1 /*
2 * Copyright 1996-2006 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 java.lang.reflect;
27
28 import sun.reflect.MethodAccessor;
29 import sun.reflect.Reflection;
30 import sun.reflect.generics.repository.MethodRepository;
31 import sun.reflect.generics.factory.CoreReflectionFactory;
32 import sun.reflect.generics.factory.GenericsFactory;
33 import sun.reflect.generics.scope.MethodScope;
34 import sun.reflect.annotation.AnnotationType;
35 import sun.reflect.annotation.AnnotationParser;
36 import java.lang.annotation.Annotation;
37 import java.lang.annotation.AnnotationFormatError;
38 import java.nio.ByteBuffer;
39 import java.util.Map;
40
41 /**
42 * A {@code Method} provides information about, and access to, a single method
43 * on a class or interface. The reflected method may be a class method
44 * or an instance method (including an abstract method).
45 *
46 * <p>A {@code Method} permits widening conversions to occur when matching the
47 * actual parameters to invoke with the underlying method's formal
48 * parameters, but it throws an {@code IllegalArgumentException} if a
49 * narrowing conversion would occur.
50 *
51 * @see Member
52 * @see java.lang.Class
53 * @see java.lang.Class#getMethods()
54 * @see java.lang.Class#getMethod(String, Class[])
55 * @see java.lang.Class#getDeclaredMethods()
56 * @see java.lang.Class#getDeclaredMethod(String, Class[])
57 *
58 * @author Kenneth Russell
59 * @author Nakul Saraiya
60 */
61 public final
62 class Method extends AccessibleObject implements GenericDeclaration,
63 Member {
64 private Class<?> clazz;
65 private int slot;
66 // This is guaranteed to be interned by the VM in the 1.4
67 // reflection implementation
68 private String name;
69 private Class<?> returnType;
70 private Class<?>[] parameterTypes;
71 private Class<?>[] exceptionTypes;
72 private int modifiers;
73 // Generics and annotations support
74 private transient String signature;
75 // generic info repository; lazily initialized
76 private transient MethodRepository genericInfo;
77 private byte[] annotations;
78 private byte[] parameterAnnotations;
79 private byte[] annotationDefault;
80 private volatile MethodAccessor methodAccessor;
81 // For sharing of MethodAccessors. This branching structure is
82 // currently only two levels deep (i.e., one root Method and
83 // potentially many Method objects pointing to it.)
84 private Method root;
85
86 // More complicated security check cache needed here than for
87 // Class.newInstance() and Constructor.newInstance()
88 private Class<?> securityCheckCache;
89 private Class<?> securityCheckTargetClassCache;
90
91 // Generics infrastructure
92
93 private String getGenericSignature() {return signature;}
94
95 // Accessor for factory
96 private GenericsFactory getFactory() {
97 // create scope and factory
98 return CoreReflectionFactory.make(this, MethodScope.make(this));
99 }
100
101 // Accessor for generic info repository
102 private MethodRepository getGenericInfo() {
103 // lazily initialize repository if necessary
104 if (genericInfo == null) {
105 // create and cache generic info repository
106 genericInfo = MethodRepository.make(getGenericSignature(),
107 getFactory());
108 }
109 return genericInfo; //return cached repository
110 }
111
112 /**
113 * Package-private constructor used by ReflectAccess to enable
114 * instantiation of these objects in Java code from the java.lang
115 * package via sun.reflect.LangReflectAccess.
116 */
117 Method(Class<?> declaringClass,
118 String name,
119 Class<?>[] parameterTypes,
120 Class<?> returnType,
121 Class<?>[] checkedExceptions,
122 int modifiers,
123 int slot,
124 String signature,
125 byte[] annotations,
126 byte[] parameterAnnotations,
127 byte[] annotationDefault)
128 {
129 this.clazz = declaringClass;
130 this.name = name;
131 this.parameterTypes = parameterTypes;
132 this.returnType = returnType;
133 this.exceptionTypes = checkedExceptions;
134 this.modifiers = modifiers;
135 this.slot = slot;
136 this.signature = signature;
137 this.annotations = annotations;
138 this.parameterAnnotations = parameterAnnotations;
139 this.annotationDefault = annotationDefault;
140 }
141
142 /**
143 * Package-private routine (exposed to java.lang.Class via
144 * ReflectAccess) which returns a copy of this Method. The copy's
145 * "root" field points to this Method.
