2 * Copyright (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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.
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).
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.
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
28 import java.io.ByteArrayInputStream;
29 import org.apidesign.bck2brwsr.emul.AnnotationImpl;
30 import java.io.InputStream;
31 import java.lang.annotation.Annotation;
32 import java.lang.reflect.Field;
33 import java.lang.reflect.Method;
34 import java.lang.reflect.TypeVariable;
35 import org.apidesign.bck2brwsr.core.JavaScriptBody;
36 import org.apidesign.bck2brwsr.emul.MethodImpl;
39 * Instances of the class {@code Class} represent classes and
40 * interfaces in a running Java application. An enum is a kind of
41 * class and an annotation is a kind of interface. Every array also
42 * belongs to a class that is reflected as a {@code Class} object
43 * that is shared by all arrays with the same element type and number
44 * of dimensions. The primitive Java types ({@code boolean},
45 * {@code byte}, {@code char}, {@code short},
46 * {@code int}, {@code long}, {@code float}, and
47 * {@code double}), and the keyword {@code void} are also
48 * represented as {@code Class} objects.
50 * <p> {@code Class} has no public constructor. Instead {@code Class}
51 * objects are constructed automatically by the Java Virtual Machine as classes
52 * are loaded and by calls to the {@code defineClass} method in the class
55 * <p> The following example uses a {@code Class} object to print the
56 * class name of an object:
58 * <p> <blockquote><pre>
59 * void printClassName(Object obj) {
60 * System.out.println("The class of " + obj +
61 * " is " + obj.getClass().getName());
65 * <p> It is also possible to get the {@code Class} object for a named
66 * type (or for void) using a class literal. See Section 15.8.2 of
67 * <cite>The Java™ Language Specification</cite>.
71 * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
74 * @param <T> the type of the class modeled by this {@code Class}
75 * object. For example, the type of {@code String.class} is {@code
76 * Class<String>}. Use {@code Class<?>} if the class being modeled is
80 * @see java.lang.ClassLoader#defineClass(byte[], int, int)
84 class Class<T> implements java.io.Serializable,
85 java.lang.reflect.GenericDeclaration,
86 java.lang.reflect.Type,
87 java.lang.reflect.AnnotatedElement {
88 private static final int ANNOTATION= 0x00002000;
89 private static final int ENUM = 0x00004000;
90 private static final int SYNTHETIC = 0x00001000;
93 * Constructor. Only the Java Virtual Machine creates Class
100 * Converts the object to a string. The string representation is the
101 * string "class" or "interface", followed by a space, and then by the
102 * fully qualified name of the class in the format returned by
103 * {@code getName}. If this {@code Class} object represents a
104 * primitive type, this method returns the name of the primitive type. If
105 * this {@code Class} object represents void this method returns
108 * @return a string representation of this class object.
110 public String toString() {
111 return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
117 * Returns the {@code Class} object associated with the class or
118 * interface with the given string name. Invoking this method is
122 * {@code Class.forName(className, true, currentLoader)}
125 * where {@code currentLoader} denotes the defining class loader of
128 * <p> For example, the following code fragment returns the
129 * runtime {@code Class} descriptor for the class named
130 * {@code java.lang.Thread}:
133 * {@code Class t = Class.forName("java.lang.Thread")}
136 * A call to {@code forName("X")} causes the class named
137 * {@code X} to be initialized.
139 * @param className the fully qualified name of the desired class.
140 * @return the {@code Class} object for the class with the
142 * @exception LinkageError if the linkage fails
143 * @exception ExceptionInInitializerError if the initialization provoked
144 * by this method fails
145 * @exception ClassNotFoundException if the class cannot be located
147 public static Class<?> forName(String className)
148 throws ClassNotFoundException {
149 Class<?> c = loadCls(className, className.replace('.', '_'));
151 throw new ClassNotFoundException(className);
156 @JavaScriptBody(args = {"n", "c" }, body =
157 "if (vm[c]) return vm[c].$class;\n"
158 + "if (vm.loadClass) {\n"
159 + " vm.loadClass(n);\n"
160 + " if (vm[c]) return vm[c].$class;\n"
164 private static native Class<?> loadCls(String n, String c);
168 * Creates a new instance of the class represented by this {@code Class}
169 * object. The class is instantiated as if by a {@code new}
170 * expression with an empty argument list. The class is initialized if it
171 * has not already been initialized.
