1 /*
2 * Copyright (c) 2012, 2023, 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
26 package java.lang.reflect;
27
28 import java.lang.annotation.Annotation;
29 import java.util.Arrays;
30 import java.util.Map;
31 import java.util.Set;
32 import java.util.Objects;
33 import java.util.StringJoiner;
34 import java.util.stream.Collectors;
35
36 import jdk.internal.access.SharedSecrets;
37 import jdk.internal.vm.annotation.Stable;
38 import sun.reflect.annotation.AnnotationParser;
39 import sun.reflect.annotation.AnnotationSupport;
40 import sun.reflect.annotation.TypeAnnotationParser;
41 import sun.reflect.annotation.TypeAnnotation;
42 import sun.reflect.generics.reflectiveObjects.ParameterizedTypeImpl;
43 import sun.reflect.generics.repository.ConstructorRepository;
44
45 /**
46 * A shared superclass for the common functionality of {@link Method}
47 * and {@link Constructor}.
48 *
49 * @sealedGraph
50 * @since 1.8
51 */
52 public abstract sealed class Executable extends AccessibleObject
53 implements Member, GenericDeclaration permits Constructor, Method {
54 /*
55 * Only grant package-visibility to the constructor.
56 */
57 @SuppressWarnings("deprecation")
58 Executable() {}
59
60 /**
61 * Accessor method to allow code sharing
62 */
63 abstract byte[] getAnnotationBytes();
64
65 /**
66 * Does the Executable have generic information.
67 */
68 abstract boolean hasGenericInformation();
69
70 abstract ConstructorRepository getGenericInfo();
71
72 boolean equalParamTypes(Class<?>[] params1, Class<?>[] params2) {
73 /* Avoid unnecessary cloning */
74 if (params1.length == params2.length) {
75 for (int i = 0; i < params1.length; i++) {
76 if (params1[i] != params2[i])
77 return false;
78 }
79 return true;
80 }
81 return false;
82 }
83
84 Annotation[][] parseParameterAnnotations(byte[] parameterAnnotations) {
85 return AnnotationParser.parseParameterAnnotations(
86 parameterAnnotations,
87 SharedSecrets.getJavaLangAccess().
88 getConstantPool(getDeclaringClass()),
89 getDeclaringClass());
90 }
91
92 void printModifiersIfNonzero(StringBuilder sb, int mask, boolean isDefault) {
93 int mod = getModifiers() & mask;
94
95 if (mod != 0 && !isDefault) {
96 sb.append(Modifier.toString(mod)).append(' ');
97 } else {
98 int access_mod = mod & Modifier.ACCESS_MODIFIERS;
99 if (access_mod != 0)
100 sb.append(Modifier.toString(access_mod)).append(' ');
101 if (isDefault)
102 sb.append("default ");
103 mod = (mod & ~Modifier.ACCESS_MODIFIERS);
104 if (mod != 0)
105 sb.append(Modifier.toString(mod)).append(' ');
106 }
107 }
108
109 String sharedToString(int modifierMask,
110 boolean isDefault,
111 Class<?>[] parameterTypes,
112 Class<?>[] exceptionTypes) {
113 try {
114 StringBuilder sb = new StringBuilder();
115
116 printModifiersIfNonzero(sb, modifierMask, isDefault);
117 specificToStringHeader(sb);
118 sb.append(Arrays.stream(parameterTypes)
119 .map(Type::getTypeName)
120 .collect(Collectors.joining(",", "(", ")")));
121 if (exceptionTypes.length > 0) {
122 sb.append(Arrays.stream(exceptionTypes)
123 .map(Type::getTypeName)
124 .collect(Collectors.joining(",", " throws ", "")));
125 }
126 return sb.toString();
127 } catch (Exception e) {
128 return "<" + e + ">";
129 }
130 }
131
132 /**
133 * Generate toString header information specific to a method or
134 * constructor.