146 */
147 Method copy() {
148 // This routine enables sharing of MethodAccessor objects
149 // among Method objects which refer to the same underlying
150 // method in the VM. (All of this contortion is only necessary
151 // because of the "accessibility" bit in AccessibleObject,
152 // which implicitly requires that new java.lang.reflect
153 // objects be fabricated for each reflective call on Class
154 // objects.)
155 Method res = new Method(clazz, name, parameterTypes, returnType,
156 exceptionTypes, modifiers, slot, signature,
157 annotations, parameterAnnotations, annotationDefault);
158 res.root = this;
159 // Might as well eagerly propagate this if already present
160 res.methodAccessor = methodAccessor;
161 return res;
162 }
163
164 /**
165 * Returns the {@code Class} object representing the class or interface
166 * that declares the method represented by this {@code Method} object.
167 */
168 public Class<?> getDeclaringClass() {
169 return clazz;
170 }
171
172 /**
173 * Returns the name of the method represented by this {@code Method}
174 * object, as a {@code String}.
175 */
176 public String getName() {
177 return name;
178 }
179
180 /**
181 * Returns the Java language modifiers for the method represented
182 * by this {@code Method} object, as an integer. The {@code Modifier} class should
183 * be used to decode the modifiers.
184 *
185 * @see Modifier
186 */
187 public int getModifiers() {
188 return modifiers;
189 }
190
191 /**
192 * Returns an array of {@code TypeVariable} objects that represent the
193 * type variables declared by the generic declaration represented by this
194 * {@code GenericDeclaration} object, in declaration order. Returns an
195 * array of length 0 if the underlying generic declaration declares no type
196 * variables.
197 *
198 * @return an array of {@code TypeVariable} objects that represent
199 * the type variables declared by this generic declaration
200 * @throws GenericSignatureFormatError if the generic
201 * signature of this generic declaration does not conform to
202 * the format specified in the Java Virtual Machine Specification,
203 * 3rd edition
204 * @since 1.5
205 */
206 public TypeVariable<Method>[] getTypeParameters() {
207 if (getGenericSignature() != null)
208 return (TypeVariable<Method>[])getGenericInfo().getTypeParameters();
209 else
210 return (TypeVariable<Method>[])new TypeVariable[0];
211 }
212
213 /**
214 * Returns a {@code Class} object that represents the formal return type
215 * of the method represented by this {@code Method} object.
216 *
217 * @return the return type for the method this object represents
218 */
219 public Class<?> getReturnType() {
220 return returnType;
221 }
222
223 /**
224 * Returns a {@code Type} object that represents the formal return
225 * type of the method represented by this {@code Method} object.
226 *
227 * <p>If the return type is a parameterized type,
228 * the {@code Type} object returned must accurately reflect
229 * the actual type parameters used in the source code.
230 *
231 * <p>If the return type is a type variable or a parameterized type, it
232 * is created. Otherwise, it is resolved.
233 *
234 * @return a {@code Type} object that represents the formal return
235 * type of the underlying method
236 * @throws GenericSignatureFormatError
237 * if the generic method signature does not conform to the format
238 * specified in the Java Virtual Machine Specification, 3rd edition
239 * @throws TypeNotPresentException if the underlying method's
240 * return type refers to a non-existent type declaration
241 * @throws MalformedParameterizedTypeException if the
242 * underlying method's return typed refers to a parameterized
243 * type that cannot be instantiated for any reason
244 * @since 1.5
245 */
246 public Type getGenericReturnType() {
247 if (getGenericSignature() != null) {
248 return getGenericInfo().getReturnType();
249 } else { return getReturnType();}
250 }
251
252
253 /**
254 * Returns an array of {@code Class} objects that represent the formal
255 * parameter types, in declaration order, of the method
256 * represented by this {@code Method} object. Returns an array of length
257 * 0 if the underlying method takes no parameters.
