1 | /* |
2 | * Copyright 2005-2006 Sun Microsystems, Inc. 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. Sun designates this |
8 | * particular file as subject to the "Classpath" exception as provided |
9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
23 | * have any questions. |
24 | */ |
25 | |
26 | package com.sun.tools.javac.model; |
27 | |
28 | import java.lang.annotation.Annotation; |
29 | import java.lang.annotation.Inherited; |
30 | import java.util.Map; |
31 | import javax.lang.model.SourceVersion; |
32 | import javax.lang.model.element.*; |
33 | import javax.lang.model.type.DeclaredType; |
34 | import javax.lang.model.util.Elements; |
35 | import javax.tools.JavaFileObject; |
36 | import com.sun.tools.javac.code.*; |
37 | import com.sun.tools.javac.code.Symbol.*; |
38 | import com.sun.tools.javac.code.TypeTags; |
39 | import com.sun.tools.javac.comp.AttrContext; |
40 | import com.sun.tools.javac.comp.Enter; |
41 | import com.sun.tools.javac.comp.Env; |
42 | import com.sun.tools.javac.jvm.ClassReader; |
43 | import com.sun.tools.javac.main.JavaCompiler; |
44 | import com.sun.tools.javac.processing.PrintingProcessor; |
45 | import com.sun.tools.javac.tree.JCTree; |
46 | import com.sun.tools.javac.tree.JCTree.*; |
47 | import com.sun.tools.javac.tree.TreeInfo; |
48 | import com.sun.tools.javac.tree.TreeScanner; |
49 | import com.sun.tools.javac.util.Name; |
50 | import com.sun.tools.javac.util.*; |
51 | |
52 | import static javax.lang.model.util.ElementFilter.methodsIn; |
53 | |
54 | /** |
55 | * Utility methods for operating on program elements. |
56 | * |
57 | * <p><b>This is NOT part of any API supported by Sun Microsystems. |
58 | * If you write code that depends on this, you do so at your own |
59 | * risk. This code and its internal interfaces are subject to change |
60 | * or deletion without notice.</b></p> |
61 | */ |
62 | public class JavacElements implements Elements { |
63 | |
64 | private JavaCompiler javaCompiler; |
65 | private Symtab syms; |
66 | private Name.Table names; |
67 | private Types types; |
68 | private Enter enter; |
69 | private ClassReader reader; |
70 | |
71 | private static final Context.Key<JavacElements> KEY = |
72 | new Context.Key<JavacElements>(); |
73 | |
74 | public static JavacElements instance(Context context) { |
75 | JavacElements instance = context.get(KEY); |
76 | if (instance == null) { |
77 | instance = new JavacElements(context); |
78 | context.put(KEY, instance); |
79 | } |
80 | return instance; |
81 | } |
82 | |
83 | /** |
84 | * Public for use only by JavacProcessingEnvironment |
85 | */ |
86 | // TODO JavacElements constructor should be protected |
87 | public JavacElements(Context context) { |
88 | setContext(context); |
89 | } |
90 | |
91 | /** |
92 | * Use a new context. May be called from outside to update |
93 | * internal state for a new annotation-processing round. |
94 | * This instance is *not* then registered with the new context. |
95 | */ |
96 | public void setContext(Context context) { |
97 | javaCompiler = JavaCompiler.instance(context); |
98 | syms = Symtab.instance(context); |
99 | names = Name.Table.instance(context); |
100 | types = Types.instance(context); |
101 | enter = Enter.instance(context); |
102 | reader = ClassReader.instance(context); |
103 | } |
104 | |
105 | |
106 | /** |
107 | * An internal-use utility that creates a reified annotation. |
108 | */ |
109 | public static <A extends Annotation> A getAnnotation(Symbol annotated, |
110 | Class<A> annoType) { |
111 | if (!annoType.isAnnotation()) |
112 | throw new IllegalArgumentException("Not an annotation type: " |
113 | + annoType); |
114 | String name = annoType.getName(); |
115 | for (Attribute.Compound anno : annotated.getAnnotationMirrors()) |
116 | if (name.equals(anno.type.tsym.flatName().toString())) |
