ScriptObjectMirror.java revision 1297:92f7bf49eb65
1/* 2 * Copyright (c) 2010, 2013, 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 jdk.nashorn.api.scripting; 27 28import java.nio.ByteBuffer; 29import java.security.AccessControlContext; 30import java.security.AccessController; 31import java.security.Permissions; 32import java.security.PrivilegedAction; 33import java.security.ProtectionDomain; 34import java.util.AbstractMap; 35import java.util.ArrayList; 36import java.util.Collection; 37import java.util.Collections; 38import java.util.Iterator; 39import java.util.LinkedHashSet; 40import java.util.List; 41import java.util.Map; 42import java.util.Objects; 43import java.util.Set; 44import java.util.concurrent.Callable; 45import javax.script.Bindings; 46import jdk.nashorn.internal.objects.Global; 47import jdk.nashorn.internal.runtime.ConsString; 48import jdk.nashorn.internal.runtime.Context; 49import jdk.nashorn.internal.runtime.ECMAException; 50import jdk.nashorn.internal.runtime.JSONListAdapter; 51import jdk.nashorn.internal.runtime.JSType; 52import jdk.nashorn.internal.runtime.ScriptFunction; 53import jdk.nashorn.internal.runtime.ScriptObject; 54import jdk.nashorn.internal.runtime.ScriptRuntime; 55import jdk.nashorn.internal.runtime.arrays.ArrayData; 56import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor; 57 58/** 59 * Mirror object that wraps a given Nashorn Script object. 60 * 61 * @since 1.8u40 62 */ 63@jdk.Exported 64public final class ScriptObjectMirror extends AbstractJSObject implements Bindings { 65 private static AccessControlContext getContextAccCtxt() { 66 final Permissions perms = new Permissions(); 67 perms.add(new RuntimePermission(Context.NASHORN_GET_CONTEXT)); 68 return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, perms) }); 69 } 70 71 private static final AccessControlContext GET_CONTEXT_ACC_CTXT = getContextAccCtxt(); 72 73 private final ScriptObject sobj; 74 private final Global global; 75 private final boolean strict; 76 private final boolean jsonCompatible; 77 78 @Override 79 public boolean equals(final Object other) { 80 if (other instanceof ScriptObjectMirror) { 81 return sobj.equals(((ScriptObjectMirror)other).sobj); 82 } 83 84 return false; 85 } 86 87 @Override 88 public int hashCode() { 89 return sobj.hashCode(); 90 } 91 92 @Override 93 public String toString() { 94 return inGlobal(new Callable<String>() { 95 @Override 96 public String call() { 97 return ScriptRuntime.safeToString(sobj); 98 } 99 }); 100 } 101 102 // JSObject methods 103 104 @Override 105 public Object call(final Object thiz, final Object... args) { 106 final Global oldGlobal = Context.getGlobal(); 107 final boolean globalChanged = (oldGlobal != global); 108 109 try { 110 if (globalChanged) { 111 Context.setGlobal(global); 112 } 113 114 if (sobj instanceof ScriptFunction) { 115 final Object[] modArgs = globalChanged? wrapArrayLikeMe(args, oldGlobal) : args; 116 final Object self = globalChanged? wrapLikeMe(thiz, oldGlobal) : thiz; 117 return wrapLikeMe(ScriptRuntime.apply((ScriptFunction)sobj, unwrap(self, global), unwrapArray(modArgs, global))); 118 } 119 120 throw new RuntimeException("not a function: " + toString()); 121 } catch (final NashornException ne) { 122 throw ne.initEcmaError(global); 123 } catch (final RuntimeException | Error e) { 124 throw e; 125 } catch (final Throwable t) { 126 throw new RuntimeException(t); 127 } finally { 128 if (globalChanged) { 129 Context.setGlobal(oldGlobal); 130 } 131 } 132 } 133 134 @Override 135 public Object newObject(final Object... args) { 136 final Global oldGlobal = Context.getGlobal(); 137 final boolean globalChanged = (oldGlobal != global); 138 139 try { 140 if (globalChanged) { 141 Context.setGlobal(global); 142 } 143 144 if (sobj instanceof ScriptFunction) { 145 final