1 /*
2 * Copyright (c) 1994, 2018, 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;
27
28 import java.lang.annotation.Annotation;
29 import java.lang.module.ModuleReader;
30 import java.lang.ref.SoftReference;
31 import java.io.IOException;
32 import java.io.InputStream;
33 import java.io.ObjectStreamField;
34 import java.lang.reflect.AnnotatedElement;
35 import java.lang.reflect.AnnotatedType;
36 import java.lang.reflect.Array;
37 import java.lang.reflect.Constructor;
38 import java.lang.reflect.Executable;
39 import java.lang.reflect.Field;
40 import java.lang.reflect.GenericArrayType;
41 import java.lang.reflect.GenericDeclaration;
42 import java.lang.reflect.InvocationTargetException;
43 import java.lang.reflect.Member;
44 import java.lang.reflect.Method;
45 import java.lang.reflect.Modifier;
46 import java.lang.reflect.Proxy;
47 import java.lang.reflect.Type;
48 import java.lang.reflect.TypeVariable;
49 import java.net.URL;
50 import java.security.AccessController;
51 import java.security.PrivilegedAction;
52 import java.util.ArrayList;
53 import java.util.Arrays;
54 import java.util.Collection;
55 import java.util.HashMap;
56 import java.util.LinkedHashMap;
57 import java.util.LinkedHashSet;
58 import java.util.List;
59 import java.util.Map;
60 import java.util.Objects;
61 import java.util.StringJoiner;
62
63 import jdk.internal.HotSpotIntrinsicCandidate;
64 import jdk.internal.loader.BootLoader;
65 import jdk.internal.loader.BuiltinClassLoader;
66 import jdk.internal.misc.Unsafe;
67 import jdk.internal.module.Resources;
68 import jdk.internal.reflect.CallerSensitive;
69 import jdk.internal.reflect.ConstantPool;
70 import jdk.internal.reflect.Reflection;
71 import jdk.internal.reflect.ReflectionFactory;
72 import jdk.internal.vm.annotation.ForceInline;
73 import sun.reflect.generics.factory.CoreReflectionFactory;
74 import sun.reflect.generics.factory.GenericsFactory;
75 import sun.reflect.generics.repository.ClassRepository;
76 import sun.reflect.generics.repository.MethodRepository;
77 import sun.reflect.generics.repository.ConstructorRepository;
78 import sun.reflect.generics.scope.ClassScope;
79 import sun.security.util.SecurityConstants;
80 import sun.reflect.annotation.*;
81 import sun.reflect.misc.ReflectUtil;
82
83 /**
84 * Instances of the class {@code Class} represent classes and interfaces
85 * in a running Java application. An enum type is a kind of class and an
86 * annotation type is a kind of interface. Every array also
87 * belongs to a class that is reflected as a {@code Class} object
88 * that is shared by all arrays with the same element type and number
89 * of dimensions. The primitive Java types ({@code boolean},
90 * {@code byte}, {@code char}, {@code short},
91 * {@code int}, {@code long}, {@code float}, and
92 * {@code double}), and the keyword {@code void} are also
93 * represented as {@code Class} objects.
94 *
95 * <p> {@code Class} has no public constructor. Instead a {@code Class}
96 * object is constructed automatically by the Java Virtual Machine
97 * when a class loader invokes one of the
98 * {@link ClassLoader#defineClass(String,byte[], int,int) defineClass} methods
99 * and passes the bytes of a {@code class} file.
100 *
101 * <p> The methods of class {@code Class} expose many characteristics of a
102 * class or interface. Most characteristics are derived from the {@code class}
103 * file that the class loader passed to the Java Virtual Machine. A few
104 * characteristics are determined by the class loading environment at run time,
105 * such as the module returned by {@link #getModule() getModule()}.
106 *
107 * <p> Some methods of class {@code Class} expose whether the declaration of
108 * a class or interface in Java source code was <em>enclosed</em> within
109 * another declaration. Other methods describe how a class or interface
110 * is situated in a <em>nest</em>. A <a id="nest">nest</a> is a set of
111 * classes and interfaces, in the same run-time package, that
112 * allow mutual access to their {@code private} members.
113 * The classes and interfaces are known as <em>nestmates</em>.
114 * One nestmate acts as the
115 * <em>nest host</em>, and enumerates the other nestmates which
116 * belong to the nest; each of them in turn records it as the nest host.
117 * The classes and interfaces which belong to a nest, including its host, are
118 * determined when
119 * {@code class} files are generated, for example, a Java compiler
120 * will typically record a top-level class as the host of a nest where the
121 * other members are the classes and interfaces whose declarations are
122 * enclosed within the top-level class declaration.
123 *
124 * <p> The following example uses a {@code Class} object to print the
125 * class name of an object:
126 *
127 * <blockquote><pre>
128 * void printClassName(Object obj) {
129 * System.out.println("The class of " + obj +
130 * " is " + obj.getClass().getName());
131 * }
132 * </pre></blockquote>
133 *
134 * <p> It is also possible to get the {@code Class} object for a named
135 * type (or for void) using a class literal. See Section 15.8.2 of
136 * <cite>The Java™ Language Specification</cite>.
137 * For example:
138 *
139 * <blockquote>
140 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
141 * </blockquote>
142 *
143 * @param <T> the type of the class modeled by this {@code Class}
144 * object. For example, the type of {@code String.class} is {@code
145 * Class<String>}. Use {@code Class<?>} if the class being modeled is
146 * unknown.
147 *
148 * @author unascribed
149 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
150 * @since 1.0
151 */
152 public final class Class<T> implements java.io.Serializable,
153 GenericDeclaration,
154 Type,
155 AnnotatedElement {
156 private static final int ANNOTATION= 0x00002000;
157 private static final int ENUM = 0x00004000;
158 private static final int SYNTHETIC = 0x00001000;
159
160 private static native void registerNatives();
161 static {
162 registerNatives();
163 }
164
165 /*
166 * Private constructor. Only the Java Virtual Machine creates Class objects.
167 * This constructor is not used and prevents the default constructor being
168 * generated.
169 */
170 private Class(ClassLoader loader, Class<?> arrayComponentType) {
171 // Initialize final field for classLoader. The initialization value of non-null
172 // prevents future JIT optimizations from assuming this final field is null.
173 classLoader = loader;
174 componentType = arrayComponentType;
175 }
176
177 /**
178 * Converts the object to a string. The string representation is the
179 * string "class" or "interface", followed by a space, and then by the
180 * fully qualified name of the class in the format returned by
181 * {@code getName}. If this {@code Class} object represents a
182 * primitive type, this method returns the name of the primitive type. If
183 * this {@code Class} object represents void this method returns
184 * "void". If this {@code Class} object represents an array type,
185 * this method returns "class " followed by {@code getName}.
186 *
187 * @return a string representation of this class object.
188 */
189 public String toString() {
190 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
191 + getName();
192 }
193
194 /**
195 * Returns a string describing this {@code Class}, including
196 * information about modifiers and type parameters.
197 *
198 * The string is formatted as a list of type modifiers, if any,
199 * followed by the kind of type (empty string for primitive types
200 * and {@code class}, {@code enum}, {@code interface}, or
201 * <code>@</code>{@code interface}, as appropriate), followed
202 * by the type's name, followed by an angle-bracketed
203 * comma-separated list of the type's type parameters, if any,
204 * including informative bounds on the type parameters, if any.
205 *
206 * A space is used to separate modifiers from one another and to
207 * separate any modifiers from the kind of type. The modifiers
208 * occur in canonical order. If there are no type parameters, the
209 * type parameter list is elided.
210 *
211 * For an array type, the string starts with the type name,
212 * followed by an angle-bracketed comma-separated list of the
213 * type's type parameters, if any, followed by a sequence of
214 * {@code []} characters, one set of brackets per dimension of
215 * the array.
216 *
217 * <p>Note that since information about the runtime representation
218 * of a type is being generated, modifiers not present on the
219 * originating source code or illegal on the originating source
220 * code may be present.
221 *
222 * @return a string describing this {@code Class}, including
223 * information about modifiers and type parameters
224 *
225 * @since 1.8
226 */
227 public String toGenericString() {
228 if (isPrimitive()) {
229 return toString();
230 } else {
231 StringBuilder sb = new StringBuilder();
232 Class<?> component = this;
233 int arrayDepth = 0;
234
235 if (isArray()) {
236 do {
237 arrayDepth++;
238 component = component.getComponentType();
239 } while (component.isArray());
240 sb.append(component.getName());
241 } else {
242 // Class modifiers are a superset of interface modifiers
243 int modifiers = getModifiers() & Modifier.classModifiers();
244 if (modifiers != 0) {
245 sb.append(Modifier.toString(modifiers));
246 sb.append(' ');
247 }
248
249 if (isAnnotation()) {
250 sb.append('@');
251 }
252 if (isInterface()) { // Note: all annotation types are interfaces
253 sb.append("interface");
254 } else {
255 if (isEnum())
256 sb.append("enum");
257 else
258 sb.append("class");
259 }
260 sb.append(' ');
261 sb.append(getName());
262 }
263
264 TypeVariable<?>[] typeparms = component.getTypeParameters();
265 if (typeparms.length > 0) {
266 StringJoiner sj = new StringJoiner(",", "<", ">");
267 for(TypeVariable<?> typeparm: typeparms) {
268 sj.add(typeVarBounds(typeparm));
269 }
270 sb.append(sj.toString());
271 }
272
273 for (int i = 0; i < arrayDepth; i++)
274 sb.append("[]");
275
276 return sb.toString();
277 }
278 }
279
280 String typeVarBounds(TypeVariable<?> typeVar) {
281 Type[] bounds = typeVar.getBounds();
282 if (bounds.length == 1 && bounds[0].equals(Object.class)) {
283 return typeVar.getName();
284 } else {
285 StringJoiner sj = new StringJoiner(" & ");
286 for (Type bound : bounds) {
287 sj.add(bound.getTypeName());
288 }
289 return typeVar.getName() + " extends " + sj.toString();
290 }
291 }
292
293 /**
294 * Returns the {@code Class} object associated with the class or
295 * interface with the given string name. Invoking this method is
296 * equivalent to:
297 *
298 * <blockquote>
299 * {@code Class.forName(className, true, currentLoader)}
300 * </blockquote>
301 *
302 * where {@code currentLoader} denotes the defining class loader of
303 * the current class.
304 *
305 * <p> For example, the following code fragment returns the
306 * runtime {@code Class} descriptor for the class named
307 * {@code java.lang.Thread}:
308 *
309 * <blockquote>
310 * {@code Class t = Class.forName("java.lang.Thread")}
311 * </blockquote>
312 * <p>
313 * A call to {@code forName("X")} causes the class named
314 * {@code X} to be initialized.
315 *
316 * @param className the fully qualified name of the desired class.
317 * @return the {@code Class} object for the class with the
318 * specified name.
319 * @exception LinkageError if the linkage fails
320 * @exception ExceptionInInitializerError if the initialization provoked
321 * by this method fails
322 * @exception ClassNotFoundException if the class cannot be located
323 */
324 @CallerSensitive
325 public static Class<?> forName(String className)
326 throws ClassNotFoundException {
327 Class<?> caller = Reflection.getCallerClass();
328 return forName0(className, true, ClassLoader.getClassLoader(caller), caller);
329 }
330
331
332 /**
333 * Returns the {@code Class} object associated with the class or
334 * interface with the given string name, using the given class loader.
335 * Given the fully qualified name for a class or interface (in the same
336 * format returned by {@code getName}) this method attempts to
337 * locate, load, and link the class or interface. The specified class
338 * loader is used to load the class or interface. If the parameter
339 * {@code loader} is null, the class is loaded through the bootstrap
340 * class loader. The class is initialized only if the
341 * {@code initialize} parameter is {@code true} and if it has
342 * not been initialized earlier.
343 *
344 * <p> If {@code name} denotes a primitive type or void, an attempt
345 * will be made to locate a user-defined class in the unnamed package whose
346 * name is {@code name}. Therefore, this method cannot be used to
347 * obtain any of the {@code Class} objects representing primitive
348 * types or void.
349 *
350 * <p> If {@code name} denotes an array class, the component type of
351 * the array class is loaded but not initialized.
352 *
353 * <p> For example, in an instance method the expression:
354 *
355 * <blockquote>
356 * {@code Class.forName("Foo")}
357 * </blockquote>
358 *
359 * is equivalent to:
360 *
361 * <blockquote>
362 * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
363 * </blockquote>
364 *
365 * Note that this method throws errors related to loading, linking or
366 * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
367 * Java Language Specification</em>.
368 * Note that this method does not check whether the requested class
369 * is accessible to its caller.
370 *
371 * @param name fully qualified name of the desired class
372 * @param initialize if {@code true} the class will be initialized.
373 * See Section 12.4 of <em>The Java Language Specification</em>.
374 * @param loader class loader from which the class must be loaded
375 * @return class object representing the desired class
376 *
377 * @exception LinkageError if the linkage fails
378 * @exception ExceptionInInitializerError if the initialization provoked
379 * by this method fails
380 * @exception ClassNotFoundException if the class cannot be located by
381 * the specified class loader
382 * @exception SecurityException
383 * if a security manager is present, and the {@code loader} is
384 * {@code null}, and the caller's class loader is not
385 * {@code null}, and the caller does not have the
386 * {@link RuntimePermission}{@code ("getClassLoader")}
387 *
388 * @see java.lang.Class#forName(String)
389 * @see java.lang.ClassLoader
390 * @since 1.2
391 */
392 @CallerSensitive
393 public static Class<?> forName(String name, boolean initialize,
394 ClassLoader loader)
395 throws ClassNotFoundException
396 {
397 Class<?> caller = null;
398 SecurityManager sm = System.getSecurityManager();
399 if (sm != null) {
400 // Reflective call to get caller class is only needed if a security manager
401 // is present. Avoid the overhead of making this call otherwise.
402 caller = Reflection.getCallerClass();
403 if (loader == null) {
404 ClassLoader ccl = ClassLoader.getClassLoader(caller);
405 if (ccl != null) {
406 sm.checkPermission(
407 SecurityConstants.GET_CLASSLOADER_PERMISSION);
408 }
409 }
410 }
411 return forName0(name, initialize, loader, caller);
412 }
413
414 /** Called after security check for system loader access checks have been made. */
415 private static native Class<?> forName0(String name, boolean initialize,
416 ClassLoader loader,
417 Class<?> caller)
418 throws ClassNotFoundException;
419
420
421 /**
422 * Returns the {@code Class} with the given <a href="ClassLoader.html#name">
423 * binary name</a> in the given module.
424 *
425 * <p> This method attempts to locate, load, and link the class or interface.
426 * It does not run the class initializer. If the class is not found, this
427 * method returns {@code null}. </p>
428 *
429 * <p> If the class loader of the given module defines other modules and
430 * the given name is a class defined in a different module, this method
431 * returns {@code null} after the class is loaded. </p>
432 *
433 * <p> This method does not check whether the requested class is
434 * accessible to its caller. </p>
435 *
436 * @apiNote
437 * This method returns {@code null} on failure rather than
438 * throwing a {@link ClassNotFoundException}, as is done by
439 * the {@link #forName(String, boolean, ClassLoader)} method.
440 * The security check is a stack-based permission check if the caller
441 * loads a class in another module.
442 *
443 * @param module A module
444 * @param name The <a href="ClassLoader.html#name">binary name</a>
445 * of the class
446 * @return {@code Class} object of the given name defined in the given module;
447 * {@code null} if not found.
448 *
449 * @throws NullPointerException if the given module or name is {@code null}
450 *
451 * @throws LinkageError if the linkage fails
452 *
453 * @throws SecurityException
454 * <ul>
455 * <li> if the caller is not the specified module and
456 * {@code RuntimePermission("getClassLoader")} permission is denied; or</li>
457 * <li> access to the module content is denied. For example,
458 * permission check will be performed when a class loader calls
459 * {@link ModuleReader#open(String)} to read the bytes of a class file
460 * in a module.</li>
461 * </ul>
462 *
463 * @since 9
464 * @spec JPMS
465 */
466 @CallerSensitive
467 public static Class<?> forName(Module module, String name) {
468 Objects.requireNonNull(module);
469 Objects.requireNonNull(name);
470
471 ClassLoader cl;
472 SecurityManager sm = System.getSecurityManager();
473 if (sm != null) {
474 Class<?> caller = Reflection.getCallerClass();
475 if (caller != null && caller.getModule() != module) {
476 // if caller is null, Class.forName is the last java frame on the stack.
477 // java.base has all permissions
478 sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
479 }
480 PrivilegedAction<ClassLoader> pa = module::getClassLoader;
481 cl = AccessController.doPrivileged(pa);
482 } else {
483 cl = module.getClassLoader();
484 }
485
486 if (cl != null) {
487 return cl.loadClass(module, name);
488 } else {
489 return BootLoader.loadClass(module, name);
490 }
491 }
492
493 /**
494 * Creates a new instance of the class represented by this {@code Class}
495 * object. The class is instantiated as if by a {@code new}
496 * expression with an empty argument list. The class is initialized if it
497 * has not already been initialized.
498 *
499 * @deprecated This method propagates any exception thrown by the
500 * nullary constructor, including a checked exception. Use of
501 * this method effectively bypasses the compile-time exception
502 * checking that would otherwise be performed by the compiler.
503 * The {@link
504 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
505 * Constructor.newInstance} method avoids this problem by wrapping
506 * any exception thrown by the constructor in a (checked) {@link
507 * java.lang.reflect.InvocationTargetException}.
508 *
509 * <p>The call
510 *
511 * <pre>{@code
512 * clazz.newInstance()
513 * }</pre>
514 *
515 * can be replaced by
516 *
517 * <pre>{@code
518 * clazz.getDeclaredConstructor().newInstance()
519 * }</pre>
520 *
521 * The latter sequence of calls is inferred to be able to throw
522 * the additional exception types {@link
523 * InvocationTargetException} and {@link
524 * NoSuchMethodException}. Both of these exception types are
525 * subclasses of {@link ReflectiveOperationException}.
526 *
527 * @return a newly allocated instance of the class represented by this
528 * object.
529 * @throws IllegalAccessException if the class or its nullary
530 * constructor is not accessible.
531 * @throws InstantiationException
532 * if this {@code Class} represents an abstract class,
533 * an interface, an array class, a primitive type, or void;
534 * or if the class has no nullary constructor;
535 * or if the instantiation fails for some other reason.