117 | return AnnotationProxyMaker.generateAnnotation(anno, annoType); |
118 | return null; |
119 | } |
120 | |
121 | /** |
122 | * An internal-use utility that creates a reified annotation. |
123 | * This overloaded version take annotation inheritance into account. |
124 | */ |
125 | public static <A extends Annotation> A getAnnotation(ClassSymbol annotated, |
126 | Class<A> annoType) { |
127 | boolean inherited = annoType.isAnnotationPresent(Inherited.class); |
128 | A result = null; |
129 | while (annotated.name != annotated.name.table.java_lang_Object) { |
130 | result = getAnnotation((Symbol)annotated, annoType); |
131 | if (result != null || !inherited) |
132 | break; |
133 | Type sup = annotated.getSuperclass(); |
134 | if (sup.tag != TypeTags.CLASS || sup.isErroneous()) |
135 | break; |
136 | annotated = (ClassSymbol) sup.tsym; |
137 | } |
138 | return result; |
139 | } |
140 | |
141 | |
142 | public PackageSymbol getPackageElement(CharSequence name) { |
143 | String strName = name.toString(); |
144 | if (strName.equals("")) |
145 | return syms.unnamedPackage; |
146 | return SourceVersion.isName(strName) |
147 | ? nameToSymbol(strName, PackageSymbol.class) |
148 | : null; |
149 | } |
150 | |
151 | public ClassSymbol getTypeElement(CharSequence name) { |
152 | String strName = name.toString(); |
153 | return SourceVersion.isName(strName) |
154 | ? nameToSymbol(strName, ClassSymbol.class) |
155 | : null; |
156 | } |
157 | |
158 | /** |
159 | * Returns a symbol given the type's or packages's canonical name, |
160 | * or null if the name isn't found. |
161 | */ |
162 | private <S extends Symbol> S nameToSymbol(String nameStr, Class<S> clazz) { |
163 | Name name = names.fromString(nameStr); |
164 | // First check cache. |
165 | Symbol sym = (clazz == ClassSymbol.class) |
166 | ? syms.classes.get(name) |
167 | : syms.packages.get(name); |
168 | |
169 | try { |
170 | if (sym == null) |
171 | sym = javaCompiler.resolveIdent(nameStr); |
172 | |
173 | sym.complete(); |
174 | |
175 | return (sym.kind != Kinds.ERR && |
176 | sym.exists() && |
177 | clazz.isInstance(sym) && |
178 | name.equals(sym.getQualifiedName())) |
179 | ? clazz.cast(sym) |
180 | : null; |
181 | } catch (CompletionFailure e) { |
182 | return null; |
183 | } |
184 | } |
185 | |
186 | public JavacSourcePosition getSourcePosition(Element e) { |
187 | Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e); |
188 | if (treeTop == null) |
189 | return null; |
190 | JCTree tree = treeTop.fst; |
191 | JCCompilationUnit toplevel = treeTop.snd; |
192 | JavaFileObject sourcefile = toplevel.sourcefile; |
193 | if (sourcefile == null) |
194 | return null; |
195 | return new JavacSourcePosition(sourcefile, tree.pos, toplevel.lineMap); |
196 | } |
197 | |
198 | public JavacSourcePosition getSourcePosition(Element e, AnnotationMirror a) { |
199 | Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e); |
200 | if (treeTop == null) |
201 | return null; |
202 | JCTree tree = treeTop.fst; |
203 | JCCompilationUnit toplevel = treeTop.snd; |
204 | JavaFileObject sourcefile = toplevel.sourcefile; |
205 | if (sourcefile == null) |
206 | return null; |
207 | |
208 | JCTree annoTree = matchAnnoToTree(a, e, tree); |
209 | if (annoTree == null) |
210 | return null; |
211 | return new JavacSourcePosition(sourcefile, annoTree.pos, |
212 | toplevel.lineMap); |
213 | } |
214 | |
215 | public JavacSourcePosition getSourcePosition(Element e, AnnotationMirror a, |
216 | AnnotationValue v) { |
217 | // TODO: better accuracy in getSourcePosition(... AnnotationValue) |
218 | return getSourcePosition(e, a); |
219 | } |
220 | |
221 | /** |
222 | * Returns the tree for an annotation given the annotated element |
223 | * and the element's own tree. Returns null if the tree cannot be found. |