Object[] modArgs = globalChanged? wrapArrayLikeMe(args, oldGlobal) : args; 146 return wrapLikeMe(ScriptRuntime.construct((ScriptFunction)sobj, unwrapArray(modArgs, global))); 147 } 148 149 throw new RuntimeException("not a constructor: " + toString()); 150 } catch (final NashornException ne) { 151 throw ne.initEcmaError(global); 152 } catch (final RuntimeException | Error e) { 153 throw e; 154 } catch (final Throwable t) { 155 throw new RuntimeException(t); 156 } finally { 157 if (globalChanged) { 158 Context.setGlobal(oldGlobal); 159 } 160 } 161 } 162 163 @Override 164 public Object eval(final String s) { 165 return inGlobal(new Callable<Object>() { 166 @Override 167 public Object call() { 168 final Context context = AccessController.doPrivileged( 169 new PrivilegedAction<Context>() { 170 @Override 171 public Context run() { 172 return Context.getContext(); 173 } 174 }, GET_CONTEXT_ACC_CTXT); 175 return wrapLikeMe(context.eval(global, s, sobj, null, false)); 176 } 177 }); 178 } 179 180 /** 181 * Call member function 182 * @param functionName function name 183 * @param args arguments 184 * @return return value of function 185 */ 186 public Object callMember(final String functionName, final Object... args) { 187 Objects.requireNonNull(functionName); 188 final Global oldGlobal = Context.getGlobal(); 189 final boolean globalChanged = (oldGlobal != global); 190 191 try { 192 if (globalChanged) { 193 Context.setGlobal(global); 194 } 195 196 final Object val = sobj.get(functionName); 197 if (val instanceof ScriptFunction) { 198 final Object[] modArgs = globalChanged? wrapArrayLikeMe(args, oldGlobal) : args; 199 return wrapLikeMe(ScriptRuntime.apply((ScriptFunction)val, sobj, unwrapArray(modArgs, global))); 200 } else if (val instanceof JSObject && ((JSObject)val).isFunction()) { 201 return ((JSObject)val).call(sobj, args); 202 } 203 204 throw new NoSuchMethodException("No such function " + functionName); 205 } catch (final NashornException ne) { 206 throw ne.initEcmaError(global); 207 } catch (final RuntimeException | Error e) { 208 throw e; 209 } catch (final Throwable t) { 210 throw new RuntimeException(t); 211 } finally { 212 if (globalChanged) { 213 Context.setGlobal(oldGlobal); 214 } 215 } 216 } 217 218 @Override 219 public Object getMember(final String name) { 220 Objects.requireNonNull(name); 221 return inGlobal(new Callable<Object>() { 222 @Override public Object call() { 223 return wrapLikeMe(sobj.get(name)); 224 } 225 }); 226 } 227 228 @Override 229 public Object getSlot(final int index) { 230 return inGlobal(new Callable<Object>() { 231 @Override public Object call() { 232 return wrapLikeMe(sobj.get(index)); 233 } 234 }); 235 } 236 237 @Override 238 public boolean hasMember(final String name) { 239 Objects.requireNonNull(name); 240 return inGlobal(new Callable<Boolean>() { 241 @Override public Boolean call() { 242 return sobj.has(name); 243 } 244 }); 245 } 246 247 @Override 248 public boolean hasSlot(final int slot) { 249 return inGlobal(new Callable<Boolean>() { 250 @Override public Boolean call() { 251 return sobj.has(slot); 252 } 253 }); 254 } 255 256 @Override 257 public void removeMember(final String name) { 258 Objects.requireNonNull(name); 259 remove(name); 260 } 261 262 @Override 263 public void setMember(final String name, final Object value) { 264 Objects.requireNonNull(name); 265 put(name, value); 266 } 267 268 @Override 269 public void setSlot(final int index, final Object value) { 270 inGlobal(new Callable<Void>() { 271 @Override public Void call() { 272 sobj.set(index, unwrap(value, global), getCallSiteFlags()); 273 return null; 274 } 275 }); 276 } 277 278 /** 279 * Nashorn extension: setIndexedPropertiesToExternalArrayData. 280 * set indexed properties be exposed from a given nio ByteBuffer. 