258 *
259 * @return the parameter types for the method this object
260 * represents
261 */
262 public Class<?>[] getParameterTypes() {
263 return (Class<?>[]) parameterTypes.clone();
264 }
265
266 /**
267 * Returns an array of {@code Type} objects that represent the formal
268 * parameter types, in declaration order, of the method represented by
269 * this {@code Method} object. Returns an array of length 0 if the
270 * underlying method takes no parameters.
271 *
272 * <p>If a formal parameter type is a parameterized type,
273 * the {@code Type} object returned for it must accurately reflect
274 * the actual type parameters used in the source code.
275 *
276 * <p>If a formal parameter type is a type variable or a parameterized
277 * type, it is created. Otherwise, it is resolved.
278 *
279 * @return an array of Types that represent the formal
280 * parameter types of the underlying method, in declaration order
281 * @throws GenericSignatureFormatError
282 * if the generic method signature does not conform to the format
283 * specified in the Java Virtual Machine Specification, 3rd edition
284 * @throws TypeNotPresentException if any of the parameter
285 * types of the underlying method refers to a non-existent type
286 * declaration
287 * @throws MalformedParameterizedTypeException if any of
288 * the underlying method's parameter types refer to a parameterized
289 * type that cannot be instantiated for any reason
290 * @since 1.5
291 */
292 public Type[] getGenericParameterTypes() {
293 if (getGenericSignature() != null)
294 return getGenericInfo().getParameterTypes();
295 else
296 return getParameterTypes();
297 }
298
299
300 /**
301 * Returns an array of {@code Class} objects that represent
302 * the types of the exceptions declared to be thrown
303 * by the underlying method
304 * represented by this {@code Method} object. Returns an array of length
305 * 0 if the method declares no exceptions in its {@code throws} clause.
306 *
307 * @return the exception types declared as being thrown by the
308 * method this object represents
309 */
310 public Class<?>[] getExceptionTypes() {
311 return (Class<?>[]) exceptionTypes.clone();
312 }
313
314 /**
315 * Returns an array of {@code Type} objects that represent the
316 * exceptions declared to be thrown by this {@code Method} object.
317 * Returns an array of length 0 if the underlying method declares
318 * no exceptions in its {@code throws} clause.
319 *
320 * <p>If an exception type is a type variable or a parameterized
321 * type, it is created. Otherwise, it is resolved.
322 *
323 * @return an array of Types that represent the exception types
324 * thrown by the underlying method
325 * @throws GenericSignatureFormatError
326 * if the generic method signature does not conform to the format
327 * specified in the Java Virtual Machine Specification, 3rd edition
328 * @throws TypeNotPresentException if the underlying method's
329 * {@code throws} clause refers to a non-existent type declaration
330 * @throws MalformedParameterizedTypeException if
331 * the underlying method's {@code throws} clause refers to a
332 * parameterized type that cannot be instantiated for any reason
333 * @since 1.5
334 */
335 public Type[] getGenericExceptionTypes() {
336 Type[] result;
337 if (getGenericSignature() != null &&
338 ((result = getGenericInfo().getExceptionTypes()).length > 0))
339 return result;
340 else
341 return getExceptionTypes();
342 }
343
344 /**
345 * Compares this {@code Method} against the specified object. Returns
346 * true if the objects are the same. Two {@code Methods} are the same if
347 * they were declared by the same class and have the same name
348 * and formal parameter types and return type.
