (the stack depth is wrong for the Constructor's 537 // security check to work) 538 java.security.AccessController.doPrivileged( 539 new java.security.PrivilegedAction<>() { 540 public Void run() { 541 c.setAccessible(true); 542 return null; 543 } 544 }); 545 cachedConstructor = c; 546 } catch (NoSuchMethodException e) { 547 throw (InstantiationException) 548 new InstantiationException(getName()).initCause(e); 549 } 550 } 551 Constructor<T> tmpConstructor = cachedConstructor; 552 // Security check (same as in java.lang.reflect.Constructor) 553 Class<?> caller = Reflection.getCallerClass(); 554 if (newInstanceCallerCache != caller) { 555 int modifiers = tmpConstructor.getModifiers(); 556 Reflection.ensureMemberAccess(caller, this, this, modifiers); 557 newInstanceCallerCache = caller; 558 } 559 // Run constructor 560 try { 561 return tmpConstructor.newInstance((Object[])null); 562 } catch (InvocationTargetException e) { 563 Unsafe.getUnsafe().throwException(e.getTargetException()); 564 // Not reached 565 return null; 566 } 567 } 568 private transient volatile Constructor<T> cachedConstructor; 569 private transient volatile Class<?> newInstanceCallerCache; 570 571 572 /** 573 * Determines if the specified {@code Object} is assignment-compatible 574 * with the object represented by this {@code Class}. This method is 575 * the dynamic equivalent of the Java language {@code instanceof} 576 * operator. The method returns {@code true} if the specified 577 * {@code Object} argument is non-null and can be cast to the 578 * reference type represented by this {@code Class} object without 579 * raising a {@code ClassCastException.} It returns {@code false} 580 * otherwise. 581 * 582 * <p> Specifically, if this {@code Class} object represents a 583 * declared class, this method returns {@code true} if the specified 584 * {@code Object} argument is an instance of the represented class (or 585 * of any of its subclasses); it returns {@code false} otherwise. If 586 * this {@code Class} object represents an array class, this method 587 * returns {@code true} if the specified {@code Object} argument 588 * can be converted to an object of the array class by an identity 589 * conversion or by a widening reference conversion; it returns 590 * {@code false} otherwise. If this {@code Class} object 591 * represents an interface, this method returns {@code true} if the 592 * class or any superclass of the specified {@code Object} argument 593 * implements this interface; it returns {@code false} otherwise. If 594 * this {@code Class} object represents a primitive type, this method 595 * returns {@code false}. 596 * 597 * @param obj the object to check 598 * @return true if {@code obj} is an instance of this class 599 * 600 * @since 1.1 601 */ 602 @HotSpotIntrinsicCandidate 603 public native boolean isInstance(Object obj); 604 605 606 /** 607 * Determines if the class or interface represented by this 608 * {@code Class} object is either the same as, or is a superclass or 609 * superinterface of, the class or interface represented by the specified 610 * {@code Class} parameter. It returns {@code true} if so; 611 * otherwise it returns {@code false}. If this {@code Class} 612 * object represents a primitive type, this method returns 613 * {@code true} if the specified {@code Class} parameter is 614 * exactly this {@code Class} object; otherwise it returns 615 * {@code false}. 616 * 617 * <p> Specifically, this method tests whether the type represented by the 618 * specified {@code Class} parameter can be converted to the type 619 * represented by this {@code Class} object via an identity conversion 620 * or via a widening reference conversion. See <em>The Java Language 621 * Specification</em>, sections 5.1.1 and 5.1.4 , for details. 622 * 623 * @param cls the {@code Class} object to be checked 624 * @return the {@code boolean} value indicating whether objects of the 625 * type {@code cls} can be assigned to objects of this class 626 * @exception NullPointerException if the specified Class parameter is 627 * null. 628 * @since 1.1 629 */ 630 @HotSpotIntrinsicCandidate 631 public native boolean isAssignableFrom(Class<?> cls); 632 633 634 /** 635 * Determines if the specified {@code Class} object represents an 636 * interface type. 637 * 638 * @return {@code true} if this object represents an interface; 639 * {@code false} otherwise. 640 */ 641 @HotSpotIntrinsicCandidate 642 public native boolean isInterface(); 643 644 645 /** 646 * Determines if this {@code Class} object represents an array class. 647 * 648 * @return {@code true} if this object represents an array class; 649 * {@code false} otherwise. 650 * @since 1.1 651 */ 652 @HotSpotIntrinsicCandidate 653 public native boolean isArray(); 654 655 656 /** 657 * Determines if the specified {@code Class} object represents a 658 * primitive type. 659 * 660 * <p> There are nine predefined {@code Class} objects to represent 661 * the eight primitive types and void. These are created by the Java 662 * Virtual Machine, and have the same names as the primitive types that 663 * they represent, namely {@code boolean}, {@code byte}, 664 * {@code char}, {@code short}, {@code int}, 665 * {@code long}, {@code float}, and {@code double}. 666 * 667 * <p> These objects may only be accessed via the following public static 668 * final variables, and are the only {@code Class} objects for which 669 * this method returns {@code true}. 670 * 671 * @return true if and only if this class represents a primitive type 672 * 673 * @see java.lang.Boolean#TYPE 674 * @see java.lang.Character#TYPE 675 * @see java.lang.Byte#TYPE 676 * @see java.lang.Short#TYPE 677 * @see java.lang.Integer#TYPE 678 * @see java.lang.Long#TYPE 679 * @see java.lang.Float#TYPE 680 * @see java.lang.Double#TYPE 681 * @see java.lang.Void#TYPE 682 * @since 1.1 683 */ 684 @HotSpotIntrinsicCandidate 685 public native boolean isPrimitive(); 686 687 /** 688 * Returns true if this {@code Class} object represents an annotation 689 * type. Note that if this method returns true, {@link #isInterface()} 690 * would also return true, as all annotation types are also interfaces. 691 * 692 * @return {@code true} if this class object represents an annotation 693 * type; {@code false} otherwise 694 * @since 1.5 695 */ 696 public boolean isAnnotation() { 697 return (getModifiers() & ANNOTATION) != 0; 698 } 699 700 /** 701 * Returns {@code true} if this class is a synthetic class; 702 * returns {@code false} otherwise. 703 * @return {@code true} if and only if this class is a synthetic class as 704 * defined by the Java Language Specification. 705 * @jls 13.1 The Form of a Binary 706 * @since 1.5 707 */ 708 public boolean isSynthetic() { 709 return (getModifiers() & SYNTHETIC) != 0; 710 } 711 712 /** 713 * Returns the name of the entity (class, interface, array class, 714 * primitive type, or void) represented by this {@code Class} object, 715 * as a {@code String}. 716 * 717 * <p> If this class object represents a reference type that is not an 718 * array type then the binary name of the class is returned, as specified 719 * by 720 * <cite>The Java™ Language Specification</cite>. 721 * 722 * <p> If this class object represents a primitive type or void, then the 723 * name returned is a {@code String} equal to the Java language 724 * keyword corresponding to the primitive type or void. 725 * 726 * <p> If this class object represents a class of arrays, then the internal 727 * form of the name consists of the name of the element type preceded by 728 * one or more '{@code [}' characters representing the depth of the array 729 * nesting. The encoding of element type names is as follows: 730 * 731 * <blockquote><table class="striped"> 732 * <caption style="display:none">Element types and encodings</caption> 733 * <thead> 734 * <tr><th scope="col"> Element Type <th scope="col"> Encoding 735 * </thead> 736 * <tbody style="text-align:left"> 737 * <tr><th scope="row"> boolean <td style="text-align:center"> Z 738 * <tr><th scope="row"> byte <td style="text-align:center"> B 739 * <tr><th scope="row"> char <td style="text-align:center"> C 740 * <tr><th scope="row"> class or interface 741 * <td style="text-align:center"> L<i>classname</i>; 742 * <tr><th scope="row"> double <td style="text-align:center"> D 743 * <tr><th scope="row"> float <td style="text-align:center"> F 744 * <tr><th scope="row"> int <td style="text-align:center"> I 745 * <tr><th scope="row"> long <td style="text-align:center"> J 746 * <tr><th scope="row"> short <td style="text-align:center"> S 747 * </tbody> 748 * </table></blockquote> 749 * 750 * <p> The class or interface name <i>classname</i> is the binary name of 751 * the class specified above. 752 * 753 * <p> Examples: 754 * <blockquote><pre> 755 * String.class.getName() 756 * returns "java.lang.String" 757 * byte.class.getName() 758 * returns "byte" 759 * (new Object[3]).getClass().getName() 760 * returns "[Ljava.lang.Object;" 761 * (new int[3][4][5][6][7][8][9]).getClass().getName() 762 * returns "[[[[[[[I" 763 * </pre></blockquote> 764 * 765 * @return the name of the class or interface 766 * represented by this object. 767 */ 768 public String getName() { 769 String name = this.name; 770 if (name == null) 771 this.name = name = getName0(); 772 return name; 773 } 774 775 // cache the name to reduce the number of calls into the VM 776 private transient String name; 777 private native String getName0(); 778 779 /** 780 * Returns the class loader for the class. Some implementations may use 781 * null to represent the bootstrap class loader. This method will return 782 * null in such implementations if this class was loaded by the bootstrap 783 * class loader. 784 * 785 * <p>If this object 786 * represents a primitive type or void, null is returned. 787 * 788 * @return the class loader that loaded the class or interface 789 * represented by this object. 790 * @throws SecurityException 791 * if a security manager is present, and the caller's class loader 792 * is not {@code null} and is not the same as or an ancestor of the 793 * class loader for the class whose class loader is requested, 794 * and the caller does not have the 795 * {@link RuntimePermission}{@code ("getClassLoader")} 796 * @see java.lang.ClassLoader 797 * @see SecurityManager#checkPermission 798 * @see java.lang.RuntimePermission 799 */ 800 @CallerSensitive 801 @ForceInline // to ensure Reflection.getCallerClass optimization 802 public ClassLoader getClassLoader() { 803 ClassLoader cl = getClassLoader0(); 804 if (cl == null) 805 return null; 806 SecurityManager sm = System.getSecurityManager(); 807 if (sm != null) { 808 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass()); 809 } 810 return cl; 811 } 812 813 // Package-private to allow ClassLoader access 814 ClassLoader getClassLoader0() { return classLoader; } 815 816 /** 817 * Returns the module that this class or interface is a member of. 818 * 819 * If this class represents an array type then this method returns the 820 * {@code Module} for the element type. If this class represents a 821 * primitive type or void, then the {@code Module} object for the 822 * {@code java.base} module is returned. 823 * 824 * If this class is in an unnamed module then the {@link 825 * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class 826 * loader for this class is returned. 827 * 828 * @return the module that this class or interface is a member of 829 * 830 * @since 9 831 * @spec JPMS 832 */ 833 public Module getModule() { 834 return module; 835 } 836 837 // set by VM 838 private transient Module module; 839 840 // Initialized in JVM not by private constructor 841 // This field is filtered from reflection access, i.e. getDeclaredField 842 // will throw NoSuchFieldException 843 private final ClassLoader classLoader; 844 845 /** 846 * Returns an array of {@code TypeVariable} objects that represent the 847 * type variables declared by the generic declaration represented by this 848 * {@code GenericDeclaration} object, in declaration order. Returns an 849 * array of length 0 if the underlying generic declaration declares no type 850 * variables. 851 * 852 * @return an array of {@code TypeVariable} objects that represent 853 * the type variables declared by this generic declaration 854 * @throws java.lang.reflect.GenericSignatureFormatError if the generic 855 * signature of this generic declaration does not conform to 856 * the format specified in 857 * <cite>The Java™ Virtual Machine Specification</cite> 858 * @since 1.5 859 */ 860 @SuppressWarnings("unchecked") 861 public TypeVariable<Class<T>>[] getTypeParameters() { 862 ClassRepository info = getGenericInfo(); 863 if (info != null) 864 return (TypeVariable<Class<T>>[])info.getTypeParameters(); 865 else 866 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0]; 867 } 868 869 870 /** 871 * Returns the {@code Class} representing the direct superclass of the 872 * entity (class, interface, primitive type or void) represented by 873 * this {@code Class}. If this {@code Class} represents either the 874 * {@code Object} class, an interface, a primitive type, or void, then 875 * null is returned. If this object represents an array class then the 876 * {@code Class} object representing the {@code Object} class is 877 * returned. 878 * 879 * @return the direct superclass of the class represented by this object 880 */ 881 @HotSpotIntrinsicCandidate 882 public native Class<? super T> getSuperclass(); 883 884 885 /** 886 * Returns the {@code Type} representing the direct superclass of 887 * the entity (class, interface, primitive type or void) represented by 888 * this {@code Class}. 889 * 890 * <p>If the superclass is a parameterized type, the {@code Type} 891 * object returned must accurately reflect the actual type 892 * parameters used in the source code. The parameterized type 893 * representing the superclass is created if it had not been 894 * created before. See the declaration of {@link 895 * java.lang.reflect.ParameterizedType ParameterizedType} for the 896 * semantics of the creation process for parameterized types. If 897 * this {@code Class} represents either the {@code Object} 898 * class, an interface, a primitive type, or void, then null is 899 * returned. If this object represents an array class then the 900 * {@code Class} object representing the {@code Object} class is 901 * returned. 902 * 903 * @throws java.lang.reflect.GenericSignatureFormatError if the generic 904 * class signature does not conform to the format specified in 905 * <cite>The Java™ Virtual Machine Specification</cite> 906 * @throws TypeNotPresentException if the generic superclass 907 * refers to a non-existent type declaration 908 * @throws java.lang.reflect.MalformedParameterizedTypeException if the 909 * generic superclass refers to a parameterized type that cannot be 910 * instantiated for any reason 911 * @return the direct superclass of the class represented by this object 912 * @since 1.5 913 */ 914 public Type getGenericSuperclass() { 915 ClassRepository info = getGenericInfo(); 916 if (info == null) { 917 return getSuperclass(); 918 } 919 920 // Historical irregularity: 921 // Generic signature marks interfaces with superclass = Object 922 // but this API returns null for interfaces 923 if (isInterface()) { 924 return null; 925 } 926 927 return info.getSuperclass(); 928 } 929 930 /** 931 * Gets the package of this class. 932 * 933 * <p>If this class represents an array type, a primitive type or void, 934 * this method returns {@code null}. 935 * 936 * @return the package of this class. 