281 * 282 * @param buf external buffer - should be a nio ByteBuffer 283 */ 284 public void setIndexedPropertiesToExternalArrayData(final ByteBuffer buf) { 285 inGlobal(new Callable<Void>() { 286 @Override public Void call() { 287 sobj.setArray(ArrayData.allocate(buf)); 288 return null; 289 } 290 }); 291 } 292 293 294 @Override 295 public boolean isInstance(final Object obj) { 296 if (! (obj instanceof ScriptObjectMirror)) { 297 return false; 298 } 299 300 final ScriptObjectMirror instance = (ScriptObjectMirror)obj; 301 // if not belongs to my global scope, return false 302 if (global != instance.global) { 303 return false; 304 } 305 306 return inGlobal(new Callable<Boolean>() { 307 @Override public Boolean call() { 308 return sobj.isInstance(instance.sobj); 309 } 310 }); 311 } 312 313 @Override 314 public String getClassName() { 315 return sobj.getClassName(); 316 } 317 318 @Override 319 public boolean isFunction() { 320 return sobj instanceof ScriptFunction; 321 } 322 323 @Override 324 public boolean isStrictFunction() { 325 return isFunction() && ((ScriptFunction)sobj).isStrict(); 326 } 327 328 @Override 329 public boolean isArray() { 330 return sobj.isArray(); 331 } 332 333 // javax.script.Bindings methods 334 335 @Override 336 public void clear() { 337 inGlobal(new Callable<Object>() { 338 @Override public Object call() { 339 sobj.clear(strict); 340 return null; 341 } 342 }); 343 } 344 345 @Override 346 public boolean containsKey(final Object key) { 347 checkKey(key); 348 return inGlobal(new Callable<Boolean>() { 349 @Override public Boolean call() { 350 return sobj.containsKey(key); 351 } 352 }); 353 } 354 355 @Override 356 public boolean containsValue(final Object value) { 357 return inGlobal(new Callable<Boolean>() { 358 @Override public Boolean call() { 359 return sobj.containsValue(unwrap(value, global)); 360 } 361 }); 362 } 363 364 @Override 365 public Set<Map.Entry<String, Object>> entrySet() { 366 return inGlobal(new Callable<Set<Map.Entry<String, Object>>>() { 367 @Override public Set<Map.Entry<String, Object>> call() { 368 final Iterator<String> iter = sobj.propertyIterator(); 369 final Set<Map.Entry<String, Object>> entries = new LinkedHashSet<>(); 370 371 while (iter.hasNext()) { 372 final String key = iter.next(); 373 final Object value = translateUndefined(wrapLikeMe(sobj.get(key))); 374 entries.add(new AbstractMap.SimpleImmutableEntry<>(key, value)); 375 } 376 377 return Collections.unmodifiableSet(entries); 378 } 379 }); 380 } 381 382 @Override 383 public Object get(final Object key) { 384 checkKey(key); 385 return inGlobal(new Callable<Object>() { 386 @Override public Object call() { 387 return translateUndefined(wrapLikeMe(sobj.get(key))); 388 } 389 }); 390 } 391 392 @Override 393 public boolean isEmpty() { 394 return inGlobal(new Callable<Boolean>() { 395 @Override public Boolean call() { 396 return sobj.isEmpty(); 397 } 398 }); 399 } 400 401 @Override 402 public Set<String> keySet() { 403 return inGlobal(new Callable<Set<String>>() { 404 @Override public Set<String> call() { 405 final Iterator<String> iter = sobj.propertyIterator(); 406 final Set<String> keySet = new LinkedHashSet<>(); 407 408 while (iter.hasNext()) { 409 keySet.add(iter.next()); 410 } 411 412 return Collections.unmodifiableSet(keySet); 413 } 414 }); 415 } 416 417 @Override 418 public Object put(final String key, final Object value) { 419 checkKey(key); 420 final ScriptObject oldGlobal = Context.getGlobal(); 421 final boolean globalChanged = (oldGlobal != global); 422 return inGlobal(new Callable<Object>() { 423 @Override public Object call() { 424 final Object modValue = globalChanged? wrapLikeMe(value, oldGlobal) : value; 425 return translateUndefined(wrapLikeMe(sobj.put(key, unwrap(modValue, global), strict))); 426 } 427 }); 428 } 429 430 @Override 431 public