173 * <p>Note that this method propagates any exception thrown by the
174 * nullary constructor, including a checked exception. Use of
175 * this method effectively bypasses the compile-time exception
176 * checking that would otherwise be performed by the compiler.
178 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
179 * Constructor.newInstance} method avoids this problem by wrapping
180 * any exception thrown by the constructor in a (checked) {@link
181 * java.lang.reflect.InvocationTargetException}.
183 * @return a newly allocated instance of the class represented by this
185 * @exception IllegalAccessException if the class or its nullary
186 * constructor is not accessible.
187 * @exception InstantiationException
188 * if this {@code Class} represents an abstract class,
189 * an interface, an array class, a primitive type, or void;
190 * or if the class has no nullary constructor;
191 * or if the instantiation fails for some other reason.
192 * @exception ExceptionInInitializerError if the initialization
193 * provoked by this method fails.
194 * @exception SecurityException
195 * If a security manager, <i>s</i>, is present and any of the
196 * following conditions is met:
201 * {@link SecurityManager#checkMemberAccess
202 * s.checkMemberAccess(this, Member.PUBLIC)} denies
203 * creation of new instances of this class
205 * <li> the caller's class loader is not the same as or an
206 * ancestor of the class loader for the current class and
207 * invocation of {@link SecurityManager#checkPackageAccess
208 * s.checkPackageAccess()} denies access to the package
214 @JavaScriptBody(args = { "self", "illegal" }, body =
215 "\nvar c = self.cnstr;"
216 + "\nif (c['cons__V']) {"
217 + "\n if ((c.cons__V.access & 0x1) != 0) {"
218 + "\n var inst = c();"
219 + "\n c.cons__V.call(inst);"
222 + "\n return illegal;"
226 private static native Object newInstance0(Class<?> self, Object illegal);
228 public T newInstance()
229 throws InstantiationException, IllegalAccessException
231 Object illegal = new Object();
232 Object inst = newInstance0(this, illegal);
234 throw new InstantiationException(getName());
236 if (inst == illegal) {
237 throw new IllegalAccessException();
243 * Determines if the specified {@code Object} is assignment-compatible
244 * with the object represented by this {@code Class}. This method is
245 * the dynamic equivalent of the Java language {@code instanceof}
246 * operator. The method returns {@code true} if the specified
247 * {@code Object} argument is non-null and can be cast to the
248 * reference type represented by this {@code Class} object without
249 * raising a {@code ClassCastException.} It returns {@code false}
252 * <p> Specifically, if this {@code Class} object represents a
253 * declared class, this method returns {@code true} if the specified
254 * {@code Object} argument is an instance of the represented class (or
255 * of any of its subclasses); it returns {@code false} otherwise. If
256 * this {@code Class} object represents an array class, this method
257 * returns {@code true} if the specified {@code Object} argument
258 * can be converted to an object of the array class by an identity
259 * conversion or by a widening reference conversion; it returns
260 * {@code false} otherwise. If this {@code Class} object
261 * represents an interface, this method returns {@code true} if the
262 * class or any superclass of the specified {@code Object} argument
263 * implements this interface; it returns {@code false} otherwise. If
264 * this {@code Class} object represents a primitive type, this method
265 * returns {@code false}.
267 * @param obj the object to check
268 * @return true if {@code obj} is an instance of this class
272 public boolean isInstance(Object obj) {
273 String prop = "$instOf_" + getName().replace('.', '_');
274 return hasProperty(obj, prop);
277 @JavaScriptBody(args = { "who", "prop" }, body =
278 "if (who[prop]) return true; else return false;"
280 private static native boolean hasProperty(Object who, String prop);
284 * Determines if the class or interface represented by this
285 * {@code Class} object is either the same as, or is a superclass or
286 * superinterface of, the class or interface represented by the specified
287 * {@code Class} parameter. It returns {@code true} if so;
288 * otherwise it returns {@code false}. If this {@code Class}
289 * object represents a primitive type, this method returns
290 * {@code true} if the specified {@code Class} parameter is
291 * exactly this {@code Class} object; otherwise it returns
294 * <p> Specifically, this method tests whether the type represented by the
295 * specified {@code Class} parameter can be converted to the type
296 * represented by this {@code Class} object via an identity conversion
297 * or via a widening reference conversion. See <em>The Java Language
298 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
300 * @param cls the {@code Class} object to be checked
301 * @return the {@code boolean} value indicating whether objects of the
302 * type {@code cls} can be assigned to objects of this class
303 * @exception NullPointerException if the specified Class parameter is
307 public native boolean isAssignableFrom(Class<?> cls);
311 * Determines if the specified {@code Class} object represents an
314 * @return {@code true} if this object represents an interface;
315 * {@code false} otherwise.