937 * @revised 9 938 * @spec JPMS 939 */ 940 public Package getPackage() { 941 if (isPrimitive() || isArray()) { 942 return null; 943 } 944 ClassLoader cl = getClassLoader0(); 945 return cl != null ? cl.definePackage(this) 946 : BootLoader.definePackage(this); 947 } 948 949 /** 950 * Returns the fully qualified package name. 951 * 952 * <p> If this class is a top level class, then this method returns the fully 953 * qualified name of the package that the class is a member of, or the 954 * empty string if the class is in an unnamed package. 955 * 956 * <p> If this class is a member class, then this method is equivalent to 957 * invoking {@code getPackageName()} on the {@link #getEnclosingClass 958 * enclosing class}. 959 * 960 * <p> If this class is a {@link #isLocalClass local class} or an {@link 961 * #isAnonymousClass() anonymous class}, then this method is equivalent to 962 * invoking {@code getPackageName()} on the {@link #getDeclaringClass 963 * declaring class} of the {@link #getEnclosingMethod enclosing method} or 964 * {@link #getEnclosingConstructor enclosing constructor}. 965 * 966 * <p> If this class represents an array type then this method returns the 967 * package name of the element type. If this class represents a primitive 968 * type or void then the package name "{@code java.lang}" is returned. 969 * 970 * @return the fully qualified package name 971 * 972 * @since 9 973 * @spec JPMS 974 * @jls 6.7 Fully Qualified Names 975 */ 976 public String getPackageName() { 977 String pn = this.packageName; 978 if (pn == null) { 979 Class<?> c = this; 980 while (c.isArray()) { 981 c = c.getComponentType(); 982 } 983 if (c.isPrimitive()) { 984 pn = "java.lang"; 985 } else { 986 String cn = c.getName(); 987 int dot = cn.lastIndexOf('.'); 988 pn = (dot != -1) ? cn.substring(0, dot).intern() : ""; 989 } 990 this.packageName = pn; 991 } 992 return pn; 993 } 994 995 // cached package name 996 private transient String packageName; 997 998 /** 999 * Returns the interfaces directly implemented by the class or interface 1000 * represented by this object. 1001 * 1002 * <p>If this object represents a class, the return value is an array 1003 * containing objects representing all interfaces directly implemented by 1004 * the class. The order of the interface objects in the array corresponds 1005 * to the order of the interface names in the {@code implements} clause of 1006 * the declaration of the class represented by this object. For example, 1007 * given the declaration: 1008 * <blockquote> 1009 * {@code class Shimmer implements FloorWax, DessertTopping { ... }} 1010 * </blockquote> 1011 * suppose the value of {@code s} is an instance of 1012 * {@code Shimmer}; the value of the expression: 1013 * <blockquote> 1014 * {@code s.getClass().getInterfaces()[0]} 1015 * </blockquote> 1016 * is the {@code Class} object that represents interface 1017 * {@code FloorWax}; and the value of: 1018 * <blockquote> 1019 * {@code s.getClass().getInterfaces()[1]} 1020 * </blockquote> 1021 * is the {@code Class} object that represents interface 1022 * {@code DessertTopping}. 1023 * 1024 * <p>If this object represents an interface, the array contains objects 1025 * representing all interfaces directly extended by the interface. The 1026 * order of the interface objects in the array corresponds to the order of 1027 * the interface names in the {@code extends} clause of the declaration of 1028 * the interface represented by this object. 1029 * 1030 * <p>If this object represents a class or interface that implements no 1031 * interfaces, the method returns an array of length 0. 1032 * 1033 * <p>If this object represents a primitive type or void, the method 1034 * returns an array of length 0. 1035 * 1036 * <p>If this {@code Class} object represents an array type, the 1037 * interfaces {@code Cloneable} and {@code java.io.Serializable} are 1038 * returned in that order. 1039 * 1040 * @return an array of interfaces directly implemented by this class 1041 */ 1042 public Class<?>[] getInterfaces() { 1043 // defensively copy before handing over to user code 1044 return getInterfaces(true); 1045 } 1046 1047 private Class<?>[] getInterfaces(boolean cloneArray) { 1048 ReflectionData<T> rd = reflectionData(); 1049 if (rd == null) { 1050 // no cloning required 1051 return getInterfaces0(); 1052 } else { 1053 Class<?>[] interfaces = rd.interfaces; 1054 if (interfaces == null) { 1055 interfaces = getInterfaces0(); 1056 rd.interfaces = interfaces; 1057 } 1058 // defensively copy if requested 1059 return cloneArray ? interfaces.clone() : interfaces; 1060 } 1061 } 1062 1063 private native Class<?>[] getInterfaces0(); 1064 1065 /** 1066 * Returns the {@code Type}s representing the interfaces 1067 * directly implemented by the class or interface represented by 1068 * this object. 1069 * 1070 * <p>If a superinterface is a parameterized type, the 1071 * {@code Type} object returned for it must accurately reflect 1072 * the actual type parameters used in the source code. The 1073 * parameterized type representing each superinterface is created 1074 * if it had not been created before. See the declaration of 1075 * {@link java.lang.reflect.ParameterizedType ParameterizedType} 1076 * for the semantics of the creation process for parameterized 1077 * types. 1078 * 1079 * <p>If this object represents a class, the return value is an array 1080 * containing objects representing all interfaces directly implemented by 1081 * the class. The order of the interface objects in the array corresponds 1082 * to the order of the interface names in the {@code implements} clause of 1083 * the declaration of the class represented by this object. 1084 * 1085 * <p>If this object represents an interface, the array contains objects 1086 * representing all interfaces directly extended by the interface. The 1087 * order of the interface objects in the array corresponds to the order of 1088 * the interface names in the {@code extends} clause of the declaration of 1089 * the interface represented by this object. 1090 * 1091 * <p>If this object represents a class or interface that implements no 1092 * interfaces, the method returns an array of length 0. 1093 * 1094 * <p>If this object represents a primitive type or void, the method 1095 * returns an array of length 0. 1096 * 1097 * <p>If this {@code Class} object represents an array type, the 1098 * interfaces {@code Cloneable} and {@code java.io.Serializable} are 1099 * returned in that order. 1100 * 1101 * @throws java.lang.reflect.GenericSignatureFormatError 1102 * if the generic class signature does not conform to the format 1103 * specified in 1104 * <cite>The Java™ Virtual Machine Specification</cite> 1105 * @throws TypeNotPresentException if any of the generic 1106 * superinterfaces refers to a non-existent type declaration 1107 * @throws java.lang.reflect.MalformedParameterizedTypeException 1108 * if any of the generic superinterfaces refer to a parameterized 1109 * type that cannot be instantiated for any reason 1110 * @return an array of interfaces directly implemented by this class 1111 * @since 1.5 1112 */ 1113 public Type[] getGenericInterfaces() { 1114 ClassRepository info = getGenericInfo(); 1115 return (info == null) ? getInterfaces() : info.getSuperInterfaces(); 1116 } 1117 1118 1119 /** 1120 * Returns the {@code Class} representing the component type of an 1121 * array. If this class does not represent an array class this method 1122 * returns null. 1123 * 1124 * @return the {@code Class} representing the component type of this 1125 * class if this class is an array 1126 * @see java.lang.reflect.Array 1127 * @since 1.1 1128 */ 1129 public Class<?> getComponentType() { 1130 // Only return for array types. Storage may be reused for Class for instance types. 1131 if (isArray()) { 1132 return componentType; 1133 } else { 1134 return null; 1135 } 1136 } 1137 1138 private final Class<?> componentType; 1139 1140 1141 /** 1142 * Returns the Java language modifiers for this class or interface, encoded 1143 * in an integer. The modifiers consist of the Java Virtual Machine's 1144 * constants for {@code public}, {@code protected}, 1145 * {@code private}, {@code final}, {@code static}, 1146 * {@code abstract} and {@code interface}; they should be decoded 1147 * using the methods of class {@code Modifier}. 1148 * 1149 * <p> If the underlying class is an array class, then its 1150 * {@code public}, {@code private} and {@code protected} 1151 * modifiers are the same as those of its component type. If this 1152 * {@code Class} represents a primitive type or void, its 1153 * {@code public} modifier is always {@code true}, and its 1154 * {@code protected} and {@code private} modifiers are always 1155 * {@code false}. If this object represents an array class, a 1156 * primitive type or void, then its {@code final} modifier is always 1157 * {@code true} and its interface modifier is always 1158 * {@code false}. The values of its other modifiers are not determined 1159 * by this specification. 1160 * 1161 * <p> The modifier encodings are defined in <em>The Java Virtual Machine 1162 * Specification</em>, table 4.1. 1163 * 1164 * @return the {@code int} representing the modifiers for this class 1165 * @see java.lang.reflect.Modifier 1166 * @since 1.1 1167 */ 1168 @HotSpotIntrinsicCandidate 1169 public native int getModifiers(); 1170 1171 1172 /** 1173 * Gets the signers of this class. 1174 * 1175 * @return the signers of this class, or null if there are no signers. In 1176 * particular, this method returns null if this object represents 1177 * a primitive type or void. 1178 * @since 1.1 1179 */ 1180 public native Object[] getSigners(); 1181 1182 1183 /** 1184 * Set the signers of this class. 1185 */ 1186 native void setSigners(Object[] signers); 1187 1188 1189 /** 1190 * If this {@code Class} object represents a local or anonymous 1191 * class within a method, returns a {@link 1192 * java.lang.reflect.Method Method} object representing the 1193 * immediately enclosing method of the underlying class. Returns 1194 * {@code null} otherwise. 1195 * 1196 * In particular, this method returns {@code null} if the underlying 1197 * class is a local or anonymous class immediately enclosed by a type 1198 * declaration, instance initializer or static initializer. 1199 * 1200 * @return the immediately enclosing method of the underlying class, if 1201 * that class is a local or anonymous class; otherwise {@code null}. 1202 * 1203 * @throws SecurityException 1204 * If a security manager, <i>s</i>, is present and any of the 1205 * following conditions is met: 1206 * 1207 * <ul> 1208 * 1209 * <li> the caller's class loader is not the same as the 1210 * class loader of the enclosing class and invocation of 1211 * {@link SecurityManager#checkPermission 1212 * s.checkPermission} method with 1213 * {@code RuntimePermission("accessDeclaredMembers")} 1214 * denies access to the methods within the enclosing class 1215 * 1216 * <li> the caller's class loader is not the same as or an 1217 * ancestor of the class loader for the enclosing class and 1218 * invocation of {@link SecurityManager#checkPackageAccess 1219 * s.checkPackageAccess()} denies access to the package 1220 * of the enclosing class 1221 * 1222 * </ul> 1223 * @since 1.5 1224 */ 1225 @CallerSensitive 1226 public Method getEnclosingMethod() throws SecurityException { 1227 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1228 1229 if (enclosingInfo == null) 1230 return null; 1231 else { 1232 if (!enclosingInfo.isMethod()) 1233 return null; 1234 1235 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(), 1236 getFactory()); 1237 Class<?> returnType = toClass(typeInfo.getReturnType()); 1238 Type [] parameterTypes = typeInfo.getParameterTypes(); 1239 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; 1240 1241 // Convert Types to Classes; returned types *should* 1242 // be class objects since the methodDescriptor's used 1243 // don't have generics information 1244 for(int i = 0; i < parameterClasses.length; i++) 1245 parameterClasses[i] = toClass(parameterTypes[i]); 1246 1247 // Perform access check 1248 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass(); 1249 SecurityManager sm = System.getSecurityManager(); 1250 if (sm != null) { 1251 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED, 1252 Reflection.getCallerClass(), true); 1253 } 1254 Method[] candidates = enclosingCandidate.privateGetDeclaredMethods(false); 1255 1256 /* 1257 * Loop over all declared methods; match method name, 1258 * number of and type of parameters, *and* return 1259 * type. Matching return type is also necessary 1260 * because of covariant returns, etc. 1261 */ 1262 ReflectionFactory fact = getReflectionFactory(); 1263 for (Method m : candidates) { 1264 if (m.getName().equals(enclosingInfo.getName()) && 1265 arrayContentsEq(parameterClasses, 1266 fact.getExecutableSharedParameterTypes(m))) { 1267 // finally, check return type 1268 if (m.getReturnType().equals(returnType)) { 1269 return fact.copyMethod(m); 1270 } 1271 } 1272 } 1273 1274 throw new InternalError("Enclosing method not found"); 1275 } 1276 } 1277 1278 private native Object[] getEnclosingMethod0(); 1279 1280 private EnclosingMethodInfo getEnclosingMethodInfo() { 1281 Object[] enclosingInfo = getEnclosingMethod0(); 1282 if (enclosingInfo == null) 1283 return null; 1284 else { 1285 return new EnclosingMethodInfo(enclosingInfo); 1286 } 1287 } 1288 1289 private static final class EnclosingMethodInfo { 1290 private final Class<?> enclosingClass; 1291 private final String name; 1292 private final String descriptor; 1293 1294 static void validate(Object[] enclosingInfo) { 1295 if (enclosingInfo.length != 3) 1296 throw new InternalError("Malformed enclosing method information"); 1297 try { 1298 // The array is expected to have three elements: 1299 1300 // the immediately enclosing class 1301 Class<?> enclosingClass = (Class<?>)enclosingInfo[0]; 1302 assert(enclosingClass != null); 1303 1304 // the immediately enclosing method or constructor's 1305 // name (can be null). 1306 String name = (String)enclosingInfo[1]; 1307 1308 // the immediately enclosing method or constructor's 1309 // descriptor (null iff name is). 1310 String descriptor = (String)enclosingInfo[2]; 1311 assert((name != null && descriptor != null) || name == descriptor); 1312 } catch (ClassCastException cce) { 1313 throw new InternalError("Invalid type in enclosing method information", cce); 1314 } 1315 } 1316 1317 EnclosingMethodInfo(Object[] enclosingInfo) { 1318 validate(enclosingInfo); 1319 this.enclosingClass = (Class<?>)enclosingInfo[0]; 1320 this.name = (String)enclosingInfo[1]; 1321 this.descriptor = (String)enclosingInfo[2]; 1322 } 1323 1324 boolean isPartial() { 1325 return enclosingClass == null || name == null || descriptor == null; 1326 } 1327 1328 boolean isConstructor() { return !isPartial() && "<init>".equals(name); } 1329 1330 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); } 1331 1332 Class<?> getEnclosingClass() { return enclosingClass; } 1333 1334 String getName() { return name; } 1335 1336 String getDescriptor() { return descriptor; } 1337 1338 } 1339 1340 private static Class<?> toClass(Type o) { 1341 if (o instanceof GenericArrayType) 1342 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()), 1343 0) 1344 .getClass(); 1345 return (Class<?>)o; 1346 } 1347 1348 /** 1349 * If this {@code Class} object represents a local or anonymous 1350 * class within a constructor, returns a {@link 1351 * java.lang.reflect.Constructor Constructor} object representing 1352 * the immediately enclosing constructor of the underlying 1353 * class. Returns {@code null} otherwise. In particular, this 1354 * method returns {@code null} if the underlying class is a local 1355 * or anonymous class immediately enclosed by a type declaration, 1356 * instance initializer or static initializer. 