void putAll(final Map<? extends String, ? extends Object> map) { 432 Objects.requireNonNull(map, "map is null"); 433 final ScriptObject oldGlobal = Context.getGlobal(); 434 final boolean globalChanged = (oldGlobal != global); 435 inGlobal(new Callable<Object>() { 436 @Override public Object call() { 437 for (final Map.Entry<? extends String, ? extends Object> entry : map.entrySet()) { 438 final Object value = entry.getValue(); 439 final Object modValue = globalChanged? wrapLikeMe(value, oldGlobal) : value; 440 final String key = entry.getKey(); 441 checkKey(key); 442 sobj.set(key, unwrap(modValue, global), getCallSiteFlags()); 443 } 444 return null; 445 } 446 }); 447 } 448 449 @Override 450 public Object remove(final Object key) { 451 checkKey(key); 452 return inGlobal(new Callable<Object>() { 453 @Override public Object call() { 454 return translateUndefined(wrapLikeMe(sobj.remove(key, strict))); 455 } 456 }); 457 } 458 459 /** 460 * Delete a property from this object. 461 * 462 * @param key the property to be deleted 463 * 464 * @return if the delete was successful or not 465 */ 466 public boolean delete(final Object key) { 467 return inGlobal(new Callable<Boolean>() { 468 @Override public Boolean call() { 469 return sobj.delete(unwrap(key, global), strict); 470 } 471 }); 472 } 473 474 @Override 475 public int size() { 476 return inGlobal(new Callable<Integer>() { 477 @Override public Integer call() { 478 return sobj.size(); 479 } 480 }); 481 } 482 483 @Override 484 public Collection<Object> values() { 485 return inGlobal(new Callable<Collection<Object>>() { 486 @Override public Collection<Object> call() { 487 final List<Object> values = new ArrayList<>(size()); 488 final Iterator<Object> iter = sobj.valueIterator(); 489 490 while (iter.hasNext()) { 491 values.add(translateUndefined(wrapLikeMe(iter.next()))); 492 } 493 494 return Collections.unmodifiableList(values); 495 } 496 }); 497 } 498 499 // Support for ECMAScript Object API on mirrors 500 501 /** 502 * Return the __proto__ of this object. 503 * @return __proto__ object. 504 */ 505 public Object getProto() { 506 return inGlobal(new Callable<Object>() { 507 @Override public Object call() { 508 return wrapLikeMe(sobj.getProto()); 509 } 510 }); 511 } 512 513 /** 514 * Set the __proto__ of this object. 515 * @param proto new proto for this object 516 */ 517 public void setProto(final Object proto) { 518 inGlobal(new Callable<Void>() { 519 @Override public Void call() { 520 sobj.setPrototypeOf(unwrap(proto, global)); 521 return null; 522 } 523 }); 524 } 525 526 /** 527 * ECMA 8.12.1 [[GetOwnProperty]] (P) 528 * 529 * @param key property key 530 * 531 * @return Returns the Property Descriptor of the named own property of this 532 * object, or undefined if absent. 533 */ 534 public Object getOwnPropertyDescriptor(final String key) { 535 return inGlobal(new Callable<Object>() { 536 @Override public Object call() { 537 return wrapLikeMe(sobj.getOwnPropertyDescriptor(key)); 538 } 539 }); 540 } 541 542 /** 543 * return an array of own property keys associated with the object. 544 * 545 * @param all True if to include non-enumerable keys. 546 * @return Array of keys. 547 */ 548 public String[] getOwnKeys(final boolean all) { 549 return inGlobal(new Callable<String[]>() { 550 @Override public String[] call() { 551 return sobj.getOwnKeys(all); 552 } 553 }); 554 } 555 556 /** 557 * Flag this script object as non extensible 558 * 559 * @return the object after being made non extensible 560 */ 561 public ScriptObjectMirror preventExtensions() { 562 return inGlobal(new Callable<ScriptObjectMirror>() { 563 @Override public ScriptObjectMirror call() { 564 sobj.preventExtensions(); 565 return ScriptObjectMirror.this; 566 } 567 }); 568 } 569 570 /** 571 * Check if this script object is extensible 