349 */
350 public boolean equals(Object obj) {
351 if (obj != null && obj instanceof Method) {
352 Method other = (Method)obj;
353 if ((getDeclaringClass() == other.getDeclaringClass())
354 && (getName() == other.getName())) {
355 if (!returnType.equals(other.getReturnType()))
356 return false;
357 /* Avoid unnecessary cloning */
358 Class<?>[] params1 = parameterTypes;
359 Class<?>[] params2 = other.parameterTypes;
360 if (params1.length == params2.length) {
361 for (int i = 0; i < params1.length; i++) {
362 if (params1[i] != params2[i])
363 return false;
364 }
365 return true;
366 }
367 }
368 }
369 return false;
370 }
371
372 /**
373 * Returns a hashcode for this {@code Method}. The hashcode is computed
374 * as the exclusive-or of the hashcodes for the underlying
375 * method's declaring class name and the method's name.
376 */
377 public int hashCode() {
378 return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
379 }
380
381 /**
382 * Returns a string describing this {@code Method}. The string is
383 * formatted as the method access modifiers, if any, followed by
384 * the method return type, followed by a space, followed by the
385 * class declaring the method, followed by a period, followed by
386 * the method name, followed by a parenthesized, comma-separated
387 * list of the method's formal parameter types. If the method
388 * throws checked exceptions, the parameter list is followed by a
389 * space, followed by the word throws followed by a
390 * comma-separated list of the thrown exception types.
391 * For example:
392 * <pre>
393 * public boolean java.lang.Object.equals(java.lang.Object)
394 * </pre>
395 *
396 * <p>The access modifiers are placed in canonical order as
397 * specified by "The Java Language Specification". This is
398 * {@code public}, {@code protected} or {@code private} first,
399 * and then other modifiers in the following order:
400 * {@code abstract}, {@code static}, {@code final},
401 * {@code synchronized}, {@code native}, {@code strictfp}.
402 */
403 public String toString() {
404 try {
405 StringBuffer sb = new StringBuffer();
406 int mod = getModifiers() & Modifier.methodModifiers();
407 if (mod != 0) {
408 sb.append(Modifier.toString(mod) + " ");
409 }
410 sb.append(Field.getTypeName(getReturnType()) + " ");
411 sb.append(Field.getTypeName(getDeclaringClass()) + ".");
412 sb.append(getName() + "(");
413 Class<?>[] params = parameterTypes; // avoid clone
414 for (int j = 0; j < params.length; j++) {
415 sb.append(Field.getTypeName(params[j]));
416 if (j < (params.length - 1))
417 sb.append(",");
418 }
419 sb.append(")");
420 Class<?>[] exceptions = exceptionTypes; // avoid clone
421 if (exceptions.length > 0) {
422 sb.append(" throws ");
423 for (int k = 0; k < exceptions.length; k++) {
424 sb.append(exceptions[k].getName());
425 if (k < (exceptions.length - 1))
426 sb.append(",");
427 }
428 }
429 return sb.toString();
430 } catch (Exception e) {
431 return "<" + e + ">";
432 }
433 }
434
435 /**
436 * Returns a string describing this {@code Method}, including
437 * type parameters. The string is formatted as the method access
438 * modifiers, if any, followed by an angle-bracketed
439 * comma-separated list of the method's type parameters, if any,
440 * followed by the method's generic return type, followed by a
441 * space, followed by the class declaring the method, followed by
442 * a period, followed by the method name, followed by a
443 * parenthesized, comma-separated list of the method's generic
444 * formal parameter types.
445 *
446 * If this method was declared to take a variable number of
447 * arguments, instead of denoting the last parameter as
448 * "<tt><i>Type</i>[]</tt>", it is denoted as
449 * "<tt><i>Type</i>...</tt>".
450 *
451 * A space is used to separate access modifiers from one another
452 * and from the type parameters or return type. If there are no
453 * type parameters, the type parameter list is elided; if the type
454 * parameter list is present, a space separates the list from the
455 * class name. If the method is declared to throw exceptions, the
456 * parameter list is followed by a space, followed by the word
457 * throws followed by a comma-separated list of the generic thrown
458 * exception types. If there are no type parameters, the type
459 * parameter list is elided.