135 */
136 abstract void specificToStringHeader(StringBuilder sb);
137
138 static String typeVarBounds(TypeVariable<?> typeVar) {
139 Type[] bounds = typeVar.getBounds();
140 if (bounds.length == 1 && bounds[0].equals(Object.class)) {
141 return typeVar.getName();
142 } else {
143 return typeVar.getName() + " extends " +
144 Arrays.stream(bounds)
145 .map(Type::getTypeName)
146 .collect(Collectors.joining(" & "));
147 }
148 }
149
150 String sharedToGenericString(int modifierMask, boolean isDefault) {
151 try {
152 StringBuilder sb = new StringBuilder();
153
154 printModifiersIfNonzero(sb, modifierMask, isDefault);
155
156 TypeVariable<?>[] typeparms = getTypeParameters();
157 if (typeparms.length > 0) {
158 sb.append(Arrays.stream(typeparms)
159 .map(Executable::typeVarBounds)
160 .collect(Collectors.joining(",", "<", "> ")));
161 }
162
163 specificToGenericStringHeader(sb);
164
165 sb.append('(');
166 StringJoiner sj = new StringJoiner(",");
167 Type[] params = getGenericParameterTypes();
168 for (int j = 0; j < params.length; j++) {
169 String param = params[j].getTypeName();
170 if (isVarArgs() && (j == params.length - 1)) // replace T[] with T...
171 param = param.replaceFirst("\\[\\]$", "...");
172 sj.add(param);
173 }
174 sb.append(sj.toString());
175 sb.append(')');
176
177 Type[] exceptionTypes = getGenericExceptionTypes();
178 if (exceptionTypes.length > 0) {
179 sb.append(Arrays.stream(exceptionTypes)
180 .map(Type::getTypeName)
181 .collect(Collectors.joining(",", " throws ", "")));
182 }
183 return sb.toString();
184 } catch (Exception e) {
185 return "<" + e + ">";
186 }
187 }
188
189 /**
190 * Generate toGenericString header information specific to a
191 * method or constructor.
192 */
193 abstract void specificToGenericStringHeader(StringBuilder sb);
194
195 /**
196 * Returns the {@code Class} object representing the class or interface
197 * that declares the executable represented by this object.
198 */
199 public abstract Class<?> getDeclaringClass();
200
201 /**
202 * Returns the name of the executable represented by this object.
203 */
204 public abstract String getName();
205
206 /**
207 * {@return the Java language {@linkplain Modifier modifiers} for
208 * the executable represented by this object}
209 * @see #accessFlags
210 */
211 public abstract int getModifiers();
212
213 /**
214 * {@return an unmodifiable set of the {@linkplain AccessFlag
215 * access flags} for the executable represented by this object,
216 * possibly empty}
217 *
218 * @see #getModifiers()
219 * @jvms 4.6 Methods
220 * @since 20
221 */
222 @Override
223 public Set<AccessFlag> accessFlags() {
224 return AccessFlag.maskToAccessFlags(getModifiers(),
225 AccessFlag.Location.METHOD);
226 }
227
228 /**
229 * Returns an array of {@code TypeVariable} objects that represent the
230 * type variables declared by the generic declaration represented by this
231 * {@code GenericDeclaration} object, in declaration order. Returns an
232 * array of length 0 if the underlying generic declaration declares no type
233 * variables.
234 *
235 * @return an array of {@code TypeVariable} objects that represent
236 * the type variables declared by this generic declaration
237 * @throws GenericSignatureFormatError if the generic
238 * signature of this generic declaration does not conform to
239 * the format specified in
240 * <cite>The Java Virtual Machine Specification</cite>
241 */
242 public abstract TypeVariable<?>[] getTypeParameters();
243
244 // returns shared array of parameter types - must never give it out
245 // to the untrusted code...
246 abstract Class<?>[] getSharedParameterTypes();
247
248 // returns shared array of exception types - must never give it out
249 // to the untrusted code...
250 abstract Class<?>[] getSharedExceptionTypes();
251
252 /**
253 * Returns an array of {@code Class} objects that represent the formal
254 * parameter types, in declaration order, of the executable
255 * represented by this object. Returns an array of length
256 * 0 if the underlying executable takes no parameters.