536 * @throws ExceptionInInitializerError if the initialization
537 * provoked by this method fails.
538 * @throws SecurityException
539 * If a security manager, <i>s</i>, is present and
540 * the caller's class loader is not the same as or an
541 * ancestor of the class loader for the current class and
542 * invocation of {@link SecurityManager#checkPackageAccess
543 * s.checkPackageAccess()} denies access to the package
544 * of this class.
545 */
546 @CallerSensitive
547 @Deprecated(since="9")
548 public T newInstance()
549 throws InstantiationException, IllegalAccessException
550 {
551 SecurityManager sm = System.getSecurityManager();
552 if (sm != null) {
553 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
554 }
555
556 // Constructor lookup
557 Constructor<T> tmpConstructor = cachedConstructor;
558 if (tmpConstructor == null) {
559 if (this == Class.class) {
560 throw new IllegalAccessException(
561 "Can not call newInstance() on the Class for java.lang.Class"
562 );
563 }
564 try {
565 Class<?>[] empty = {};
566 final Constructor<T> c = getReflectionFactory().copyConstructor(
567 getConstructor0(empty, Member.DECLARED));
568 // Disable accessibility checks on the constructor
569 // access check is done with the true caller
570 java.security.AccessController.doPrivileged(
571 new java.security.PrivilegedAction<>() {
572 public Void run() {
573 c.setAccessible(true);
574 return null;
575 }
576 });
577 cachedConstructor = tmpConstructor = c;
578 } catch (NoSuchMethodException e) {
579 throw (InstantiationException)
580 new InstantiationException(getName()).initCause(e);
581 }
582 }
583
584 try {
585 Class<?> caller = Reflection.getCallerClass();
586 return getReflectionFactory().newInstance(tmpConstructor, null, caller);
587 } catch (InvocationTargetException e) {
588 Unsafe.getUnsafe().throwException(e.getTargetException());
589 // Not reached
590 return null;
591 }
592 }
593
594 private transient volatile Constructor<T> cachedConstructor;
595
596 /**
597 * Determines if the specified {@code Object} is assignment-compatible
598 * with the object represented by this {@code Class}. This method is
599 * the dynamic equivalent of the Java language {@code instanceof}
600 * operator. The method returns {@code true} if the specified
601 * {@code Object} argument is non-null and can be cast to the
602 * reference type represented by this {@code Class} object without
603 * raising a {@code ClassCastException.} It returns {@code false}
604 * otherwise.
605 *
606 * <p> Specifically, if this {@code Class} object represents a
607 * declared class, this method returns {@code true} if the specified
608 * {@code Object} argument is an instance of the represented class (or
609 * of any of its subclasses); it returns {@code false} otherwise. If
610 * this {@code Class} object represents an array class, this method
611 * returns {@code true} if the specified {@code Object} argument
612 * can be converted to an object of the array class by an identity
613 * conversion or by a widening reference conversion; it returns
614 * {@code false} otherwise. If this {@code Class} object
615 * represents an interface, this method returns {@code true} if the
616 * class or any superclass of the specified {@code Object} argument
617 * implements this interface; it returns {@code false} otherwise. If
618 * this {@code Class} object represents a primitive type, this method
619 * returns {@code false}.
620 *
621 * @param obj the object to check
622 * @return true if {@code obj} is an instance of this class
623 *
624 * @since 1.1
625 */
626 @HotSpotIntrinsicCandidate
627 public native boolean isInstance(Object obj);
628
629
630 /**
631 * Determines if the class or interface represented by this
632 * {@code Class} object is either the same as, or is a superclass or
633 * superinterface of, the class or interface represented by the specified
634 * {@code Class} parameter. It returns {@code true} if so;
635 * otherwise it returns {@code false}. If this {@code Class}
636 * object represents a primitive type, this method returns
637 * {@code true} if the specified {@code Class} parameter is
638 * exactly this {@code Class} object; otherwise it returns
639 * {@code false}.
640 *
641 * <p> Specifically, this method tests whether the type represented by the
642 * specified {@code Class} parameter can be converted to the type
643 * represented by this {@code Class} object via an identity conversion
644 * or via a widening reference conversion. See <em>The Java Language
645 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
646 *
647 * @param cls the {@code Class} object to be checked
648 * @return the {@code boolean} value indicating whether objects of the
649 * type {@code cls} can be assigned to objects of this class
650 * @exception NullPointerException if the specified Class parameter is
651 * null.
652 * @since 1.1
653 */
654 @HotSpotIntrinsicCandidate
655 public native boolean isAssignableFrom(Class<?> cls);
656
657
658 /**
659 * Determines if the specified {@code Class} object represents an
660 * interface type.
661 *
662 * @return {@code true} if this object represents an interface;
663 * {@code false} otherwise.
664 */
665 @HotSpotIntrinsicCandidate
666 public native boolean isInterface();
667
668
669 /**
670 * Determines if this {@code Class} object represents an array class.
671 *
672 * @return {@code true} if this object represents an array class;
673 * {@code false} otherwise.
674 * @since 1.1
675 */
676 @HotSpotIntrinsicCandidate
677 public native boolean isArray();
678
679
680 /**
681 * Determines if the specified {@code Class} object represents a
682 * primitive type.
683 *
684 * <p> There are nine predefined {@code Class} objects to represent
685 * the eight primitive types and void. These are created by the Java
686 * Virtual Machine, and have the same names as the primitive types that
687 * they represent, namely {@code boolean}, {@code byte},
688 * {@code char}, {@code short}, {@code int},
689 * {@code long}, {@code float}, and {@code double}.
690 *
691 * <p> These objects may only be accessed via the following public static
692 * final variables, and are the only {@code Class} objects for which
693 * this method returns {@code true}.
694 *
695 * @return true if and only if this class represents a primitive type
696 *
697 * @see java.lang.Boolean#TYPE
698 * @see java.lang.Character#TYPE
699 * @see java.lang.Byte#TYPE
700 * @see java.lang.Short#TYPE
701 * @see java.lang.Integer#TYPE
702 * @see java.lang.Long#TYPE
703 * @see java.lang.Float#TYPE
704 * @see java.lang.Double#TYPE
705 * @see java.lang.Void#TYPE
706 * @since 1.1
707 */
708 @HotSpotIntrinsicCandidate
709 public native boolean isPrimitive();
710
711 /**
712 * Returns true if this {@code Class} object represents an annotation
713 * type. Note that if this method returns true, {@link #isInterface()}
714 * would also return true, as all annotation types are also interfaces.
715 *
716 * @return {@code true} if this class object represents an annotation
717 * type; {@code false} otherwise
718 * @since 1.5
719 */
720 public boolean isAnnotation() {
721 return (getModifiers() & ANNOTATION) != 0;
722 }
723
724 /**
725 * Returns {@code true} if this class is a synthetic class;
726 * returns {@code false} otherwise.
727 * @return {@code true} if and only if this class is a synthetic class as
728 * defined by the Java Language Specification.
729 * @jls 13.1 The Form of a Binary
730 * @since 1.5
731 */
732 public boolean isSynthetic() {
733 return (getModifiers() & SYNTHETIC) != 0;
734 }
735
736 /**
737 * Returns the name of the entity (class, interface, array class,
738 * primitive type, or void) represented by this {@code Class} object,
739 * as a {@code String}.
740 *
741 * <p> If this class object represents a reference type that is not an
742 * array type then the binary name of the class is returned, as specified
743 * by
744 * <cite>The Java™ Language Specification</cite>.
745 *
746 * <p> If this class object represents a primitive type or void, then the
747 * name returned is a {@code String} equal to the Java language
748 * keyword corresponding to the primitive type or void.
749 *
750 * <p> If this class object represents a class of arrays, then the internal
751 * form of the name consists of the name of the element type preceded by
752 * one or more '{@code [}' characters representing the depth of the array
753 * nesting. The encoding of element type names is as follows:
754 *
755 * <blockquote><table class="striped">
756 * <caption style="display:none">Element types and encodings</caption>
757 * <thead>
758 * <tr><th scope="col"> Element Type <th scope="col"> Encoding
759 * </thead>
760 * <tbody style="text-align:left">
761 * <tr><th scope="row"> boolean <td style="text-align:center"> Z
762 * <tr><th scope="row"> byte <td style="text-align:center"> B
763 * <tr><th scope="row"> char <td style="text-align:center"> C
764 * <tr><th scope="row"> class or interface
765 * <td style="text-align:center"> L<i>classname</i>;
766 * <tr><th scope="row"> double <td style="text-align:center"> D
767 * <tr><th scope="row"> float <td style="text-align:center"> F
768 * <tr><th scope="row"> int <td style="text-align:center"> I
769 * <tr><th scope="row"> long <td style="text-align:center"> J
770 * <tr><th scope="row"> short <td style="text-align:center"> S
771 * </tbody>
772 * </table></blockquote>
773 *
774 * <p> The class or interface name <i>classname</i> is the binary name of
775 * the class specified above.
776 *
777 * <p> Examples:
778 * <blockquote><pre>
779 * String.class.getName()
780 * returns "java.lang.String"
781 * byte.class.getName()
782 * returns "byte"
783 * (new Object[3]).getClass().getName()
784 * returns "[Ljava.lang.Object;"
785 * (new int[3][4][5][6][7][8][9]).getClass().getName()
786 * returns "[[[[[[[I"
787 * </pre></blockquote>
788 *
789 * @return the name of the class or interface
790 * represented by this object.
791 */
792 public String getName() {
793 String name = this.name;
794 if (name == null)
795 this.name = name = getName0();
796 return name;
797 }
798
799 // cache the name to reduce the number of calls into the VM
800 private transient String name;
801 private native String getName0();
802
803 /**
804 * Returns the class loader for the class. Some implementations may use
805 * null to represent the bootstrap class loader. This method will return
806 * null in such implementations if this class was loaded by the bootstrap
807 * class loader.
808 *
809 * <p>If this object
810 * represents a primitive type or void, null is returned.
811 *
812 * @return the class loader that loaded the class or interface
813 * represented by this object.
814 * @throws SecurityException
815 * if a security manager is present, and the caller's class loader
816 * is not {@code null} and is not the same as or an ancestor of the
817 * class loader for the class whose class loader is requested,
818 * and the caller does not have the
819 * {@link RuntimePermission}{@code ("getClassLoader")}
820 * @see java.lang.ClassLoader
821 * @see SecurityManager#checkPermission
822 * @see java.lang.RuntimePermission
823 */
824 @CallerSensitive
825 @ForceInline // to ensure Reflection.getCallerClass optimization
826 public ClassLoader getClassLoader() {
827 ClassLoader cl = getClassLoader0();
828 if (cl == null)
829 return null;
830 SecurityManager sm = System.getSecurityManager();
831 if (sm != null) {
832 ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());
833 }
834 return cl;
835 }
836
837 // Package-private to allow ClassLoader access
838 ClassLoader getClassLoader0() { return classLoader; }
839
840 /**
841 * Returns the module that this class or interface is a member of.
842 *
843 * If this class represents an array type then this method returns the
844 * {@code Module} for the element type. If this class represents a
845 * primitive type or void, then the {@code Module} object for the
846 * {@code java.base} module is returned.
847 *
848 * If this class is in an unnamed module then the {@linkplain
849 * ClassLoader#getUnnamedModule() unnamed} {@code Module} of the class
850 * loader for this class is returned.
851 *
852 * @return the module that this class or interface is a member of
853 *
854 * @since 9
855 * @spec JPMS
856 */
857 public Module getModule() {
858 return module;
859 }
860
861 // set by VM
862 private transient Module module;
863
864 // Initialized in JVM not by private constructor
865 // This field is filtered from reflection access, i.e. getDeclaredField
866 // will throw NoSuchFieldException
867 private final ClassLoader classLoader;
868
869 /**
870 * Returns an array of {@code TypeVariable} objects that represent the
871 * type variables declared by the generic declaration represented by this
872 * {@code GenericDeclaration} object, in declaration order. Returns an
873 * array of length 0 if the underlying generic declaration declares no type
874 * variables.
875 *
876 * @return an array of {@code TypeVariable} objects that represent
877 * the type variables declared by this generic declaration
878 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
879 * signature of this generic declaration does not conform to
880 * the format specified in
881 * <cite>The Java™ Virtual Machine Specification</cite>
882 * @since 1.5
883 */
884 @SuppressWarnings("unchecked")
885 public TypeVariable<Class<T>>[] getTypeParameters() {
886 ClassRepository info = getGenericInfo();
887 if (info != null)
888 return (TypeVariable<Class<T>>[])info.getTypeParameters();
889 else
890 return (TypeVariable<Class<T>>[])new TypeVariable<?>[0];
891 }
892
893
894 /**
895 * Returns the {@code Class} representing the direct superclass of the
896 * entity (class, interface, primitive type or void) represented by
897 * this {@code Class}. If this {@code Class} represents either the
898 * {@code Object} class, an interface, a primitive type, or void, then
899 * null is returned. If this object represents an array class then the
900 * {@code Class} object representing the {@code Object} class is
901 * returned.
902 *
903 * @return the direct superclass of the class represented by this object
904 */
905 @HotSpotIntrinsicCandidate
906 public native Class<? super T> getSuperclass();
907
908
909 /**
910 * Returns the {@code Type} representing the direct superclass of
911 * the entity (class, interface, primitive type or void) represented by
912 * this {@code Class}.
913 *
914 * <p>If the superclass is a parameterized type, the {@code Type}
915 * object returned must accurately reflect the actual type
916 * parameters used in the source code. The parameterized type
917 * representing the superclass is created if it had not been
918 * created before. See the declaration of {@link
919 * java.lang.reflect.ParameterizedType ParameterizedType} for the
920 * semantics of the creation process for parameterized types. If
921 * this {@code Class} represents either the {@code Object}
922 * class, an interface, a primitive type, or void, then null is
923 * returned. If this object represents an array class then the
924 * {@code Class} object representing the {@code Object} class is
925 * returned.
926 *
927 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
928 * class signature does not conform to the format specified in
929 * <cite>The Java™ Virtual Machine Specification</cite>
930 * @throws TypeNotPresentException if the generic superclass
931 * refers to a non-existent type declaration
932 * @throws java.lang.reflect.MalformedParameterizedTypeException if the
933 * generic superclass refers to a parameterized type that cannot be
934 * instantiated for any reason
935 * @return the direct superclass of the class represented by this object
936 * @since 1.5
937 */
938 public Type getGenericSuperclass() {
939 ClassRepository info = getGenericInfo();
940 if (info == null) {
941 return getSuperclass();
942 }
943
944 // Historical irregularity:
945 // Generic signature marks interfaces with superclass = Object
946 // but this API returns null for interfaces
947 if (isInterface()) {
948 return null;
949 }
950
951 return info.getSuperclass();
952 }
953
954 /**
955 * Gets the package of this class.
956 *
957 * <p>If this class represents an array type, a primitive type or void,
958 * this method returns {@code null}.
959 *
960 * @return the package of this class.
961 * @revised 9
962 * @spec JPMS
963 */
964 public Package getPackage() {
965 if (isPrimitive() || isArray()) {
966 return null;
967 }
968 ClassLoader cl = getClassLoader0();
969 return cl != null ? cl.definePackage(this)
970 : BootLoader.definePackage(this);
971 }
972
973 /**
974 * Returns the fully qualified package name.
975 *
976 * <p> If this class is a top level class, then this method returns the fully
977 * qualified name of the package that the class is a member of, or the
978 * empty string if the class is in an unnamed package.
979 *
980 * <p> If this class is a member class, then this method is equivalent to
981 * invoking {@code getPackageName()} on the {@linkplain #getEnclosingClass
982 * enclosing class}.
983 *
984 * <p> If this class is a {@linkplain #isLocalClass local class} or an {@linkplain
985 * #isAnonymousClass() anonymous class}, then this method is equivalent to
986 * invoking {@code getPackageName()} on the {@linkplain #getDeclaringClass
987 * declaring class} of the {@linkplain #getEnclosingMethod enclosing method} or
988 * {@linkplain #getEnclosingConstructor enclosing constructor}.
989 *
990 * <p> If this class represents an array type then this method returns the
991 * package name of the element type. If this class represents a primitive
992 * type or void then the package name "{@code java.lang}" is returned.
993 *
994 * @return the fully qualified package name
995 *
996 * @since 9
997 * @spec JPMS
998 * @jls 6.7 Fully Qualified Names
999 */
1000 public String getPackageName() {
1001 String pn = this.packageName;
1002 if (pn == null) {
1003 Class<?> c = this;
1004 while (c.isArray()) {
1005 c = c.getComponentType();
1006 }
1007 if (c.isPrimitive()) {
1008 pn = "java.lang";
1009 } else {
1010 String cn = c.getName();
1011 int dot = cn.lastIndexOf('.');
1012 pn = (dot != -1) ? cn.substring(0, dot).intern() : "";
1013 }
1014 this.packageName = pn;
1015 }
1016 return pn;
1017 }
1018
1019 // cached package name
1020 private transient String packageName;
1021
1022 /**
1023 * Returns the interfaces directly implemented by the class or interface
1024 * represented by this object.
1025 *
1026 * <p>If this object represents a class, the return value is an array
1027 * containing objects representing all interfaces directly implemented by
1028 * the class. The order of the interface objects in the array corresponds
1029 * to the order of the interface names in the {@code implements} clause of
1030 * the declaration of the class represented by this object. For example,
1031 * given the declaration:
1032 * <blockquote>
1033 * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
1034 * </blockquote>
1035 * suppose the value of {@code s} is an instance of
1036 * {@code Shimmer}; the value of the expression:
1037 * <blockquote>
1038 * {@code s.getClass().getInterfaces()[0]}
1039 * </blockquote>
1040 * is the {@code Class} object that represents interface
1041 * {@code FloorWax}; and the value of:
1042 * <blockquote>
1043 * {@code s.getClass().getInterfaces()[1]}
1044 * </blockquote>
1045 * is the {@code Class} object that represents interface
1046 * {@code DessertTopping}.
1047 *
1048 * <p>If this object represents an interface, the array contains objects
1049 * representing all interfaces directly extended by the interface. The
1050 * order of the interface objects in the array corresponds to the order of
1051 * the interface names in the {@code extends} clause of the declaration of
1052 * the interface represented by this object.