460 *
461 * <p>The access modifiers are placed in canonical order as
462 * specified by "The Java Language Specification". This is
463 * {@code public}, {@code protected} or {@code private} first,
464 * and then other modifiers in the following order:
465 * {@code abstract}, {@code static}, {@code final},
466 * {@code synchronized}, {@code native}, {@code strictfp}.
467 *
468 * @return a string describing this {@code Method},
469 * include type parameters
470 *
471 * @since 1.5
472 */
473 public String toGenericString() {
474 try {
475 StringBuilder sb = new StringBuilder();
476 int mod = getModifiers() & Modifier.methodModifiers();
477 if (mod != 0) {
478 sb.append(Modifier.toString(mod) + " ");
479 }
480 TypeVariable<?>[] typeparms = getTypeParameters();
481 if (typeparms.length > 0) {
482 boolean first = true;
483 sb.append("<");
484 for(TypeVariable<?> typeparm: typeparms) {
485 if (!first)
486 sb.append(",");
487 // Class objects can't occur here; no need to test
488 // and call Class.getName().
489 sb.append(typeparm.toString());
490 first = false;
491 }
492 sb.append("> ");
493 }
494
495 Type genRetType = getGenericReturnType();
496 sb.append( ((genRetType instanceof Class<?>)?
497 Field.getTypeName((Class<?>)genRetType):genRetType.toString()) + " ");
498
499 sb.append(Field.getTypeName(getDeclaringClass()) + ".");
500 sb.append(getName() + "(");
501 Type[] params = getGenericParameterTypes();
502 for (int j = 0; j < params.length; j++) {
503 String param = (params[j] instanceof Class)?
504 Field.getTypeName((Class)params[j]):
505 (params[j].toString());
506 if (isVarArgs() && (j == params.length - 1)) // replace T[] with T...
507 param = param.replaceFirst("\\[\\]$", "...");
508 sb.append(param);
509 if (j < (params.length - 1))
510 sb.append(",");
511 }
512 sb.append(")");
513 Type[] exceptions = getGenericExceptionTypes();
514 if (exceptions.length > 0) {
515 sb.append(" throws ");
516 for (int k = 0; k < exceptions.length; k++) {
517 sb.append((exceptions[k] instanceof Class)?
518 ((Class)exceptions[k]).getName():
519 exceptions[k].toString());
520 if (k < (exceptions.length - 1))
521 sb.append(",");
522 }
523 }
524 return sb.toString();
525 } catch (Exception e) {
526 return "<" + e + ">";
527 }
528 }
529
530 /**
531 * Invokes the underlying method represented by this {@code Method}
532 * object, on the specified object with the specified parameters.
533 * Individual parameters are automatically unwrapped to match
534 * primitive formal parameters, and both primitive and reference
535 * parameters are subject to method invocation conversions as
536 * necessary.
537 *
538 * <p>If the underlying method is static, then the specified {@code obj}
539 * argument is ignored. It may be null.
540 *
541 * <p>If the number of formal parameters required by the underlying method is
542 * 0, the supplied {@code args} array may be of length 0 or null.
543 *
544 * <p>If the underlying method is an instance method, it is invoked
545 * using dynamic method lookup as documented in The Java Language
546 * Specification, Second Edition, section 15.12.4.4; in particular,
547 * overriding based on the runtime type of the target object will occur.
548 *
549 * <p>If the underlying method is static, the class that declared
550 * the method is initialized if it has not already been initialized.
551 *
552 * <p>If the method completes normally, the value it returns is
553 * returned to the caller of invoke; if the value has a primitive
554 * type, it is first appropriately wrapped in an object. However,
555 * if the value has the type of an array of a primitive type, the
556 * elements of the array are <i>not</i> wrapped in objects; in
557 * other words, an array of primitive type is returned. If the
558 * underlying method return type is void, the invocation returns
559 * null.