224 | */ |
225 | private JCTree matchAnnoToTree(AnnotationMirror findme, |
226 | Element e, JCTree tree) { |
227 | Symbol sym = cast(Symbol.class, e); |
228 | class Vis extends JCTree.Visitor { |
229 | List<JCAnnotation> result = null; |
230 | public void visitTopLevel(JCCompilationUnit tree) { |
231 | result = tree.packageAnnotations; |
232 | } |
233 | public void visitClassDef(JCClassDecl tree) { |
234 | result = tree.mods.annotations; |
235 | } |
236 | public void visitMethodDef(JCMethodDecl tree) { |
237 | result = tree.mods.annotations; |
238 | } |
239 | public void visitVarDef(JCVariableDecl tree) { |
240 | result = tree.mods.annotations; |
241 | } |
242 | } |
243 | Vis vis = new Vis(); |
244 | tree.accept(vis); |
245 | if (vis.result == null) |
246 | return null; |
247 | return matchAnnoToTree(cast(Attribute.Compound.class, findme), |
248 | sym.getAnnotationMirrors(), |
249 | vis.result); |
250 | } |
251 | |
252 | /** |
253 | * Returns the tree for an annotation given a list of annotations |
254 | * in which to search (recursively) and their corresponding trees. |
255 | * Returns null if the tree cannot be found. |
256 | */ |
257 | private JCTree matchAnnoToTree(Attribute.Compound findme, |
258 | List<Attribute.Compound> annos, |
259 | List<JCAnnotation> trees) { |
260 | for (Attribute.Compound anno : annos) { |
261 | for (JCAnnotation tree : trees) { |
262 | JCTree match = matchAnnoToTree(findme, anno, tree); |
263 | if (match != null) |
264 | return match; |
265 | } |
266 | } |
267 | return null; |
268 | } |
269 | |
270 | /** |
271 | * Returns the tree for an annotation given an Attribute to |
272 | * search (recursively) and its corresponding tree. |
273 | * Returns null if the tree cannot be found. |
274 | */ |
275 | private JCTree matchAnnoToTree(final Attribute.Compound findme, |
276 | final Attribute attr, |
277 | final JCTree tree) { |
278 | if (attr == findme) |
279 | return (tree.type.tsym == findme.type.tsym) ? tree : null; |
280 | |
281 | class Vis implements Attribute.Visitor { |
282 | JCTree result = null; |
283 | public void visitConstant(Attribute.Constant value) { |
284 | } |
285 | public void visitClass(Attribute.Class clazz) { |
286 | } |
287 | public void visitCompound(Attribute.Compound anno) { |
288 | for (Pair<MethodSymbol, Attribute> pair : anno.values) { |
289 | JCExpression expr = scanForAssign(pair.fst, tree); |
290 | if (expr != null) { |
291 | JCTree match = matchAnnoToTree(findme, pair.snd, expr); |
292 | if (match != null) { |
293 | result = match; |
294 | return; |
295 | } |
296 | } |
297 | } |
298 | } |
299 | public void visitArray(Attribute.Array array) { |
300 | if (tree.getTag() == JCTree.NEWARRAY && |
301 | types.elemtype(array.type).tsym == findme.type.tsym) { |
302 | List<JCExpression> elems = ((JCNewArray) tree).elems; |
303 | for (Attribute value : array.values) { |
304 | if (value == findme) { |
305 | result = elems.head; |
306 | return; |
307 | } |
308 | elems = elems.tail; |
309 | } |
310 | } |
311 | } |
312 | public void visitEnum(Attribute.Enum e) { |
313 | } |
314 | public void visitError(Attribute.Error e) { |
315 | } |
316 | } |
317 | Vis vis = new Vis(); |
318 | attr.accept(vis); |
319 | return vis.result; |
320 | } |
321 | |
322 | /** |
323 | * Scans for a JCAssign node with a LHS matching a given |
324 | * symbol, and returns its RHS. Does not scan nested JCAnnotations. |
325 | */ |
326 | private JCExpression scanForAssign(final MethodSymbol sym, |
327 | final JCTree tree) { |
328 | class TS extends TreeScanner { |
329 | JCExpression result = null; |
330 | public void scan(JCTree t) { |
331 | if (t != null && result == null) |
332 | t.accept(this); |
333 | } |
334 | public void visitAnnotation(JCAnnotation t) { |
335 | if (t == tree) |
336 | scan(t.args); |