1357 * 1358 * @return the immediately enclosing constructor of the underlying class, if 1359 * that class is a local or anonymous class; otherwise {@code null}. 1360 * @throws SecurityException 1361 * If a security manager, <i>s</i>, is present and any of the 1362 * following conditions is met: 1363 * 1364 * <ul> 1365 * 1366 * <li> the caller's class loader is not the same as the 1367 * class loader of the enclosing class and invocation of 1368 * {@link SecurityManager#checkPermission 1369 * s.checkPermission} method with 1370 * {@code RuntimePermission("accessDeclaredMembers")} 1371 * denies access to the constructors within the enclosing class 1372 * 1373 * <li> the caller's class loader is not the same as or an 1374 * ancestor of the class loader for the enclosing class and 1375 * invocation of {@link SecurityManager#checkPackageAccess 1376 * s.checkPackageAccess()} denies access to the package 1377 * of the enclosing class 1378 * 1379 * </ul> 1380 * @since 1.5 1381 */ 1382 @CallerSensitive 1383 public Constructor<?> getEnclosingConstructor() throws SecurityException { 1384 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1385 1386 if (enclosingInfo == null) 1387 return null; 1388 else { 1389 if (!enclosingInfo.isConstructor()) 1390 return null; 1391 1392 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(), 1393 getFactory()); 1394 Type [] parameterTypes = typeInfo.getParameterTypes(); 1395 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length]; 1396 1397 // Convert Types to Classes; returned types *should* 1398 // be class objects since the methodDescriptor's used 1399 // don't have generics information 1400 for(int i = 0; i < parameterClasses.length; i++) 1401 parameterClasses[i] = toClass(parameterTypes[i]); 1402 1403 // Perform access check 1404 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass(); 1405 SecurityManager sm = System.getSecurityManager(); 1406 if (sm != null) { 1407 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED, 1408 Reflection.getCallerClass(), true); 1409 } 1410 1411 Constructor<?>[] candidates = enclosingCandidate 1412 .privateGetDeclaredConstructors(false); 1413 /* 1414 * Loop over all declared constructors; match number 1415 * of and type of parameters. 1416 */ 1417 ReflectionFactory fact = getReflectionFactory(); 1418 for (Constructor<?> c : candidates) { 1419 if (arrayContentsEq(parameterClasses, 1420 fact.getExecutableSharedParameterTypes(c))) { 1421 return fact.copyConstructor(c); 1422 } 1423 } 1424 1425 throw new InternalError("Enclosing constructor not found"); 1426 } 1427 } 1428 1429 1430 /** 1431 * If the class or interface represented by this {@code Class} object 1432 * is a member of another class, returns the {@code Class} object 1433 * representing the class in which it was declared. This method returns 1434 * null if this class or interface is not a member of any other class. If 1435 * this {@code Class} object represents an array class, a primitive 1436 * type, or void,then this method returns null. 1437 * 1438 * @return the declaring class for this class 1439 * @throws SecurityException 1440 * If a security manager, <i>s</i>, is present and the caller's 1441 * class loader is not the same as or an ancestor of the class 1442 * loader for the declaring class and invocation of {@link 1443 * SecurityManager#checkPackageAccess s.checkPackageAccess()} 1444 * denies access to the package of the declaring class 1445 * @since 1.1 1446 */ 1447 @CallerSensitive 1448 public Class<?> getDeclaringClass() throws SecurityException { 1449 final Class<?> candidate = getDeclaringClass0(); 1450 1451 if (candidate != null) { 1452 SecurityManager sm = System.getSecurityManager(); 1453 if (sm != null) { 1454 candidate.checkPackageAccess(sm, 1455 ClassLoader.getClassLoader(Reflection.getCallerClass()), true); 1456 } 1457 } 1458 return candidate; 1459 } 1460 1461 private native Class<?> getDeclaringClass0(); 1462 1463 1464 /** 1465 * Returns the immediately enclosing class of the underlying 1466 * class. If the underlying class is a top level class this 1467 * method returns {@code null}. 1468 * @return the immediately enclosing class of the underlying class 1469 * @exception SecurityException 1470 * If a security manager, <i>s</i>, is present and the caller's 1471 * class loader is not the same as or an ancestor of the class 1472 * loader for the enclosing class and invocation of {@link 1473 * SecurityManager#checkPackageAccess s.checkPackageAccess()} 1474 * denies access to the package of the enclosing class 1475 * @since 1.5 1476 */ 1477 @CallerSensitive 1478 public Class<?> getEnclosingClass() throws SecurityException { 1479 // There are five kinds of classes (or interfaces): 1480 // a) Top level classes 1481 // b) Nested classes (static member classes) 1482 // c) Inner classes (non-static member classes) 1483 // d) Local classes (named classes declared within a method) 1484 // e) Anonymous classes 1485 1486 1487 // JVM Spec 4.7.7: A class must have an EnclosingMethod 1488 // attribute if and only if it is a local class or an 1489 // anonymous class. 1490 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo(); 1491 Class<?> enclosingCandidate; 1492 1493 if (enclosingInfo == null) { 1494 // This is a top level or a nested class or an inner class (a, b, or c) 1495 enclosingCandidate = getDeclaringClass0(); 1496 } else { 1497 Class<?> enclosingClass = enclosingInfo.getEnclosingClass(); 1498 // This is a local class or an anonymous class (d or e) 1499 if (enclosingClass == this || enclosingClass == null) 1500 throw new InternalError("Malformed enclosing method information"); 1501 else 1502 enclosingCandidate = enclosingClass; 1503 } 1504 1505 if (enclosingCandidate != null) { 1506 SecurityManager sm = System.getSecurityManager(); 1507 if (sm != null) { 1508 enclosingCandidate.checkPackageAccess(sm, 1509 ClassLoader.getClassLoader(Reflection.getCallerClass()), true); 1510 } 1511 } 1512 return enclosingCandidate; 1513 } 1514 1515 /** 1516 * Returns the simple name of the underlying class as given in the 1517 * source code. Returns an empty string if the underlying class is 1518 * anonymous. 1519 * 1520 * <p>The simple name of an array is the simple name of the 1521 * component type with "[]" appended. In particular the simple 1522 * name of an array whose component type is anonymous is "[]". 1523 * 1524 * @return the simple name of the underlying class 1525 * @since 1.5 1526 */ 1527 public String getSimpleName() { 1528 if (isArray()) 1529 return getComponentType().getSimpleName()+"[]"; 1530 1531 String simpleName = getSimpleBinaryName(); 1532 if (simpleName == null) { // top level class 1533 simpleName = getName(); 1534 return simpleName.substring(simpleName.lastIndexOf('.')+1); // strip the package name 1535 } 1536 return simpleName; 1537 } 1538 1539 /** 1540 * Return an informative string for the name of this type. 1541 * 1542 * @return an informative string for the name of this type 1543 * @since 1.8 1544 */ 1545 public String getTypeName() { 1546 if (isArray()) { 1547 try { 1548 Class<?> cl = this; 1549 int dimensions = 0; 1550 while (cl.isArray()) { 1551 dimensions++; 1552 cl = cl.getComponentType(); 1553 } 1554 StringBuilder sb = new StringBuilder(); 1555 sb.append(cl.getName()); 1556 for (int i = 0; i < dimensions; i++) { 1557 sb.append("[]"); 1558 } 1559 return sb.toString(); 1560 } catch (Throwable e) { /*FALLTHRU*/ } 1561 } 1562 return getName(); 1563 } 1564 1565 /** 1566 * Returns the canonical name of the underlying class as 1567 * defined by the Java Language Specification. Returns null if 1568 * the underlying class does not have a canonical name (i.e., if 1569 * it is a local or anonymous class or an array whose component 1570 * type does not have a canonical name). 1571 * @return the canonical name of the underlying class if it exists, and 1572 * {@code null} otherwise. 1573 * @since 1.5 1574 */ 1575 public String getCanonicalName() { 1576 if (isArray()) { 1577 String canonicalName = getComponentType().getCanonicalName(); 1578 if (canonicalName != null) 1579 return canonicalName + "[]"; 1580 else 1581 return null; 1582 } 1583 if (isLocalOrAnonymousClass()) 1584 return null; 1585 Class<?> enclosingClass = getEnclosingClass(); 1586 if (enclosingClass == null) { // top level class 1587 return getName(); 1588 } else { 1589 String enclosingName = enclosingClass.getCanonicalName(); 1590 if (enclosingName == null) 1591 return null; 1592 return enclosingName + "." + getSimpleName(); 1593 } 1594 } 1595 1596 /** 1597 * Returns {@code true} if and only if the underlying class 1598 * is an anonymous class. 1599 * 1600 * @return {@code true} if and only if this class is an anonymous class. 1601 * @since 1.5 1602 */ 1603 public boolean isAnonymousClass() { 1604 return !isArray() && isLocalOrAnonymousClass() && 1605 getSimpleBinaryName0() == null; 1606 } 1607 1608 /** 1609 * Returns {@code true} if and only if the underlying class 1610 * is a local class. 1611 * 1612 * @return {@code true} if and only if this class is a local class. 1613 * @since 1.5 1614 */ 1615 public boolean isLocalClass() { 1616 return isLocalOrAnonymousClass() && 1617 (isArray() || getSimpleBinaryName0() != null); 1618 } 1619 1620 /** 1621 * Returns {@code true} if and only if the underlying class 1622 * is a member class. 1623 * 1624 * @return {@code true} if and only if this class is a member class. 1625 * @since 1.5 1626 */ 1627 public boolean isMemberClass() { 1628 return !isLocalOrAnonymousClass() && getDeclaringClass0() != null; 1629 } 1630 1631 /** 1632 * Returns the "simple binary name" of the underlying class, i.e., 1633 * the binary name without the leading enclosing class name. 1634 * Returns {@code null} if the underlying class is a top level 1635 * class. 1636 */ 1637 private String getSimpleBinaryName() { 1638 if (isTopLevelClass()) 1639 return null; 1640 String name = getSimpleBinaryName0(); 1641 if (name == null) // anonymous class 1642 return ""; 1643 return name; 1644 } 1645 1646 private native String getSimpleBinaryName0(); 1647 1648 /** 1649 * Returns {@code true} if this is a top level class. Returns {@code false} 1650 * otherwise. 1651 */ 1652 private boolean isTopLevelClass() { 1653 return !isLocalOrAnonymousClass() && getDeclaringClass0() == null; 1654 } 1655 1656 /** 1657 * Returns {@code true} if this is a local class or an anonymous 1658 * class. Returns {@code false} otherwise. 1659 */ 1660 private boolean isLocalOrAnonymousClass() { 1661 // JVM Spec 4.7.7: A class must have an EnclosingMethod 1662 // attribute if and only if it is a local class or an 1663 // anonymous class. 1664 return hasEnclosingMethodInfo(); 1665 } 1666 1667 private boolean hasEnclosingMethodInfo() { 1668 Object[] enclosingInfo = getEnclosingMethod0(); 1669 if (enclosingInfo != null) { 1670 EnclosingMethodInfo.validate(enclosingInfo); 1671 return true; 1672 } 1673 return false; 1674 } 1675 1676 /** 1677 * Returns an array containing {@code Class} objects representing all 1678 * the public classes and interfaces that are members of the class 1679 * represented by this {@code Class} object. This includes public 1680 * class and interface members inherited from superclasses and public class 1681 * and interface members declared by the class. This method returns an 1682 * array of length 0 if this {@code Class} object has no public member 1683 * classes or interfaces. This method also returns an array of length 0 if 1684 * this {@code Class} object represents a primitive type, an array 1685 * class, or void. 1686 * 1687 * @return the array of {@code Class} objects representing the public 1688 * members of this class 1689 * @throws SecurityException 1690 * If a security manager, <i>s</i>, is present and 1691 * the caller's class loader is not the same as or an 1692 * ancestor of the class loader for the current class and 1693 * invocation of {@link SecurityManager#checkPackageAccess 1694 * s.checkPackageAccess()} denies access to the package 1695 * of this class. 1696 * 1697 * @since 1.1 1698 */ 1699 @CallerSensitive 1700 public Class<?>[] getClasses() { 1701 SecurityManager sm = System.getSecurityManager(); 1702 if (sm != null) { 1703 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false); 1704 } 1705 1706 // Privileged so this implementation can look at DECLARED classes, 1707 // something the caller might not have privilege to do. The code here 1708 // is allowed to look at DECLARED classes because (1) it does not hand 1709 // out anything other than public members and (2) public member access 1710 // has already been ok'd by the SecurityManager. 1711 1712 return java.security.AccessController.doPrivileged( 1713 new java.security.PrivilegedAction<>() { 1714 public Class<?>[] run() { 1715 List<Class<?>> list = new ArrayList<>(); 1716 Class<?> currentClass = Class.this; 1717 while (currentClass != null) { 1718 for (Class<?> m : currentClass.getDeclaredClasses()) { 1719 if (Modifier.isPublic(m.getModifiers())) { 1720 list.add(m); 1721 } 1722 } 1723 currentClass = currentClass.getSuperclass(); 1724 } 1725 return list.toArray(new Class<?>[0]); 1726 } 1727 }); 1728 } 1729 1730 1731 /** 1732 * Returns an array containing {@code Field} objects reflecting all 1733 * the accessible public fields of the class or interface represented by 1734 * this {@code Class} object. 1735 * 1736 * <p> If this {@code Class} object represents a class or interface with 1737 * no accessible public fields, then this method returns an array of length 1738 * 0. 1739 * 1740 * <p> If this {@code Class} object represents a class, then this method 1741 * returns the public fields of the class and of all its superclasses and 1742 * superinterfaces. 1743 * 1744 * <p> If this {@code Class} object represents an interface, then this 1745 * method returns the fields of the interface and of all its 1746 * superinterfaces. 1747 * 1748 * <p> If this {@code Class} object represents an array type, a primitive 1749 * type, or void, then this method returns an array of length 0. 1750 * 1751 * <p> The elements in the returned array are not sorted and are not in any 1752 * particular order. 1753 * 1754 * @return the array of {@code Field} objects representing the 1755 * public fields 1756 * @throws SecurityException 1757 * If a security manager, <i>s</i>, is present and 1758 * the caller's class loader is not the same as or an 1759 * ancestor of the class loader for the current class and 1760 * invocation of {@link SecurityManager#checkPackageAccess 1761 * s.checkPackageAccess()} denies access to the package 1762 * of this class. 1763 * 1764 * @since 1.1 1765 * @jls 8.2 Class Members 1766 * @jls 8.3 Field Declarations 1767 */ 1768 @CallerSensitive 1769 public Field[] getFields() throws SecurityException { 1770 SecurityManager sm = System.getSecurityManager(); 1771 if (sm != null) { 1772 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true); 1773 } 1774 return copyFields(privateGetPublicFields(null)); 1775 } 1776 1777 1778 /** 1779 * Returns an array containing {@code Method} objects reflecting all the 1780 * public methods of the class or interface represented by this {@code 1781 * Class} object, including those declared by the class or interface and 1782 * those inherited from superclasses and superinterfaces. 1783 * 1784 * <p> If this {@code Class} object represents an array type, then the 1785 * returned array has a {@code Method} object for each of the public 1786 * methods inherited by the array type from {@code Object}. It does not 1787 * contain a {@code Method} object for {@code clone()}. 