1053 *
1054 * <p>If this object represents a class or interface that implements no
1055 * interfaces, the method returns an array of length 0.
1056 *
1057 * <p>If this object represents a primitive type or void, the method
1058 * returns an array of length 0.
1059 *
1060 * <p>If this {@code Class} object represents an array type, the
1061 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1062 * returned in that order.
1063 *
1064 * @return an array of interfaces directly implemented by this class
1065 */
1066 public Class<?>[] getInterfaces() {
1067 // defensively copy before handing over to user code
1068 return getInterfaces(true);
1069 }
1070
1071 private Class<?>[] getInterfaces(boolean cloneArray) {
1072 ReflectionData<T> rd = reflectionData();
1073 if (rd == null) {
1074 // no cloning required
1075 return getInterfaces0();
1076 } else {
1077 Class<?>[] interfaces = rd.interfaces;
1078 if (interfaces == null) {
1079 interfaces = getInterfaces0();
1080 rd.interfaces = interfaces;
1081 }
1082 // defensively copy if requested
1083 return cloneArray ? interfaces.clone() : interfaces;
1084 }
1085 }
1086
1087 private native Class<?>[] getInterfaces0();
1088
1089 /**
1090 * Returns the {@code Type}s representing the interfaces
1091 * directly implemented by the class or interface represented by
1092 * this object.
1093 *
1094 * <p>If a superinterface is a parameterized type, the
1095 * {@code Type} object returned for it must accurately reflect
1096 * the actual type parameters used in the source code. The
1097 * parameterized type representing each superinterface is created
1098 * if it had not been created before. See the declaration of
1099 * {@link java.lang.reflect.ParameterizedType ParameterizedType}
1100 * for the semantics of the creation process for parameterized
1101 * types.
1102 *
1103 * <p>If this object represents a class, the return value is an array
1104 * containing objects representing all interfaces directly implemented by
1105 * the class. The order of the interface objects in the array corresponds
1106 * to the order of the interface names in the {@code implements} clause of
1107 * the declaration of the class represented by this object.
1108 *
1109 * <p>If this object represents an interface, the array contains objects
1110 * representing all interfaces directly extended by the interface. The
1111 * order of the interface objects in the array corresponds to the order of
1112 * the interface names in the {@code extends} clause of the declaration of
1113 * the interface represented by this object.
1114 *
1115 * <p>If this object represents a class or interface that implements no
1116 * interfaces, the method returns an array of length 0.
1117 *
1118 * <p>If this object represents a primitive type or void, the method
1119 * returns an array of length 0.
1120 *
1121 * <p>If this {@code Class} object represents an array type, the
1122 * interfaces {@code Cloneable} and {@code java.io.Serializable} are
1123 * returned in that order.
1124 *
1125 * @throws java.lang.reflect.GenericSignatureFormatError
1126 * if the generic class signature does not conform to the format
1127 * specified in
1128 * <cite>The Java™ Virtual Machine Specification</cite>
1129 * @throws TypeNotPresentException if any of the generic
1130 * superinterfaces refers to a non-existent type declaration
1131 * @throws java.lang.reflect.MalformedParameterizedTypeException
1132 * if any of the generic superinterfaces refer to a parameterized
1133 * type that cannot be instantiated for any reason
1134 * @return an array of interfaces directly implemented by this class
1135 * @since 1.5
1136 */
1137 public Type[] getGenericInterfaces() {
1138 ClassRepository info = getGenericInfo();
1139 return (info == null) ? getInterfaces() : info.getSuperInterfaces();
1140 }
1141
1142
1143 /**
1144 * Returns the {@code Class} representing the component type of an
1145 * array. If this class does not represent an array class this method
1146 * returns null.
1147 *
1148 * @return the {@code Class} representing the component type of this
1149 * class if this class is an array
1150 * @see java.lang.reflect.Array
1151 * @since 1.1
1152 */
1153 public Class<?> getComponentType() {
1154 // Only return for array types. Storage may be reused for Class for instance types.
1155 if (isArray()) {
1156 return componentType;
1157 } else {
1158 return null;
1159 }
1160 }
1161
1162 private final Class<?> componentType;
1163
1164
1165 /**
1166 * Returns the Java language modifiers for this class or interface, encoded
1167 * in an integer. The modifiers consist of the Java Virtual Machine's
1168 * constants for {@code public}, {@code protected},
1169 * {@code private}, {@code final}, {@code static},
1170 * {@code abstract} and {@code interface}; they should be decoded
1171 * using the methods of class {@code Modifier}.
1172 *
1173 * <p> If the underlying class is an array class, then its
1174 * {@code public}, {@code private} and {@code protected}
1175 * modifiers are the same as those of its component type. If this
1176 * {@code Class} represents a primitive type or void, its
1177 * {@code public} modifier is always {@code true}, and its
1178 * {@code protected} and {@code private} modifiers are always
1179 * {@code false}. If this object represents an array class, a
1180 * primitive type or void, then its {@code final} modifier is always
1181 * {@code true} and its interface modifier is always
1182 * {@code false}. The values of its other modifiers are not determined
1183 * by this specification.
1184 *
1185 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
1186 * Specification</em>, table 4.1.
1187 *
1188 * @return the {@code int} representing the modifiers for this class
1189 * @see java.lang.reflect.Modifier
1190 * @since 1.1
1191 */
1192 @HotSpotIntrinsicCandidate
1193 public native int getModifiers();
1194
1195
1196 /**
1197 * Gets the signers of this class.
1198 *
1199 * @return the signers of this class, or null if there are no signers. In
1200 * particular, this method returns null if this object represents
1201 * a primitive type or void.
1202 * @since 1.1
1203 */
1204 public native Object[] getSigners();
1205
1206
1207 /**
1208 * Set the signers of this class.
1209 */
1210 native void setSigners(Object[] signers);
1211
1212
1213 /**
1214 * If this {@code Class} object represents a local or anonymous
1215 * class within a method, returns a {@link
1216 * java.lang.reflect.Method Method} object representing the
1217 * immediately enclosing method of the underlying class. Returns
1218 * {@code null} otherwise.
1219 *
1220 * In particular, this method returns {@code null} if the underlying
1221 * class is a local or anonymous class immediately enclosed by a type
1222 * declaration, instance initializer or static initializer.
1223 *
1224 * @return the immediately enclosing method of the underlying class, if
1225 * that class is a local or anonymous class; otherwise {@code null}.
1226 *
1227 * @throws SecurityException
1228 * If a security manager, <i>s</i>, is present and any of the
1229 * following conditions is met:
1230 *
1231 * <ul>
1232 *
1233 * <li> the caller's class loader is not the same as the
1234 * class loader of the enclosing class and invocation of
1235 * {@link SecurityManager#checkPermission
1236 * s.checkPermission} method with
1237 * {@code RuntimePermission("accessDeclaredMembers")}
1238 * denies access to the methods within the enclosing class
1239 *
1240 * <li> the caller's class loader is not the same as or an
1241 * ancestor of the class loader for the enclosing class and
1242 * invocation of {@link SecurityManager#checkPackageAccess
1243 * s.checkPackageAccess()} denies access to the package
1244 * of the enclosing class
1245 *
1246 * </ul>
1247 * @since 1.5
1248 */
1249 @CallerSensitive
1250 public Method getEnclosingMethod() throws SecurityException {
1251 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1252
1253 if (enclosingInfo == null)
1254 return null;
1255 else {
1256 if (!enclosingInfo.isMethod())
1257 return null;
1258
1259 MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
1260 getFactory());
1261 Class<?> returnType = toClass(typeInfo.getReturnType());
1262 Type [] parameterTypes = typeInfo.getParameterTypes();
1263 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1264
1265 // Convert Types to Classes; returned types *should*
1266 // be class objects since the methodDescriptor's used
1267 // don't have generics information
1268 for(int i = 0; i < parameterClasses.length; i++)
1269 parameterClasses[i] = toClass(parameterTypes[i]);
1270
1271 // Perform access check
1272 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1273 SecurityManager sm = System.getSecurityManager();
1274 if (sm != null) {
1275 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
1276 Reflection.getCallerClass(), true);
1277 }
1278 Method[] candidates = enclosingCandidate.privateGetDeclaredMethods(false);
1279
1280 /*
1281 * Loop over all declared methods; match method name,
1282 * number of and type of parameters, *and* return
1283 * type. Matching return type is also necessary
1284 * because of covariant returns, etc.
1285 */
1286 ReflectionFactory fact = getReflectionFactory();
1287 for (Method m : candidates) {
1288 if (m.getName().equals(enclosingInfo.getName()) &&
1289 arrayContentsEq(parameterClasses,
1290 fact.getExecutableSharedParameterTypes(m))) {
1291 // finally, check return type
1292 if (m.getReturnType().equals(returnType)) {
1293 return fact.copyMethod(m);
1294 }
1295 }
1296 }
1297
1298 throw new InternalError("Enclosing method not found");
1299 }
1300 }
1301
1302 private native Object[] getEnclosingMethod0();
1303
1304 private EnclosingMethodInfo getEnclosingMethodInfo() {
1305 Object[] enclosingInfo = getEnclosingMethod0();
1306 if (enclosingInfo == null)
1307 return null;
1308 else {
1309 return new EnclosingMethodInfo(enclosingInfo);
1310 }
1311 }
1312
1313 private static final class EnclosingMethodInfo {
1314 private final Class<?> enclosingClass;
1315 private final String name;
1316 private final String descriptor;
1317
1318 static void validate(Object[] enclosingInfo) {
1319 if (enclosingInfo.length != 3)
1320 throw new InternalError("Malformed enclosing method information");
1321 try {
1322 // The array is expected to have three elements:
1323
1324 // the immediately enclosing class
1325 Class<?> enclosingClass = (Class<?>)enclosingInfo[0];
1326 assert(enclosingClass != null);
1327
1328 // the immediately enclosing method or constructor's
1329 // name (can be null).
1330 String name = (String)enclosingInfo[1];
1331
1332 // the immediately enclosing method or constructor's
1333 // descriptor (null iff name is).
1334 String descriptor = (String)enclosingInfo[2];
1335 assert((name != null && descriptor != null) || name == descriptor);
1336 } catch (ClassCastException cce) {
1337 throw new InternalError("Invalid type in enclosing method information", cce);
1338 }
1339 }
1340
1341 EnclosingMethodInfo(Object[] enclosingInfo) {
1342 validate(enclosingInfo);
1343 this.enclosingClass = (Class<?>)enclosingInfo[0];
1344 this.name = (String)enclosingInfo[1];
1345 this.descriptor = (String)enclosingInfo[2];
1346 }
1347
1348 boolean isPartial() {
1349 return enclosingClass == null || name == null || descriptor == null;
1350 }
1351
1352 boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
1353
1354 boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
1355
1356 Class<?> getEnclosingClass() { return enclosingClass; }
1357
1358 String getName() { return name; }
1359
1360 String getDescriptor() { return descriptor; }
1361
1362 }
1363
1364 private static Class<?> toClass(Type o) {
1365 if (o instanceof GenericArrayType)
1366 return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
1367 0)
1368 .getClass();
1369 return (Class<?>)o;
1370 }
1371
1372 /**
1373 * If this {@code Class} object represents a local or anonymous
1374 * class within a constructor, returns a {@link
1375 * java.lang.reflect.Constructor Constructor} object representing
1376 * the immediately enclosing constructor of the underlying
1377 * class. Returns {@code null} otherwise. In particular, this
1378 * method returns {@code null} if the underlying class is a local
1379 * or anonymous class immediately enclosed by a type declaration,
1380 * instance initializer or static initializer.
1381 *
1382 * @return the immediately enclosing constructor of the underlying class, if
1383 * that class is a local or anonymous class; otherwise {@code null}.
1384 * @throws SecurityException
1385 * If a security manager, <i>s</i>, is present and any of the
1386 * following conditions is met:
1387 *
1388 * <ul>
1389 *
1390 * <li> the caller's class loader is not the same as the
1391 * class loader of the enclosing class and invocation of
1392 * {@link SecurityManager#checkPermission
1393 * s.checkPermission} method with
1394 * {@code RuntimePermission("accessDeclaredMembers")}
1395 * denies access to the constructors within the enclosing class
1396 *
1397 * <li> the caller's class loader is not the same as or an
1398 * ancestor of the class loader for the enclosing class and
1399 * invocation of {@link SecurityManager#checkPackageAccess
1400 * s.checkPackageAccess()} denies access to the package
1401 * of the enclosing class
1402 *
1403 * </ul>
1404 * @since 1.5
1405 */
1406 @CallerSensitive
1407 public Constructor<?> getEnclosingConstructor() throws SecurityException {
1408 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1409
1410 if (enclosingInfo == null)
1411 return null;
1412 else {
1413 if (!enclosingInfo.isConstructor())
1414 return null;
1415
1416 ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
1417 getFactory());
1418 Type [] parameterTypes = typeInfo.getParameterTypes();
1419 Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
1420
1421 // Convert Types to Classes; returned types *should*
1422 // be class objects since the methodDescriptor's used
1423 // don't have generics information
1424 for(int i = 0; i < parameterClasses.length; i++)
1425 parameterClasses[i] = toClass(parameterTypes[i]);
1426
1427 // Perform access check
1428 final Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();
1429 SecurityManager sm = System.getSecurityManager();
1430 if (sm != null) {
1431 enclosingCandidate.checkMemberAccess(sm, Member.DECLARED,
1432 Reflection.getCallerClass(), true);
1433 }
1434
1435 Constructor<?>[] candidates = enclosingCandidate
1436 .privateGetDeclaredConstructors(false);
1437 /*
1438 * Loop over all declared constructors; match number
1439 * of and type of parameters.
1440 */
1441 ReflectionFactory fact = getReflectionFactory();
1442 for (Constructor<?> c : candidates) {
1443 if (arrayContentsEq(parameterClasses,
1444 fact.getExecutableSharedParameterTypes(c))) {
1445 return fact.copyConstructor(c);
1446 }
1447 }
1448
1449 throw new InternalError("Enclosing constructor not found");
1450 }
1451 }
1452
1453
1454 /**
1455 * If the class or interface represented by this {@code Class} object
1456 * is a member of another class, returns the {@code Class} object
1457 * representing the class in which it was declared. This method returns
1458 * null if this class or interface is not a member of any other class. If
1459 * this {@code Class} object represents an array class, a primitive
1460 * type, or void,then this method returns null.
1461 *
1462 * @return the declaring class for this class
1463 * @throws SecurityException
1464 * If a security manager, <i>s</i>, is present and the caller's
1465 * class loader is not the same as or an ancestor of the class
1466 * loader for the declaring class and invocation of {@link
1467 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1468 * denies access to the package of the declaring class
1469 * @since 1.1
1470 */
1471 @CallerSensitive
1472 public Class<?> getDeclaringClass() throws SecurityException {
1473 final Class<?> candidate = getDeclaringClass0();
1474
1475 if (candidate != null) {
1476 SecurityManager sm = System.getSecurityManager();
1477 if (sm != null) {
1478 candidate.checkPackageAccess(sm,
1479 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1480 }
1481 }
1482 return candidate;
1483 }
1484
1485 private native Class<?> getDeclaringClass0();
1486
1487
1488 /**
1489 * Returns the immediately enclosing class of the underlying
1490 * class. If the underlying class is a top level class this
1491 * method returns {@code null}.
1492 * @return the immediately enclosing class of the underlying class
1493 * @exception SecurityException
1494 * If a security manager, <i>s</i>, is present and the caller's
1495 * class loader is not the same as or an ancestor of the class
1496 * loader for the enclosing class and invocation of {@link
1497 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
1498 * denies access to the package of the enclosing class
1499 * @since 1.5
1500 */
1501 @CallerSensitive
1502 public Class<?> getEnclosingClass() throws SecurityException {
1503 // There are five kinds of classes (or interfaces):
1504 // a) Top level classes
1505 // b) Nested classes (static member classes)
1506 // c) Inner classes (non-static member classes)
1507 // d) Local classes (named classes declared within a method)
1508 // e) Anonymous classes
1509
1510
1511 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1512 // attribute if and only if it is a local class or an
1513 // anonymous class.
1514 EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
1515 Class<?> enclosingCandidate;
1516
1517 if (enclosingInfo == null) {
1518 // This is a top level or a nested class or an inner class (a, b, or c)
1519 enclosingCandidate = getDeclaringClass0();
1520 } else {
1521 Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
1522 // This is a local class or an anonymous class (d or e)
1523 if (enclosingClass == this || enclosingClass == null)
1524 throw new InternalError("Malformed enclosing method information");
1525 else
1526 enclosingCandidate = enclosingClass;
1527 }
1528
1529 if (enclosingCandidate != null) {
1530 SecurityManager sm = System.getSecurityManager();
1531 if (sm != null) {
1532 enclosingCandidate.checkPackageAccess(sm,
1533 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
1534 }
1535 }
1536 return enclosingCandidate;
1537 }
1538
1539 /**
1540 * Returns the simple name of the underlying class as given in the
1541 * source code. Returns an empty string if the underlying class is
1542 * anonymous.
1543 *
1544 * <p>The simple name of an array is the simple name of the
1545 * component type with "[]" appended. In particular the simple
1546 * name of an array whose component type is anonymous is "[]".
1547 *
1548 * @return the simple name of the underlying class
1549 * @since 1.5
1550 */
1551 public String getSimpleName() {
1552 ReflectionData<T> rd = reflectionData();
1553 String simpleName = rd.simpleName;
1554 if (simpleName == null) {
1555 rd.simpleName = simpleName = getSimpleName0();
1556 }
1557 return simpleName;
1558 }
1559
1560 private String getSimpleName0() {
1561 if (isArray()) {
1562 return getComponentType().getSimpleName() + "[]";
1563 }
1564 String simpleName = getSimpleBinaryName();
1565 if (simpleName == null) { // top level class
1566 simpleName = getName();
1567 simpleName = simpleName.substring(simpleName.lastIndexOf('.') + 1); // strip the package name
1568 }
1569 return simpleName;
1570 }
1571
1572 /**
1573 * Return an informative string for the name of this type.