317 public boolean isInterface() {
318 return (getAccess() & 0x200) != 0;
321 @JavaScriptBody(args = {}, body = "return this.access;")
322 private native int getAccess();
326 * Determines if this {@code Class} object represents an array class.
328 * @return {@code true} if this object represents an array class;
329 * {@code false} otherwise.
332 public boolean isArray() {
338 * Determines if the specified {@code Class} object represents a
341 * <p> There are nine predefined {@code Class} objects to represent
342 * the eight primitive types and void. These are created by the Java
343 * Virtual Machine, and have the same names as the primitive types that
344 * they represent, namely {@code boolean}, {@code byte},
345 * {@code char}, {@code short}, {@code int},
346 * {@code long}, {@code float}, and {@code double}.
348 * <p> These objects may only be accessed via the following public static
349 * final variables, and are the only {@code Class} objects for which
350 * this method returns {@code true}.
352 * @return true if and only if this class represents a primitive type
354 * @see java.lang.Boolean#TYPE
355 * @see java.lang.Character#TYPE
356 * @see java.lang.Byte#TYPE
357 * @see java.lang.Short#TYPE
358 * @see java.lang.Integer#TYPE
359 * @see java.lang.Long#TYPE
360 * @see java.lang.Float#TYPE
361 * @see java.lang.Double#TYPE
362 * @see java.lang.Void#TYPE
365 @JavaScriptBody(args = {}, body =
366 "if (this.primitive) return true;"
367 + "else return false;"
369 public native boolean isPrimitive();
372 * Returns true if this {@code Class} object represents an annotation
373 * type. Note that if this method returns true, {@link #isInterface()}
374 * would also return true, as all annotation types are also interfaces.
376 * @return {@code true} if this class object represents an annotation
377 * type; {@code false} otherwise
380 public boolean isAnnotation() {
381 return (getModifiers() & ANNOTATION) != 0;
385 * Returns {@code true} if this class is a synthetic class;
386 * returns {@code false} otherwise.
387 * @return {@code true} if and only if this class is a synthetic class as
388 * defined by the Java Language Specification.
391 public boolean isSynthetic() {
392 return (getModifiers() & SYNTHETIC) != 0;
396 * Returns the name of the entity (class, interface, array class,
397 * primitive type, or void) represented by this {@code Class} object,
398 * as a {@code String}.
400 * <p> If this class object represents a reference type that is not an
401 * array type then the binary name of the class is returned, as specified
403 * <cite>The Java™ Language Specification</cite>.
405 * <p> If this class object represents a primitive type or void, then the
406 * name returned is a {@code String} equal to the Java language
407 * keyword corresponding to the primitive type or void.
409 * <p> If this class object represents a class of arrays, then the internal
410 * form of the name consists of the name of the element type preceded by
411 * one or more '{@code [}' characters representing the depth of the array
412 * nesting. The encoding of element type names is as follows:
414 * <blockquote><table summary="Element types and encodings">
415 * <tr><th> Element Type <th> <th> Encoding
416 * <tr><td> boolean <td> <td align=center> Z
417 * <tr><td> byte <td> <td align=center> B
418 * <tr><td> char <td> <td align=center> C
419 * <tr><td> class or interface
420 * <td> <td align=center> L<i>classname</i>;
421 * <tr><td> double <td> <td align=center> D
422 * <tr><td> float <td> <td align=center> F
423 * <tr><td> int <td> <td align=center> I
424 * <tr><td> long <td> <td align=center> J
425 * <tr><td> short <td> <td align=center> S
426 * </table></blockquote>
428 * <p> The class or interface name <i>classname</i> is the binary name of
429 * the class specified above.
433 * String.class.getName()
434 * returns "java.lang.String"
435 * byte.class.getName()
437 * (new Object[3]).getClass().getName()
438 * returns "[Ljava.lang.Object;"
439 * (new int[3][4][5][6][7][8][9]).getClass().getName()
441 * </pre></blockquote>
443 * @return the name of the class or interface
444 * represented by this object.