1788 * 1789 * <p> If this {@code Class} object represents an interface then the 1790 * returned array does not contain any implicitly declared methods from 1791 * {@code Object}. Therefore, if no methods are explicitly declared in 1792 * this interface or any of its superinterfaces then the returned array 1793 * has length 0. (Note that a {@code Class} object which represents a class 1794 * always has public methods, inherited from {@code Object}.) 1795 * 1796 * <p> The returned array never contains methods with names "{@code <init>}" 1797 * or "{@code <clinit>}". 1798 * 1799 * <p> The elements in the returned array are not sorted and are not in any 1800 * particular order. 1801 * 1802 * <p> Generally, the result is computed as with the following 4 step algorithm. 1803 * Let C be the class or interface represented by this {@code Class} object: 1804 * <ol> 1805 * <li> A union of methods is composed of: 1806 * <ol type="a"> 1807 * <li> C's declared public instance and static methods as returned by 1808 * {@link #getDeclaredMethods()} and filtered to include only public 1809 * methods.</li> 1810 * <li> If C is a class other than {@code Object}, then include the result 1811 * of invoking this algorithm recursively on the superclass of C.</li> 1812 * <li> Include the results of invoking this algorithm recursively on all 1813 * direct superinterfaces of C, but include only instance methods.</li> 1814 * </ol></li> 1815 * <li> Union from step 1 is partitioned into subsets of methods with same 1816 * signature (name, parameter types) and return type.</li> 1817 * <li> Within each such subset only the most specific methods are selected. 1818 * Let method M be a method from a set of methods with same signature 1819 * and return type. M is most specific if there is no such method 1820 * N != M from the same set, such that N is more specific than M. 1821 * N is more specific than M if: 1822 * <ol type="a"> 1823 * <li> N is declared by a class and M is declared by an interface; or</li> 1824 * <li> N and M are both declared by classes or both by interfaces and 1825 * N's declaring type is the same as or a subtype of M's declaring type 1826 * (clearly, if M's and N's declaring types are the same type, then 1827 * M and N are the same method).</li> 1828 * </ol></li> 1829 * <li> The result of this algorithm is the union of all selected methods from 1830 * step 3.</li> 1831 * </ol> 1832 * 1833 * @apiNote There may be more than one method with a particular name 1834 * and parameter types in a class because while the Java language forbids a 1835 * class to declare multiple methods with the same signature but different 1836 * return types, the Java virtual machine does not. This 1837 * increased flexibility in the virtual machine can be used to 1838 * implement various language features. For example, covariant 1839 * returns can be implemented with {@linkplain 1840 * java.lang.reflect.Method#isBridge bridge methods}; the bridge 1841 * method and the overriding method would have the same 1842 * signature but different return types. 1843 * 1844 * @return the array of {@code Method} objects representing the 1845 * public methods of this class 1846 * @throws SecurityException 1847 * If a security manager, <i>s</i>, is present and 1848 * the caller's class loader is not the same as or an 1849 * ancestor of the class loader for the current class and 1850 * invocation of {@link SecurityManager#checkPackageAccess 1851 * s.checkPackageAccess()} denies access to the package 1852 * of this class. 1853 * 1854 * @jls 8.2 Class Members 1855 * @jls 8.4 Method Declarations 1856 * @since 1.1 1857 */ 1858 @CallerSensitive 1859 public Method[] getMethods() throws SecurityException { 1860 SecurityManager sm = System.getSecurityManager(); 1861 if (sm != null) { 1862 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true); 1863 } 1864 return copyMethods(privateGetPublicMethods()); 1865 } 1866 1867 1868 /** 1869 * Returns an array containing {@code Constructor} objects reflecting 1870 * all the public constructors of the class represented by this 1871 * {@code Class} object. An array of length 0 is returned if the 1872 * class has no public constructors, or if the class is an array class, or 1873 * if the class reflects a primitive type or void. 1874 * 1875 * Note that while this method returns an array of {@code 1876 * Constructor<T>} objects (that is an array of constructors from 1877 * this class), the return type of this method is {@code 1878 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as 1879 * might be expected. This less informative return type is 1880 * necessary since after being returned from this method, the 1881 * array could be modified to hold {@code Constructor} objects for 1882 * different classes, which would violate the type guarantees of 1883 * {@code Constructor<T>[]}. 1884 * 1885 * @return the array of {@code Constructor} objects representing the 1886 * public constructors of this class 1887 * @throws SecurityException 1888 * If a security manager, <i>s</i>, is present and 1889 * the caller's class loader is not the same as or an 1890 * ancestor of the class loader for the current class and 1891 * invocation of {@link SecurityManager#checkPackageAccess 1892 * s.checkPackageAccess()} denies access to the package 1893 * of this class. 1894 * 1895 * @since 1.1 1896 */ 1897 @CallerSensitive 1898 public Constructor<?>[] getConstructors() throws SecurityException { 1899 SecurityManager sm = System.getSecurityManager(); 1900 if (sm != null) { 1901 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true); 1902 } 1903 return copyConstructors(privateGetDeclaredConstructors(true)); 1904 } 1905 1906 1907 /** 1908 * Returns a {@code Field} object that reflects the specified public member 1909 * field of the class or interface represented by this {@code Class} 1910 * object. The {@code name} parameter is a {@code String} specifying the 1911 * simple name of the desired field. 1912 * 1913 * <p> The field to be reflected is determined by the algorithm that 1914 * follows. Let C be the class or interface represented by this object: 1915 * 1916 * <OL> 1917 * <LI> If C declares a public field with the name specified, that is the 1918 * field to be reflected.</LI> 1919 * <LI> If no field was found in step 1 above, this algorithm is applied 1920 * recursively to each direct superinterface of C. The direct 1921 * superinterfaces are searched in the order they were declared.</LI> 1922 * <LI> If no field was found in steps 1 and 2 above, and C has a 1923 * superclass S, then this algorithm is invoked recursively upon S. 1924 * If C has no superclass, then a {@code NoSuchFieldException} 1925 * is thrown.</LI> 1926 * </OL> 1927 * 1928 * <p> If this {@code Class} object represents an array type, then this 1929 * method does not find the {@code length} field of the array type. 1930 * 1931 * @param name the field name 1932 * @return the {@code Field} object of this class specified by 1933 * {@code name} 1934 * @throws NoSuchFieldException if a field with the specified name is 1935 * not found. 1936 * @throws NullPointerException if {@code name} is {@code null} 1937 * @throws SecurityException 1938 * If a security manager, <i>s</i>, is present and 1939 * the caller's class loader is not the same as or an 1940 * ancestor of the class loader for the current class and 1941 * invocation of {@link SecurityManager#checkPackageAccess 1942 * s.checkPackageAccess()} denies access to the package 1943 * of this class. 1944 * 1945 * @since 1.1 1946 * @jls 8.2 Class Members 1947 * @jls 8.3 Field Declarations 1948 */ 1949 @CallerSensitive 1950 public Field getField(String name) 1951 throws NoSuchFieldException, SecurityException { 1952 Objects.requireNonNull(name); 1953 SecurityManager sm = System.getSecurityManager(); 1954 if (sm != null) { 1955 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true); 1956 } 1957 Field field = getField0(name); 1958 if (field == null) { 1959 throw new NoSuchFieldException(name); 1960 } 1961 return getReflectionFactory().copyField(field); 1962 } 1963 1964 1965 /** 1966 * Returns a {@code Method} object that reflects the specified public 1967 * member method of the class or interface represented by this 1968 * {@code Class} object. The {@code name} parameter is a 1969 * {@code String} specifying the simple name of the desired method. The 1970 * {@code parameterTypes} parameter is an array of {@code Class} 1971 * objects that identify the method's formal parameter types, in declared 1972 * order. If {@code parameterTypes} is {@code null}, it is 1973 * treated as if it were an empty array. 1974 * 1975 * <p> If this {@code Class} object represents an array type, then this 1976 * method finds any public method inherited by the array type from 1977 * {@code Object} except method {@code clone()}. 1978 * 1979 * <p> If this {@code Class} object represents an interface then this 1980 * method does not find any implicitly declared method from 1981 * {@code Object}. Therefore, if no methods are explicitly declared in 1982 * this interface or any of its superinterfaces, then this method does not 1983 * find any method. 1984 * 1985 * <p> This method does not find any method with name "{@code <init>}" or 1986 * "{@code <clinit>}". 1987 * 1988 * <p> Generally, the method to be reflected is determined by the 4 step 1989 * algorithm that follows. 1990 * Let C be the class or interface represented by this {@code Class} object: 1991 * <ol> 1992 * <li> A union of methods is composed of: 1993 * <ol type="a"> 1994 * <li> C's declared public instance and static methods as returned by 1995 * {@link #getDeclaredMethods()} and filtered to include only public 1996 * methods that match given {@code name} and {@code parameterTypes}</li> 1997 * <li> If C is a class other than {@code Object}, then include the result 1998 * of invoking this algorithm recursively on the superclass of C.</li> 1999 * <li> Include the results of invoking this algorithm recursively on all 2000 * direct superinterfaces of C, but include only instance methods.</li> 2001 * </ol></li> 2002 * <li> This union is partitioned into subsets of methods with same 2003 * return type (the selection of methods from step 1 also guarantees that 2004 * they have the same method name and parameter types).</li> 2005 * <li> Within each such subset only the most specific methods are selected. 2006 * Let method M be a method from a set of methods with same VM 2007 * signature (return type, name, parameter types). 2008 * M is most specific if there is no such method N != M from the same 2009 * set, such that N is more specific than M. N is more specific than M 2010 * if: 2011 * <ol type="a"> 2012 * <li> N is declared by a class and M is declared by an interface; or</li> 2013 * <li> N and M are both declared by classes or both by interfaces and 2014 * N's declaring type is the same as or a subtype of M's declaring type 2015 * (clearly, if M's and N's declaring types are the same type, then 2016 * M and N are the same method).</li> 2017 * </ol></li> 2018 * <li> The result of this algorithm is chosen arbitrarily from the methods 2019 * with most specific return type among all selected methods from step 3. 2020 * Let R be a return type of a method M from the set of all selected methods 2021 * from step 3. M is a method with most specific return type if there is 2022 * no such method N != M from the same set, having return type S != R, 2023 * such that S is a subtype of R as determined by 2024 * R.class.{@link #isAssignableFrom}(S.class). 2025 * </ol> 2026 * 2027 * @apiNote There may be more than one method with matching name and 2028 * parameter types in a class because while the Java language forbids a 2029 * class to declare multiple methods with the same signature but different 2030 * return types, the Java virtual machine does not. This 2031 * increased flexibility in the virtual machine can be used to 2032 * implement various language features. For example, covariant 2033 * returns can be implemented with {@linkplain 2034 * java.lang.reflect.Method#isBridge bridge methods}; the bridge 2035 * method and the overriding method would have the same 2036 * signature but different return types. This method would return the 2037 * overriding method as it would have a more specific return type. 2038 * 2039 * @param name the name of the method 2040 * @param parameterTypes the list of parameters 2041 * @return the {@code Method} object that matches the specified 2042 * {@code name} and {@code parameterTypes} 2043 * @throws NoSuchMethodException if a matching method is not found 2044 * or if the name is "<init>"or "<clinit>". 2045 * @throws NullPointerException if {@code name} is {@code null} 2046 * @throws SecurityException 2047 * If a security manager, <i>s</i>, is present and 2048 * the caller's class loader is not the same as or an 2049 * ancestor of the class loader for the current class and 2050 * invocation of {@link SecurityManager#checkPackageAccess 2051 * s.checkPackageAccess()} denies access to the package 2052 * of this class. 2053 * 2054 * @jls 8.2 Class Members 2055 * @jls 8.4 Method Declarations 2056 * @since 1.1 2057 */ 2058 @CallerSensitive 2059 public Method getMethod(String name, Class<?>... parameterTypes) 2060 throws NoSuchMethodException, SecurityException { 2061 Objects.requireNonNull(name); 2062 SecurityManager sm = System.getSecurityManager(); 2063 if (sm != null) { 2064 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true); 2065 } 2066 Method method = getMethod0(name, parameterTypes); 2067 if (method == null) { 2068 throw new NoSuchMethodException(methodToString(name, parameterTypes)); 2069 } 2070 return getReflectionFactory().copyMethod(method); 2071 } 2072 2073 /** 2074 * Returns a {@code Constructor} object that reflects the specified 2075 * public constructor of the class represented by this {@code Class} 2076 * object. The {@code parameterTypes} parameter is an array of 2077 * {@code Class} objects that identify the constructor's formal 2078 * parameter types, in declared order. 2079 * 2080 * If this {@code Class} object represents an inner class 2081 * declared in a non-static context, the formal parameter types 2082 * include the explicit enclosing instance as the first parameter. 2083 * 2084 * <p> The constructor to reflect is the public constructor of the class 2085 * represented by this {@code Class} object whose formal parameter 2086 * types match those specified by {@code parameterTypes}. 2087 * 2088 * @param parameterTypes the parameter array 2089 * @return the {@code Constructor} object of the public constructor that 2090 * matches the specified {@code parameterTypes} 2091 * @throws NoSuchMethodException if a matching method is not found. 2092 * @throws SecurityException 2093 * If a security manager, <i>s</i>, is present and 2094 * the caller's class loader is not the same as or an 2095 * ancestor of the class loader for the current class and 2096 * invocation of {@link SecurityManager#checkPackageAccess 2097 * s.checkPackageAccess()} denies access to the package 2098 * of this class. 2099 * 2100 * @since 1.1 2101 */ 2102 @CallerSensitive 2103 public Constructor<T> getConstructor(Class<?