257 * Note that the constructors of some inner classes
258 * may have an implicitly declared parameter in addition to
259 * explicitly declared ones.
260 *
261 * @return the parameter types for the executable this object
262 * represents
263 */
264 public abstract Class<?>[] getParameterTypes();
265
266 /**
267 * Returns the number of formal parameters (whether explicitly
268 * declared or implicitly declared or neither) for the executable
269 * represented by this object.
270 *
271 * @return The number of formal parameters for the executable this
272 * object represents
273 */
274 public abstract int getParameterCount();
275
276 /**
277 * Returns an array of {@code Type} objects that represent the
278 * formal parameter types, in declaration order, of the executable
279 * represented by this object. An array of length 0 is returned if the
280 * underlying executable takes no parameters. Note that the
281 * constructors of some inner classes may have an implicitly
282 * declared parameter in addition to explicitly declared ones.
283 * Also note that as a <a
284 * href="{@docRoot}/java.base/java/lang/reflect/package-summary.html#LanguageJvmModel">modeling
285 * artifact</a>, the number of returned parameters can differ
286 * depending on whether or not generic information is present. If
287 * generic information is present, only parameters explicitly
288 * present in the source will be returned; if generic information
289 * is not present, implicit and synthetic parameters may be
290 * returned as well.
291 *
292 * <p>If a formal parameter type is a parameterized type,
293 * the {@code Type} object returned for it must accurately reflect
294 * the actual type arguments used in the source code.
295 *
296 * <p>If a formal parameter type is a type variable or a parameterized
297 * type, it is created. Otherwise, it is resolved.
298 *
299 * @return an array of {@code Type}s that represent the formal
300 * parameter types of the underlying executable, in declaration order
301 * @throws GenericSignatureFormatError
302 * if the generic method signature does not conform to the format
303 * specified in
304 * <cite>The Java Virtual Machine Specification</cite>
305 * @throws TypeNotPresentException if any of the parameter
306 * types of the underlying executable refers to a non-existent type
307 * declaration
308 * @throws MalformedParameterizedTypeException if any of
309 * the underlying executable's parameter types refer to a parameterized
310 * type that cannot be instantiated for any reason
311 */
312 public Type[] getGenericParameterTypes() {
313 if (hasGenericInformation())
314 return getGenericInfo().getParameterTypes();
315 else
316 return getParameterTypes();
317 }
318
319 /**
320 * Behaves like {@code getGenericParameterTypes}, but returns type
321 * information for all parameters, including synthetic parameters.
322 */
323 Type[] getAllGenericParameterTypes() {
324 final boolean genericInfo = hasGenericInformation();
325
326 // Easy case: we don't have generic parameter information. In
327 // this case, we just return the result of
328 // getParameterTypes().
329 if (!genericInfo) {
330 return getParameterTypes();
331 } else {
332 final boolean realParamData = hasRealParameterData();
333 final Type[] genericParamTypes = getGenericParameterTypes();
334 final Type[] nonGenericParamTypes = getSharedParameterTypes();
335 // If we have real parameter data, then we use the
336 // synthetic and mandate flags to our advantage.
337 if (realParamData) {
338 final Type[] out = new Type[nonGenericParamTypes.length];
339 final Parameter[] params = getParameters();
340 int fromidx = 0;
341 for (int i = 0; i < out.length; i++) {
342 final Parameter param = params[i];
343 if (param.isSynthetic() || param.isImplicit()) {
344 // If we hit a synthetic or mandated parameter,
345 // use the non generic parameter info.
346 out[i] = nonGenericParamTypes[i];
347 } else {
348 // Otherwise, use the generic parameter info.
349 out[i] = genericParamTypes[fromidx];
350 fromidx++;
351 }
352 }
353 return out;
354 } else {
355 // Otherwise, use the non-generic parameter data.
356 // Without method parameter reflection data, we have
357 // no way to figure out which parameters are
358 // synthetic/mandated, thus, no way to match up the
359 // indexes.
360 return genericParamTypes.length == nonGenericParamTypes.length ?