446 public String getName() {
447 return jvmName().replace('/', '.');
450 @JavaScriptBody(args = {}, body = "return this.jvmName;")
451 private native String jvmName();
455 * Returns an array of {@code TypeVariable} objects that represent the
456 * type variables declared by the generic declaration represented by this
457 * {@code GenericDeclaration} object, in declaration order. Returns an
458 * array of length 0 if the underlying generic declaration declares no type
461 * @return an array of {@code TypeVariable} objects that represent
462 * the type variables declared by this generic declaration
463 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
464 * signature of this generic declaration does not conform to
465 * the format specified in
466 * <cite>The Java™ Virtual Machine Specification</cite>
469 public TypeVariable<Class<T>>[] getTypeParameters() {
470 throw new UnsupportedOperationException();
474 * Returns the {@code Class} representing the superclass of the entity
475 * (class, interface, primitive type or void) represented by this
476 * {@code Class}. If this {@code Class} represents either the
477 * {@code Object} class, an interface, a primitive type, or void, then
478 * null is returned. If this object represents an array class then the
479 * {@code Class} object representing the {@code Object} class is
482 * @return the superclass of the class represented by this object.
484 @JavaScriptBody(args = {}, body = "return this.superclass;")
485 public native Class<? super T> getSuperclass();
488 * Returns the Java language modifiers for this class or interface, encoded
489 * in an integer. The modifiers consist of the Java Virtual Machine's
490 * constants for {@code public}, {@code protected},
491 * {@code private}, {@code final}, {@code static},
492 * {@code abstract} and {@code interface}; they should be decoded
493 * using the methods of class {@code Modifier}.
495 * <p> If the underlying class is an array class, then its
496 * {@code public}, {@code private} and {@code protected}
497 * modifiers are the same as those of its component type. If this
498 * {@code Class} represents a primitive type or void, its
499 * {@code public} modifier is always {@code true}, and its
500 * {@code protected} and {@code private} modifiers are always
501 * {@code false}. If this object represents an array class, a
502 * primitive type or void, then its {@code final} modifier is always
503 * {@code true} and its interface modifier is always
504 * {@code false}. The values of its other modifiers are not determined
505 * by this specification.
507 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
508 * Specification</em>, table 4.1.
510 * @return the {@code int} representing the modifiers for this class
511 * @see java.lang.reflect.Modifier
514 public native int getModifiers();
518 * Returns the simple name of the underlying class as given in the
519 * source code. Returns an empty string if the underlying class is
522 * <p>The simple name of an array is the simple name of the
523 * component type with "[]" appended. In particular the simple
524 * name of an array whose component type is anonymous is "[]".
526 * @return the simple name of the underlying class
529 public String getSimpleName() {
531 return getComponentType().getSimpleName()+"[]";
533 String simpleName = getSimpleBinaryName();
534 if (simpleName == null) { // top level class
535 simpleName = getName();
536 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
538 // According to JLS3 "Binary Compatibility" (13.1) the binary
539 // name of non-package classes (not top level) is the binary
540 // name of the immediately enclosing class followed by a '$' followed by:
541 // (for nested and inner classes): the simple name.
542 // (for local classes): 1 or more digits followed by the simple name.
543 // (for anonymous classes): 1 or more digits.
545 // Since getSimpleBinaryName() will strip the binary name of
546 // the immediatly enclosing class, we are now looking at a
547 // string that matches the regular expression "\$[0-9]*"
548 // followed by a simple name (considering the simple of an
549 // anonymous class to be the empty string).
551 // Remove leading "\$[0-9]*" from the name
552 int length = simpleName.length();
553 if (length < 1 || simpleName.charAt(0) != '$')
554 throw new IllegalStateException("Malformed class name");
556 while (index < length && isAsciiDigit(simpleName.charAt(index)))
558 // Eventually, this is the empty string iff this is an anonymous class
559 return simpleName.substring(index);
563 * Returns the "simple binary name" of the underlying class, i.e.,
564 * the binary name without the leading enclosing class name.