>... parameterTypes) 2104 throws NoSuchMethodException, SecurityException 2105 { 2106 SecurityManager sm = System.getSecurityManager(); 2107 if (sm != null) { 2108 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true); 2109 } 2110 return getReflectionFactory().copyConstructor( 2111 getConstructor0(parameterTypes, Member.PUBLIC)); 2112 } 2113 2114 2115 /** 2116 * Returns an array of {@code Class} objects reflecting all the 2117 * classes and interfaces declared as members of the class represented by 2118 * this {@code Class} object. This includes public, protected, default 2119 * (package) access, and private classes and interfaces declared by the 2120 * class, but excludes inherited classes and interfaces. This method 2121 * returns an array of length 0 if the class declares no classes or 2122 * interfaces as members, or if this {@code Class} object represents a 2123 * primitive type, an array class, or void. 2124 * 2125 * @return the array of {@code Class} objects representing all the 2126 * declared members of this class 2127 * @throws SecurityException 2128 * If a security manager, <i>s</i>, is present and any of the 2129 * following conditions is met: 2130 * 2131 * <ul> 2132 * 2133 * <li> the caller's class loader is not the same as the 2134 * class loader of this class and invocation of 2135 * {@link SecurityManager#checkPermission 2136 * s.checkPermission} method with 2137 * {@code RuntimePermission("accessDeclaredMembers")} 2138 * denies access to the declared classes within this class 2139 * 2140 * <li> the caller's class loader is not the same as or an 2141 * ancestor of the class loader for the current class and 2142 * invocation of {@link SecurityManager#checkPackageAccess 2143 * s.checkPackageAccess()} denies access to the package 2144 * of this class 2145 * 2146 * </ul> 2147 * 2148 * @since 1.1 2149 */ 2150 @CallerSensitive 2151 public Class<?>[] getDeclaredClasses() throws SecurityException { 2152 SecurityManager sm = System.getSecurityManager(); 2153 if (sm != null) { 2154 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), false); 2155 } 2156 return getDeclaredClasses0(); 2157 } 2158 2159 2160 /** 2161 * Returns an array of {@code Field} objects reflecting all the fields 2162 * declared by the class or interface represented by this 2163 * {@code Class} object. This includes public, protected, default 2164 * (package) access, and private fields, but excludes inherited fields. 2165 * 2166 * <p> If this {@code Class} object represents a class or interface with no 2167 * declared fields, then this method returns an array of length 0. 2168 * 2169 * <p> If this {@code Class} object represents an array type, a primitive 2170 * type, or void, then this method returns an array of length 0. 2171 * 2172 * <p> The elements in the returned array are not sorted and are not in any 2173 * particular order. 2174 * 2175 * @return the array of {@code Field} objects representing all the 2176 * declared fields of this class 2177 * @throws SecurityException 2178 * If a security manager, <i>s</i>, is present and any of the 2179 * following conditions is met: 2180 * 2181 * <ul> 2182 * 2183 * <li> the caller's class loader is not the same as the 2184 * class loader of this class and invocation of 2185 * {@link SecurityManager#checkPermission 2186 * s.checkPermission} method with 2187 * {@code RuntimePermission("accessDeclaredMembers")} 2188 * denies access to the declared fields within this class 2189 * 2190 * <li> the caller's class loader is not the same as or an 2191 * ancestor of the class loader for the current class and 2192 * invocation of {@link SecurityManager#checkPackageAccess 2193 * s.checkPackageAccess()} denies access to the package 2194 * of this class 2195 * 2196 * </ul> 2197 * 2198 * @since 1.1 2199 * @jls 8.2 Class Members 2200 * @jls 8.3 Field Declarations 2201 */ 2202 @CallerSensitive 2203 public Field[] getDeclaredFields() throws SecurityException { 2204 SecurityManager sm = System.getSecurityManager(); 2205 if (sm != null) { 2206 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true); 2207 } 2208 return copyFields(privateGetDeclaredFields(false)); 2209 } 2210 2211 2212 /** 2213 * Returns an array containing {@code Method} objects reflecting all the 2214 * declared methods of the class or interface represented by this {@code 2215 * Class} object, including public, protected, default (package) 2216 * access, and private methods, but excluding inherited methods. 2217 * 2218 * <p> If this {@code Class} object represents a type that has multiple 2219 * declared methods with the same name and parameter types, but different 2220 * return types, then the returned array has a {@code Method} object for 2221 * each such method. 2222 * 2223 * <p> If this {@code Class} object represents a type that has a class 2224 * initialization method {@code <clinit>}, then the returned array does 2225 * <em>not</em> have a corresponding {@code Method} object. 2226 * 2227 * <p> If this {@code Class} object represents a class or interface with no 2228 * declared methods, then the returned array has length 0. 2229 * 2230 * <p> If this {@code Class} object represents an array type, a primitive 2231 * type, or void, then the returned array has length 0. 2232 * 2233 * <p> The elements in the returned array are not sorted and are not in any 2234 * particular order. 2235 * 2236 * @return the array of {@code Method} objects representing all the 2237 * declared methods of this class 2238 * @throws SecurityException 2239 * If a security manager, <i>s</i>, is present and any of the 2240 * following conditions is met: 2241 * 2242 * <ul> 2243 * 2244 * <li> the caller's class loader is not the same as the 2245 * class loader of this class and invocation of 2246 * {@link SecurityManager#checkPermission 2247 * s.checkPermission} method with 2248 * {@code RuntimePermission("accessDeclaredMembers")} 2249 * denies access to the declared methods within this class 2250 * 2251 * <li> the caller's class loader is not the same as or an 2252 * ancestor of the class loader for the current class and 2253 * invocation of {@link SecurityManager#checkPackageAccess 2254 * s.checkPackageAccess()} denies access to the package 2255 * of this class 2256 * 2257 * </ul> 2258 * 2259 * @jls 8.2 Class Members 2260 * @jls 8.4 Method Declarations 2261 * @since 1.1 2262 */ 2263 @CallerSensitive 2264 public Method[] getDeclaredMethods() throws SecurityException { 2265 SecurityManager sm = System.getSecurityManager(); 2266 if (sm != null) { 2267 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true); 2268 } 2269 return copyMethods(privateGetDeclaredMethods(false)); 2270 } 2271 2272 2273 /** 2274 * Returns an array of {@code Constructor} objects reflecting all the 2275 * constructors declared by the class represented by this 2276 * {@code Class} object. These are public, protected, default 2277 * (package) access, and private constructors. The elements in the array 2278 * returned are not sorted and are not in any particular order. If the 2279 * class has a default constructor, it is included in the returned array. 2280 * This method returns an array of length 0 if this {@code Class} 2281 * object represents an interface, a primitive type, an array class, or 2282 * void. 2283 * 2284 * <p> See <em>The Java Language Specification</em>, section 8.2. 2285 * 2286 * @return the array of {@code Constructor} objects representing all the 2287 * declared constructors of this class 2288 * @throws SecurityException 2289 * If a security manager, <i>s</i>, is present and any of the 2290 * following conditions is met: 2291 * 2292 * <ul> 2293 * 2294 * <li> the caller's class loader is not the same as the 2295 * class loader of this class and invocation of 2296 * {@link SecurityManager#checkPermission 2297 * s.checkPermission} method with 2298 * {@code RuntimePermission("accessDeclaredMembers")} 2299 * denies access to the declared constructors within this class 2300 * 2301 * <li> the caller's class loader is not the same as or an 2302 * ancestor of the class loader for the current class and 2303 * invocation of {@link SecurityManager#checkPackageAccess 2304 * s.checkPackageAccess()} denies access to the package 2305 * of this class 2306 * 2307 * </ul> 2308 * 2309 * @since 1.1 2310 */ 2311 @CallerSensitive 2312 public Constructor<?>[] getDeclaredConstructors() throws SecurityException { 2313 SecurityManager sm = System.getSecurityManager(); 2314 if (sm != null) { 2315 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true); 2316 } 2317 return copyConstructors(privateGetDeclaredConstructors(false)); 2318 } 2319 2320 2321 /** 2322 * Returns a {@code Field} object that reflects the specified declared 2323 * field of the class or interface represented by this {@code Class} 2324 * object. The {@code name} parameter is a {@code String} that specifies 2325 * the simple name of the desired field. 2326 * 2327 * <p> If this {@code Class} object represents an array type, then this 2328 * method does not find the {@code length} field of the array type. 2329 * 2330 * @param name the name of the field 2331 * @return the {@code Field} object for the specified field in this 2332 * class 2333 * @throws NoSuchFieldException if a field with the specified name is 2334 * not found. 2335 * @throws NullPointerException if {@code name} is {@code null} 2336 * @throws SecurityException 2337 * If a security manager, <i>s</i>, is present and any of the 2338 * following conditions is met: 2339 * 2340 * <ul> 2341 * 2342 * <li> the caller's class loader is not the same as the 2343 * class loader of this class and invocation of 2344 * {@link SecurityManager#checkPermission 2345 * s.checkPermission} method with 2346 * {@code RuntimePermission("accessDeclaredMembers")} 2347 * denies access to the declared field 2348 * 2349 * <li> the caller's class loader is not the same as or an 2350 * ancestor of the class loader for the current class and 2351 * invocation of {@link SecurityManager#checkPackageAccess 2352 * s.checkPackageAccess()} denies access to the package 2353 * of this class 2354 * 2355 * </ul> 2356 * 2357 * @since 1.1 2358 * @jls 8.2 Class Members 2359 * @jls 8.3 Field Declarations 2360 */ 2361 @CallerSensitive 2362 public Field getDeclaredField(String name) 2363 throws NoSuchFieldException, SecurityException { 2364 Objects.requireNonNull(name); 2365 SecurityManager sm = System.getSecurityManager(); 2366 if (sm != null) { 2367 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true); 2368 } 2369 Field field = searchFields(privateGetDeclaredFields(false), name); 2370 if (field == null) { 2371 throw new NoSuchFieldException(name); 2372 } 2373 return getReflectionFactory().copyField(field); 2374 } 2375 2376 2377 /** 2378 * Returns a {@code Method} object that reflects the specified 2379 * declared method of the class or interface represented by this 2380 * {@code Class} object. The {@code name} parameter is a 2381 * {@code String} that specifies the simple name of the desired 2382 * method, and the {@code parameterTypes} parameter is an array of 2383 * {@code Class} objects that identify the method's formal parameter 2384 * types, in declared order. If more than one method with the same 2385 * parameter types is declared in a class, and one of these methods has a 2386 * return type that is more specific than any of the others, that method is 2387 * returned; otherwise one of the methods is chosen arbitrarily. If the 2388 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException} 2389 * is raised. 2390 * 2391 * <p> If this {@code Class} object represents an array type, then this 2392 * method does not find the {@code clone()} method. 2393 * 2394 * @param name the name of the method 2395 * @param parameterTypes the parameter array 2396 * @return the {@code Method} object for the method of this class 2397 * matching the specified name and parameters 2398 * @throws NoSuchMethodException if a matching method is not found. 2399 * @throws NullPointerException if {@code name} is {@code null} 2400 * @throws SecurityException 2401 * If a security manager, <i>s</i>, is present and any of the 2402 * following conditions is met: 2403 * 2404 * <ul> 2405 * 2406 * <li> the caller's class loader is not the same as the 2407 * class loader of this class and invocation of 2408 * {@link SecurityManager#checkPermission 2409 * s.checkPermission} method with 2410 * {@code RuntimePermission("accessDeclaredMembers")} 2411 * denies access to the declared method 2412 * 2413 * <li> the caller's class loader is not the same as or an 2414 * ancestor of the class loader for the current class and 2415 * invocation of {@link SecurityManager#checkPackageAccess 2416 * s.checkPackageAccess()} denies access to the package 2417 * of this class 2418 * 2419 * </ul> 2420 * 2421 * @jls 8.2 Class Members 2422 * @jls 8.4 Method Declarations 2423 * @since 1.1 2424 */ 2425 @CallerSensitive 2426 public Method getDeclaredMethod(String name, Class<?>... parameterTypes) 2427 throws NoSuchMethodException, SecurityException { 2428 Objects.requireNonNull(name); 2429 SecurityManager sm = System.getSecurityManager(); 2430 if (sm != null) { 2431 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true); 2432 } 2433 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes); 2434 if (method == null) { 2435 throw new NoSuchMethodException(methodToString(name, parameterTypes)); 2436 } 2437 return getReflectionFactory().copyMethod(method); 2438 } 2439 2440 /** 2441 * Returns the list of {@code Method} objects for the declared public 2442 * methods of this class or interface that have the specified method name 2443 * and parameter types. 2444 * 2445 * @param name the name of the method 2446 * @param parameterTypes the parameter array 2447 * @return the list of {@code Method} objects for the public methods of 2448 * this class matching the specified name and parameters 2449 */ 2450 List<Method> getDeclaredPublicMethods(String name, Class<?>... parameterTypes) { 2451 Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true); 2452 ReflectionFactory factory = getReflectionFactory(); 2453 List<Method> result = new ArrayList<>(); 2454 for (Method method : methods) { 2455 if (method.getName().equals(name) 2456 && Arrays.equals( 2457 factory.getExecutableSharedParameterTypes(method), 2458 parameterTypes)) { 2459 result.add(factory.copyMethod(method)); 2460 } 2461 } 2462 return result; 2463 } 2464 2465 /** 2466 * Returns a {@code Constructor} object that reflects the specified 2467 * constructor of the class or interface represented by this 2468 * {@code Class} object. The {@code parameterTypes} parameter is 2469 * an array of {@code Class} objects that identify the constructor's 2470 * formal parameter types, in declared order. 2471 * 2472 * If this {@code Class} object represents an inner class 2473 * declared in a non-static context, the formal parameter types 2474 * include the explicit enclosing instance as the first parameter. 2475 * 2476 * @param parameterTypes the parameter array 2477 * @return The {@code Constructor} object for the constructor with the 2478 * specified parameter list 2479 * @throws NoSuchMethodException if a matching method is not found. 2480 * @throws SecurityException 2481 * If a security manager, <i>s</i>, is present and any of the 2482 * following conditions is met: 2483 * 2484 * <ul> 2485 * 2486 * <li> the caller's class loader is not the same as the 2487 * class loader of this class and invocation of 2488 * {@link SecurityManager#checkPermission 2489 * s.checkPermission} method with 2490 * {@code RuntimePermission("accessDeclaredMembers")} 2491 * denies access to the declared constructor 2492 * 2493 * <li> the caller's class loader is not the same as or an 2494 * ancestor of the class loader for the current class and 2495 * invocation of {@link SecurityManager#checkPackageAccess 2496 * s.checkPackageAccess()} denies access to the package 2497 * of this class 2498 * 2499 * </ul> 2500 * 2501 * @since 1.1 2502 */ 2503 @CallerSensitive 2504 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes) 2505 throws NoSuchMethodException, SecurityException 2506 { 2507 SecurityManager sm = System.getSecurityManager(); 2508 if (sm != null) { 2509 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true); 2510 } 2511 2512 return getReflectionFactory().copyConstructor( 2513 getConstructor0(parameterTypes, Member.DECLARED)); 2514 } 2515 2516 /** 2517 * Finds a resource with a given name. 2518 * 2519 * <p> If this class is in a named {@link Module Module} then this method 2520 * will attempt to find the resource in the module. This is done by 2521 * delegating to the module's class loader {@link 2522 * ClassLoader#findResource(String,String) findResource(String,String)} 2523 * method, invoking it with the module name and the absolute name of the 2524 * resource. Resources in named modules are subject to the rules for 2525 * encapsulation specified in the {@code Module} {@link 2526 * Module#getResourceAsStream getResourceAsStream} method and so this 2527 * method returns {@code null} when the resource is a 2528 * non-"{@code .class}" resource in a package that is not open to the 2529 * caller's module. 