572 * @return true if extensible 573 */ 574 public boolean isExtensible() { 575 return inGlobal(new Callable<Boolean>() { 576 @Override public Boolean call() { 577 return sobj.isExtensible(); 578 } 579 }); 580 } 581 582 /** 583 * ECMAScript 15.2.3.8 - seal implementation 584 * @return the sealed script object 585 */ 586 public ScriptObjectMirror seal() { 587 return inGlobal(new Callable<ScriptObjectMirror>() { 588 @Override public ScriptObjectMirror call() { 589 sobj.seal(); 590 return ScriptObjectMirror.this; 591 } 592 }); 593 } 594 595 /** 596 * Check whether this script object is sealed 597 * @return true if sealed 598 */ 599 public boolean isSealed() { 600 return inGlobal(new Callable<Boolean>() { 601 @Override public Boolean call() { 602 return sobj.isSealed(); 603 } 604 }); 605 } 606 607 /** 608 * ECMA 15.2.39 - freeze implementation. Freeze this script object 609 * @return the frozen script object 610 */ 611 public ScriptObjectMirror freeze() { 612 return inGlobal(new Callable<ScriptObjectMirror>() { 613 @Override public ScriptObjectMirror call() { 614 sobj.freeze(); 615 return ScriptObjectMirror.this; 616 } 617 }); 618 } 619 620 /** 621 * Check whether this script object is frozen 622 * @return true if frozen 623 */ 624 public boolean isFrozen() { 625 return inGlobal(new Callable<Boolean>() { 626 @Override public Boolean call() { 627 return sobj.isFrozen(); 628 } 629 }); 630 } 631 632 /** 633 * Utility to check if given object is ECMAScript undefined value 634 * 635 * @param obj object to check 636 * @return true if 'obj' is ECMAScript undefined value 637 */ 638 public static boolean isUndefined(final Object obj) { 639 return obj == ScriptRuntime.UNDEFINED; 640 } 641 642 /** 643 * Utility to convert this script object to the given type. 644 * 645 * @param <T> destination type to convert to 646 * @param type destination type to convert to 647 * @return converted object 648 */ 649 public <T> T to(final Class<T> type) { 650 return inGlobal(new Callable<T>() { 651 @Override 652 public T call() { 653 return type.cast(ScriptUtils.convert(sobj, type)); 654 } 655 }); 656 } 657 658 /** 659 * Make a script object mirror on given object if needed. Also converts ConsString instances to Strings. 660 * 661 * @param obj object to be wrapped/converted 662 * @param homeGlobal global to which this object belongs. Not used for ConsStrings. 663 * @return wrapped/converted object 664 */ 665 public static Object wrap(final Object obj, final Object homeGlobal) { 666 return wrap(obj, homeGlobal, false); 667 } 668 669 /** 670 * Make a script object mirror on given object if needed. Also converts ConsString instances to Strings. The 671 * created wrapper will implement the Java {@code List} interface if {@code obj} is a JavaScript 672 * {@code Array} object; this is compatible with Java JSON libraries expectations. Arrays retrieved through its 673 * properties (transitively) will also implement the list interface. 674 * 675 * @param obj object to be wrapped/converted 676 * @param homeGlobal global to which this object belongs. Not used for ConsStrings. 677 * @return wrapped/converted object 678 */ 679 public static Object wrapAsJSONCompatible(final Object obj, final Object homeGlobal) { 680 return wrap(obj, homeGlobal, true); 681 } 682 683 /** 684 * Make a script object mirror on given object if needed. Also converts ConsString instances to Strings. 685 * 686 * @param obj object to be wrapped/converted 687 * @param homeGlobal global to which this object belongs. Not used for ConsStrings. 688 * @param jsonCompatible if true, the created wrapper will implement the Java {@code List} interface if 689 * {@code obj} is a JavaScript {@code Array} object. Arrays retrieved through its properties (transitively) 690 * will also implement the list interface. 