560 *
561 * @param obj the object the underlying method is invoked from
562 * @param args the arguments used for the method call
563 * @return the result of dispatching the method represented by
564 * this object on {@code obj} with parameters
565 * {@code args}
566 *
567 * @exception IllegalAccessException if this {@code Method} object
568 * enforces Java language access control and the underlying
569 * method is inaccessible.
570 * @exception IllegalArgumentException if the method is an
571 * instance method and the specified object argument
572 * is not an instance of the class or interface
573 * declaring the underlying method (or of a subclass
574 * or implementor thereof); if the number of actual
575 * and formal parameters differ; if an unwrapping
576 * conversion for primitive arguments fails; or if,
577 * after possible unwrapping, a parameter value
578 * cannot be converted to the corresponding formal
579 * parameter type by a method invocation conversion.
580 * @exception InvocationTargetException if the underlying method
581 * throws an exception.
582 * @exception NullPointerException if the specified object is null
583 * and the method is an instance method.
584 * @exception ExceptionInInitializerError if the initialization
585 * provoked by this method fails.
586 */
587 public Object invoke(Object obj, Object... args)
588 throws IllegalAccessException, IllegalArgumentException,
589 InvocationTargetException
590 {
591 if (!override) {
592 if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) {
593 Class<?> caller = Reflection.getCallerClass(1);
594 Class<?> targetClass = ((obj == null || !Modifier.isProtected(modifiers))
595 ? clazz
596 : obj.getClass());
597
598 boolean cached;
599 synchronized (this) {
600 cached = (securityCheckCache == caller)
601 && (securityCheckTargetClassCache == targetClass);
602 }
603 if (!cached) {
604 Reflection.ensureMemberAccess(caller, clazz, obj, modifiers);
605 synchronized (this) {
606 securityCheckCache = caller;
607 securityCheckTargetClassCache = targetClass;
608 }
609 }
610 }
611 }
612 if (methodAccessor == null) acquireMethodAccessor();
613 return methodAccessor.invoke(obj, args);
614 }
615
616 /**
617 * Returns {@code true} if this method is a bridge
618 * method; returns {@code false} otherwise.
619 *
620 * @return true if and only if this method is a bridge
621 * method as defined by the Java Language Specification.
622 * @since 1.5
623 */
624 public boolean isBridge() {
625 return (getModifiers() & Modifier.BRIDGE) != 0;
626 }
627
628 /**
629 * Returns {@code true} if this method was declared to take
630 * a variable number of arguments; returns {@code false}
631 * otherwise.
632 *
633 * @return {@code true} if an only if this method was declared to
634 * take a variable number of arguments.
635 * @since 1.5
636 */
637 public boolean isVarArgs() {
638 return (getModifiers() & Modifier.VARARGS) != 0;
639 }
640
641 /**
642 * Returns {@code true} if this method is a synthetic
643 * method; returns {@code false} otherwise.
644 *
645 * @return true if and only if this method is a synthetic
646 * method as defined by the Java Language Specification.
647 * @since 1.5
648 */
649 public boolean isSynthetic() {
650 return Modifier.isSynthetic(getModifiers());
651 }
652
653 // NOTE that there is no synchronization used here. It is correct
654 // (though not efficient) to generate more than one MethodAccessor
655 // for a given Method. However, avoiding synchronization will
656 // probably make the implementation more scalable.