2530 * 2531 * <p> Otherwise, if this class is not in a named module then the rules for 2532 * searching resources associated with a given class are implemented by the 2533 * defining {@linkplain ClassLoader class loader} of the class. This method 2534 * delegates to this object's class loader. If this object was loaded by 2535 * the bootstrap class loader, the method delegates to {@link 2536 * ClassLoader#getSystemResourceAsStream}. 2537 * 2538 * <p> Before delegation, an absolute resource name is constructed from the 2539 * given resource name using this algorithm: 2540 * 2541 * <ul> 2542 * 2543 * <li> If the {@code name} begins with a {@code '/'} 2544 * (<code>'\u002f'</code>), then the absolute name of the resource is the 2545 * portion of the {@code name} following the {@code '/'}. 2546 * 2547 * <li> Otherwise, the absolute name is of the following form: 2548 * 2549 * <blockquote> 2550 * {@code modified_package_name/name} 2551 * </blockquote> 2552 * 2553 * <p> Where the {@code modified_package_name} is the package name of this 2554 * object with {@code '/'} substituted for {@code '.'} 2555 * (<code>'\u002e'</code>). 2556 * 2557 * </ul> 2558 * 2559 * @param name name of the desired resource 2560 * @return A {@link java.io.InputStream} object; {@code null} if no 2561 * resource with this name is found, the resource is in a package 2562 * that is not {@link Module#isOpen(String, Module) open} to at 2563 * least the caller module, or access to the resource is denied 2564 * by the security manager. 2565 * @throws NullPointerException If {@code name} is {@code null} 2566 * 2567 * @see Module#getResourceAsStream(String) 2568 * @since 1.1 2569 * @revised 9 2570 * @spec JPMS 2571 */ 2572 @CallerSensitive 2573 public InputStream getResourceAsStream(String name) { 2574 name = resolveName(name); 2575 2576 Module thisModule = getModule(); 2577 if (thisModule.isNamed()) { 2578 // check if resource can be located by caller 2579 if (Resources.canEncapsulate(name) 2580 && !isOpenToCaller(name, Reflection.getCallerClass())) { 2581 return null; 2582 } 2583 2584 // resource not encapsulated or in package open to caller 2585 String mn = thisModule.getName(); 2586 ClassLoader cl = getClassLoader0(); 2587 try { 2588 2589 // special-case built-in class loaders to avoid the 2590 // need for a URL connection 2591 if (cl == null) { 2592 return BootLoader.findResourceAsStream(mn, name); 2593 } else if (cl instanceof BuiltinClassLoader) { 2594 return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name); 2595 } else { 2596 URL url = cl.findResource(mn, name); 2597 return (url != null) ? url.openStream() : null; 2598 } 2599 2600 } catch (IOException | SecurityException e) { 2601 return null; 2602 } 2603 } 2604 2605 // unnamed module 2606 ClassLoader cl = getClassLoader0(); 2607 if (cl == null) { 2608 return ClassLoader.getSystemResourceAsStream(name); 2609 } else { 2610 return cl.getResourceAsStream(name); 2611 } 2612 } 2613 2614 /** 2615 * Finds a resource with a given name. 2616 * 2617 * <p> If this class is in a named {@link Module Module} then this method 2618 * will attempt to find the resource in the module. This is done by 2619 * delegating to the module's class loader {@link 2620 * ClassLoader#findResource(String,String) findResource(String,String)} 2621 * method, invoking it with the module name and the absolute name of the 2622 * resource. Resources in named modules are subject to the rules for 2623 * encapsulation specified in the {@code Module} {@link 2624 * Module#getResourceAsStream getResourceAsStream} method and so this 2625 * method returns {@code null} when the resource is a 2626 * non-"{@code .class}" resource in a package that is not open to the 2627 * caller's module. 2628 * 2629 * <p> Otherwise, if this class is not in a named module then the rules for 2630 * searching resources associated with a given class are implemented by the 2631 * defining {@linkplain ClassLoader class loader} of the class. This method 2632 * delegates to this object's class loader. If this object was loaded by 2633 * the bootstrap class loader, the method delegates to {@link 2634 * ClassLoader#getSystemResource}. 2635 * 2636 * <p> Before delegation, an absolute resource name is constructed from the 2637 * given resource name using this algorithm: 2638 * 2639 * <ul> 2640 * 2641 * <li> If the {@code name} begins with a {@code '/'} 2642 * (<code>'\u002f'</code>), then the absolute name of the resource is the 2643 * portion of the {@code name} following the {@code '/'}. 2644 * 2645 * <li> Otherwise, the absolute name is of the following form: 2646 * 2647 * <blockquote> 2648 * {@code modified_package_name/name} 2649 * </blockquote> 2650 * 2651 * <p> Where the {@code modified_package_name} is the package name of this 2652 * object with {@code '/'} substituted for {@code '.'} 2653 * (<code>'\u002e'</code>). 2654 * 2655 * </ul> 2656 * 2657 * @param name name of the desired resource 2658 * @return A {@link java.net.URL} object; {@code null} if no resource with 2659 * this name is found, the resource cannot be located by a URL, the 2660 * resource is in a package that is not 2661 * {@link Module#isOpen(String, Module) open} to at least the caller 2662 * module, or access to the resource is denied by the security 2663 * manager. 2664 * @throws NullPointerException If {@code name} is {@code null} 2665 * @since 1.1 2666 * @revised 9 2667 * @spec JPMS 2668 */ 2669 @CallerSensitive 2670 public URL getResource(String name) { 2671 name = resolveName(name); 2672 2673 Module thisModule = getModule(); 2674 if (thisModule.isNamed()) { 2675 // check if resource can be located by caller 2676 if (Resources.canEncapsulate(name) 2677 && !isOpenToCaller(name, Reflection.getCallerClass())) { 2678 return null; 2679 } 2680 2681 // resource not encapsulated or in package open to caller 2682 String mn = thisModule.getName(); 2683 ClassLoader cl = getClassLoader0(); 2684 try { 2685 if (cl == null) { 2686 return BootLoader.findResource(mn, name); 2687 } else { 2688 return cl.findResource(mn, name); 2689 } 2690 } catch (IOException ioe) { 2691 return null; 2692 } 2693 } 2694 2695 // unnamed module 2696 ClassLoader cl = getClassLoader0(); 2697 if (cl == null) { 2698 return ClassLoader.getSystemResource(name); 2699 } else { 2700 return cl.getResource(name); 2701 } 2702 } 2703 2704 /** 2705 * Returns true if a resource with the given name can be located by the 2706 * given caller. All resources in a module can be located by code in 2707 * the module. For other callers, then the package needs to be open to 2708 * the caller. 2709 */ 2710 private boolean isOpenToCaller(String name, Class<?> caller) { 2711 // assert getModule().isNamed(); 2712 Module thisModule = getModule(); 2713 Module callerModule = (caller != null) ? caller.getModule() : null; 2714 if (callerModule != thisModule) { 2715 String pn = Resources.toPackageName(name); 2716 if (thisModule.getDescriptor().packages().contains(pn)) { 2717 if (callerModule == null && !thisModule.isOpen(pn)) { 2718 // no caller, package not open 2719 return false; 2720 } 2721 if (!thisModule.isOpen(pn, callerModule)) { 2722 // package not open to caller 2723 return false; 2724 } 2725 } 2726 } 2727 return true; 2728 } 2729 2730 2731 /** protection domain returned when the internal domain is null */ 2732 private static java.security.ProtectionDomain allPermDomain; 2733 2734 /** 2735 * Returns the {@code ProtectionDomain} of this class. If there is a 2736 * security manager installed, this method first calls the security 2737 * manager's {@code checkPermission} method with a 2738 * {@code RuntimePermission("getProtectionDomain")} permission to 2739 * ensure it's ok to get the 2740 * {@code ProtectionDomain}. 2741 * 2742 * @return the ProtectionDomain of this class 2743 * 2744 * @throws SecurityException 2745 * if a security manager exists and its 2746 * {@code checkPermission} method doesn't allow 2747 * getting the ProtectionDomain. 2748 * 2749 * @see java.security.ProtectionDomain 2750 * @see SecurityManager#checkPermission 2751 * @see java.lang.RuntimePermission 2752 * @since 1.2 2753 */ 2754 public java.security.ProtectionDomain getProtectionDomain() { 2755 SecurityManager sm = System.getSecurityManager(); 2756 if (sm != null) { 2757 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION); 2758 } 2759 java.security.ProtectionDomain pd = getProtectionDomain0(); 2760 if (pd == null) { 2761 if (allPermDomain == null) { 2762 java.security.Permissions perms = 2763 new java.security.Permissions(); 2764 perms.add(SecurityConstants.ALL_PERMISSION); 2765 allPermDomain = 2766 new java.security.ProtectionDomain(null, perms); 2767 } 2768 pd = allPermDomain; 2769 } 2770 return pd; 2771 } 2772 2773 2774 /** 2775 * Returns the ProtectionDomain of this class. 2776 */ 2777 private native java.security.ProtectionDomain getProtectionDomain0(); 2778 2779 /* 2780 * Return the Virtual Machine's Class object for the named 2781 * primitive type. 2782 */ 2783 static native Class<?> getPrimitiveClass(String name); 2784 2785 /* 2786 * Check if client is allowed to access members. If access is denied, 2787 * throw a SecurityException. 2788 * 2789 * This method also enforces package access. 2790 * 2791 * <p> Default policy: allow all clients access with normal Java access 2792 * control. 2793 * 2794 * <p> NOTE: should only be called if a SecurityManager is installed 2795 */ 2796 private void checkMemberAccess(SecurityManager sm, int which, 2797 Class<?> caller, boolean checkProxyInterfaces) { 2798 /* Default policy allows access to all {@link Member#PUBLIC} members, 2799 * as well as access to classes that have the same class loader as the caller. 2800 * In all other cases, it requires RuntimePermission("accessDeclaredMembers") 2801 * permission. 2802 */ 2803 final ClassLoader ccl = ClassLoader.getClassLoader(caller); 2804 if (which != Member.PUBLIC) { 2805 final ClassLoader cl = getClassLoader0(); 2806 if (ccl != cl) { 2807 sm.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION); 2808 } 2809 } 2810 this.checkPackageAccess(sm, ccl, checkProxyInterfaces); 2811 } 2812 2813 /* 2814 * Checks if a client loaded in ClassLoader ccl is allowed to access this 2815 * class under the current package access policy. If access is denied, 2816 * throw a SecurityException. 2817 * 2818 * NOTE: this method should only be called if a SecurityManager is active 2819 */ 2820 private void checkPackageAccess(SecurityManager sm, final ClassLoader ccl, 2821 boolean checkProxyInterfaces) { 2822 final ClassLoader cl = getClassLoader0(); 2823 2824 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) { 2825 String pkg = this.getPackageName(); 2826 if (pkg != null && !pkg.isEmpty()) { 2827 // skip the package access check on a proxy class in default proxy package 2828 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) { 2829 sm.checkPackageAccess(pkg); 2830 } 2831 } 2832 } 2833 // check package access on the proxy interfaces 2834 if (checkProxyInterfaces && Proxy.isProxyClass(this)) { 2835 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces()); 2836 } 2837 } 2838 2839 /** 2840 * Add a package name prefix if the name is not absolute Remove leading "/" 2841 * if name is absolute 2842 */ 2843 private String resolveName(String name) { 2844 if (!name.startsWith("/")) { 2845 Class<?> c = this; 2846 while (c.isArray()) { 2847 c = c.getComponentType(); 2848 } 2849 String baseName = c.getPackageName(); 2850 if (baseName != null && !baseName.isEmpty()) { 2851 name = baseName.replace('.', '/') + "/" + name; 2852 } 2853 } else { 2854 name = name.substring(1); 2855 } 2856 return name; 2857 } 2858 2859 /** 2860 * Atomic operations support. 2861 */ 2862 private static class Atomic { 2863 // initialize Unsafe machinery here, since we need to call Class.class instance method 2864 // and have to avoid calling it in the static initializer of the Class class... 2865 private static final Unsafe unsafe = Unsafe.getUnsafe(); 2866 // offset of Class.reflectionData instance field 2867 private static final long reflectionDataOffset 2868 = unsafe.objectFieldOffset(Class.class, "reflectionData"); 2869 // offset of Class.annotationType instance field 2870 private static final long annotationTypeOffset 2871 = unsafe.objectFieldOffset(Class.class, "annotationType"); 2872 // offset of Class.annotationData instance field 2873 private static final long annotationDataOffset 2874 = unsafe.objectFieldOffset(Class.class, "annotationData"); 2875 2876 static <T> boolean casReflectionData(Class<?> clazz, 2877 SoftReference<ReflectionData<T>> oldData, 2878 SoftReference<ReflectionData<T>> newData) { 2879 return unsafe.compareAndSetObject(clazz, reflectionDataOffset, oldData, newData); 2880 } 2881 2882 static <T> boolean casAnnotationType(Class<?> clazz, 2883 AnnotationType oldType, 2884 AnnotationType newType) { 2885 return unsafe.compareAndSetObject(clazz, annotationTypeOffset, oldType, newType); 2886 } 2887 2888 static <T> boolean casAnnotationData(Class<?> clazz, 2889 AnnotationData oldData, 2890 AnnotationData newData) { 2891 return unsafe.compareAndSetObject(clazz, annotationDataOffset, oldData, newData); 2892 } 2893 } 2894 2895 /** 2896 * Reflection support. 2897 */ 2898 2899 // reflection data that might get invalidated when JVM TI RedefineClasses() is called 2900 private static class ReflectionData<T> { 2901 volatile Field[] declaredFields; 2902 volatile Field[] publicFields; 2903 volatile Method[] declaredMethods; 2904 volatile Method[] publicMethods; 2905 volatile Constructor<T>[] declaredConstructors; 2906 volatile Constructor<T>[] publicConstructors; 2907 // Intermediate results for getFields and getMethods 2908 volatile Field[] declaredPublicFields; 2909 volatile Method[] declaredPublicMethods; 2910 volatile Class<?>[] interfaces; 2911 2912 // Value of classRedefinedCount when we created this ReflectionData instance 2913 final int redefinedCount; 2914 2915 ReflectionData(int redefinedCount) { 2916 this.redefinedCount = redefinedCount; 2917 } 2918 } 2919 2920 private transient volatile SoftReference<ReflectionData<T>> reflectionData; 2921 2922 // Incremented by the VM on each call to JVM TI RedefineClasses() 2923 // that redefines this class or a superclass. 