1574 *
1575 * @return an informative string for the name of this type
1576 * @since 1.8
1577 */
1578 public String getTypeName() {
1579 if (isArray()) {
1580 try {
1581 Class<?> cl = this;
1582 int dimensions = 0;
1583 do {
1584 dimensions++;
1585 cl = cl.getComponentType();
1586 } while (cl.isArray());
1587 StringBuilder sb = new StringBuilder();
1588 sb.append(cl.getName());
1589 for (int i = 0; i < dimensions; i++) {
1590 sb.append("[]");
1591 }
1592 return sb.toString();
1593 } catch (Throwable e) { /*FALLTHRU*/ }
1594 }
1595 return getName();
1596 }
1597
1598 /**
1599 * Returns the canonical name of the underlying class as
1600 * defined by the Java Language Specification. Returns null if
1601 * the underlying class does not have a canonical name (i.e., if
1602 * it is a local or anonymous class or an array whose component
1603 * type does not have a canonical name).
1604 * @return the canonical name of the underlying class if it exists, and
1605 * {@code null} otherwise.
1606 * @since 1.5
1607 */
1608 public String getCanonicalName() {
1609 ReflectionData<T> rd = reflectionData();
1610 String canonicalName = rd.canonicalName;
1611 if (canonicalName == null) {
1612 rd.canonicalName = canonicalName = getCanonicalName0();
1613 }
1614 return canonicalName == ReflectionData.NULL_SENTINEL? null : canonicalName;
1615 }
1616
1617 private String getCanonicalName0() {
1618 if (isArray()) {
1619 String canonicalName = getComponentType().getCanonicalName();
1620 if (canonicalName != null)
1621 return canonicalName + "[]";
1622 else
1623 return ReflectionData.NULL_SENTINEL;
1624 }
1625 if (isLocalOrAnonymousClass())
1626 return ReflectionData.NULL_SENTINEL;
1627 Class<?> enclosingClass = getEnclosingClass();
1628 if (enclosingClass == null) { // top level class
1629 return getName();
1630 } else {
1631 String enclosingName = enclosingClass.getCanonicalName();
1632 if (enclosingName == null)
1633 return ReflectionData.NULL_SENTINEL;
1634 return enclosingName + "." + getSimpleName();
1635 }
1636 }
1637
1638 /**
1639 * Returns {@code true} if and only if the underlying class
1640 * is an anonymous class.
1641 *
1642 * @return {@code true} if and only if this class is an anonymous class.
1643 * @since 1.5
1644 */
1645 public boolean isAnonymousClass() {
1646 return !isArray() && isLocalOrAnonymousClass() &&
1647 getSimpleBinaryName0() == null;
1648 }
1649
1650 /**
1651 * Returns {@code true} if and only if the underlying class
1652 * is a local class.
1653 *
1654 * @return {@code true} if and only if this class is a local class.
1655 * @since 1.5
1656 */
1657 public boolean isLocalClass() {
1658 return isLocalOrAnonymousClass() &&
1659 (isArray() || getSimpleBinaryName0() != null);
1660 }
1661
1662 /**
1663 * Returns {@code true} if and only if the underlying class
1664 * is a member class.
1665 *
1666 * @return {@code true} if and only if this class is a member class.
1667 * @since 1.5
1668 */
1669 public boolean isMemberClass() {
1670 return !isLocalOrAnonymousClass() && getDeclaringClass0() != null;
1671 }
1672
1673 /**
1674 * Returns the "simple binary name" of the underlying class, i.e.,
1675 * the binary name without the leading enclosing class name.
1676 * Returns {@code null} if the underlying class is a top level
1677 * class.
1678 */
1679 private String getSimpleBinaryName() {
1680 if (isTopLevelClass())
1681 return null;
1682 String name = getSimpleBinaryName0();
1683 if (name == null) // anonymous class
1684 return "";
1685 return name;
1686 }
1687
1688 private native String getSimpleBinaryName0();
1689
1690 /**
1691 * Returns {@code true} if this is a top level class. Returns {@code false}
1692 * otherwise.
1693 */
1694 private boolean isTopLevelClass() {
1695 return !isLocalOrAnonymousClass() && getDeclaringClass0() == null;
1696 }
1697
1698 /**
1699 * Returns {@code true} if this is a local class or an anonymous
1700 * class. Returns {@code false} otherwise.
1701 */
1702 private boolean isLocalOrAnonymousClass() {
1703 // JVM Spec 4.7.7: A class must have an EnclosingMethod
1704 // attribute if and only if it is a local class or an
1705 // anonymous class.
1706 return hasEnclosingMethodInfo();
1707 }
1708
1709 private boolean hasEnclosingMethodInfo() {
1710 Object[] enclosingInfo = getEnclosingMethod0();
1711 if (enclosingInfo != null) {
1712 EnclosingMethodInfo.validate(enclosingInfo);
1713 return true;
1714 }
1715 return false;
1716 }
1717
1718 /**
1719 * Returns an array containing {@code Class} objects representing all
1720 * the public classes and interfaces that are members of the class
1721 * represented by this {@code Class} object. This includes public
1722 * class and interface members inherited from superclasses and public class
1723 * and interface members declared by the class. This method returns an
1724 * array of length 0 if this {@code Class} object has no public member
1725 * classes or interfaces. This method also returns an array of length 0 if
1726 * this {@code Class} object represents a primitive type, an array
1727 * class, or void.
1728 *
1729 * @return the array of {@code Class} objects representing the public
1730 * members of this class
1731 * @throws SecurityException
1732 * If a security manager, <i>s</i>, is present and
1733 * the caller's class loader is not the same as or an
1734 * ancestor of the class loader for the current class and
1735 * invocation of {@link SecurityManager#checkPackageAccess
1736 * s.checkPackageAccess()} denies access to the package
1737 * of this class.
1738 *
1739 * @since 1.1
1740 */
1741 @CallerSensitive
1742 public Class<?>[] getClasses() {
1743 SecurityManager sm = System.getSecurityManager();
1744 if (sm != null) {
1745 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), false);
1746 }
1747
1748 // Privileged so this implementation can look at DECLARED classes,
1749 // something the caller might not have privilege to do. The code here
1750 // is allowed to look at DECLARED classes because (1) it does not hand
1751 // out anything other than public members and (2) public member access
1752 // has already been ok'd by the SecurityManager.
1753
1754 return java.security.AccessController.doPrivileged(
1755 new java.security.PrivilegedAction<>() {
1756 public Class<?>[] run() {
1757 List<Class<?>> list = new ArrayList<>();
1758 Class<?> currentClass = Class.this;
1759 while (currentClass != null) {
1760 for (Class<?> m : currentClass.getDeclaredClasses()) {
1761 if (Modifier.isPublic(m.getModifiers())) {
1762 list.add(m);
1763 }
1764 }
1765 currentClass = currentClass.getSuperclass();
1766 }
1767 return list.toArray(new Class<?>[0]);
1768 }
1769 });
1770 }
1771
1772
1773 /**
1774 * Returns an array containing {@code Field} objects reflecting all
1775 * the accessible public fields of the class or interface represented by
1776 * this {@code Class} object.
1777 *
1778 * <p> If this {@code Class} object represents a class or interface with
1779 * no accessible public fields, then this method returns an array of length
1780 * 0.
1781 *
1782 * <p> If this {@code Class} object represents a class, then this method
1783 * returns the public fields of the class and of all its superclasses and
1784 * superinterfaces.
1785 *
1786 * <p> If this {@code Class} object represents an interface, then this
1787 * method returns the fields of the interface and of all its
1788 * superinterfaces.
1789 *
1790 * <p> If this {@code Class} object represents an array type, a primitive
1791 * type, or void, then this method returns an array of length 0.
1792 *
1793 * <p> The elements in the returned array are not sorted and are not in any
1794 * particular order.
1795 *
1796 * @return the array of {@code Field} objects representing the
1797 * public fields
1798 * @throws SecurityException
1799 * If a security manager, <i>s</i>, is present and
1800 * the caller's class loader is not the same as or an
1801 * ancestor of the class loader for the current class and
1802 * invocation of {@link SecurityManager#checkPackageAccess
1803 * s.checkPackageAccess()} denies access to the package
1804 * of this class.
1805 *
1806 * @since 1.1
1807 * @jls 8.2 Class Members
1808 * @jls 8.3 Field Declarations
1809 */
1810 @CallerSensitive
1811 public Field[] getFields() throws SecurityException {
1812 SecurityManager sm = System.getSecurityManager();
1813 if (sm != null) {
1814 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1815 }
1816 return copyFields(privateGetPublicFields());
1817 }
1818
1819
1820 /**
1821 * Returns an array containing {@code Method} objects reflecting all the
1822 * public methods of the class or interface represented by this {@code
1823 * Class} object, including those declared by the class or interface and
1824 * those inherited from superclasses and superinterfaces.
1825 *
1826 * <p> If this {@code Class} object represents an array type, then the
1827 * returned array has a {@code Method} object for each of the public
1828 * methods inherited by the array type from {@code Object}. It does not
1829 * contain a {@code Method} object for {@code clone()}.
1830 *
1831 * <p> If this {@code Class} object represents an interface then the
1832 * returned array does not contain any implicitly declared methods from
1833 * {@code Object}. Therefore, if no methods are explicitly declared in
1834 * this interface or any of its superinterfaces then the returned array
1835 * has length 0. (Note that a {@code Class} object which represents a class
1836 * always has public methods, inherited from {@code Object}.)
1837 *
1838 * <p> The returned array never contains methods with names "{@code <init>}"
1839 * or "{@code <clinit>}".
1840 *
1841 * <p> The elements in the returned array are not sorted and are not in any
1842 * particular order.
1843 *
1844 * <p> Generally, the result is computed as with the following 4 step algorithm.
1845 * Let C be the class or interface represented by this {@code Class} object:
1846 * <ol>
1847 * <li> A union of methods is composed of:
1848 * <ol type="a">
1849 * <li> C's declared public instance and static methods as returned by
1850 * {@link #getDeclaredMethods()} and filtered to include only public
1851 * methods.</li>
1852 * <li> If C is a class other than {@code Object}, then include the result
1853 * of invoking this algorithm recursively on the superclass of C.</li>
1854 * <li> Include the results of invoking this algorithm recursively on all
1855 * direct superinterfaces of C, but include only instance methods.</li>
1856 * </ol></li>
1857 * <li> Union from step 1 is partitioned into subsets of methods with same
1858 * signature (name, parameter types) and return type.</li>
1859 * <li> Within each such subset only the most specific methods are selected.
1860 * Let method M be a method from a set of methods with same signature
1861 * and return type. M is most specific if there is no such method
1862 * N != M from the same set, such that N is more specific than M.
1863 * N is more specific than M if:
1864 * <ol type="a">
1865 * <li> N is declared by a class and M is declared by an interface; or</li>
1866 * <li> N and M are both declared by classes or both by interfaces and
1867 * N's declaring type is the same as or a subtype of M's declaring type
1868 * (clearly, if M's and N's declaring types are the same type, then
1869 * M and N are the same method).</li>
1870 * </ol></li>
1871 * <li> The result of this algorithm is the union of all selected methods from
1872 * step 3.</li>
1873 * </ol>
1874 *
1875 * @apiNote There may be more than one method with a particular name
1876 * and parameter types in a class because while the Java language forbids a
1877 * class to declare multiple methods with the same signature but different
1878 * return types, the Java virtual machine does not. This
1879 * increased flexibility in the virtual machine can be used to
1880 * implement various language features. For example, covariant
1881 * returns can be implemented with {@linkplain
1882 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
1883 * method and the overriding method would have the same
1884 * signature but different return types.
1885 *
1886 * @return the array of {@code Method} objects representing the
1887 * public methods of this class
1888 * @throws SecurityException
1889 * If a security manager, <i>s</i>, is present and
1890 * the caller's class loader is not the same as or an
1891 * ancestor of the class loader for the current class and
1892 * invocation of {@link SecurityManager#checkPackageAccess
1893 * s.checkPackageAccess()} denies access to the package
1894 * of this class.
1895 *
1896 * @jls 8.2 Class Members
1897 * @jls 8.4 Method Declarations
1898 * @since 1.1
1899 */
1900 @CallerSensitive
1901 public Method[] getMethods() throws SecurityException {
1902 SecurityManager sm = System.getSecurityManager();
1903 if (sm != null) {
1904 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1905 }
1906 return copyMethods(privateGetPublicMethods());
1907 }
1908
1909
1910 /**
1911 * Returns an array containing {@code Constructor} objects reflecting
1912 * all the public constructors of the class represented by this
1913 * {@code Class} object. An array of length 0 is returned if the
1914 * class has no public constructors, or if the class is an array class, or
1915 * if the class reflects a primitive type or void.
1916 *
1917 * Note that while this method returns an array of {@code
1918 * Constructor<T>} objects (that is an array of constructors from
1919 * this class), the return type of this method is {@code
1920 * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
1921 * might be expected. This less informative return type is
1922 * necessary since after being returned from this method, the
1923 * array could be modified to hold {@code Constructor} objects for
1924 * different classes, which would violate the type guarantees of
1925 * {@code Constructor<T>[]}.
1926 *
1927 * @return the array of {@code Constructor} objects representing the
1928 * public constructors of this class
1929 * @throws SecurityException
1930 * If a security manager, <i>s</i>, is present and
1931 * the caller's class loader is not the same as or an
1932 * ancestor of the class loader for the current class and
1933 * invocation of {@link SecurityManager#checkPackageAccess
1934 * s.checkPackageAccess()} denies access to the package
1935 * of this class.
1936 *
1937 * @since 1.1
1938 */
1939 @CallerSensitive
1940 public Constructor<?>[] getConstructors() throws SecurityException {
1941 SecurityManager sm = System.getSecurityManager();
1942 if (sm != null) {
1943 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1944 }
1945 return copyConstructors(privateGetDeclaredConstructors(true));
1946 }
1947
1948
1949 /**
1950 * Returns a {@code Field} object that reflects the specified public member
1951 * field of the class or interface represented by this {@code Class}
1952 * object. The {@code name} parameter is a {@code String} specifying the
1953 * simple name of the desired field.
1954 *
1955 * <p> The field to be reflected is determined by the algorithm that
1956 * follows. Let C be the class or interface represented by this object:
1957 *
1958 * <OL>
1959 * <LI> If C declares a public field with the name specified, that is the
1960 * field to be reflected.</LI>
1961 * <LI> If no field was found in step 1 above, this algorithm is applied
1962 * recursively to each direct superinterface of C. The direct
1963 * superinterfaces are searched in the order they were declared.</LI>
1964 * <LI> If no field was found in steps 1 and 2 above, and C has a
1965 * superclass S, then this algorithm is invoked recursively upon S.
1966 * If C has no superclass, then a {@code NoSuchFieldException}
1967 * is thrown.</LI>
1968 * </OL>
1969 *
1970 * <p> If this {@code Class} object represents an array type, then this
1971 * method does not find the {@code length} field of the array type.
1972 *
1973 * @param name the field name
1974 * @return the {@code Field} object of this class specified by
1975 * {@code name}
1976 * @throws NoSuchFieldException if a field with the specified name is
1977 * not found.
1978 * @throws NullPointerException if {@code name} is {@code null}
1979 * @throws SecurityException
1980 * If a security manager, <i>s</i>, is present and
1981 * the caller's class loader is not the same as or an
1982 * ancestor of the class loader for the current class and
1983 * invocation of {@link SecurityManager#checkPackageAccess
1984 * s.checkPackageAccess()} denies access to the package
1985 * of this class.
1986 *
1987 * @since 1.1
1988 * @jls 8.2 Class Members
1989 * @jls 8.3 Field Declarations
1990 */
1991 @CallerSensitive
1992 public Field getField(String name)
1993 throws NoSuchFieldException, SecurityException {
1994 Objects.requireNonNull(name);
1995 SecurityManager sm = System.getSecurityManager();
1996 if (sm != null) {
1997 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
1998 }
1999 Field field = getField0(name);
2000 if (field == null) {
2001 throw new NoSuchFieldException(name);
2002 }
2003 return getReflectionFactory().copyField(field);
2004 }
2005
2006
2007 /**
2008 * Returns a {@code Method} object that reflects the specified public
2009 * member method of the class or interface represented by this
2010 * {@code Class} object. The {@code name} parameter is a
2011 * {@code String} specifying the simple name of the desired method. The
2012 * {@code parameterTypes} parameter is an array of {@code Class}
2013 * objects that identify the method's formal parameter types, in declared
2014 * order. If {@code parameterTypes} is {@code null}, it is
2015 * treated as if it were an empty array.
2016 *
2017 * <p> If this {@code Class} object represents an array type, then this
2018 * method finds any public method inherited by the array type from
2019 * {@code Object} except method {@code clone()}.
2020 *
2021 * <p> If this {@code Class} object represents an interface then this
2022 * method does not find any implicitly declared method from
2023 * {@code Object}. Therefore, if no methods are explicitly declared in
2024 * this interface or any of its superinterfaces, then this method does not
2025 * find any method.
2026 *
2027 * <p> This method does not find any method with name "{@code <init>}" or
2028 * "{@code <clinit>}".
2029 *
2030 * <p> Generally, the method to be reflected is determined by the 4 step
2031 * algorithm that follows.
2032 * Let C be the class or interface represented by this {@code Class} object:
2033 * <ol>
2034 * <li> A union of methods is composed of:
2035 * <ol type="a">
2036 * <li> C's declared public instance and static methods as returned by
2037 * {@link #getDeclaredMethods()} and filtered to include only public
2038 * methods that match given {@code name} and {@code parameterTypes}</li>
2039 * <li> If C is a class other than {@code Object}, then include the result
2040 * of invoking this algorithm recursively on the superclass of C.</li>
2041 * <li> Include the results of invoking this algorithm recursively on all
2042 * direct superinterfaces of C, but include only instance methods.</li>
2043 * </ol></li>
2044 * <li> This union is partitioned into subsets of methods with same
2045 * return type (the selection of methods from step 1 also guarantees that
2046 * they have the same method name and parameter types).</li>
2047 * <li> Within each such subset only the most specific methods are selected.
2048 * Let method M be a method from a set of methods with same VM
2049 * signature (return type, name, parameter types).
2050 * M is most specific if there is no such method N != M from the same
2051 * set, such that N is more specific than M. N is more specific than M
2052 * if:
2053 * <ol type="a">
2054 * <li> N is declared by a class and M is declared by an interface; or</li>
2055 * <li> N and M are both declared by classes or both by interfaces and
2056 * N's declaring type is the same as or a subtype of M's declaring type
2057 * (clearly, if M's and N's declaring types are the same type, then
2058 * M and N are the same method).</li>
2059 * </ol></li>
2060 * <li> The result of this algorithm is chosen arbitrarily from the methods
2061 * with most specific return type among all selected methods from step 3.