337 | } |
338 | public void visitAssign(JCAssign t) { |
339 | if (t.lhs.getTag() == JCTree.IDENT) { |
340 | JCIdent ident = (JCIdent) t.lhs; |
341 | if (ident.sym == sym) |
342 | result = t.rhs; |
343 | } |
344 | } |
345 | } |
346 | TS scanner = new TS(); |
347 | tree.accept(scanner); |
348 | return scanner.result; |
349 | } |
350 | |
351 | /** |
352 | * Returns the tree node corresponding to this element, or null |
353 | * if none can be found. |
354 | */ |
355 | public JCTree getTree(Element e) { |
356 | Pair<JCTree, ?> treeTop = getTreeAndTopLevel(e); |
357 | return (treeTop != null) ? treeTop.fst : null; |
358 | } |
359 | |
360 | public String getDocComment(Element e) { |
361 | // Our doc comment is contained in a map in our toplevel, |
362 | // indexed by our tree. Find our enter environment, which gives |
363 | // us our toplevel. It also gives us a tree that contains our |
364 | // tree: walk it to find our tree. This is painful. |
365 | Pair<JCTree, JCCompilationUnit> treeTop = getTreeAndTopLevel(e); |
366 | if (treeTop == null) |
367 | return null; |
368 | JCTree tree = treeTop.fst; |
369 | JCCompilationUnit toplevel = treeTop.snd; |
370 | if (toplevel.docComments == null) |
371 | return null; |
372 | return toplevel.docComments.get(tree); |
373 | } |
374 | |
375 | public PackageElement getPackageOf(Element e) { |
376 | return cast(Symbol.class, e).packge(); |
377 | } |
378 | |
379 | public boolean isDeprecated(Element e) { |
380 | Symbol sym = cast(Symbol.class, e); |
381 | return (sym.flags() & Flags.DEPRECATED) != 0; |
382 | } |
383 | |
384 | public Name getBinaryName(TypeElement type) { |
385 | return cast(TypeSymbol.class, type).flatName(); |
386 | } |
387 | |
388 | public Map<MethodSymbol, Attribute> getElementValuesWithDefaults( |
389 | AnnotationMirror a) { |
390 | Attribute.Compound anno = cast(Attribute.Compound.class, a); |
391 | DeclaredType annotype = a.getAnnotationType(); |
392 | Map<MethodSymbol, Attribute> valmap = anno.getElementValues(); |
393 | |
394 | for (ExecutableElement ex : |
395 | methodsIn(annotype.asElement().getEnclosedElements())) { |
396 | MethodSymbol meth = (MethodSymbol) ex; |
397 | Attribute defaultValue = meth.getDefaultValue(); |
398 | if (defaultValue != null && !valmap.containsKey(meth)) { |
399 | valmap.put(meth, defaultValue); |
400 | } |
401 | } |
402 | return valmap; |
403 | } |
404 | |
405 | /** |
406 | * {@inheritDoc} |
407 | */ |
408 | public FilteredMemberList getAllMembers(TypeElement element) { |
409 | Symbol sym = cast(Symbol.class, element); |
410 | Scope scope = sym.members().dupUnshared(); |
411 | List<Type> closure = types.closure(sym.asType()); |
412 | for (Type t : closure) |
413 | addMembers(scope, t); |
414 | return new FilteredMemberList(scope); |
415 | } |
416 | // where |
417 | private void addMembers(Scope scope, Type type) { |
418 | members: |
419 | for (Scope.Entry e = type.asElement().members().elems; e != null; e = e.sibling) { |
420 | Scope.Entry overrider = scope.lookup(e.sym.getSimpleName()); |
421 | while (overrider.scope != null) { |
422 | if (overrider.sym.kind == e.sym.kind |
423 | && (overrider.sym.flags() & Flags.SYNTHETIC) == 0) |
424 | { |
425 | if (overrider.sym.getKind() == ElementKind.METHOD |
426 | && overrides((ExecutableElement)overrider.sym, (ExecutableElement)e.sym, (TypeElement)type.asElement())) { |
427 | continue members; |
428 | } |
429 | } |
430 | overrider = overrider.next(); |
431 | } |
432 | boolean derived = e.sym.getEnclosingElement() != scope.owner; |
433 | ElementKind kind = e.sym.getKind(); |
434 | boolean initializer = kind == ElementKind.CONSTRUCTOR |
435 | || kind == ElementKind.INSTANCE_INIT |
436 | || kind == ElementKind.STATIC_INIT; |
437 | if (!derived || (!initializer && e.sym.isInheritedIn(scope.owner, types))) |