691 * @return wrapped/converted object 692 */ 693 private static Object wrap(final Object obj, final Object homeGlobal, final boolean jsonCompatible) { 694 if(obj instanceof ScriptObject) { 695 if (!(homeGlobal instanceof Global)) { 696 return obj; 697 } 698 final ScriptObject sobj = (ScriptObject)obj; 699 final Global global = (Global)homeGlobal; 700 final ScriptObjectMirror mirror = new ScriptObjectMirror(sobj, global, jsonCompatible); 701 if (jsonCompatible && sobj.isArray()) { 702 return new JSONListAdapter(mirror, global); 703 } 704 return mirror; 705 } else if(obj instanceof ConsString) { 706 return obj.toString(); 707 } else if (jsonCompatible && obj instanceof ScriptObjectMirror) { 708 // Since choosing JSON compatible representation is an explicit decision on user's part, if we're asked to 709 // wrap a mirror that was not JSON compatible, explicitly create its compatible counterpart following the 710 // principle of least surprise. 711 return ((ScriptObjectMirror)obj).asJSONCompatible(); 712 } 713 return obj; 714 } 715 716 /** 717 * Wraps the passed object with the same jsonCompatible flag as this mirror. 718 * @param obj the object 719 * @param homeGlobal the object's home global. 720 * @return a wrapper for the object. 721 */ 722 private Object wrapLikeMe(final Object obj, final Object homeGlobal) { 723 return wrap(obj, homeGlobal, jsonCompatible); 724 } 725 726 /** 727 * Wraps the passed object with the same home global and jsonCompatible flag as this mirror. 728 * @param obj the object 729 * @return a wrapper for the object. 730 */ 731 private Object wrapLikeMe(final Object obj) { 732 return wrapLikeMe(obj, global); 733 } 734 735 /** 736 * Unwrap a script object mirror if needed. 737 * 738 * @param obj object to be unwrapped 739 * @param homeGlobal global to which this object belongs 740 * @return unwrapped object 741 */ 742 public static Object unwrap(final Object obj, final Object homeGlobal) { 743 if (obj instanceof ScriptObjectMirror) { 744 final ScriptObjectMirror mirror = (ScriptObjectMirror)obj; 745 return (mirror.global == homeGlobal)? mirror.sobj : obj; 746 } else if (obj instanceof JSONListAdapter) { 747 return ((JSONListAdapter)obj).unwrap(homeGlobal); 748 } 749 750 return obj; 751 } 752 753 /** 754 * Wrap an array of object to script object mirrors if needed. 755 * 756 * @param args array to be unwrapped 757 * @param homeGlobal global to which this object belongs 758 * @return wrapped array 759 */ 760 public static Object[] wrapArray(final Object[] args, final Object homeGlobal) { 761 return wrapArray(args, homeGlobal, false); 762 } 763 764 private static Object[] wrapArray(final Object[] args, final Object homeGlobal, final boolean jsonCompatible) { 765 if (args == null || args.length == 0) { 766 return args; 767 } 768 769 final Object[] newArgs = new Object[args.length]; 770 int index = 0; 771 for (final Object obj : args) { 772 newArgs[index] = wrap(obj, homeGlobal, jsonCompatible); 773 index++; 774 } 775 return newArgs; 776 } 777 778 private Object[] wrapArrayLikeMe(final Object[] args, final Object homeGlobal) { 779 return wrapArray(args, homeGlobal, jsonCompatible); 780 } 781 782 /** 783 * Unwrap an array of script object mirrors if needed. 784 * 785 * @param args array to be unwrapped 786 * @param homeGlobal global to which this object belongs 787 * @return unwrapped array 788 */ 789 public static Object[] unwrapArray(final Object[] args, final Object homeGlobal) { 790 if (args == null || args.length == 0) { 791 return args; 792 } 793 794 final Object[] newArgs = new Object[args.length]; 795 int index = 0; 796 for (final Object obj : args) { 797 newArgs[index] = unwrap(obj, homeGlobal); 798 index++; 799 } 800 return newArgs; 801 } 802 803 /** 804 * Are the given objects mirrors to same underlying object? 