565 * Returns {@code null} if the underlying class is a top level
568 private String getSimpleBinaryName() {
569 Class<?> enclosingClass = null; // XXX getEnclosingClass();
570 if (enclosingClass == null) // top level class
572 // Otherwise, strip the enclosing class' name
574 return getName().substring(enclosingClass.getName().length());
575 } catch (IndexOutOfBoundsException ex) {
576 throw new IllegalStateException("Malformed class name");
581 * Returns an array containing {@code Field} objects reflecting all
582 * the accessible public fields of the class or interface represented by
583 * this {@code Class} object. The elements in the array returned are
584 * not sorted and are not in any particular order. This method returns an
585 * array of length 0 if the class or interface has no accessible public
586 * fields, or if it represents an array class, a primitive type, or void.
588 * <p> Specifically, if this {@code Class} object represents a class,
589 * this method returns the public fields of this class and of all its
590 * superclasses. If this {@code Class} object represents an
591 * interface, this method returns the fields of this interface and of all
592 * its superinterfaces.
594 * <p> The implicit length field for array class is not reflected by this
595 * method. User code should use the methods of class {@code Array} to
598 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
600 * @return the array of {@code Field} objects representing the
602 * @exception SecurityException
603 * If a security manager, <i>s</i>, is present and any of the
604 * following conditions is met:
609 * {@link SecurityManager#checkMemberAccess
610 * s.checkMemberAccess(this, Member.PUBLIC)} denies
611 * access to the fields within this class
613 * <li> the caller's class loader is not the same as or an
614 * ancestor of the class loader for the current class and
615 * invocation of {@link SecurityManager#checkPackageAccess
616 * s.checkPackageAccess()} denies access to the package
623 public Field[] getFields() throws SecurityException {
624 throw new SecurityException();
628 * Returns an array containing {@code Method} objects reflecting all
629 * the public <em>member</em> methods of the class or interface represented
630 * by this {@code Class} object, including those declared by the class
631 * or interface and those inherited from superclasses and
632 * superinterfaces. Array classes return all the (public) member methods
633 * inherited from the {@code Object} class. The elements in the array
634 * returned are not sorted and are not in any particular order. This
635 * method returns an array of length 0 if this {@code Class} object
636 * represents a class or interface that has no public member methods, or if
637 * this {@code Class} object represents a primitive type or void.
639 * <p> The class initialization method {@code <clinit>} is not
640 * included in the returned array. If the class declares multiple public
641 * member methods with the same parameter types, they are all included in
642 * the returned array.
644 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
646 * @return the array of {@code Method} objects representing the
647 * public methods of this class
648 * @exception SecurityException
649 * If a security manager, <i>s</i>, is present and any of the
650 * following conditions is met:
655 * {@link SecurityManager#checkMemberAccess
656 * s.checkMemberAccess(this, Member.PUBLIC)} denies
657 * access to the methods within this class
659 * <li> the caller's class loader is not the same as or an
660 * ancestor of the class loader for the current class and
661 * invocation of {@link SecurityManager#checkPackageAccess
662 * s.checkPackageAccess()} denies access to the package
669 public Method[] getMethods() throws SecurityException {
670 return MethodImpl.findMethods(this, 0x01);
674 * Returns a {@code Field} object that reflects the specified public
675 * member field of the class or interface represented by this
676 * {@code Class} object. The {@code name} parameter is a
677 * {@code String} specifying the simple name of the desired field.
679 * <p> The field to be reflected is determined by the algorithm that
680 * follows. Let C be the class represented by this object:
682 * <LI> If C declares a public field with the name specified, that is the
683 * field to be reflected.</LI>
684 * <LI> If no field was found in step 1 above, this algorithm is applied
685 * recursively to each direct superinterface of C. The direct
686 * superinterfaces are searched in the order they were declared.</LI>
687 * <LI> If no field was found in steps 1 and 2 above, and C has a
688 * superclass S, then this algorithm is invoked recursively upon S.