361 genericParamTypes : getParameterTypes();
362 }
363 }
364 }
365
366 /**
367 * {@return an array of {@code Parameter} objects representing
368 * all the parameters to the underlying executable represented by
369 * this object} An array of length 0 is returned if the executable
370 * has no parameters.
371 *
372 * <p>The parameters of the underlying executable do not necessarily
373 * have unique names, or names that are legal identifiers in the
374 * Java programming language (JLS {@jls 3.8}).
375 *
376 * @throws MalformedParametersException if the class file contains
377 * a MethodParameters attribute that is improperly formatted.
378 */
379 public Parameter[] getParameters() {
380 // TODO: This may eventually need to be guarded by security
381 // mechanisms similar to those in Field, Method, etc.
382 //
383 // Need to copy the cached array to prevent users from messing
384 // with it. Since parameters are immutable, we can
385 // shallow-copy.
386 return parameterData().parameters.clone();
387 }
388
389 private Parameter[] synthesizeAllParams() {
390 final int realparams = getParameterCount();
391 final Parameter[] out = new Parameter[realparams];
392 for (int i = 0; i < realparams; i++)
393 // TODO: is there a way to synthetically derive the
394 // modifiers? Probably not in the general case, since
395 // we'd have no way of knowing about them, but there
396 // may be specific cases.
397 out[i] = new Parameter("arg" + i, 0, this, i);
398 return out;
399 }
400
401 private void verifyParameters(final Parameter[] parameters) {
402 final int mask = Modifier.FINAL | Modifier.SYNTHETIC | Modifier.MANDATED;
403
404 if (getParameterCount() != parameters.length)
405 throw new MalformedParametersException("Wrong number of parameters in MethodParameters attribute");
406
407 for (Parameter parameter : parameters) {
408 final String name = parameter.getRealName();
409 final int mods = parameter.getModifiers();
410
411 if (name != null) {
412 if (name.isEmpty() || name.indexOf('.') != -1 ||
413 name.indexOf(';') != -1 || name.indexOf('[') != -1 ||
414 name.indexOf('/') != -1) {
415 throw new MalformedParametersException("Invalid parameter name \"" + name + "\"");
416 }
417 }
418
419 if (mods != (mods & mask)) {
420 throw new MalformedParametersException("Invalid parameter modifiers");
421 }
422 }
423 }
424
425
426 boolean hasRealParameterData() {
427 return parameterData().isReal;
428 }
429
430 private ParameterData parameterData() {
431 ParameterData parameterData = this.parameterData;
432 if (parameterData != null) {
433 return parameterData;
434 }
435
436 Parameter[] tmp;
437 // Go to the JVM to get them
438 try {
439 tmp = getParameters0();
440 } catch (IllegalArgumentException e) {
441 // Rethrow ClassFormatErrors
442 throw new MalformedParametersException("Invalid constant pool index");
443 }
444
445 // If we get back nothing, then synthesize parameters
446 if (tmp == null) {
447 tmp = synthesizeAllParams();
448 parameterData = new ParameterData(tmp, false);
449 } else {
450 verifyParameters(tmp);
451 parameterData = new ParameterData(tmp, true);
452 }
453 return this.parameterData = parameterData;
454 }
455
456 private transient @Stable ParameterData parameterData;
457
458 record ParameterData(@Stable Parameter[] parameters, boolean isReal) {}
459
460 private native Parameter[] getParameters0();
461 native byte[] getTypeAnnotationBytes0();
462
463 // Needed by reflectaccess
464 byte[] getTypeAnnotationBytes() {
465 return getTypeAnnotationBytes0();
466 }
467
468 /**
469 * Returns an array of {@code Class} objects that represent the
470 * types of exceptions declared to be thrown by the underlying
471 * executable represented by this object. Returns an array of
472 * length 0 if the executable declares no exceptions in its {@code
473 * throws} clause.
474 *
475 * @return the exception types declared as being thrown by the
476 * executable this object represents
477 */
478 public abstract Class<?>[] getExceptionTypes();
479
480 /**
481 * Returns an array of {@code Type} objects that represent the
482 * exceptions declared to be thrown by this executable object.
