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