2924 private transient volatile int classRedefinedCount; 2925 2926 // Lazily create and cache ReflectionData 2927 private ReflectionData<T> reflectionData() { 2928 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData; 2929 int classRedefinedCount = this.classRedefinedCount; 2930 ReflectionData<T> rd; 2931 if (reflectionData != null && 2932 (rd = reflectionData.get()) != null && 2933 rd.redefinedCount == classRedefinedCount) { 2934 return rd; 2935 } 2936 // else no SoftReference or cleared SoftReference or stale ReflectionData 2937 // -> create and replace new instance 2938 return newReflectionData(reflectionData, classRedefinedCount); 2939 } 2940 2941 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData, 2942 int classRedefinedCount) { 2943 while (true) { 2944 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount); 2945 // try to CAS it... 2946 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) { 2947 return rd; 2948 } 2949 // else retry 2950 oldReflectionData = this.reflectionData; 2951 classRedefinedCount = this.classRedefinedCount; 2952 if (oldReflectionData != null && 2953 (rd = oldReflectionData.get()) != null && 2954 rd.redefinedCount == classRedefinedCount) { 2955 return rd; 2956 } 2957 } 2958 } 2959 2960 // Generic signature handling 2961 private native String getGenericSignature0(); 2962 2963 // Generic info repository; lazily initialized 2964 private transient volatile ClassRepository genericInfo; 2965 2966 // accessor for factory 2967 private GenericsFactory getFactory() { 2968 // create scope and factory 2969 return CoreReflectionFactory.make(this, ClassScope.make(this)); 2970 } 2971 2972 // accessor for generic info repository; 2973 // generic info is lazily initialized 2974 private ClassRepository getGenericInfo() { 2975 ClassRepository genericInfo = this.genericInfo; 2976 if (genericInfo == null) { 2977 String signature = getGenericSignature0(); 2978 if (signature == null) { 2979 genericInfo = ClassRepository.NONE; 2980 } else { 2981 genericInfo = ClassRepository.make(signature, getFactory()); 2982 } 2983 this.genericInfo = genericInfo; 2984 } 2985 return (genericInfo != ClassRepository.NONE) ? genericInfo : null; 2986 } 2987 2988 // Annotations handling 2989 native byte[] getRawAnnotations(); 2990 // Since 1.8 2991 native byte[] getRawTypeAnnotations(); 2992 static byte[] getExecutableTypeAnnotationBytes(Executable ex) { 2993 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex); 2994 } 2995 2996 native ConstantPool getConstantPool(); 2997 2998 // 2999 // 3000 // java.lang.reflect.Field handling 3001 // 3002 // 3003 3004 // Returns an array of "root" fields. These Field objects must NOT 3005 // be propagated to the outside world, but must instead be copied 3006 // via ReflectionFactory.copyField. 3007 private Field[] privateGetDeclaredFields(boolean publicOnly) { 3008 Field[] res; 3009 ReflectionData<T> rd = reflectionData(); 3010 if (rd != null) { 3011 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields; 3012 if (res != null) return res; 3013 } 3014 // No cached value available; request value from VM 3015 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly)); 3016 if (rd != null) { 3017 if (publicOnly) { 3018 rd.declaredPublicFields = res; 3019 } else { 3020 rd.declaredFields = res; 3021 } 3022 } 3023 return res; 3024 } 3025 3026 // Returns an array of "root" fields. These Field objects must NOT 3027 // be propagated to the outside world, but must instead be copied 3028 // via ReflectionFactory.copyField. 3029 private Field[] privateGetPublicFields(Set<Class<?>> traversedInterfaces) { 3030 Field[] res; 3031 ReflectionData<T> rd = reflectionData(); 3032 if (rd != null) { 3033 res = rd.publicFields; 3034 if (res != null) return res; 3035 } 3036 3037 // No cached value available; compute value recursively. 3038 // Traverse in correct order for getField(). 3039 List<Field> fields = new ArrayList<>(); 3040 if (traversedInterfaces == null) { 3041 traversedInterfaces = new HashSet<>(); 3042 } 3043 3044 // Local fields 3045 Field[] tmp = privateGetDeclaredFields(true); 3046 addAll(fields, tmp); 3047 3048 // Direct superinterfaces, recursively 3049 for (Class<?> c : getInterfaces()) { 3050 if (!traversedInterfaces.contains(c)) { 3051 traversedInterfaces.add(c); 3052 addAll(fields, c.privateGetPublicFields(traversedInterfaces)); 3053 } 3054 } 3055 3056 // Direct superclass, recursively 3057 if (!isInterface()) { 3058 Class<?> c = getSuperclass(); 3059 if (c != null) { 3060 addAll(fields, c.privateGetPublicFields(traversedInterfaces)); 3061 } 3062 } 3063 3064 res = new Field[fields.size()]; 3065 fields.toArray(res); 3066 if (rd != null) { 3067 rd.publicFields = res; 3068 } 3069 return res; 3070 } 3071 3072 private static void addAll(Collection<Field> c, Field[] o) { 3073 for (Field f : o) { 3074 c.add(f); 3075 } 3076 } 3077 3078 3079 // 3080 // 3081 // java.lang.reflect.Constructor handling 3082 // 3083 // 3084 3085 // Returns an array of "root" constructors. These Constructor 3086 // objects must NOT be propagated to the outside world, but must 3087 // instead be copied via ReflectionFactory.copyConstructor. 3088 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) { 3089 Constructor<T>[] res; 3090 ReflectionData<T> rd = reflectionData(); 3091 if (rd != null) { 3092 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors; 3093 if (res != null) return res; 3094 } 3095 // No cached value available; request value from VM 3096 if (isInterface()) { 3097 @SuppressWarnings("unchecked") 3098 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0]; 3099 res = temporaryRes; 3100 } else { 3101 res = getDeclaredConstructors0(publicOnly); 3102 } 3103 if (rd != null) { 3104 if (publicOnly) { 3105 rd.publicConstructors = res; 3106 } else { 3107 rd.declaredConstructors = res; 3108 } 3109 } 3110 return res; 3111 } 3112 3113 // 3114 // 3115 // java.lang.reflect.Method handling 3116 // 3117 // 3118 3119 // Returns an array of "root" methods. These Method objects must NOT 3120 // be propagated to the outside world, but must instead be copied 3121 // via ReflectionFactory.copyMethod. 3122 private Method[] privateGetDeclaredMethods(boolean publicOnly) { 3123 Method[] res; 3124 ReflectionData<T> rd = reflectionData(); 3125 if (rd != null) { 3126 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods; 3127 if (res != null) return res; 3128 } 3129 // No cached value available; request value from VM 3130 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly)); 3131 if (rd != null) { 3132 if (publicOnly) { 3133 rd.declaredPublicMethods = res; 3134 } else { 3135 rd.declaredMethods = res; 3136 } 3137 } 3138 return res; 3139 } 3140 3141 // Returns an array of "root" methods. These Method objects must NOT 3142 // be propagated to the outside world, but must instead be copied 3143 // via ReflectionFactory.copyMethod. 3144 private Method[] privateGetPublicMethods() { 3145 Method[] res; 3146 ReflectionData<T> rd = reflectionData(); 3147 if (rd != null) { 3148 res = rd.publicMethods; 3149 if (res != null) return res; 3150 } 3151 3152 // No cached value available; compute value recursively. 3153 // Start by fetching public declared methods... 3154 PublicMethods pms = new PublicMethods(); 3155 for (Method m : privateGetDeclaredMethods(/* publicOnly */ true)) { 3156 pms.merge(m); 3157 } 3158 // ...then recur over superclass methods... 3159 Class<?> sc = getSuperclass(); 3160 if (sc != null) { 3161 for (Method m : sc.privateGetPublicMethods()) { 3162 pms.merge(m); 3163 } 3164 } 3165 // ...and finally over direct superinterfaces. 3166 for (Class<?> intf : getInterfaces(/* cloneArray */ false)) { 3167 for (Method m : intf.privateGetPublicMethods()) { 3168 // static interface methods are not inherited 3169 if (!Modifier.isStatic(m.getModifiers())) { 3170 pms.merge(m); 3171 } 3172 } 3173 } 3174 3175 res = pms.toArray(); 3176 if (rd != null) { 3177 rd.publicMethods = res; 3178 } 3179 return res; 3180 } 3181 3182 3183 // 3184 // Helpers for fetchers of one field, method, or constructor 3185 // 3186 3187 // This method does not copy the returned Field object! 3188 private static Field searchFields(Field[] fields, String name) { 3189 for (Field field : fields) { 3190 if (field.getName().equals(name)) { 3191 return field; 3192 } 3193 } 3194 return null; 3195 } 3196 3197 // Returns a "root" Field object. This Field object must NOT 3198 // be propagated to the outside world, but must instead be copied 3199 // via ReflectionFactory.copyField. 3200 private Field getField0(String name) { 3201 // Note: the intent is that the search algorithm this routine 3202 // uses be equivalent to the ordering imposed by 3203 // privateGetPublicFields(). It fetches only the declared 3204 // public fields for each class, however, to reduce the number 3205 // of Field objects which have to be created for the common 3206 // case where the field being requested is declared in the 3207 // class which is being queried. 3208 Field res; 3209 // Search declared public fields 3210 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) { 3211 return res; 3212 } 3213 // Direct superinterfaces, recursively 3214 Class<?>[] interfaces = getInterfaces(/* cloneArray */ false); 3215 for (Class<?> c : interfaces) { 3216 if ((res = c.getField0(name)) != null) { 3217 return res; 3218 } 3219 } 3220 // Direct superclass, recursively 3221 if (!isInterface()) { 3222 Class<?> c = getSuperclass(); 3223 if (c != null) { 3224 if ((res = c.getField0(name)) != null) { 3225 return res; 3226 } 3227 } 3228 } 3229 return null; 3230 } 3231 3232 // This method does not copy the returned Method object! 3233 private static Method searchMethods(Method[] methods, 3234 String name, 3235 Class<?>[] parameterTypes) 3236 { 3237 ReflectionFactory fact = getReflectionFactory(); 3238 Method res = null; 3239 for (Method m : methods) { 3240 if (m.getName().equals(name) 3241 && arrayContentsEq(parameterTypes, 3242 fact.getExecutableSharedParameterTypes(m)) 3243 && (res == null 3244 || (res.getReturnType() != m.getReturnType() 3245 && res.getReturnType().isAssignableFrom(m.getReturnType())))) 3246 res = m; 3247 } 3248 return res; 3249 } 3250 3251 private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0]; 3252 3253 // Returns a "root" Method object. This Method object must NOT 3254 // be propagated to the outside world, but must instead be copied 3255 // via ReflectionFactory.copyMethod. 3256 private Method getMethod0(String name, Class<?>[] parameterTypes) { 3257 PublicMethods.MethodList res = getMethodsRecursive( 3258 name, 3259 parameterTypes == null ? EMPTY_CLASS_ARRAY : parameterTypes, 3260 /* includeStatic */ true); 3261 return res == null ? null : res.getMostSpecific(); 3262 } 3263 3264 // Returns a list of "root" Method objects. These Method objects must NOT 3265 // be propagated to the outside world, but must instead be copied 3266 // via ReflectionFactory.copyMethod. 3267 private PublicMethods.MethodList getMethodsRecursive(String name, 3268 Class<?>[] parameterTypes, 3269 boolean includeStatic) { 3270 // 1st check declared public methods 3271 Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true); 3272 PublicMethods.MethodList res = PublicMethods.MethodList 3273 .filter(methods, name, parameterTypes, includeStatic); 3274 // if there is at least one match among declared methods, we need not 3275 // search any further as such match surely overrides matching methods 3276 // declared in superclass(es) or interface(s). 3277 if (res != null) { 3278 return res; 3279 } 3280 3281 // if there was no match among declared methods, 3282 // we must consult the superclass (if any) recursively... 3283 Class<?> sc = getSuperclass(); 3284 if (sc != null) { 3285 res = sc.getMethodsRecursive(name, parameterTypes, includeStatic); 3286 } 3287 3288 // ...and coalesce the superclass methods with methods obtained 3289 // from directly implemented interfaces excluding static methods... 3290 for (Class<?> intf : getInterfaces(/* cloneArray */ false)) { 3291 res = PublicMethods.MethodList.merge( 3292 res, intf.getMethodsRecursive(name, parameterTypes, 3293 /* includeStatic */ false)); 3294 } 3295 3296 return res; 3297 } 3298 3299 // Returns a "root" Constructor object. This Constructor object must NOT 3300 // be propagated to the outside world, but must instead be copied 3301 // via ReflectionFactory.copyConstructor. 3302 private Constructor<T> getConstructor0(Class<?>[] parameterTypes, 3303 int which) throws NoSuchMethodException 3304 { 3305 ReflectionFactory fact = getReflectionFactory(); 3306 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC)); 3307 for (Constructor<T> constructor : constructors) { 3308 if (arrayContentsEq(parameterTypes, 3309 fact.getExecutableSharedParameterTypes(constructor))) { 3310 return constructor; 3311 } 3312 } 3313 throw new NoSuchMethodException(methodToString("<init>", parameterTypes)); 3314 } 3315 3316 // 3317 // Other helpers and base implementation 3318 // 3319 3320 private static boolean arrayContentsEq(Object[] a1, Object[] a2) { 3321 if (a1 == null) { 3322 return a2 == null || a2.length == 0; 3323 } 3324 3325 if (a2 == null) { 3326 return a1.length == 0; 3327 } 3328 3329 if (a1.length != a2.length) { 3330 return false; 3331 } 3332 3333 for (int i = 0; i < a1.length; i++) { 3334 if (a1[i] != a2[i]) { 3335 return false; 3336 } 3337 } 3338 3339 return true; 3340 } 3341 3342 private static Field[] copyFields(Field[] arg) { 3343 Field[] out = new Field[arg.length]; 3344 ReflectionFactory fact = getReflectionFactory(); 3345 for (int i = 0; i < arg.length; i++) { 3346 out[i] = fact.copyField(arg[i]); 3347 } 3348 return out; 3349 } 3350 3351 private static Method[] copyMethods(Method[] arg) { 3352 Method[] out = new Method[arg.length]; 3353 ReflectionFactory fact = getReflectionFactory(); 3354 for (int i = 0; i < arg.length; i++) { 3355 out[i] = fact.copyMethod(arg[i]); 3356 } 3357 return out; 3358 } 3359 3360 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) { 3361 Constructor<U>[] out = arg.clone(); 3362 ReflectionFactory fact = getReflectionFactory(); 3363 for (int i = 0; i < out.length; i++) { 3364 out[i] = fact.copyConstructor(out[i]); 3365 } 3366 return out; 3367 } 3368 3369 private native Field[] getDeclaredFields0(boolean publicOnly); 3370 private native Method[] getDeclaredMethods0(boolean publicOnly); 3371 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly); 3372 private native Class<?>[] getDeclaredClasses0(); 3373 3374 /** 3375 * Helper method to get the method name from arguments. 3376 */ 3377 private String methodToString(String name, Class<?>[] argTypes) { 3378 StringJoiner sj = new StringJoiner(", ", getName() + "." + name + "(", ")"); 3379 if (argTypes != null) { 3380 for (int i = 0; i < argTypes.length; i++) { 3381 Class<?> c = argTypes[i]; 3382 sj.add((c == null) ? "null" : c.getName()); 3383 } 3384 } 3385 return sj.toString(); 3386 } 3387 3388 /** use serialVersionUID from JDK 1.1 for interoperability */ 3389 private static final long serialVersionUID = 3206093459760846163L; 3390 3391 3392 /** 3393 * Class Class is special cased within the Serialization Stream Protocol. 3394 * 3395 * A Class instance is written initially into an ObjectOutputStream in the 3396 * following format: 3397 * <pre> 3398 * {@code TC_CLASS} ClassDescriptor 3399 * A ClassDescriptor is a special cased serialization of 3400 * a {@code java.io.ObjectStreamClass} instance. 3401 * </pre> 3402 * A new handle is generated for the initial time the class descriptor 3403 * is written into the stream. Future references to the class descriptor 3404 * are written as references to the initial class descriptor instance. 3405 * 3406 * @see java.io.ObjectStreamClass 3407 */ 3408 private static final ObjectStreamField[] serialPersistentFields = 3409 new ObjectStreamField[0]; 3410 3411 3412 /** 3413 * Returns the assertion status that would be assigned to this 3414 * class if it were to be initialized at the time this method is invoked. 3415 * If this class has had its assertion status set, the most recent 3416 * setting will be returned; otherwise, if any package default assertion 3417 * status pertains to this class, the most recent setting for the most 3418 * specific pertinent package default assertion status is returned; 3419 * otherwise, if this class is not a system class (i.e., it has a 3420 * class loader) its class loader's default assertion status is returned; 3421 * otherwise, the system class default assertion status is returned. 