438 | scope.enter(e.sym); |
439 | } |
440 | } |
441 | |
442 | /** |
443 | * Returns all annotations of an element, whether |
444 | * inherited or directly present. |
445 | * |
446 | * @param e the element being examined |
447 | * @return all annotations of the element |
448 | */ |
449 | public List<Attribute.Compound> getAllAnnotationMirrors(Element e) { |
450 | Symbol sym = cast(Symbol.class, e); |
451 | List<Attribute.Compound> annos = sym.getAnnotationMirrors(); |
452 | while (sym.getKind() == ElementKind.CLASS) { |
453 | Type sup = ((ClassSymbol) sym).getSuperclass(); |
454 | if (sup.tag != TypeTags.CLASS || sup.isErroneous() || |
455 | sup.tsym == syms.objectType.tsym) { |
456 | break; |
457 | } |
458 | sym = sup.tsym; |
459 | List<Attribute.Compound> oldAnnos = annos; |
460 | for (Attribute.Compound anno : sym.getAnnotationMirrors()) { |
461 | if (isInherited(anno.type) && |
462 | !containsAnnoOfType(oldAnnos, anno.type)) { |
463 | annos = annos.prepend(anno); |
464 | } |
465 | } |
466 | } |
467 | return annos; |
468 | } |
469 | |
470 | /** |
471 | * Tests whether an annotation type is @Inherited. |
472 | */ |
473 | private boolean isInherited(Type annotype) { |
474 | for (Attribute.Compound anno : annotype.tsym.getAnnotationMirrors()) { |
475 | if (anno.type.tsym == syms.inheritedType.tsym) |
476 | return true; |
477 | } |
478 | return false; |
479 | } |
480 | |
481 | /** |
482 | * Tests whether a list of annotations contains an annotation |
483 | * of a given type. |
484 | */ |
485 | private static boolean containsAnnoOfType(List<Attribute.Compound> annos, |
486 | Type type) { |
487 | for (Attribute.Compound anno : annos) { |
488 | if (anno.type.tsym == type.tsym) |
489 | return true; |
490 | } |
491 | return false; |
492 | } |
493 | |
494 | public boolean hides(Element hiderEl, Element hideeEl) { |
495 | Symbol hider = cast(Symbol.class, hiderEl); |
496 | Symbol hidee = cast(Symbol.class, hideeEl); |
497 | |
498 | // Fields only hide fields; methods only methods; types only types. |
499 | // Names must match. Nothing hides itself (just try it). |
500 | if (hider == hidee || |
501 | hider.kind != hidee.kind || |
502 | hider.name != hidee.name) { |
503 | return false; |
504 | } |
505 | |
506 | // Only static methods can hide other methods. |
507 | // Methods only hide methods with matching signatures. |
508 | if (hider.kind == Kinds.MTH) { |
509 | if (!hider.isStatic() || |
510 | !types.isSubSignature(hider.type, hidee.type)) { |
511 | return false; |
512 | } |
513 | } |
514 | |
515 | // Hider must be in a subclass of hidee's class. |
516 | // Note that if M1 hides M2, and M2 hides M3, and M3 is accessible |
517 | // in M1's class, then M1 and M2 both hide M3. |
518 | ClassSymbol hiderClass = hider.owner.enclClass(); |
519 | ClassSymbol hideeClass = hidee.owner.enclClass(); |
520 | if (hiderClass == null || hideeClass == null || |
521 | !hiderClass.isSubClass(hideeClass, types)) { |
522 | return false; |
523 | } |
524 | |
525 | // Hidee must be accessible in hider's class. |
526 | // The method isInheritedIn is poorly named: it checks only access. |
527 | return hidee.isInheritedIn(hiderClass, types); |
528 | } |
529 | |
530 | public boolean overrides(ExecutableElement riderEl, |
531 | ExecutableElement rideeEl, TypeElement typeEl) { |
532 | MethodSymbol rider = cast(MethodSymbol.class, riderEl); |
533 | MethodSymbol ridee = cast(MethodSymbol.class, rideeEl); |
534 | ClassSymbol origin = cast(ClassSymbol.class, typeEl); |
535 | |
536 | return rider.name == ridee.name && |
537 | |
538 | // not reflexive as per JLS |
539 | rider != ridee && |
540 | |
541 | // we don't care if ridee is static, though that wouldn't |
542 | // compile |
543 | !rider.isStatic() && |
544 | |
545 | // Symbol.overrides assumes the following |