657 private void acquireMethodAccessor() {
658 // First check to see if one has been created yet, and take it
659 // if so
660 MethodAccessor tmp = null;
661 if (root != null) tmp = root.getMethodAccessor();
662 if (tmp != null) {
663 methodAccessor = tmp;
664 return;
665 }
666 // Otherwise fabricate one and propagate it up to the root
667 tmp = reflectionFactory.newMethodAccessor(this);
668 setMethodAccessor(tmp);
669 }
670
671 // Returns MethodAccessor for this Method object, not looking up
672 // the chain to the root
673 MethodAccessor getMethodAccessor() {
674 return methodAccessor;
675 }
676
677 // Sets the MethodAccessor for this Method object and
678 // (recursively) its root
679 void setMethodAccessor(MethodAccessor accessor) {
680 methodAccessor = accessor;
681 // Propagate up
682 if (root != null) {
683 root.setMethodAccessor(accessor);
684 }
685 }
686
687 /**
688 * @throws NullPointerException {@inheritDoc}
689 * @since 1.5
690 */
691 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
692 if (annotationClass == null)
693 throw new NullPointerException();
694
695 return (T) declaredAnnotations().get(annotationClass);
696 }
697
698 /**
699 * @since 1.5
700 */
701 public Annotation[] getDeclaredAnnotations() {
702 return AnnotationParser.toArray(declaredAnnotations());
703 }
704
705 private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
706
707 private synchronized Map<Class<? extends Annotation>, Annotation> declaredAnnotations() {
708 if (declaredAnnotations == null) {
709 declaredAnnotations = AnnotationParser.parseAnnotations(
710 annotations, sun.misc.SharedSecrets.getJavaLangAccess().
711 getConstantPool(getDeclaringClass()),
712 getDeclaringClass());
713 }
714 return declaredAnnotations;
715 }
716
717 /**
718 * Returns the default value for the annotation member represented by
719 * this {@code Method} instance. If the member is of a primitive type,
720 * an instance of the corresponding wrapper type is returned. Returns
721 * null if no default is associated with the member, or if the method
722 * instance does not represent a declared member of an annotation type.
723 *
724 * @return the default value for the annotation member represented
725 * by this {@code Method} instance.
726 * @throws TypeNotPresentException if the annotation is of type
727 * {@link Class} and no definition can be found for the
728 * default class value.
729 * @since 1.5
730 */
731 public Object getDefaultValue() {
732 if (annotationDefault == null)
733 return null;
734 Class<?> memberType = AnnotationType.invocationHandlerReturnType(
735 getReturnType());
736 Object result = AnnotationParser.parseMemberValue(
737 memberType, ByteBuffer.wrap(annotationDefault),
738 sun.misc.SharedSecrets.getJavaLangAccess().
739 getConstantPool(getDeclaringClass()),
740 getDeclaringClass());
741 if (result instanceof sun.reflect.annotation.ExceptionProxy)
742 throw new AnnotationFormatError("Invalid default: " + this);
743 return result;
744 }
745
746 /**
747 * Returns an array of arrays that represent the annotations on the formal
748 * parameters, in declaration order, of the method represented by
749 * this {@code Method} object. (Returns an array of length zero if the
750 * underlying method is parameterless. If the method has one or more
751 * parameters, a nested array of length zero is returned for each parameter
752 * with no annotations.) The annotation objects contained in the returned
753 * arrays are serializable. The caller of this method is free to modify
754 * the returned arrays; it will have no effect on the arrays returned to
755 * other callers.
756 *
757 * @return an array of arrays that represent the annotations on the formal
758 * parameters, in declaration order, of the method represented by this
759 * Method object
760 * @since 1.5
761 */
762 public Annotation[][] getParameterAnnotations() {
763 int numParameters = parameterTypes.length;
764 if (parameterAnnotations == null)
765 return new Annotation[numParameters][0];
766
767 Annotation[][] result = AnnotationParser.parseParameterAnnotations(
768 parameterAnnotations,
769 sun.misc.SharedSecrets.getJavaLangAccess().
770 getConstantPool(getDeclaringClass()),
771 getDeclaringClass());
772 if (result.length != numParameters)
773 throw new java.lang.annotation.AnnotationFormatError(
774 "Parameter annotations don't match number of parameters");
775 return result;
776 }
777 }