483 * Returns an array of length 0 if the underlying executable declares
484 * no exceptions in its {@code throws} clause.
485 *
486 * <p>If an exception type is a type variable or a parameterized
487 * type, it is created. Otherwise, it is resolved.
488 *
489 * @return an array of Types that represent the exception types
490 * thrown by the underlying executable
491 * @throws GenericSignatureFormatError
492 * if the generic method signature does not conform to the format
493 * specified in
494 * <cite>The Java Virtual Machine Specification</cite>
495 * @throws TypeNotPresentException if the underlying executable's
496 * {@code throws} clause refers to a non-existent type declaration
497 * @throws MalformedParameterizedTypeException if
498 * the underlying executable's {@code throws} clause refers to a
499 * parameterized type that cannot be instantiated for any reason
500 */
501 public Type[] getGenericExceptionTypes() {
502 Type[] result;
503 if (hasGenericInformation() &&
504 ((result = getGenericInfo().getExceptionTypes()).length > 0))
505 return result;
506 else
507 return getExceptionTypes();
508 }
509
510 /**
511 * {@return a string describing this {@code Executable}, including
512 * any type parameters}
513 */
514 public abstract String toGenericString();
515
516 /**
517 * {@return {@code true} if this executable was declared to take a
518 * variable number of arguments; returns {@code false} otherwise}
519 */
520 public boolean isVarArgs() {
521 return (getModifiers() & Modifier.VARARGS) != 0;
522 }
523
524 /**
525 * Returns {@code true} if this executable is a synthetic
526 * construct; returns {@code false} otherwise.
527 *
528 * @return true if and only if this executable is a synthetic
529 * construct as defined by
530 * <cite>The Java Language Specification</cite>.
531 * @jls 13.1 The Form of a Binary
532 * @jvms 4.6 Methods
533 */
534 public boolean isSynthetic() {
535 return Modifier.isSynthetic(getModifiers());
536 }
537
538 /**
539 * Returns an array of arrays of {@code Annotation}s that
540 * represent the annotations on the formal parameters, in
541 * declaration order, of the {@code Executable} represented by
542 * this object. Synthetic and mandated parameters (see
543 * explanation below), such as the outer "this" parameter to an
544 * inner class constructor will be represented in the returned
545 * array. If the executable has no parameters (meaning no formal,
546 * no synthetic, and no mandated parameters), a zero-length array
547 * will be returned. If the {@code Executable} has one or more
548 * parameters, a nested array of length zero is returned for each
549 * parameter with no annotations. The annotation objects contained
550 * in the returned arrays are serializable. The caller of this
551 * method is free to modify the returned arrays; it will have no
552 * effect on the arrays returned to other callers.
553 *
554 * A compiler may add extra parameters that are implicitly
555 * declared in source ("mandated"), as well as parameters that
556 * are neither implicitly nor explicitly declared in source
557 * ("synthetic") to the parameter list for a method. See {@link
558 * java.lang.reflect.Parameter} for more information.
559 *
560 * <p>Note that any annotations returned by this method are
561 * declaration annotations.