3422 * <p> 3423 * Few programmers will have any need for this method; it is provided 3424 * for the benefit of the JRE itself. (It allows a class to determine at 3425 * the time that it is initialized whether assertions should be enabled.) 3426 * Note that this method is not guaranteed to return the actual 3427 * assertion status that was (or will be) associated with the specified 3428 * class when it was (or will be) initialized. 3429 * 3430 * @return the desired assertion status of the specified class. 3431 * @see java.lang.ClassLoader#setClassAssertionStatus 3432 * @see java.lang.ClassLoader#setPackageAssertionStatus 3433 * @see java.lang.ClassLoader#setDefaultAssertionStatus 3434 * @since 1.4 3435 */ 3436 public boolean desiredAssertionStatus() { 3437 ClassLoader loader = getClassLoader0(); 3438 // If the loader is null this is a system class, so ask the VM 3439 if (loader == null) 3440 return desiredAssertionStatus0(this); 3441 3442 // If the classloader has been initialized with the assertion 3443 // directives, ask it. Otherwise, ask the VM. 3444 synchronized(loader.assertionLock) { 3445 if (loader.classAssertionStatus != null) { 3446 return loader.desiredAssertionStatus(getName()); 3447 } 3448 } 3449 return desiredAssertionStatus0(this); 3450 } 3451 3452 // Retrieves the desired assertion status of this class from the VM 3453 private static native boolean desiredAssertionStatus0(Class<?> clazz); 3454 3455 /** 3456 * Returns true if and only if this class was declared as an enum in the 3457 * source code. 3458 * 3459 * @return true if and only if this class was declared as an enum in the 3460 * source code 3461 * @since 1.5 3462 */ 3463 public boolean isEnum() { 3464 // An enum must both directly extend java.lang.Enum and have 3465 // the ENUM bit set; classes for specialized enum constants 3466 // don't do the former. 3467 return (this.getModifiers() & ENUM) != 0 && 3468 this.getSuperclass() == java.lang.Enum.class; 3469 } 3470 3471 // Fetches the factory for reflective objects 3472 private static ReflectionFactory getReflectionFactory() { 3473 if (reflectionFactory == null) { 3474 reflectionFactory = 3475 java.security.AccessController.doPrivileged 3476 (new ReflectionFactory.GetReflectionFactoryAction()); 3477 } 3478 return reflectionFactory; 3479 } 3480 private static ReflectionFactory reflectionFactory; 3481 3482 /** 3483 * Returns the elements of this enum class or null if this 3484 * Class object does not represent an enum type. 3485 * 3486 * @return an array containing the values comprising the enum class 3487 * represented by this Class object in the order they're 3488 * declared, or null if this Class object does not 3489 * represent an enum type 3490 * @since 1.5 3491 */ 3492 public T[] getEnumConstants() { 3493 T[] values = getEnumConstantsShared(); 3494 return (values != null) ? values.clone() : null; 3495 } 3496 3497 /** 3498 * Returns the elements of this enum class or null if this 3499 * Class object does not represent an enum type; 3500 * identical to getEnumConstants except that the result is 3501 * uncloned, cached, and shared by all callers. 3502 */ 3503 T[] getEnumConstantsShared() { 3504 T[] constants = enumConstants; 3505 if (constants == null) { 3506 if (!isEnum()) return null; 3507 try { 3508 final Method values = getMethod("values"); 3509 java.security.AccessController.doPrivileged( 3510 new java.security.PrivilegedAction<>() { 3511 public Void run() { 3512 values.setAccessible(true); 3513 return null; 3514 } 3515 }); 3516 @SuppressWarnings("unchecked") 3517 T[] temporaryConstants = (T[])values.invoke(null); 3518 enumConstants = constants = temporaryConstants; 3519 } 3520 // These can happen when users concoct enum-like classes 3521 // that don't comply with the enum spec. 3522 catch (InvocationTargetException | NoSuchMethodException | 3523 IllegalAccessException ex) { return null; } 3524 } 3525 return constants; 3526 } 3527 private transient volatile T[] enumConstants; 3528 3529 /** 3530 * Returns a map from simple name to enum constant. This package-private 3531 * method is used internally by Enum to implement 3532 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)} 3533 * efficiently. Note that the map is returned by this method is 3534 * created lazily on first use. Typically it won't ever get created. 3535 */ 3536 Map<String, T> enumConstantDirectory() { 3537 Map<String, T> directory = enumConstantDirectory; 3538 if (directory == null) { 3539 T[] universe = getEnumConstantsShared(); 3540 if (universe == null) 3541 throw new IllegalArgumentException( 3542 getName() + " is not an enum type"); 3543 directory = new HashMap<>(2 * universe.length); 3544 for (T constant : universe) { 3545 directory.put(((Enum<?>)constant).name(), constant); 3546 } 3547 enumConstantDirectory = directory; 3548 } 3549 return directory; 3550 } 3551 private transient volatile Map<String, T> enumConstantDirectory; 3552 3553 /** 3554 * Casts an object to the class or interface represented 3555 * by this {@code Class} object. 3556 * 3557 * @param obj the object to be cast 3558 * @return the object after casting, or null if obj is null 3559 * 3560 * @throws ClassCastException if the object is not 3561 * null and is not assignable to the type T. 3562 * 3563 * @since 1.5 3564 */ 3565 @SuppressWarnings("unchecked") 3566 @HotSpotIntrinsicCandidate 3567 public T cast(Object obj) { 3568 if (obj != null && !isInstance(obj)) 3569 throw new ClassCastException(cannotCastMsg(obj)); 3570 return (T) obj; 3571 } 3572 3573 private String cannotCastMsg(Object obj) { 3574 return "Cannot cast " + obj.getClass().getName() + " to " + getName(); 3575 } 3576 3577 /** 3578 * Casts this {@code Class} object to represent a subclass of the class 3579 * represented by the specified class object. Checks that the cast 3580 * is valid, and throws a {@code ClassCastException} if it is not. If 3581 * this method succeeds, it always returns a reference to this class object. 3582 * 3583 * <p>This method is useful when a client needs to "narrow" the type of 3584 * a {@code Class} object to pass it to an API that restricts the 3585 * {@code Class} objects that it is willing to accept. A cast would 3586 * generate a compile-time warning, as the correctness of the cast 3587 * could not be checked at runtime (because generic types are implemented 3588 * by erasure). 3589 * 3590 * @param <U> the type to cast this class object to 3591 * @param clazz the class of the type to cast this class object to 3592 * @return this {@code Class} object, cast to represent a subclass of 3593 * the specified class object. 3594 * @throws ClassCastException if this {@code Class} object does not 3595 * represent a subclass of the specified class (here "subclass" includes 3596 * the class itself). 3597 * @since 1.5 3598 */ 3599 @SuppressWarnings("unchecked") 3600 public <U> Class<? extends U> asSubclass(Class<U> clazz) { 3601 if (clazz.isAssignableFrom(this)) 3602 return (Class<? extends U>) this; 3603 else 3604 throw new ClassCastException(this.toString()); 3605 } 3606 3607 /** 3608 * @throws NullPointerException {@inheritDoc} 3609 * @since 1.5 3610 */ 3611 @SuppressWarnings("unchecked") 3612 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) { 3613 Objects.requireNonNull(annotationClass); 3614 3615 return (A) annotationData().annotations.get(annotationClass); 3616 } 3617 3618 /** 3619 * {@inheritDoc} 3620 * @throws NullPointerException {@inheritDoc} 3621 * @since 1.5 3622 */ 3623 @Override 3624 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) { 3625 return GenericDeclaration.super.isAnnotationPresent(annotationClass); 3626 } 3627 3628 /** 3629 * @throws NullPointerException {@inheritDoc} 3630 * @since 1.8 3631 */ 3632 @Override 3633 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) { 3634 Objects.requireNonNull(annotationClass); 3635 3636 AnnotationData annotationData = annotationData(); 3637 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations, 3638 this, 3639 annotationClass); 3640 } 3641 3642 /** 3643 * @since 1.5 3644 */ 3645 public Annotation[] getAnnotations() { 3646 return AnnotationParser.toArray(annotationData().annotations); 3647 } 3648 3649 /** 3650 * @throws NullPointerException {@inheritDoc} 3651 * @since 1.8 3652 */ 3653 @Override 3654 @SuppressWarnings("unchecked") 3655 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) { 3656 Objects.requireNonNull(annotationClass); 3657 3658 return (A) annotationData().declaredAnnotations.get(annotationClass); 3659 } 3660 3661 /** 3662 * @throws NullPointerException {@inheritDoc} 3663 * @since 1.8 3664 */ 3665 @Override 3666 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) { 3667 Objects.requireNonNull(annotationClass); 3668 3669 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations, 3670 annotationClass); 3671 } 3672 3673 /** 3674 * @since 1.5 3675 */ 3676 public Annotation[] getDeclaredAnnotations() { 3677 return AnnotationParser.toArray(annotationData().declaredAnnotations); 3678 } 3679 3680 // annotation data that might get invalidated when JVM TI RedefineClasses() is called 3681 private static class AnnotationData { 3682 final Map<Class<? extends Annotation>, Annotation> annotations; 3683 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations; 3684 3685 // Value of classRedefinedCount when we created this AnnotationData instance 3686 final int redefinedCount; 3687 3688 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations, 3689 Map<Class<? extends Annotation>, Annotation> declaredAnnotations, 3690 int redefinedCount) { 3691 this.annotations = annotations; 3692 this.declaredAnnotations = declaredAnnotations; 3693 this.redefinedCount = redefinedCount; 3694 } 3695 } 3696 3697 // Annotations cache 3698 @SuppressWarnings("UnusedDeclaration") 3699 private transient volatile AnnotationData annotationData; 3700 3701 private AnnotationData annotationData() { 3702 while (true) { // retry loop 3703 AnnotationData annotationData = this.annotationData; 3704 int classRedefinedCount = this.classRedefinedCount; 3705 if (annotationData != null && 3706 annotationData.redefinedCount == classRedefinedCount) { 3707 return annotationData; 3708 } 3709 // null or stale annotationData -> optimistically create new instance 3710 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount); 3711 // try to install it 3712 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) { 3713 // successfully installed new AnnotationData 3714 return newAnnotationData; 3715 } 3716 } 3717 } 3718 3719 private AnnotationData createAnnotationData(int classRedefinedCount) { 3720 Map<Class<? extends Annotation>, Annotation> declaredAnnotations = 3721 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this); 3722 Class<?> superClass = getSuperclass(); 3723 Map<Class<? extends Annotation>, Annotation> annotations = null; 3724 if (superClass != null) { 3725 Map<Class<? extends Annotation>, Annotation> superAnnotations = 3726 superClass.annotationData().annotations; 3727 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) { 3728 Class<? extends Annotation> annotationClass = e.getKey(); 3729 if (AnnotationType.getInstance(annotationClass).isInherited()) { 3730 if (annotations == null) { // lazy construction 3731 annotations = new LinkedHashMap<>((Math.max( 3732 declaredAnnotations.size(), 3733 Math.min(12, declaredAnnotations.size() + superAnnotations.size()) 3734 ) * 4 + 2) / 3 3735 ); 3736 } 3737 annotations.put(annotationClass, e.getValue()); 3738 } 3739 } 3740 } 3741 if (annotations == null) { 3742 // no inherited annotations -> share the Map with declaredAnnotations 3743 annotations = declaredAnnotations; 3744 } else { 3745 // at least one inherited annotation -> declared may override inherited 3746 annotations.putAll(declaredAnnotations); 3747 } 3748 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount); 3749 } 3750 3751 // Annotation types cache their internal (AnnotationType) form 3752 3753 @SuppressWarnings("UnusedDeclaration") 3754 private transient volatile AnnotationType annotationType; 3755 3756 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) { 3757 return Atomic.casAnnotationType(this, oldType, newType); 3758 } 3759 3760 AnnotationType getAnnotationType() { 3761 return annotationType; 3762 } 3763 3764 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() { 3765 return annotationData().declaredAnnotations; 3766 } 3767 3768 /* Backing store of user-defined values pertaining to this class. 3769 * Maintained by the ClassValue class. 3770 */ 3771 transient ClassValue.ClassValueMap classValueMap; 3772 3773 /** 3774 * Returns an {@code AnnotatedType} object that represents the use of a 3775 * type to specify the superclass of the entity represented by this {@code 3776 * Class} object. (The <em>use</em> of type Foo to specify the superclass 3777 * in '... extends Foo' is distinct from the <em>declaration</em> of type 3778 * Foo.) 3779 * 3780 * <p> If this {@code Class} object represents a type whose declaration 3781 * does not explicitly indicate an annotated superclass, then the return 3782 * value is an {@code AnnotatedType} object representing an element with no 3783 * annotations. 3784 * 3785 * <p> If this {@code Class} represents either the {@code Object} class, an 3786 * interface type, an array type, a primitive type, or void, the return 3787 * value is {@code null}. 3788 * 3789 * @return an object representing the superclass 3790 * @since 1.8 3791 */ 3792 public AnnotatedType getAnnotatedSuperclass() { 3793 if (this == Object.class || 3794 isInterface() || 3795 isArray() || 3796 isPrimitive() || 3797 this == Void.TYPE) { 3798 return null; 3799 } 3800 3801 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this); 3802 } 3803 3804 /** 3805 * Returns an array of {@code AnnotatedType} objects that represent the use 3806 * of types to specify superinterfaces of the entity represented by this 3807 * {@code Class} object. (The <em>use</em> of type Foo to specify a 3808 * superinterface in '... implements Foo' is distinct from the 3809 * <em>declaration</em> of type Foo.) 3810 * 3811 * <p> If this {@code Class} object represents a class, the return value is 3812 * an array containing objects representing the uses of interface types to 3813 * specify interfaces implemented by the class. The order of the objects in 3814 * the array corresponds to the order of the interface types used in the 3815 * 'implements' clause of the declaration of this {@code Class} object. 3816 * 3817 * <p> If this {@code Class} object represents an interface, the return 3818 * value is an array containing objects representing the uses of interface 3819 * types to specify interfaces directly extended by the interface. The 3820 * order of the objects in the array corresponds to the order of the 3821 * interface types used in the 'extends' clause of the declaration of this 3822 * {@code Class} object. 3823 * 3824 * <p> If this {@code Class} object represents a class or interface whose 3825 * declaration does not explicitly indicate any annotated superinterfaces, 3826 * the return value is an array of length 0. 3827 * 3828 * <p> If this {@code Class} object represents either the {@code Object} 3829 * class, an array type, a primitive type, or void, the return value is an 3830 * array of length 0. 3831 * 3832 * @return an array representing the superinterfaces 3833 * @since 1.8 3834 */ 3835 public AnnotatedType[] getAnnotatedInterfaces() { 3836 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this); 3837 } 3838} 3839