2062 * Let R be a return type of a method M from the set of all selected methods
2063 * from step 3. M is a method with most specific return type if there is
2064 * no such method N != M from the same set, having return type S != R,
2065 * such that S is a subtype of R as determined by
2066 * R.class.{@link #isAssignableFrom}(S.class).
2067 * </ol>
2068 *
2069 * @apiNote There may be more than one method with matching name and
2070 * parameter types in a class because while the Java language forbids a
2071 * class to declare multiple methods with the same signature but different
2072 * return types, the Java virtual machine does not. This
2073 * increased flexibility in the virtual machine can be used to
2074 * implement various language features. For example, covariant
2075 * returns can be implemented with {@linkplain
2076 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
2077 * method and the overriding method would have the same
2078 * signature but different return types. This method would return the
2079 * overriding method as it would have a more specific return type.
2080 *
2081 * @param name the name of the method
2082 * @param parameterTypes the list of parameters
2083 * @return the {@code Method} object that matches the specified
2084 * {@code name} and {@code parameterTypes}
2085 * @throws NoSuchMethodException if a matching method is not found
2086 * or if the name is "<init>"or "<clinit>".
2087 * @throws NullPointerException if {@code name} is {@code null}
2088 * @throws SecurityException
2089 * If a security manager, <i>s</i>, is present and
2090 * the caller's class loader is not the same as or an
2091 * ancestor of the class loader for the current class and
2092 * invocation of {@link SecurityManager#checkPackageAccess
2093 * s.checkPackageAccess()} denies access to the package
2094 * of this class.
2095 *
2096 * @jls 8.2 Class Members
2097 * @jls 8.4 Method Declarations
2098 * @since 1.1
2099 */
2100 @CallerSensitive
2101 public Method getMethod(String name, Class<?>... parameterTypes)
2102 throws NoSuchMethodException, SecurityException {
2103 Objects.requireNonNull(name);
2104 SecurityManager sm = System.getSecurityManager();
2105 if (sm != null) {
2106 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2107 }
2108 Method method = getMethod0(name, parameterTypes);
2109 if (method == null) {
2110 throw new NoSuchMethodException(methodToString(name, parameterTypes));
2111 }
2112 return getReflectionFactory().copyMethod(method);
2113 }
2114
2115 /**
2116 * Returns a {@code Constructor} object that reflects the specified
2117 * public constructor of the class represented by this {@code Class}
2118 * object. The {@code parameterTypes} parameter is an array of
2119 * {@code Class} objects that identify the constructor's formal
2120 * parameter types, in declared order.
2121 *
2122 * If this {@code Class} object represents an inner class
2123 * declared in a non-static context, the formal parameter types
2124 * include the explicit enclosing instance as the first parameter.
2125 *
2126 * <p> The constructor to reflect is the public constructor of the class
2127 * represented by this {@code Class} object whose formal parameter
2128 * types match those specified by {@code parameterTypes}.
2129 *
2130 * @param parameterTypes the parameter array
2131 * @return the {@code Constructor} object of the public constructor that
2132 * matches the specified {@code parameterTypes}
2133 * @throws NoSuchMethodException if a matching method is not found.
2134 * @throws SecurityException
2135 * If a security manager, <i>s</i>, is present and
2136 * the caller's class loader is not the same as or an
2137 * ancestor of the class loader for the current class and
2138 * invocation of {@link SecurityManager#checkPackageAccess
2139 * s.checkPackageAccess()} denies access to the package
2140 * of this class.
2141 *
2142 * @since 1.1
2143 */
2144 @CallerSensitive
2145 public Constructor<T> getConstructor(Class<?>... parameterTypes)
2146 throws NoSuchMethodException, SecurityException
2147 {
2148 SecurityManager sm = System.getSecurityManager();
2149 if (sm != null) {
2150 checkMemberAccess(sm, Member.PUBLIC, Reflection.getCallerClass(), true);
2151 }
2152 return getReflectionFactory().copyConstructor(
2153 getConstructor0(parameterTypes, Member.PUBLIC));
2154 }
2155
2156
2157 /**
2158 * Returns an array of {@code Class} objects reflecting all the
2159 * classes and interfaces declared as members of the class represented by
2160 * this {@code Class} object. This includes public, protected, default
2161 * (package) access, and private classes and interfaces declared by the
2162 * class, but excludes inherited classes and interfaces. This method
2163 * returns an array of length 0 if the class declares no classes or
2164 * interfaces as members, or if this {@code Class} object represents a
2165 * primitive type, an array class, or void.
2166 *
2167 * @return the array of {@code Class} objects representing all the
2168 * declared members of this class
2169 * @throws SecurityException
2170 * If a security manager, <i>s</i>, is present and any of the
2171 * following conditions is met:
2172 *
2173 * <ul>
2174 *
2175 * <li> the caller's class loader is not the same as the
2176 * class loader of this class and invocation of
2177 * {@link SecurityManager#checkPermission
2178 * s.checkPermission} method with
2179 * {@code RuntimePermission("accessDeclaredMembers")}
2180 * denies access to the declared classes within this class
2181 *
2182 * <li> the caller's class loader is not the same as or an
2183 * ancestor of the class loader for the current class and
2184 * invocation of {@link SecurityManager#checkPackageAccess
2185 * s.checkPackageAccess()} denies access to the package
2186 * of this class
2187 *
2188 * </ul>
2189 *
2190 * @since 1.1
2191 */
2192 @CallerSensitive
2193 public Class<?>[] getDeclaredClasses() throws SecurityException {
2194 SecurityManager sm = System.getSecurityManager();
2195 if (sm != null) {
2196 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), false);
2197 }
2198 return getDeclaredClasses0();
2199 }
2200
2201
2202 /**
2203 * Returns an array of {@code Field} objects reflecting all the fields
2204 * declared by the class or interface represented by this
2205 * {@code Class} object. This includes public, protected, default
2206 * (package) access, and private fields, but excludes inherited fields.
2207 *
2208 * <p> If this {@code Class} object represents a class or interface with no
2209 * declared fields, then this method returns an array of length 0.
2210 *
2211 * <p> If this {@code Class} object represents an array type, a primitive
2212 * type, or void, then this method returns an array of length 0.
2213 *
2214 * <p> The elements in the returned array are not sorted and are not in any
2215 * particular order.
2216 *
2217 * @return the array of {@code Field} objects representing all the
2218 * declared fields of this class
2219 * @throws SecurityException
2220 * If a security manager, <i>s</i>, is present and any of the
2221 * following conditions is met:
2222 *
2223 * <ul>
2224 *
2225 * <li> the caller's class loader is not the same as the
2226 * class loader of this class and invocation of
2227 * {@link SecurityManager#checkPermission
2228 * s.checkPermission} method with
2229 * {@code RuntimePermission("accessDeclaredMembers")}
2230 * denies access to the declared fields within this class
2231 *
2232 * <li> the caller's class loader is not the same as or an
2233 * ancestor of the class loader for the current class and
2234 * invocation of {@link SecurityManager#checkPackageAccess
2235 * s.checkPackageAccess()} denies access to the package
2236 * of this class
2237 *
2238 * </ul>
2239 *
2240 * @since 1.1
2241 * @jls 8.2 Class Members
2242 * @jls 8.3 Field Declarations
2243 */
2244 @CallerSensitive
2245 public Field[] getDeclaredFields() throws SecurityException {
2246 SecurityManager sm = System.getSecurityManager();
2247 if (sm != null) {
2248 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2249 }
2250 return copyFields(privateGetDeclaredFields(false));
2251 }
2252
2253
2254 /**
2255 * Returns an array containing {@code Method} objects reflecting all the
2256 * declared methods of the class or interface represented by this {@code
2257 * Class} object, including public, protected, default (package)
2258 * access, and private methods, but excluding inherited methods.
2259 *
2260 * <p> If this {@code Class} object represents a type that has multiple
2261 * declared methods with the same name and parameter types, but different
2262 * return types, then the returned array has a {@code Method} object for
2263 * each such method.
2264 *
2265 * <p> If this {@code Class} object represents a type that has a class
2266 * initialization method {@code <clinit>}, then the returned array does
2267 * <em>not</em> have a corresponding {@code Method} object.
2268 *
2269 * <p> If this {@code Class} object represents a class or interface with no
2270 * declared methods, then the returned array has length 0.
2271 *
2272 * <p> If this {@code Class} object represents an array type, a primitive
2273 * type, or void, then the returned array has length 0.
2274 *
2275 * <p> The elements in the returned array are not sorted and are not in any
2276 * particular order.
2277 *
2278 * @return the array of {@code Method} objects representing all the
2279 * declared methods of this class
2280 * @throws SecurityException
2281 * If a security manager, <i>s</i>, is present and any of the
2282 * following conditions is met:
2283 *
2284 * <ul>
2285 *
2286 * <li> the caller's class loader is not the same as the
2287 * class loader of this class and invocation of
2288 * {@link SecurityManager#checkPermission
2289 * s.checkPermission} method with
2290 * {@code RuntimePermission("accessDeclaredMembers")}
2291 * denies access to the declared methods within this class
2292 *
2293 * <li> the caller's class loader is not the same as or an
2294 * ancestor of the class loader for the current class and
2295 * invocation of {@link SecurityManager#checkPackageAccess
2296 * s.checkPackageAccess()} denies access to the package
2297 * of this class
2298 *
2299 * </ul>
2300 *
2301 * @jls 8.2 Class Members
2302 * @jls 8.4 Method Declarations
2303 * @since 1.1
2304 */
2305 @CallerSensitive
2306 public Method[] getDeclaredMethods() throws SecurityException {
2307 SecurityManager sm = System.getSecurityManager();
2308 if (sm != null) {
2309 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2310 }
2311 return copyMethods(privateGetDeclaredMethods(false));
2312 }
2313
2314
2315 /**
2316 * Returns an array of {@code Constructor} objects reflecting all the
2317 * constructors declared by the class represented by this
2318 * {@code Class} object. These are public, protected, default
2319 * (package) access, and private constructors. The elements in the array
2320 * returned are not sorted and are not in any particular order. If the
2321 * class has a default constructor, it is included in the returned array.
2322 * This method returns an array of length 0 if this {@code Class}
2323 * object represents an interface, a primitive type, an array class, or
2324 * void.
2325 *
2326 * <p> See <em>The Java Language Specification</em>, section 8.2.
2327 *
2328 * @return the array of {@code Constructor} objects representing all the
2329 * declared constructors of this class
2330 * @throws SecurityException
2331 * If a security manager, <i>s</i>, is present and any of the
2332 * following conditions is met:
2333 *
2334 * <ul>
2335 *
2336 * <li> the caller's class loader is not the same as the
2337 * class loader of this class and invocation of
2338 * {@link SecurityManager#checkPermission
2339 * s.checkPermission} method with
2340 * {@code RuntimePermission("accessDeclaredMembers")}
2341 * denies access to the declared constructors within this class
2342 *
2343 * <li> the caller's class loader is not the same as or an
2344 * ancestor of the class loader for the current class and
2345 * invocation of {@link SecurityManager#checkPackageAccess
2346 * s.checkPackageAccess()} denies access to the package
2347 * of this class
2348 *
2349 * </ul>
2350 *
2351 * @since 1.1
2352 */
2353 @CallerSensitive
2354 public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
2355 SecurityManager sm = System.getSecurityManager();
2356 if (sm != null) {
2357 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2358 }
2359 return copyConstructors(privateGetDeclaredConstructors(false));
2360 }
2361
2362
2363 /**
2364 * Returns a {@code Field} object that reflects the specified declared
2365 * field of the class or interface represented by this {@code Class}
2366 * object. The {@code name} parameter is a {@code String} that specifies
2367 * the simple name of the desired field.
2368 *
2369 * <p> If this {@code Class} object represents an array type, then this
2370 * method does not find the {@code length} field of the array type.
2371 *
2372 * @param name the name of the field
2373 * @return the {@code Field} object for the specified field in this
2374 * class
2375 * @throws NoSuchFieldException if a field with the specified name is
2376 * not found.
2377 * @throws NullPointerException if {@code name} is {@code null}
2378 * @throws SecurityException
2379 * If a security manager, <i>s</i>, is present and any of the
2380 * following conditions is met:
2381 *
2382 * <ul>
2383 *
2384 * <li> the caller's class loader is not the same as the
2385 * class loader of this class and invocation of
2386 * {@link SecurityManager#checkPermission
2387 * s.checkPermission} method with
2388 * {@code RuntimePermission("accessDeclaredMembers")}
2389 * denies access to the declared field
2390 *
2391 * <li> the caller's class loader is not the same as or an
2392 * ancestor of the class loader for the current class and
2393 * invocation of {@link SecurityManager#checkPackageAccess
2394 * s.checkPackageAccess()} denies access to the package
2395 * of this class
2396 *
2397 * </ul>
2398 *
2399 * @since 1.1
2400 * @jls 8.2 Class Members
2401 * @jls 8.3 Field Declarations
2402 */
2403 @CallerSensitive
2404 public Field getDeclaredField(String name)
2405 throws NoSuchFieldException, SecurityException {
2406 Objects.requireNonNull(name);
2407 SecurityManager sm = System.getSecurityManager();
2408 if (sm != null) {
2409 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2410 }
2411 Field field = searchFields(privateGetDeclaredFields(false), name);
2412 if (field == null) {
2413 throw new NoSuchFieldException(name);
2414 }
2415 return getReflectionFactory().copyField(field);
2416 }
2417
2418
2419 /**
2420 * Returns a {@code Method} object that reflects the specified
2421 * declared method of the class or interface represented by this
2422 * {@code Class} object. The {@code name} parameter is a
2423 * {@code String} that specifies the simple name of the desired
2424 * method, and the {@code parameterTypes} parameter is an array of
2425 * {@code Class} objects that identify the method's formal parameter
2426 * types, in declared order. If more than one method with the same
2427 * parameter types is declared in a class, and one of these methods has a
2428 * return type that is more specific than any of the others, that method is
2429 * returned; otherwise one of the methods is chosen arbitrarily. If the
2430 * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
2431 * is raised.
2432 *
2433 * <p> If this {@code Class} object represents an array type, then this
2434 * method does not find the {@code clone()} method.
2435 *
2436 * @param name the name of the method
2437 * @param parameterTypes the parameter array
2438 * @return the {@code Method} object for the method of this class
2439 * matching the specified name and parameters
2440 * @throws NoSuchMethodException if a matching method is not found.
2441 * @throws NullPointerException if {@code name} is {@code null}
2442 * @throws SecurityException
2443 * If a security manager, <i>s</i>, is present and any of the
2444 * following conditions is met:
2445 *
2446 * <ul>
2447 *
2448 * <li> the caller's class loader is not the same as the
2449 * class loader of this class and invocation of
2450 * {@link SecurityManager#checkPermission
2451 * s.checkPermission} method with
2452 * {@code RuntimePermission("accessDeclaredMembers")}
2453 * denies access to the declared method
2454 *
2455 * <li> the caller's class loader is not the same as or an
2456 * ancestor of the class loader for the current class and
2457 * invocation of {@link SecurityManager#checkPackageAccess
2458 * s.checkPackageAccess()} denies access to the package
2459 * of this class
2460 *
2461 * </ul>
2462 *
2463 * @jls 8.2 Class Members
2464 * @jls 8.4 Method Declarations
2465 * @since 1.1
2466 */
2467 @CallerSensitive
2468 public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
2469 throws NoSuchMethodException, SecurityException {
2470 Objects.requireNonNull(name);
2471 SecurityManager sm = System.getSecurityManager();
2472 if (sm != null) {
2473 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2474 }
2475 Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
2476 if (method == null) {
2477 throw new NoSuchMethodException(methodToString(name, parameterTypes));
2478 }
2479 return getReflectionFactory().copyMethod(method);
2480 }
2481
2482 /**
2483 * Returns the list of {@code Method} objects for the declared public
2484 * methods of this class or interface that have the specified method name
2485 * and parameter types.
2486 *
2487 * @param name the name of the method
2488 * @param parameterTypes the parameter array
2489 * @return the list of {@code Method} objects for the public methods of
2490 * this class matching the specified name and parameters
2491 */
2492 List<Method> getDeclaredPublicMethods(String name, Class<?>... parameterTypes) {
2493 Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
2494 ReflectionFactory factory = getReflectionFactory();
2495 List<Method> result = new ArrayList<>();
2496 for (Method method : methods) {
2497 if (method.getName().equals(name)
2498 && Arrays.equals(
2499 factory.getExecutableSharedParameterTypes(method),
2500 parameterTypes)) {
2501 result.add(factory.copyMethod(method));
2502 }
2503 }
2504 return result;
2505 }
2506
2507 /**
2508 * Returns a {@code Constructor} object that reflects the specified
2509 * constructor of the class or interface represented by this
2510 * {@code Class} object. The {@code parameterTypes} parameter is
2511 * an array of {@code Class} objects that identify the constructor's
2512 * formal parameter types, in declared order.
2513 *
2514 * If this {@code Class} object represents an inner class
2515 * declared in a non-static context, the formal parameter types
2516 * include the explicit enclosing instance as the first parameter.
2517 *
2518 * @param parameterTypes the parameter array
2519 * @return The {@code Constructor} object for the constructor with the
2520 * specified parameter list
2521 * @throws NoSuchMethodException if a matching method is not found.
2522 * @throws SecurityException
2523 * If a security manager, <i>s</i>, is present and any of the
2524 * following conditions is met:
2525 *
2526 * <ul>
2527 *
2528 * <li> the caller's class loader is not the same as the
2529 * class loader of this class and invocation of
2530 * {@link SecurityManager#checkPermission
2531 * s.checkPermission} method with
2532 * {@code RuntimePermission("accessDeclaredMembers")}
2533 * denies access to the declared constructor
2534 *
2535 * <li> the caller's class loader is not the same as or an
2536 * ancestor of the class loader for the current class and
2537 * invocation of {@link SecurityManager#checkPackageAccess
2538 * s.checkPackageAccess()} denies access to the package
2539 * of this class
2540 *
2541 * </ul>
2542 *
2543 * @since 1.1
2544 */
2545 @CallerSensitive
2546 public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
2547 throws NoSuchMethodException, SecurityException
2548 {
2549 SecurityManager sm = System.getSecurityManager();
2550 if (sm != null) {
2551 checkMemberAccess(sm, Member.DECLARED, Reflection.getCallerClass(), true);
2552 }
2553
2554 return getReflectionFactory().copyConstructor(
2555 getConstructor0(parameterTypes, Member.DECLARED));
2556 }
2557
2558 /**
2559 * Finds a resource with a given name.