805 * 806 * @param obj1 first object 807 * @param obj2 second object 808 * @return true if obj1 and obj2 are identical script objects or mirrors of it. 809 */ 810 public static boolean identical(final Object obj1, final Object obj2) { 811 final Object o1 = (obj1 instanceof ScriptObjectMirror)? 812 ((ScriptObjectMirror)obj1).sobj : obj1; 813 814 final Object o2 = (obj2 instanceof ScriptObjectMirror)? 815 ((ScriptObjectMirror)obj2).sobj : obj2; 816 817 return o1 == o2; 818 } 819 820 // package-privates below this. 821 822 ScriptObjectMirror(final ScriptObject sobj, final Global global) { 823 this(sobj, global, false); 824 } 825 826 private ScriptObjectMirror(final ScriptObject sobj, final Global global, final boolean jsonCompatible) { 827 assert sobj != null : "ScriptObjectMirror on null!"; 828 assert global != null : "home Global is null"; 829 830 this.sobj = sobj; 831 this.global = global; 832 this.strict = global.isStrictContext(); 833 this.jsonCompatible = jsonCompatible; 834 } 835 836 // accessors for script engine 837 ScriptObject getScriptObject() { 838 return sobj; 839 } 840 841 Global getHomeGlobal() { 842 return global; 843 } 844 845 static Object translateUndefined(final Object obj) { 846 return (obj == ScriptRuntime.UNDEFINED)? null : obj; 847 } 848 849 private int getCallSiteFlags() { 850 return strict ? NashornCallSiteDescriptor.CALLSITE_STRICT : 0; 851 } 852 853 // internals only below this. 854 private <V> V inGlobal(final Callable<V> callable) { 855 final Global oldGlobal = Context.getGlobal(); 856 final boolean globalChanged = (oldGlobal != global); 857 if (globalChanged) { 858 Context.setGlobal(global); 859 } 860 try { 861 return callable.call(); 862 } catch (final NashornException ne) { 863 throw ne.initEcmaError(global); 864 } catch (final RuntimeException e) { 865 throw e; 866 } catch (final Exception e) { 867 throw new AssertionError("Cannot happen", e); 868 } finally { 869 if (globalChanged) { 870 Context.setGlobal(oldGlobal); 871 } 872 } 873 } 874 875 /** 876 * Ensures the key is not null, empty string, or a non-String object. The contract of the {@link Bindings} 877 * interface requires that these are not accepted as keys. 878 * @param key the key to check 879 * @throws NullPointerException if key is null 880 * @throws ClassCastException if key is not a String 881 * @throws IllegalArgumentException if key is empty string 882 */ 883 private static void checkKey(final Object key) { 884 Objects.requireNonNull(key, "key can not be null"); 885 886 if (!(key instanceof String)) { 887 throw new ClassCastException("key should be a String. It is " + key.getClass().getName() + " instead."); 888 } else if (((String)key).length() == 0) { 889 throw new IllegalArgumentException("key can not be empty"); 890 } 891 } 892 893 @Override @Deprecated 894 public double toNumber() { 895 return inGlobal(new Callable<Double>() { 896 @Override public Double call() { 897 return JSType.toNumber(sobj); 898 } 899 }); 900 } 901 902 @Override 903 public Object getDefaultValue(final Class<?> hint) { 904 return inGlobal(new Callable<Object>() { 905 @Override public Object call() { 906 try { 907 return sobj.getDefaultValue(hint); 908 } catch (final ECMAException e) { 909 // We're catching ECMAException (likely TypeError), and translating it to 910 // UnsupportedOperationException. This in turn will be translated into TypeError of the 911 // caller's Global by JSType#toPrimitive(JSObject,Class) therefore ensuring that it's 912 // recognized as "instanceof TypeError" in the caller. 913 throw new UnsupportedOperationException(e.getMessage(), e); 914 } 915 } 916 }); 917 } 918 919 private ScriptObjectMirror asJSONCompatible() { 920 if (this.jsonCompatible) { 921 return this; 922 } 923 return new ScriptObjectMirror(sobj, global, true); 924 } 925} 926