546 | ridee.isMemberOf(origin, types) && |
547 | |
548 | // check access and signatures; don't check return types |
549 | rider.overrides(ridee, origin, types, false); |
550 | } |
551 | |
552 | public String getConstantExpression(Object value) { |
553 | return Constants.format(value); |
554 | } |
555 | |
556 | /** |
557 | * Print a representation of the elements to the given writer in |
558 | * the specified order. The main purpose of this method is for |
559 | * diagnostics. The exact format of the output is <em>not</em> |
560 | * specified and is subject to change. |
561 | * |
562 | * @param w the writer to print the output to |
563 | * @param elements the elements to print |
564 | */ |
565 | public void printElements(java.io.Writer w, Element... elements) { |
566 | for (Element element : elements) |
567 | (new PrintingProcessor.PrintingElementVisitor(w, this)).visit(element).flush(); |
568 | } |
569 | |
570 | public Name getName(CharSequence cs) { |
571 | return Name.fromString(names, cs.toString()); |
572 | } |
573 | |
574 | /** |
575 | * Returns the tree node and compilation unit corresponding to this |
576 | * element, or null if they can't be found. |
577 | */ |
578 | private Pair<JCTree, JCCompilationUnit> getTreeAndTopLevel(Element e) { |
579 | Symbol sym = cast(Symbol.class, e); |
580 | Env<AttrContext> enterEnv = getEnterEnv(sym); |
581 | if (enterEnv == null) |
582 | return null; |
583 | JCTree tree = TreeInfo.declarationFor(sym, enterEnv.tree); |
584 | if (tree == null || enterEnv.toplevel == null) |
585 | return null; |
586 | return new Pair<JCTree,JCCompilationUnit>(tree, enterEnv.toplevel); |
587 | } |
588 | |
589 | /** |
590 | * Returns the best approximation for the tree node and compilation unit |
591 | * corresponding to the given element, annotation and value. |
592 | * If the element is null, null is returned. |
593 | * If the annotation is null or cannot be found, the tree node and |
594 | * compilation unit for the element is returned. |
595 | * If the annotation value is null or cannot be found, the tree node and |
596 | * compilation unit for the annotation is returned. |
597 | */ |
598 | public Pair<JCTree, JCCompilationUnit> getTreeAndTopLevel( |
599 | Element e, AnnotationMirror a, AnnotationValue v) { |
600 | if (e == null) |
601 | return null; |
602 | |
603 | Pair<JCTree, JCCompilationUnit> elemTreeTop = getTreeAndTopLevel(e); |
604 | if (elemTreeTop == null) |
605 | return null; |
606 | |
607 | if (a == null) |
608 | return elemTreeTop; |
609 | |
610 | JCTree annoTree = matchAnnoToTree(a, e, elemTreeTop.fst); |
611 | if (annoTree == null) |
612 | return elemTreeTop; |
613 | |
614 | // 6388543: if v != null, we should search within annoTree to find |
615 | // the tree matching v. For now, we ignore v and return the tree of |
616 | // the annotation. |
617 | return new Pair<JCTree, JCCompilationUnit>(annoTree, elemTreeTop.snd); |
618 | } |
619 | |
620 | /** |
621 | * Returns a symbol's enter environment, or null if it has none. |
622 | */ |
623 | private Env<AttrContext> getEnterEnv(Symbol sym) { |
624 | // Get enclosing class of sym, or sym itself if it is a class |
625 | // or package. |
626 | TypeSymbol ts = (sym.kind != Kinds.PCK) |
627 | ? sym.enclClass() |
628 | : (PackageSymbol) sym; |
629 | return (ts != null) |
630 | ? enter.getEnv(ts) |
631 | : null; |
632 | } |
633 | |
634 | /** |
635 | * Returns an object cast to the specified type. |
636 | * @throws NullPointerException if the object is {@code null} |
637 | * @throws IllegalArgumentException if the object is of the wrong type |
638 | */ |
639 | private static <T> T cast(Class<T> clazz, Object o) { |
640 | if (! clazz.isInstance(o)) |
641 | throw new IllegalArgumentException(o.toString()); |
642 | return clazz.cast(o); |
643 | } |
644 | } |