2560 *
2561 * <p> If this class is in a named {@link Module Module} then this method
2562 * will attempt to find the resource in the module. This is done by
2563 * delegating to the module's class loader {@link
2564 * ClassLoader#findResource(String,String) findResource(String,String)}
2565 * method, invoking it with the module name and the absolute name of the
2566 * resource. Resources in named modules are subject to the rules for
2567 * encapsulation specified in the {@code Module} {@link
2568 * Module#getResourceAsStream getResourceAsStream} method and so this
2569 * method returns {@code null} when the resource is a
2570 * non-"{@code .class}" resource in a package that is not open to the
2571 * caller's module.
2572 *
2573 * <p> Otherwise, if this class is not in a named module then the rules for
2574 * searching resources associated with a given class are implemented by the
2575 * defining {@linkplain ClassLoader class loader} of the class. This method
2576 * delegates to this object's class loader. If this object was loaded by
2577 * the bootstrap class loader, the method delegates to {@link
2578 * ClassLoader#getSystemResourceAsStream}.
2579 *
2580 * <p> Before delegation, an absolute resource name is constructed from the
2581 * given resource name using this algorithm:
2582 *
2583 * <ul>
2584 *
2585 * <li> If the {@code name} begins with a {@code '/'}
2586 * (<code>'\u002f'</code>), then the absolute name of the resource is the
2587 * portion of the {@code name} following the {@code '/'}.
2588 *
2589 * <li> Otherwise, the absolute name is of the following form:
2590 *
2591 * <blockquote>
2592 * {@code modified_package_name/name}
2593 * </blockquote>
2594 *
2595 * <p> Where the {@code modified_package_name} is the package name of this
2596 * object with {@code '/'} substituted for {@code '.'}
2597 * (<code>'\u002e'</code>).
2598 *
2599 * </ul>
2600 *
2601 * @param name name of the desired resource
2602 * @return A {@link java.io.InputStream} object; {@code null} if no
2603 * resource with this name is found, the resource is in a package
2604 * that is not {@linkplain Module#isOpen(String, Module) open} to at
2605 * least the caller module, or access to the resource is denied
2606 * by the security manager.
2607 * @throws NullPointerException If {@code name} is {@code null}
2608 *
2609 * @see Module#getResourceAsStream(String)
2610 * @since 1.1
2611 * @revised 9
2612 * @spec JPMS
2613 */
2614 @CallerSensitive
2615 public InputStream getResourceAsStream(String name) {
2616 name = resolveName(name);
2617
2618 Module thisModule = getModule();
2619 if (thisModule.isNamed()) {
2620 // check if resource can be located by caller
2621 if (Resources.canEncapsulate(name)
2622 && !isOpenToCaller(name, Reflection.getCallerClass())) {
2623 return null;
2624 }
2625
2626 // resource not encapsulated or in package open to caller
2627 String mn = thisModule.getName();
2628 ClassLoader cl = getClassLoader0();
2629 try {
2630
2631 // special-case built-in class loaders to avoid the
2632 // need for a URL connection
2633 if (cl == null) {
2634 return BootLoader.findResourceAsStream(mn, name);
2635 } else if (cl instanceof BuiltinClassLoader) {
2636 return ((BuiltinClassLoader) cl).findResourceAsStream(mn, name);
2637 } else {
2638 URL url = cl.findResource(mn, name);
2639 return (url != null) ? url.openStream() : null;
2640 }
2641
2642 } catch (IOException | SecurityException e) {
2643 return null;
2644 }
2645 }
2646
2647 // unnamed module
2648 ClassLoader cl = getClassLoader0();
2649 if (cl == null) {
2650 return ClassLoader.getSystemResourceAsStream(name);
2651 } else {
2652 return cl.getResourceAsStream(name);
2653 }
2654 }
2655
2656 /**
2657 * Finds a resource with a given name.
2658 *
2659 * <p> If this class is in a named {@link Module Module} then this method
2660 * will attempt to find the resource in the module. This is done by
2661 * delegating to the module's class loader {@link
2662 * ClassLoader#findResource(String,String) findResource(String,String)}
2663 * method, invoking it with the module name and the absolute name of the
2664 * resource. Resources in named modules are subject to the rules for
2665 * encapsulation specified in the {@code Module} {@link
2666 * Module#getResourceAsStream getResourceAsStream} method and so this
2667 * method returns {@code null} when the resource is a
2668 * non-"{@code .class}" resource in a package that is not open to the
2669 * caller's module.
2670 *
2671 * <p> Otherwise, if this class is not in a named module then the rules for
2672 * searching resources associated with a given class are implemented by the
2673 * defining {@linkplain ClassLoader class loader} of the class. This method
2674 * delegates to this object's class loader. If this object was loaded by
2675 * the bootstrap class loader, the method delegates to {@link
2676 * ClassLoader#getSystemResource}.
2677 *
2678 * <p> Before delegation, an absolute resource name is constructed from the
2679 * given resource name using this algorithm:
2680 *
2681 * <ul>
2682 *
2683 * <li> If the {@code name} begins with a {@code '/'}
2684 * (<code>'\u002f'</code>), then the absolute name of the resource is the
2685 * portion of the {@code name} following the {@code '/'}.
2686 *
2687 * <li> Otherwise, the absolute name is of the following form:
2688 *
2689 * <blockquote>
2690 * {@code modified_package_name/name}
2691 * </blockquote>
2692 *
2693 * <p> Where the {@code modified_package_name} is the package name of this
2694 * object with {@code '/'} substituted for {@code '.'}
2695 * (<code>'\u002e'</code>).
2696 *
2697 * </ul>
2698 *
2699 * @param name name of the desired resource
2700 * @return A {@link java.net.URL} object; {@code null} if no resource with
2701 * this name is found, the resource cannot be located by a URL, the
2702 * resource is in a package that is not
2703 * {@linkplain Module#isOpen(String, Module) open} to at least the caller
2704 * module, or access to the resource is denied by the security
2705 * manager.
2706 * @throws NullPointerException If {@code name} is {@code null}
2707 * @since 1.1
2708 * @revised 9
2709 * @spec JPMS
2710 */
2711 @CallerSensitive
2712 public URL getResource(String name) {
2713 name = resolveName(name);
2714
2715 Module thisModule = getModule();
2716 if (thisModule.isNamed()) {
2717 // check if resource can be located by caller
2718 if (Resources.canEncapsulate(name)
2719 && !isOpenToCaller(name, Reflection.getCallerClass())) {
2720 return null;
2721 }
2722
2723 // resource not encapsulated or in package open to caller
2724 String mn = thisModule.getName();
2725 ClassLoader cl = getClassLoader0();
2726 try {
2727 if (cl == null) {
2728 return BootLoader.findResource(mn, name);
2729 } else {
2730 return cl.findResource(mn, name);
2731 }
2732 } catch (IOException ioe) {
2733 return null;
2734 }
2735 }
2736
2737 // unnamed module
2738 ClassLoader cl = getClassLoader0();
2739 if (cl == null) {
2740 return ClassLoader.getSystemResource(name);
2741 } else {
2742 return cl.getResource(name);
2743 }
2744 }
2745
2746 /**
2747 * Returns true if a resource with the given name can be located by the
2748 * given caller. All resources in a module can be located by code in
2749 * the module. For other callers, then the package needs to be open to
2750 * the caller.
2751 */
2752 private boolean isOpenToCaller(String name, Class<?> caller) {
2753 // assert getModule().isNamed();
2754 Module thisModule = getModule();
2755 Module callerModule = (caller != null) ? caller.getModule() : null;
2756 if (callerModule != thisModule) {
2757 String pn = Resources.toPackageName(name);
2758 if (thisModule.getDescriptor().packages().contains(pn)) {
2759 if (callerModule == null && !thisModule.isOpen(pn)) {
2760 // no caller, package not open
2761 return false;
2762 }
2763 if (!thisModule.isOpen(pn, callerModule)) {
2764 // package not open to caller
2765 return false;
2766 }
2767 }
2768 }
2769 return true;
2770 }
2771
2772
2773 /** protection domain returned when the internal domain is null */
2774 private static java.security.ProtectionDomain allPermDomain;
2775
2776 /**
2777 * Returns the {@code ProtectionDomain} of this class. If there is a
2778 * security manager installed, this method first calls the security
2779 * manager's {@code checkPermission} method with a
2780 * {@code RuntimePermission("getProtectionDomain")} permission to
2781 * ensure it's ok to get the
2782 * {@code ProtectionDomain}.
2783 *
2784 * @return the ProtectionDomain of this class
2785 *
2786 * @throws SecurityException
2787 * if a security manager exists and its
2788 * {@code checkPermission} method doesn't allow
2789 * getting the ProtectionDomain.
2790 *
2791 * @see java.security.ProtectionDomain
2792 * @see SecurityManager#checkPermission
2793 * @see java.lang.RuntimePermission
2794 * @since 1.2
2795 */
2796 public java.security.ProtectionDomain getProtectionDomain() {
2797 SecurityManager sm = System.getSecurityManager();
2798 if (sm != null) {
2799 sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
2800 }
2801 java.security.ProtectionDomain pd = getProtectionDomain0();
2802 if (pd == null) {
2803 if (allPermDomain == null) {
2804 java.security.Permissions perms =
2805 new java.security.Permissions();
2806 perms.add(SecurityConstants.ALL_PERMISSION);
2807 allPermDomain =
2808 new java.security.ProtectionDomain(null, perms);
2809 }
2810 pd = allPermDomain;
2811 }
2812 return pd;
2813 }
2814
2815
2816 /**
2817 * Returns the ProtectionDomain of this class.
2818 */
2819 private native java.security.ProtectionDomain getProtectionDomain0();
2820
2821 /*
2822 * Return the Virtual Machine's Class object for the named
2823 * primitive type.
2824 */
2825 static native Class<?> getPrimitiveClass(String name);
2826
2827 /*
2828 * Check if client is allowed to access members. If access is denied,
2829 * throw a SecurityException.
2830 *
2831 * This method also enforces package access.
2832 *
2833 * <p> Default policy: allow all clients access with normal Java access
2834 * control.
2835 *
2836 * <p> NOTE: should only be called if a SecurityManager is installed
2837 */
2838 private void checkMemberAccess(SecurityManager sm, int which,
2839 Class<?> caller, boolean checkProxyInterfaces) {
2840 /* Default policy allows access to all {@link Member#PUBLIC} members,
2841 * as well as access to classes that have the same class loader as the caller.
2842 * In all other cases, it requires RuntimePermission("accessDeclaredMembers")
2843 * permission.
2844 */
2845 final ClassLoader ccl = ClassLoader.getClassLoader(caller);
2846 if (which != Member.PUBLIC) {
2847 final ClassLoader cl = getClassLoader0();
2848 if (ccl != cl) {
2849 sm.checkPermission(SecurityConstants.CHECK_MEMBER_ACCESS_PERMISSION);
2850 }
2851 }
2852 this.checkPackageAccess(sm, ccl, checkProxyInterfaces);
2853 }
2854
2855 /*
2856 * Checks if a client loaded in ClassLoader ccl is allowed to access this
2857 * class under the current package access policy. If access is denied,
2858 * throw a SecurityException.
2859 *
2860 * NOTE: this method should only be called if a SecurityManager is active
2861 */
2862 private void checkPackageAccess(SecurityManager sm, final ClassLoader ccl,
2863 boolean checkProxyInterfaces) {
2864 final ClassLoader cl = getClassLoader0();
2865
2866 if (ReflectUtil.needsPackageAccessCheck(ccl, cl)) {
2867 String pkg = this.getPackageName();
2868 if (pkg != null && !pkg.isEmpty()) {
2869 // skip the package access check on a proxy class in default proxy package
2870 if (!Proxy.isProxyClass(this) || ReflectUtil.isNonPublicProxyClass(this)) {
2871 sm.checkPackageAccess(pkg);
2872 }
2873 }
2874 }
2875 // check package access on the proxy interfaces
2876 if (checkProxyInterfaces && Proxy.isProxyClass(this)) {
2877 ReflectUtil.checkProxyPackageAccess(ccl, this.getInterfaces());
2878 }
2879 }
2880
2881 /**
2882 * Add a package name prefix if the name is not absolute Remove leading "/"
2883 * if name is absolute
2884 */
2885 private String resolveName(String name) {
2886 if (!name.startsWith("/")) {
2887 Class<?> c = this;
2888 while (c.isArray()) {
2889 c = c.getComponentType();
2890 }
2891 String baseName = c.getPackageName();
2892 if (baseName != null && !baseName.isEmpty()) {
2893 name = baseName.replace('.', '/') + "/" + name;
2894 }
2895 } else {
2896 name = name.substring(1);
2897 }
2898 return name;
2899 }
2900
2901 /**
2902 * Atomic operations support.
2903 */
2904 private static class Atomic {
2905 // initialize Unsafe machinery here, since we need to call Class.class instance method
2906 // and have to avoid calling it in the static initializer of the Class class...
2907 private static final Unsafe unsafe = Unsafe.getUnsafe();
2908 // offset of Class.reflectionData instance field
2909 private static final long reflectionDataOffset
2910 = unsafe.objectFieldOffset(Class.class, "reflectionData");
2911 // offset of Class.annotationType instance field
2912 private static final long annotationTypeOffset
2913 = unsafe.objectFieldOffset(Class.class, "annotationType");
2914 // offset of Class.annotationData instance field
2915 private static final long annotationDataOffset
2916 = unsafe.objectFieldOffset(Class.class, "annotationData");
2917
2918 static <T> boolean casReflectionData(Class<?> clazz,
2919 SoftReference<ReflectionData<T>> oldData,
2920 SoftReference<ReflectionData<T>> newData) {
2921 return unsafe.compareAndSetObject(clazz, reflectionDataOffset, oldData, newData);
2922 }
2923
2924 static <T> boolean casAnnotationType(Class<?> clazz,
2925 AnnotationType oldType,
2926 AnnotationType newType) {
2927 return unsafe.compareAndSetObject(clazz, annotationTypeOffset, oldType, newType);
2928 }
2929
2930 static <T> boolean casAnnotationData(Class<?> clazz,
2931 AnnotationData oldData,
2932 AnnotationData newData) {
2933 return unsafe.compareAndSetObject(clazz, annotationDataOffset, oldData, newData);
2934 }
2935 }
2936
2937 /**
2938 * Reflection support.
2939 */
2940
2941 // Reflection data caches various derived names and reflective members. Cached
2942 // values may be invalidated when JVM TI RedefineClasses() is called
2943 private static class ReflectionData<T> {
2944 volatile Field[] declaredFields;
2945 volatile Field[] publicFields;
2946 volatile Method[] declaredMethods;
2947 volatile Method[] publicMethods;
2948 volatile Constructor<T>[] declaredConstructors;
2949 volatile Constructor<T>[] publicConstructors;
2950 // Intermediate results for getFields and getMethods
2951 volatile Field[] declaredPublicFields;
2952 volatile Method[] declaredPublicMethods;
2953 volatile Class<?>[] interfaces;
2954
2955 // Cached names
2956 String simpleName;
2957 String canonicalName;
2958 static final String NULL_SENTINEL = new String();
2959
2960 // Value of classRedefinedCount when we created this ReflectionData instance
2961 final int redefinedCount;
2962
2963 ReflectionData(int redefinedCount) {
2964 this.redefinedCount = redefinedCount;
2965 }
2966 }
2967
2968 private transient volatile SoftReference<ReflectionData<T>> reflectionData;
2969
2970 // Incremented by the VM on each call to JVM TI RedefineClasses()
2971 // that redefines this class or a superclass.
2972 private transient volatile int classRedefinedCount;
2973
2974 // Lazily create and cache ReflectionData
2975 private ReflectionData<T> reflectionData() {
2976 SoftReference<ReflectionData<T>> reflectionData = this.reflectionData;
2977 int classRedefinedCount = this.classRedefinedCount;
2978 ReflectionData<T> rd;
2979 if (reflectionData != null &&
2980 (rd = reflectionData.get()) != null &&
2981 rd.redefinedCount == classRedefinedCount) {
2982 return rd;
2983 }
2984 // else no SoftReference or cleared SoftReference or stale ReflectionData
2985 // -> create and replace new instance
2986 return newReflectionData(reflectionData, classRedefinedCount);
2987 }
2988
2989 private ReflectionData<T> newReflectionData(SoftReference<ReflectionData<T>> oldReflectionData,
2990 int classRedefinedCount) {
2991 while (true) {
2992 ReflectionData<T> rd = new ReflectionData<>(classRedefinedCount);
2993 // try to CAS it...
2994 if (Atomic.casReflectionData(this, oldReflectionData, new SoftReference<>(rd))) {
2995 return rd;
2996 }
2997 // else retry
2998 oldReflectionData = this.reflectionData;
2999 classRedefinedCount = this.classRedefinedCount;
3000 if (oldReflectionData != null &&
3001 (rd = oldReflectionData.get()) != null &&
3002 rd.redefinedCount == classRedefinedCount) {
3003 return rd;
3004 }
3005 }
3006 }
3007
3008 // Generic signature handling
3009 private native String getGenericSignature0();
3010
3011 // Generic info repository; lazily initialized
3012 private transient volatile ClassRepository genericInfo;
3013
3014 // accessor for factory
3015 private GenericsFactory getFactory() {
3016 // create scope and factory
3017 return CoreReflectionFactory.make(this, ClassScope.make(this));
3018 }
3019
3020 // accessor for generic info repository;
3021 // generic info is lazily initialized
3022 private ClassRepository getGenericInfo() {
3023 ClassRepository genericInfo = this.genericInfo;
3024 if (genericInfo == null) {
3025 String signature = getGenericSignature0();
3026 if (signature == null) {
3027 genericInfo = ClassRepository.NONE;
3028 } else {
3029 genericInfo = ClassRepository.make(signature, getFactory());
3030 }
3031 this.genericInfo = genericInfo;
3032 }
3033 return (genericInfo != ClassRepository.NONE) ? genericInfo : null;
3034 }
3035
3036 // Annotations handling
3037 native byte[] getRawAnnotations();
3038 // Since 1.8
3039 native byte[] getRawTypeAnnotations();
3040 static byte[] getExecutableTypeAnnotationBytes(Executable ex) {
3041 return getReflectionFactory().getExecutableTypeAnnotationBytes(ex);
3042 }
3043
3044 native ConstantPool getConstantPool();
3045
3046 //
3047 //
3048 // java.lang.reflect.Field handling
3049 //
3050 //
3051
3052 // Returns an array of "root" fields. These Field objects must NOT
3053 // be propagated to the outside world, but must instead be copied
3054 // via ReflectionFactory.copyField.