562 *
563 * @see java.lang.reflect.Parameter
564 * @see java.lang.reflect.Parameter#getAnnotations
565 * @return an array of arrays that represent the annotations on
566 * the formal and implicit parameters, in declaration order, of
567 * the executable represented by this object
568 */
569 public abstract Annotation[][] getParameterAnnotations();
570
571 Annotation[][] sharedGetParameterAnnotations(Class<?>[] parameterTypes,
572 byte[] parameterAnnotations) {
573 int numParameters = parameterTypes.length;
574 if (parameterAnnotations == null)
575 return new Annotation[numParameters][0];
576
577 Annotation[][] result = parseParameterAnnotations(parameterAnnotations);
578
579 if (result.length != numParameters &&
580 handleParameterNumberMismatch(result.length, parameterTypes)) {
581 Annotation[][] tmp = new Annotation[numParameters][];
582 // Shift annotations down to account for any implicit leading parameters
583 System.arraycopy(result, 0, tmp, numParameters - result.length, result.length);
584 for (int i = 0; i < numParameters - result.length; i++) {
585 tmp[i] = new Annotation[0];
586 }
587 result = tmp;
588 }
589 return result;
590 }
591
592 abstract boolean handleParameterNumberMismatch(int resultLength, Class<?>[] parameterTypes);
593
594 /**
595 * {@inheritDoc}
596 * @throws NullPointerException {@inheritDoc}
597 */
598 @Override
599 public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
600 Objects.requireNonNull(annotationClass);
601 return annotationClass.cast(declaredAnnotations().get(annotationClass));
602 }
603
604 /**
605 * {@inheritDoc}
606 *
607 * @throws NullPointerException {@inheritDoc}
608 */
609 @Override
610 public <T extends Annotation> T[] getAnnotationsByType(Class<T> annotationClass) {
611 Objects.requireNonNull(annotationClass);
612
613 return AnnotationSupport.getDirectlyAndIndirectlyPresent(declaredAnnotations(), annotationClass);
614 }
615
616 /**
617 * {@inheritDoc}
618 */
619 @Override
620 public Annotation[] getDeclaredAnnotations() {
621 return AnnotationParser.toArray(declaredAnnotations());
622 }
623
624 private transient volatile Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
625
626 private Map<Class<? extends Annotation>, Annotation> declaredAnnotations() {
627 Map<Class<? extends Annotation>, Annotation> declAnnos;
628 if ((declAnnos = declaredAnnotations) == null) {
629 synchronized (this) {
630 if ((declAnnos = declaredAnnotations) == null) {
631 Executable root = (Executable)getRoot();
632 if (root != null) {
633 declAnnos = root.declaredAnnotations();
634 } else {
635 declAnnos = AnnotationParser.parseAnnotations(
636 getAnnotationBytes(),
637 SharedSecrets.getJavaLangAccess().
638 getConstantPool(getDeclaringClass()),
639 getDeclaringClass()
640 );
641 }
642 declaredAnnotations = declAnnos;
643 }
644 }
645 }
646 return declAnnos;
647 }
648
649 /**
650 * Returns an {@code AnnotatedType} object that represents the use of a type to
651 * specify the return type of the method/constructor represented by this
652 * Executable.
653 *
654 * If this {@code Executable} object represents a constructor, the {@code
655 * AnnotatedType} object represents the type of the constructed object.
656 *
657 * If this {@code Executable} object represents a method, the {@code
658 * AnnotatedType} object represents the use of a type to specify the return
659 * type of the method.
660 *
661 * @return an object representing the return type of the method
662 * or constructor represented by this {@code Executable}
663 */
664 public abstract AnnotatedType getAnnotatedReturnType();
665
666 /* Helper for subclasses of Executable.
667 *
668 * Returns an AnnotatedType object that represents the use of a type to
669 * specify the return type of the method/constructor represented by this
670 * Executable.
671 */
672 AnnotatedType getAnnotatedReturnType0(Type returnType) {
673 return TypeAnnotationParser.buildAnnotatedType(getTypeAnnotationBytes0(),
674 SharedSecrets.getJavaLangAccess().
675 getConstantPool(getDeclaringClass()),
676 this,
677 getDeclaringClass(),
678 returnType,
679 TypeAnnotation.TypeAnnotationTarget.METHOD_RETURN);
680 }
681
682 /**
683 * Returns an {@code AnnotatedType} object that represents the use of a
684 * type to specify the receiver type of the method/constructor represented
685 * by this {@code Executable} object.
686 *
687 * The receiver type of a method/constructor is available only if the
688 * method/constructor has a receiver parameter (JLS {@jls 8.4.1}). If this {@code
689 * Executable} object <em>represents an instance method or represents a
690 * constructor of an inner member class</em>, and the
691 * method/constructor <em>either</em> has no receiver parameter or has a
692 * receiver parameter with no annotations on its type, then the return
693 * value is an {@code AnnotatedType} object representing an element with no
694 * annotations.