3055 private Field[] privateGetDeclaredFields(boolean publicOnly) {
3056 Field[] res;
3057 ReflectionData<T> rd = reflectionData();
3058 if (rd != null) {
3059 res = publicOnly ? rd.declaredPublicFields : rd.declaredFields;
3060 if (res != null) return res;
3061 }
3062 // No cached value available; request value from VM
3063 res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
3064 if (rd != null) {
3065 if (publicOnly) {
3066 rd.declaredPublicFields = res;
3067 } else {
3068 rd.declaredFields = res;
3069 }
3070 }
3071 return res;
3072 }
3073
3074 // Returns an array of "root" fields. These Field objects must NOT
3075 // be propagated to the outside world, but must instead be copied
3076 // via ReflectionFactory.copyField.
3077 private Field[] privateGetPublicFields() {
3078 Field[] res;
3079 ReflectionData<T> rd = reflectionData();
3080 if (rd != null) {
3081 res = rd.publicFields;
3082 if (res != null) return res;
3083 }
3084
3085 // Use a linked hash set to ensure order is preserved and
3086 // fields from common super interfaces are not duplicated
3087 LinkedHashSet<Field> fields = new LinkedHashSet<>();
3088
3089 // Local fields
3090 addAll(fields, privateGetDeclaredFields(true));
3091
3092 // Direct superinterfaces, recursively
3093 for (Class<?> si : getInterfaces()) {
3094 addAll(fields, si.privateGetPublicFields());
3095 }
3096
3097 // Direct superclass, recursively
3098 Class<?> sc = getSuperclass();
3099 if (sc != null) {
3100 addAll(fields, sc.privateGetPublicFields());
3101 }
3102
3103 res = fields.toArray(new Field[0]);
3104 if (rd != null) {
3105 rd.publicFields = res;
3106 }
3107 return res;
3108 }
3109
3110 private static void addAll(Collection<Field> c, Field[] o) {
3111 for (Field f : o) {
3112 c.add(f);
3113 }
3114 }
3115
3116
3117 //
3118 //
3119 // java.lang.reflect.Constructor handling
3120 //
3121 //
3122
3123 // Returns an array of "root" constructors. These Constructor
3124 // objects must NOT be propagated to the outside world, but must
3125 // instead be copied via ReflectionFactory.copyConstructor.
3126 private Constructor<T>[] privateGetDeclaredConstructors(boolean publicOnly) {
3127 Constructor<T>[] res;
3128 ReflectionData<T> rd = reflectionData();
3129 if (rd != null) {
3130 res = publicOnly ? rd.publicConstructors : rd.declaredConstructors;
3131 if (res != null) return res;
3132 }
3133 // No cached value available; request value from VM
3134 if (isInterface()) {
3135 @SuppressWarnings("unchecked")
3136 Constructor<T>[] temporaryRes = (Constructor<T>[]) new Constructor<?>[0];
3137 res = temporaryRes;
3138 } else {
3139 res = getDeclaredConstructors0(publicOnly);
3140 }
3141 if (rd != null) {
3142 if (publicOnly) {
3143 rd.publicConstructors = res;
3144 } else {
3145 rd.declaredConstructors = res;
3146 }
3147 }
3148 return res;
3149 }
3150
3151 //
3152 //
3153 // java.lang.reflect.Method handling
3154 //
3155 //
3156
3157 // Returns an array of "root" methods. These Method objects must NOT
3158 // be propagated to the outside world, but must instead be copied
3159 // via ReflectionFactory.copyMethod.
3160 private Method[] privateGetDeclaredMethods(boolean publicOnly) {
3161 Method[] res;
3162 ReflectionData<T> rd = reflectionData();
3163 if (rd != null) {
3164 res = publicOnly ? rd.declaredPublicMethods : rd.declaredMethods;
3165 if (res != null) return res;
3166 }
3167 // No cached value available; request value from VM
3168 res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
3169 if (rd != null) {
3170 if (publicOnly) {
3171 rd.declaredPublicMethods = res;
3172 } else {
3173 rd.declaredMethods = res;
3174 }
3175 }
3176 return res;
3177 }
3178
3179 // Returns an array of "root" methods. These Method objects must NOT
3180 // be propagated to the outside world, but must instead be copied
3181 // via ReflectionFactory.copyMethod.
3182 private Method[] privateGetPublicMethods() {
3183 Method[] res;
3184 ReflectionData<T> rd = reflectionData();
3185 if (rd != null) {
3186 res = rd.publicMethods;
3187 if (res != null) return res;
3188 }
3189
3190 // No cached value available; compute value recursively.
3191 // Start by fetching public declared methods...
3192 PublicMethods pms = new PublicMethods();
3193 for (Method m : privateGetDeclaredMethods(/* publicOnly */ true)) {
3194 pms.merge(m);
3195 }
3196 // ...then recur over superclass methods...
3197 Class<?> sc = getSuperclass();
3198 if (sc != null) {
3199 for (Method m : sc.privateGetPublicMethods()) {
3200 pms.merge(m);
3201 }
3202 }
3203 // ...and finally over direct superinterfaces.
3204 for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
3205 for (Method m : intf.privateGetPublicMethods()) {
3206 // static interface methods are not inherited
3207 if (!Modifier.isStatic(m.getModifiers())) {
3208 pms.merge(m);
3209 }
3210 }
3211 }
3212
3213 res = pms.toArray();
3214 if (rd != null) {
3215 rd.publicMethods = res;
3216 }
3217 return res;
3218 }
3219
3220
3221 //
3222 // Helpers for fetchers of one field, method, or constructor
3223 //
3224
3225 // This method does not copy the returned Field object!
3226 private static Field searchFields(Field[] fields, String name) {
3227 for (Field field : fields) {
3228 if (field.getName().equals(name)) {
3229 return field;
3230 }
3231 }
3232 return null;
3233 }
3234
3235 // Returns a "root" Field object. This Field object must NOT
3236 // be propagated to the outside world, but must instead be copied
3237 // via ReflectionFactory.copyField.
3238 private Field getField0(String name) {
3239 // Note: the intent is that the search algorithm this routine
3240 // uses be equivalent to the ordering imposed by
3241 // privateGetPublicFields(). It fetches only the declared
3242 // public fields for each class, however, to reduce the number
3243 // of Field objects which have to be created for the common
3244 // case where the field being requested is declared in the
3245 // class which is being queried.
3246 Field res;
3247 // Search declared public fields
3248 if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
3249 return res;
3250 }
3251 // Direct superinterfaces, recursively
3252 Class<?>[] interfaces = getInterfaces(/* cloneArray */ false);
3253 for (Class<?> c : interfaces) {
3254 if ((res = c.getField0(name)) != null) {
3255 return res;
3256 }
3257 }
3258 // Direct superclass, recursively
3259 if (!isInterface()) {
3260 Class<?> c = getSuperclass();
3261 if (c != null) {
3262 if ((res = c.getField0(name)) != null) {
3263 return res;
3264 }
3265 }
3266 }
3267 return null;
3268 }
3269
3270 // This method does not copy the returned Method object!
3271 private static Method searchMethods(Method[] methods,
3272 String name,
3273 Class<?>[] parameterTypes)
3274 {
3275 ReflectionFactory fact = getReflectionFactory();
3276 Method res = null;
3277 for (Method m : methods) {
3278 if (m.getName().equals(name)
3279 && arrayContentsEq(parameterTypes,
3280 fact.getExecutableSharedParameterTypes(m))
3281 && (res == null
3282 || (res.getReturnType() != m.getReturnType()
3283 && res.getReturnType().isAssignableFrom(m.getReturnType()))))
3284 res = m;
3285 }
3286 return res;
3287 }
3288
3289 private static final Class<?>[] EMPTY_CLASS_ARRAY = new Class<?>[0];
3290
3291 // Returns a "root" Method object. This Method object must NOT
3292 // be propagated to the outside world, but must instead be copied
3293 // via ReflectionFactory.copyMethod.
3294 private Method getMethod0(String name, Class<?>[] parameterTypes) {
3295 PublicMethods.MethodList res = getMethodsRecursive(
3296 name,
3297 parameterTypes == null ? EMPTY_CLASS_ARRAY : parameterTypes,
3298 /* includeStatic */ true);
3299 return res == null ? null : res.getMostSpecific();
3300 }
3301
3302 // Returns a list of "root" Method objects. These Method objects must NOT
3303 // be propagated to the outside world, but must instead be copied
3304 // via ReflectionFactory.copyMethod.
3305 private PublicMethods.MethodList getMethodsRecursive(String name,
3306 Class<?>[] parameterTypes,
3307 boolean includeStatic) {
3308 // 1st check declared public methods
3309 Method[] methods = privateGetDeclaredMethods(/* publicOnly */ true);
3310 PublicMethods.MethodList res = PublicMethods.MethodList
3311 .filter(methods, name, parameterTypes, includeStatic);
3312 // if there is at least one match among declared methods, we need not
3313 // search any further as such match surely overrides matching methods
3314 // declared in superclass(es) or interface(s).
3315 if (res != null) {
3316 return res;
3317 }
3318
3319 // if there was no match among declared methods,
3320 // we must consult the superclass (if any) recursively...
3321 Class<?> sc = getSuperclass();
3322 if (sc != null) {
3323 res = sc.getMethodsRecursive(name, parameterTypes, includeStatic);
3324 }
3325
3326 // ...and coalesce the superclass methods with methods obtained
3327 // from directly implemented interfaces excluding static methods...
3328 for (Class<?> intf : getInterfaces(/* cloneArray */ false)) {
3329 res = PublicMethods.MethodList.merge(
3330 res, intf.getMethodsRecursive(name, parameterTypes,
3331 /* includeStatic */ false));
3332 }
3333
3334 return res;
3335 }
3336
3337 // Returns a "root" Constructor object. This Constructor object must NOT
3338 // be propagated to the outside world, but must instead be copied
3339 // via ReflectionFactory.copyConstructor.
3340 private Constructor<T> getConstructor0(Class<?>[] parameterTypes,
3341 int which) throws NoSuchMethodException
3342 {
3343 ReflectionFactory fact = getReflectionFactory();
3344 Constructor<T>[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
3345 for (Constructor<T> constructor : constructors) {
3346 if (arrayContentsEq(parameterTypes,
3347 fact.getExecutableSharedParameterTypes(constructor))) {
3348 return constructor;
3349 }
3350 }
3351 throw new NoSuchMethodException(methodToString("<init>", parameterTypes));
3352 }
3353
3354 //
3355 // Other helpers and base implementation
3356 //
3357
3358 private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
3359 if (a1 == null) {
3360 return a2 == null || a2.length == 0;
3361 }
3362
3363 if (a2 == null) {
3364 return a1.length == 0;
3365 }
3366
3367 if (a1.length != a2.length) {
3368 return false;
3369 }
3370
3371 for (int i = 0; i < a1.length; i++) {
3372 if (a1[i] != a2[i]) {
3373 return false;
3374 }
3375 }
3376
3377 return true;
3378 }
3379
3380 private static Field[] copyFields(Field[] arg) {
3381 Field[] out = new Field[arg.length];
3382 ReflectionFactory fact = getReflectionFactory();
3383 for (int i = 0; i < arg.length; i++) {
3384 out[i] = fact.copyField(arg[i]);
3385 }
3386 return out;
3387 }
3388
3389 private static Method[] copyMethods(Method[] arg) {
3390 Method[] out = new Method[arg.length];
3391 ReflectionFactory fact = getReflectionFactory();
3392 for (int i = 0; i < arg.length; i++) {
3393 out[i] = fact.copyMethod(arg[i]);
3394 }
3395 return out;
3396 }
3397
3398 private static <U> Constructor<U>[] copyConstructors(Constructor<U>[] arg) {
3399 Constructor<U>[] out = arg.clone();
3400 ReflectionFactory fact = getReflectionFactory();
3401 for (int i = 0; i < out.length; i++) {
3402 out[i] = fact.copyConstructor(out[i]);
3403 }
3404 return out;
3405 }
3406
3407 private native Field[] getDeclaredFields0(boolean publicOnly);
3408 private native Method[] getDeclaredMethods0(boolean publicOnly);
3409 private native Constructor<T>[] getDeclaredConstructors0(boolean publicOnly);
3410 private native Class<?>[] getDeclaredClasses0();
3411
3412 /**
3413 * Helper method to get the method name from arguments.
3414 */
3415 private String methodToString(String name, Class<?>[] argTypes) {
3416 StringJoiner sj = new StringJoiner(", ", getName() + "." + name + "(", ")");
3417 if (argTypes != null) {
3418 for (int i = 0; i < argTypes.length; i++) {
3419 Class<?> c = argTypes[i];
3420 sj.add((c == null) ? "null" : c.getName());
3421 }
3422 }
3423 return sj.toString();
3424 }
3425
3426 /** use serialVersionUID from JDK 1.1 for interoperability */
3427 private static final long serialVersionUID = 3206093459760846163L;
3428
3429
3430 /**
3431 * Class Class is special cased within the Serialization Stream Protocol.
3432 *
3433 * A Class instance is written initially into an ObjectOutputStream in the
3434 * following format:
3435 * <pre>
3436 * {@code TC_CLASS} ClassDescriptor
3437 * A ClassDescriptor is a special cased serialization of
3438 * a {@code java.io.ObjectStreamClass} instance.
3439 * </pre>
3440 * A new handle is generated for the initial time the class descriptor
3441 * is written into the stream. Future references to the class descriptor
3442 * are written as references to the initial class descriptor instance.
3443 *
3444 * @see java.io.ObjectStreamClass
3445 */
3446 private static final ObjectStreamField[] serialPersistentFields =
3447 new ObjectStreamField[0];
3448
3449
3450 /**
3451 * Returns the assertion status that would be assigned to this
3452 * class if it were to be initialized at the time this method is invoked.
3453 * If this class has had its assertion status set, the most recent
3454 * setting will be returned; otherwise, if any package default assertion
3455 * status pertains to this class, the most recent setting for the most
3456 * specific pertinent package default assertion status is returned;
3457 * otherwise, if this class is not a system class (i.e., it has a
3458 * class loader) its class loader's default assertion status is returned;
3459 * otherwise, the system class default assertion status is returned.
3460 * <p>
3461 * Few programmers will have any need for this method; it is provided
3462 * for the benefit of the JRE itself. (It allows a class to determine at
3463 * the time that it is initialized whether assertions should be enabled.)
3464 * Note that this method is not guaranteed to return the actual
3465 * assertion status that was (or will be) associated with the specified
3466 * class when it was (or will be) initialized.
3467 *
3468 * @return the desired assertion status of the specified class.
3469 * @see java.lang.ClassLoader#setClassAssertionStatus
3470 * @see java.lang.ClassLoader#setPackageAssertionStatus
3471 * @see java.lang.ClassLoader#setDefaultAssertionStatus
3472 * @since 1.4
3473 */
3474 public boolean desiredAssertionStatus() {
3475 ClassLoader loader = getClassLoader0();
3476 // If the loader is null this is a system class, so ask the VM
3477 if (loader == null)
3478 return desiredAssertionStatus0(this);
3479
3480 // If the classloader has been initialized with the assertion
3481 // directives, ask it. Otherwise, ask the VM.
3482 synchronized(loader.assertionLock) {
3483 if (loader.classAssertionStatus != null) {
3484 return loader.desiredAssertionStatus(getName());
3485 }
3486 }
3487 return desiredAssertionStatus0(this);
3488 }
3489
3490 // Retrieves the desired assertion status of this class from the VM
3491 private static native boolean desiredAssertionStatus0(Class<?> clazz);
3492
3493 /**
3494 * Returns true if and only if this class was declared as an enum in the
3495 * source code.
3496 *
3497 * @return true if and only if this class was declared as an enum in the
3498 * source code
3499 * @since 1.5
3500 */
3501 public boolean isEnum() {
3502 // An enum must both directly extend java.lang.Enum and have
3503 // the ENUM bit set; classes for specialized enum constants
3504 // don't do the former.
3505 return (this.getModifiers() & ENUM) != 0 &&
3506 this.getSuperclass() == java.lang.Enum.class;
3507 }
3508
3509 // Fetches the factory for reflective objects
3510 private static ReflectionFactory getReflectionFactory() {
3511 if (reflectionFactory == null) {
3512 reflectionFactory =
3513 java.security.AccessController.doPrivileged
3514 (new ReflectionFactory.GetReflectionFactoryAction());
3515 }
3516 return reflectionFactory;
3517 }
3518 private static ReflectionFactory reflectionFactory;
3519
3520 /**
3521 * Returns the elements of this enum class or null if this
3522 * Class object does not represent an enum type.
3523 *
3524 * @return an array containing the values comprising the enum class
3525 * represented by this Class object in the order they're
3526 * declared, or null if this Class object does not
3527 * represent an enum type
3528 * @since 1.5
3529 */
3530 public T[] getEnumConstants() {
3531 T[] values = getEnumConstantsShared();
3532 return (values != null) ? values.clone() : null;
3533 }
3534
3535 /**
3536 * Returns the elements of this enum class or null if this
3537 * Class object does not represent an enum type;
3538 * identical to getEnumConstants except that the result is
3539 * uncloned, cached, and shared by all callers.
3540 */
3541 T[] getEnumConstantsShared() {
3542 T[] constants = enumConstants;
3543 if (constants == null) {
3544 if (!isEnum()) return null;
3545 try {
3546 final Method values = getMethod("values");
3547 java.security.AccessController.doPrivileged(
3548 new java.security.PrivilegedAction<>() {
3549 public Void run() {
3550 values.setAccessible(true);
3551 return null;
3552 }
3553 });
3554 @SuppressWarnings("unchecked")
3555 T[] temporaryConstants = (T[])values.invoke(null);
3556 enumConstants = constants = temporaryConstants;
3557 }
3558 // These can happen when users concoct enum-like classes
3559 // that don't comply with the enum spec.