695 *
696 * If this {@code Executable} object represents a static method or
697 * represents a constructor of a top level, static member, local, or
698 * anonymous class, then the return value is null.
699 *
700 * @return an object representing the receiver type of the method or
701 * constructor represented by this {@code Executable} or {@code null} if
702 * this {@code Executable} can not have a receiver parameter
703 *
704 * @jls 8.4 Method Declarations
705 * @jls 8.4.1 Formal Parameters
706 * @jls 8.8 Constructor Declarations
707 */
708 public AnnotatedType getAnnotatedReceiverType() {
709 if (Modifier.isStatic(this.getModifiers()))
710 return null;
711 return TypeAnnotationParser.buildAnnotatedType(getTypeAnnotationBytes0(),
712 SharedSecrets.getJavaLangAccess().
713 getConstantPool(getDeclaringClass()),
714 this,
715 getDeclaringClass(),
716 parameterize(getDeclaringClass()),
717 TypeAnnotation.TypeAnnotationTarget.METHOD_RECEIVER);
718 }
719
720 Type parameterize(Class<?> c) {
721 Class<?> ownerClass = c.getDeclaringClass();
722 TypeVariable<?>[] typeVars = c.getTypeParameters();
723
724 // base case, static nested classes, according to JLS 8.1.3, has no
725 // enclosing instance, therefore its owner is not generified.
726 if (ownerClass == null || Modifier.isStatic(c.getModifiers())) {
727 if (typeVars.length == 0)
728 return c;
729 else
730 return ParameterizedTypeImpl.make(c, typeVars, null);
731 }
732
733 // Resolve owner
734 Type ownerType = parameterize(ownerClass);
735 if (ownerType instanceof Class<?> && typeVars.length == 0) // We have yet to encounter type parameters
736 return c;
737 else
738 return ParameterizedTypeImpl.make(c, typeVars, ownerType);
739 }
740
741 /**
742 * Returns an array of {@code AnnotatedType} objects that represent the use
743 * of types to specify formal parameter types of the method/constructor
744 * represented by this Executable. The order of the objects in the array
745 * corresponds to the order of the formal parameter types in the
746 * declaration of the method/constructor.
747 *
748 * Returns an array of length 0 if the method/constructor declares no
749 * parameters.
750 * Note that the constructors of some inner classes
751 * may have an implicitly declared parameter in addition to
752 * explicitly declared ones.
753 *
754 * @return an array of objects representing the types of the
755 * formal parameters of the method or constructor represented by this
756 * {@code Executable}
757 */
758 public AnnotatedType[] getAnnotatedParameterTypes() {
759 return TypeAnnotationParser.buildAnnotatedTypes(getTypeAnnotationBytes0(),
760 SharedSecrets.getJavaLangAccess().
761 getConstantPool(getDeclaringClass()),
762 this,
763 getDeclaringClass(),
764 getAllGenericParameterTypes(),
765 TypeAnnotation.TypeAnnotationTarget.METHOD_FORMAL_PARAMETER);
766 }
767
768 /**
769 * Returns an array of {@code AnnotatedType} objects that represent the use
770 * of types to specify the declared exceptions of the method/constructor
771 * represented by this Executable. The order of the objects in the array
772 * corresponds to the order of the exception types in the declaration of
773 * the method/constructor.
774 *
775 * Returns an array of length 0 if the method/constructor declares no
776 * exceptions.
777 *
778 * @return an array of objects representing the declared
779 * exceptions of the method or constructor represented by this {@code
780 * Executable}
781 */
782 public AnnotatedType[] getAnnotatedExceptionTypes() {
783 return TypeAnnotationParser.buildAnnotatedTypes(getTypeAnnotationBytes0(),
784 SharedSecrets.getJavaLangAccess().
785 getConstantPool(getDeclaringClass()),
786 this,
787 getDeclaringClass(),
788 getGenericExceptionTypes(),
789 TypeAnnotation.TypeAnnotationTarget.THROWS);
790 }
791 }