3560 catch (InvocationTargetException | NoSuchMethodException |
3561 IllegalAccessException ex) { return null; }
3562 }
3563 return constants;
3564 }
3565 private transient volatile T[] enumConstants;
3566
3567 /**
3568 * Returns a map from simple name to enum constant. This package-private
3569 * method is used internally by Enum to implement
3570 * {@code public static <T extends Enum<T>> T valueOf(Class<T>, String)}
3571 * efficiently. Note that the map is returned by this method is
3572 * created lazily on first use. Typically it won't ever get created.
3573 */
3574 Map<String, T> enumConstantDirectory() {
3575 Map<String, T> directory = enumConstantDirectory;
3576 if (directory == null) {
3577 T[] universe = getEnumConstantsShared();
3578 if (universe == null)
3579 throw new IllegalArgumentException(
3580 getName() + " is not an enum type");
3581 directory = new HashMap<>((int)(universe.length / 0.75f) + 1);
3582 for (T constant : universe) {
3583 directory.put(((Enum<?>)constant).name(), constant);
3584 }
3585 enumConstantDirectory = directory;
3586 }
3587 return directory;
3588 }
3589 private transient volatile Map<String, T> enumConstantDirectory;
3590
3591 /**
3592 * Casts an object to the class or interface represented
3593 * by this {@code Class} object.
3594 *
3595 * @param obj the object to be cast
3596 * @return the object after casting, or null if obj is null
3597 *
3598 * @throws ClassCastException if the object is not
3599 * null and is not assignable to the type T.
3600 *
3601 * @since 1.5
3602 */
3603 @SuppressWarnings("unchecked")
3604 @HotSpotIntrinsicCandidate
3605 public T cast(Object obj) {
3606 if (obj != null && !isInstance(obj))
3607 throw new ClassCastException(cannotCastMsg(obj));
3608 return (T) obj;
3609 }
3610
3611 private String cannotCastMsg(Object obj) {
3612 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
3613 }
3614
3615 /**
3616 * Casts this {@code Class} object to represent a subclass of the class
3617 * represented by the specified class object. Checks that the cast
3618 * is valid, and throws a {@code ClassCastException} if it is not. If
3619 * this method succeeds, it always returns a reference to this class object.
3620 *
3621 * <p>This method is useful when a client needs to "narrow" the type of
3622 * a {@code Class} object to pass it to an API that restricts the
3623 * {@code Class} objects that it is willing to accept. A cast would
3624 * generate a compile-time warning, as the correctness of the cast
3625 * could not be checked at runtime (because generic types are implemented
3626 * by erasure).
3627 *
3628 * @param <U> the type to cast this class object to
3629 * @param clazz the class of the type to cast this class object to
3630 * @return this {@code Class} object, cast to represent a subclass of
3631 * the specified class object.
3632 * @throws ClassCastException if this {@code Class} object does not
3633 * represent a subclass of the specified class (here "subclass" includes
3634 * the class itself).
3635 * @since 1.5
3636 */
3637 @SuppressWarnings("unchecked")
3638 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
3639 if (clazz.isAssignableFrom(this))
3640 return (Class<? extends U>) this;
3641 else
3642 throw new ClassCastException(this.toString());
3643 }
3644
3645 /**
3646 * @throws NullPointerException {@inheritDoc}
3647 * @since 1.5
3648 */
3649 @SuppressWarnings("unchecked")
3650 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
3651 Objects.requireNonNull(annotationClass);
3652
3653 return (A) annotationData().annotations.get(annotationClass);
3654 }
3655
3656 /**
3657 * {@inheritDoc}
3658 * @throws NullPointerException {@inheritDoc}
3659 * @since 1.5
3660 */
3661 @Override
3662 public boolean isAnnotationPresent(Class<? extends Annotation> annotationClass) {
3663 return GenericDeclaration.super.isAnnotationPresent(annotationClass);
3664 }
3665
3666 /**
3667 * @throws NullPointerException {@inheritDoc}
3668 * @since 1.8
3669 */
3670 @Override
3671 public <A extends Annotation> A[] getAnnotationsByType(Class<A> annotationClass) {
3672 Objects.requireNonNull(annotationClass);
3673
3674 AnnotationData annotationData = annotationData();
3675 return AnnotationSupport.getAssociatedAnnotations(annotationData.declaredAnnotations,
3676 this,
3677 annotationClass);
3678 }
3679
3680 /**
3681 * @since 1.5
3682 */
3683 public Annotation[] getAnnotations() {
3684 return AnnotationParser.toArray(annotationData().annotations);
3685 }
3686
3687 /**
3688 * @throws NullPointerException {@inheritDoc}
3689 * @since 1.8
3690 */
3691 @Override
3692 @SuppressWarnings("unchecked")
3693 public <A extends Annotation> A getDeclaredAnnotation(Class<A> annotationClass) {
3694 Objects.requireNonNull(annotationClass);
3695
3696 return (A) annotationData().declaredAnnotations.get(annotationClass);
3697 }
3698
3699 /**
3700 * @throws NullPointerException {@inheritDoc}
3701 * @since 1.8
3702 */
3703 @Override
3704 public <A extends Annotation> A[] getDeclaredAnnotationsByType(Class<A> annotationClass) {
3705 Objects.requireNonNull(annotationClass);
3706
3707 return AnnotationSupport.getDirectlyAndIndirectlyPresent(annotationData().declaredAnnotations,
3708 annotationClass);
3709 }
3710
3711 /**
3712 * @since 1.5
3713 */
3714 public Annotation[] getDeclaredAnnotations() {
3715 return AnnotationParser.toArray(annotationData().declaredAnnotations);
3716 }
3717
3718 // annotation data that might get invalidated when JVM TI RedefineClasses() is called
3719 private static class AnnotationData {
3720 final Map<Class<? extends Annotation>, Annotation> annotations;
3721 final Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
3722
3723 // Value of classRedefinedCount when we created this AnnotationData instance
3724 final int redefinedCount;
3725
3726 AnnotationData(Map<Class<? extends Annotation>, Annotation> annotations,
3727 Map<Class<? extends Annotation>, Annotation> declaredAnnotations,
3728 int redefinedCount) {
3729 this.annotations = annotations;
3730 this.declaredAnnotations = declaredAnnotations;
3731 this.redefinedCount = redefinedCount;
3732 }
3733 }
3734
3735 // Annotations cache
3736 @SuppressWarnings("UnusedDeclaration")
3737 private transient volatile AnnotationData annotationData;
3738
3739 private AnnotationData annotationData() {
3740 while (true) { // retry loop
3741 AnnotationData annotationData = this.annotationData;
3742 int classRedefinedCount = this.classRedefinedCount;
3743 if (annotationData != null &&
3744 annotationData.redefinedCount == classRedefinedCount) {
3745 return annotationData;
3746 }
3747 // null or stale annotationData -> optimistically create new instance
3748 AnnotationData newAnnotationData = createAnnotationData(classRedefinedCount);
3749 // try to install it
3750 if (Atomic.casAnnotationData(this, annotationData, newAnnotationData)) {
3751 // successfully installed new AnnotationData
3752 return newAnnotationData;
3753 }
3754 }
3755 }
3756
3757 private AnnotationData createAnnotationData(int classRedefinedCount) {
3758 Map<Class<? extends Annotation>, Annotation> declaredAnnotations =
3759 AnnotationParser.parseAnnotations(getRawAnnotations(), getConstantPool(), this);
3760 Class<?> superClass = getSuperclass();
3761 Map<Class<? extends Annotation>, Annotation> annotations = null;
3762 if (superClass != null) {
3763 Map<Class<? extends Annotation>, Annotation> superAnnotations =
3764 superClass.annotationData().annotations;
3765 for (Map.Entry<Class<? extends Annotation>, Annotation> e : superAnnotations.entrySet()) {
3766 Class<? extends Annotation> annotationClass = e.getKey();
3767 if (AnnotationType.getInstance(annotationClass).isInherited()) {
3768 if (annotations == null) { // lazy construction
3769 annotations = new LinkedHashMap<>((Math.max(
3770 declaredAnnotations.size(),
3771 Math.min(12, declaredAnnotations.size() + superAnnotations.size())
3772 ) * 4 + 2) / 3
3773 );
3774 }
3775 annotations.put(annotationClass, e.getValue());
3776 }
3777 }
3778 }
3779 if (annotations == null) {
3780 // no inherited annotations -> share the Map with declaredAnnotations
3781 annotations = declaredAnnotations;
3782 } else {
3783 // at least one inherited annotation -> declared may override inherited
3784 annotations.putAll(declaredAnnotations);
3785 }
3786 return new AnnotationData(annotations, declaredAnnotations, classRedefinedCount);
3787 }
3788
3789 // Annotation types cache their internal (AnnotationType) form
3790
3791 @SuppressWarnings("UnusedDeclaration")
3792 private transient volatile AnnotationType annotationType;
3793
3794 boolean casAnnotationType(AnnotationType oldType, AnnotationType newType) {
3795 return Atomic.casAnnotationType(this, oldType, newType);
3796 }
3797
3798 AnnotationType getAnnotationType() {
3799 return annotationType;
3800 }
3801
3802 Map<Class<? extends Annotation>, Annotation> getDeclaredAnnotationMap() {
3803 return annotationData().declaredAnnotations;
3804 }
3805
3806 /* Backing store of user-defined values pertaining to this class.
3807 * Maintained by the ClassValue class.
3808 */
3809 transient ClassValue.ClassValueMap classValueMap;
3810
3811 /**
3812 * Returns an {@code AnnotatedType} object that represents the use of a
3813 * type to specify the superclass of the entity represented by this {@code
3814 * Class} object. (The <em>use</em> of type Foo to specify the superclass
3815 * in '... extends Foo' is distinct from the <em>declaration</em> of type
3816 * Foo.)
3817 *
3818 * <p> If this {@code Class} object represents a type whose declaration
3819 * does not explicitly indicate an annotated superclass, then the return
3820 * value is an {@code AnnotatedType} object representing an element with no
3821 * annotations.
3822 *
3823 * <p> If this {@code Class} represents either the {@code Object} class, an
3824 * interface type, an array type, a primitive type, or void, the return
3825 * value is {@code null}.
3826 *
3827 * @return an object representing the superclass
3828 * @since 1.8
3829 */
3830 public AnnotatedType getAnnotatedSuperclass() {
3831 if (this == Object.class ||
3832 isInterface() ||
3833 isArray() ||
3834 isPrimitive() ||
3835 this == Void.TYPE) {
3836 return null;
3837 }
3838
3839 return TypeAnnotationParser.buildAnnotatedSuperclass(getRawTypeAnnotations(), getConstantPool(), this);
3840 }
3841
3842 /**
3843 * Returns an array of {@code AnnotatedType} objects that represent the use
3844 * of types to specify superinterfaces of the entity represented by this
3845 * {@code Class} object. (The <em>use</em> of type Foo to specify a
3846 * superinterface in '... implements Foo' is distinct from the
3847 * <em>declaration</em> of type Foo.)
3848 *
3849 * <p> If this {@code Class} object represents a class, the return value is
3850 * an array containing objects representing the uses of interface types to
3851 * specify interfaces implemented by the class. The order of the objects in
3852 * the array corresponds to the order of the interface types used in the
3853 * 'implements' clause of the declaration of this {@code Class} object.
3854 *
3855 * <p> If this {@code Class} object represents an interface, the return
3856 * value is an array containing objects representing the uses of interface
3857 * types to specify interfaces directly extended by the interface. The
3858 * order of the objects in the array corresponds to the order of the
3859 * interface types used in the 'extends' clause of the declaration of this
3860 * {@code Class} object.
3861 *
3862 * <p> If this {@code Class} object represents a class or interface whose
3863 * declaration does not explicitly indicate any annotated superinterfaces,
3864 * the return value is an array of length 0.
3865 *
3866 * <p> If this {@code Class} object represents either the {@code Object}
3867 * class, an array type, a primitive type, or void, the return value is an
3868 * array of length 0.
3869 *
3870 * @return an array representing the superinterfaces
3871 * @since 1.8
3872 */
3873 public AnnotatedType[] getAnnotatedInterfaces() {
3874 return TypeAnnotationParser.buildAnnotatedInterfaces(getRawTypeAnnotations(), getConstantPool(), this);
3875 }
3876
3877 private native Class<?> getNestHost0();
3878
3879 /**
3880 * Returns the nest host of the <a href=#nest>nest</a> to which the class
3881 * or interface represented by this {@code Class} object belongs.
3882 * Every class and interface is a member of exactly one nest.
3883 * A class or interface that is not recorded as belonging to a nest
3884 * belongs to the nest consisting only of itself, and is the nest
3885 * host.
3886 *
3887 * <p>Each of the {@code Class} objects representing array types,
3888 * primitive types, and {@code void} returns {@code this} to indicate
3889 * that the represented entity belongs to the nest consisting only of
3890 * itself, and is the nest host.
3891 *
3892 * <p>If there is a {@linkplain LinkageError linkage error} accessing
3893 * the nest host, or if this class or interface is not enumerated as
3894 * a member of the nest by the nest host, then it is considered to belong
3895 * to its own nest and {@code this} is returned as the host.
3896 *
3897 * @apiNote A {@code class} file of version 55.0 or greater may record the
3898 * host of the nest to which it belongs by using the {@code NestHost}
3899 * attribute (JVMS 4.7.28). Alternatively, a {@code class} file of
3900 * version 55.0 or greater may act as a nest host by enumerating the nest's
3901 * other members with the
3902 * {@code NestMembers} attribute (JVMS 4.7.29).
3903 * A {@code class} file of version 54.0 or lower does not use these
3904 * attributes.
3905 *
3906 * @return the nest host of this class or interface
3907 *
3908 * @throws SecurityException
3909 * If the returned class is not the current class, and
3910 * if a security manager, <i>s</i>, is present and the caller's
3911 * class loader is not the same as or an ancestor of the class
3912 * loader for the returned class and invocation of {@link
3913 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
3914 * denies access to the package of the returned class
3915 * @since 11
3916 * @jvms 4.7.28 and 4.7.29 NestHost and NestMembers attributes
3917 * @jvms 5.4.4 Access Control
3918 */
3919 @CallerSensitive
3920 public Class<?> getNestHost() {
3921 if (isPrimitive() || isArray()) {
3922 return this;
3923 }
3924 Class<?> host;
3925 try {
3926 host = getNestHost0();
3927 } catch (LinkageError e) {
3928 // if we couldn't load our nest-host then we
3929 // act as-if we have no nest-host attribute
3930 return this;
3931 }
3932 // if null then nest membership validation failed, so we
3933 // act as-if we have no nest-host attribute
3934 if (host == null || host == this) {
3935 return this;
3936 }
3937 // returning a different class requires a security check
3938 SecurityManager sm = System.getSecurityManager();
3939 if (sm != null) {
3940 checkPackageAccess(sm,
3941 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
3942 }
3943 return host;
3944 }
3945
3946 /**
3947 * Determines if the given {@code Class} is a nestmate of the
3948 * class or interface represented by this {@code Class} object.
3949 * Two classes or interfaces are nestmates
3950 * if they have the same {@linkplain #getNestHost() nest host}.
3951 *
3952 * @param c the class to check
3953 * @return {@code true} if this class and {@code c} are members of
3954 * the same nest; and {@code false} otherwise.
3955 *
3956 * @since 11
3957 */
3958 public boolean isNestmateOf(Class<?> c) {
3959 if (this == c) {
3960 return true;
3961 }
3962 if (isPrimitive() || isArray() ||
3963 c.isPrimitive() || c.isArray()) {
3964 return false;
3965 }
3966 try {
3967 return getNestHost0() == c.getNestHost0();
3968 } catch (LinkageError e) {
3969 return false;
3970 }
3971 }
3972
3973 private native Class<?>[] getNestMembers0();
3974
3975 /**
3976 * Returns an array containing {@code Class} objects representing all the
3977 * classes and interfaces that are members of the nest to which the class
3978 * or interface represented by this {@code Class} object belongs.
3979 * The {@linkplain #getNestHost() nest host} of that nest is the zeroth
3980 * element of the array. Subsequent elements represent any classes or
3981 * interfaces that are recorded by the nest host as being members of
3982 * the nest; the order of such elements is unspecified. Duplicates are
3983 * permitted.
3984 * If the nest host of that nest does not enumerate any members, then the
3985 * array has a single element containing {@code this}.
3986 *
3987 * <p>Each of the {@code Class} objects representing array types,
3988 * primitive types, and {@code void} returns an array containing only
3989 * {@code this}.
3990 *
3991 * <p>This method validates that, for each class or interface which is
3992 * recorded as a member of the nest by the nest host, that class or
3993 * interface records itself as a member of that same nest. Any exceptions
3994 * that occur during this validation are rethrown by this method.
3995 *
3996 * @return an array of all classes and interfaces in the same nest as
3997 * this class
3998 *
3999 * @throws LinkageError
4000 * If there is any problem loading or validating a nest member or
4001 * its nest host
4002 * @throws SecurityException
4003 * If any returned class is not the current class, and
4004 * if a security manager, <i>s</i>, is present and the caller's
4005 * class loader is not the same as or an ancestor of the class
4006 * loader for that returned class and invocation of {@link
4007 * SecurityManager#checkPackageAccess s.checkPackageAccess()}
4008 * denies access to the package of that returned class
4009 *
4010 * @since 11
4011 * @see #getNestHost()
4012 */
4013 @CallerSensitive
4014 public Class<?>[] getNestMembers() {
4015 if (isPrimitive() || isArray()) {
4016 return new Class<?>[] { this };
4017 }
4018 Class<?>[] members = getNestMembers0();
4019 // Can't actually enable this due to bootstrapping issues
4020 // assert(members.length != 1 || members[0] == this); // expected invariant from VM
4021
4022 if (members.length > 1) {
4023 // If we return anything other than the current class we need
4024 // a security check
4025 SecurityManager sm = System.getSecurityManager();
4026 if (sm != null) {
4027 checkPackageAccess(sm,
4028 ClassLoader.getClassLoader(Reflection.getCallerClass()), true);
4029 }
4030 }
4031 return members;
4032 }
4033 }