689 * If C has no superclass, then a {@code NoSuchFieldException}
693 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
695 * @param name the field name
696 * @return the {@code Field} object of this class specified by
698 * @exception NoSuchFieldException if a field with the specified name is
700 * @exception NullPointerException if {@code name} is {@code null}
701 * @exception SecurityException
702 * If a security manager, <i>s</i>, is present and any of the
703 * following conditions is met:
708 * {@link SecurityManager#checkMemberAccess
709 * s.checkMemberAccess(this, Member.PUBLIC)} denies
710 * access to the field
712 * <li> the caller's class loader is not the same as or an
713 * ancestor of the class loader for the current class and
714 * invocation of {@link SecurityManager#checkPackageAccess
715 * s.checkPackageAccess()} denies access to the package
722 public Field getField(String name)
723 throws SecurityException {
724 throw new SecurityException();
729 * Returns a {@code Method} object that reflects the specified public
730 * member method of the class or interface represented by this
731 * {@code Class} object. The {@code name} parameter is a
732 * {@code String} specifying the simple name of the desired method. The
733 * {@code parameterTypes} parameter is an array of {@code Class}
734 * objects that identify the method's formal parameter types, in declared
735 * order. If {@code parameterTypes} is {@code null}, it is
736 * treated as if it were an empty array.
738 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
739 * {@code NoSuchMethodException} is raised. Otherwise, the method to
740 * be reflected is determined by the algorithm that follows. Let C be the
741 * class represented by this object:
743 * <LI> C is searched for any <I>matching methods</I>. If no matching
744 * method is found, the algorithm of step 1 is invoked recursively on
745 * the superclass of C.</LI>
746 * <LI> If no method was found in step 1 above, the superinterfaces of C
747 * are searched for a matching method. If any such method is found, it
751 * To find a matching method in a class C: If C declares exactly one
752 * public method with the specified name and exactly the same formal
753 * parameter types, that is the method reflected. If more than one such
754 * method is found in C, and one of these methods has a return type that is
755 * more specific than any of the others, that method is reflected;
756 * otherwise one of the methods is chosen arbitrarily.
758 * <p>Note that there may be more than one matching method in a
759 * class because while the Java language forbids a class to
760 * declare multiple methods with the same signature but different
761 * return types, the Java virtual machine does not. This
762 * increased flexibility in the virtual machine can be used to
763 * implement various language features. For example, covariant
764 * returns can be implemented with {@linkplain
765 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
766 * method and the method being overridden would have the same
767 * signature but different return types.
769 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
771 * @param name the name of the method
772 * @param parameterTypes the list of parameters
773 * @return the {@code Method} object that matches the specified
774 * {@code name} and {@code parameterTypes}
775 * @exception NoSuchMethodException if a matching method is not found
776 * or if the name is "<init>"or "<clinit>".
777 * @exception NullPointerException if {@code name} is {@code null}
778 * @exception SecurityException
779 * If a security manager, <i>s</i>, is present and any of the
780 * following conditions is met:
785 * {@link SecurityManager#checkMemberAccess
786 * s.checkMemberAccess(this, Member.PUBLIC)} denies
787 * access to the method
789 * <li> the caller's class loader is not the same as or an
790 * ancestor of the class loader for the current class and
791 * invocation of {@link SecurityManager#checkPackageAccess
792 * s.checkPackageAccess()} denies access to the package
799 public Method getMethod(String name, Class<?>... parameterTypes)
800 throws SecurityException, NoSuchMethodException {
801 Method m = MethodImpl.findMethod(this, name, parameterTypes);
803 StringBuilder sb = new StringBuilder();
804 sb.append(getName()).append('.').append(name).append('(');
806 for (int i = 0; i < parameterTypes.length; i++) {
807 sb.append(sep).append(parameterTypes[i].getName());
811 throw new NoSuchMethodException(sb.toString());
817 * Character.isDigit answers {@code true} to some non-ascii
818 * digits. This one does not.
820 private static boolean isAsciiDigit(char c) {
821 return '0' <= c && c <= '9';
825 * Returns the canonical name of the underlying class as
826 * defined by the Java Language Specification. Returns null if
827 * the underlying class does not have a canonical name (i.e., if
828 * it is a local or anonymous class or an array whose component
829 * type does not have a canonical name).
830 * @return the canonical name of the underlying class if it exists, and
831 * {@code null} otherwise.
834 public String getCanonicalName() {
836 String canonicalName = getComponentType().getCanonicalName();
837 if (canonicalName != null)
838 return canonicalName + "[]";
842 // if (isLocalOrAnonymousClass())
844 // Class<?> enclosingClass = getEnclosingClass();
845 Class<?> enclosingClass = null;
846 if (enclosingClass == null) { // top level class
849 String enclosingName = enclosingClass.getCanonicalName();
850 if (enclosingName == null)
852 return enclosingName + "." + getSimpleName();
857 * Finds a resource with a given name. The rules for searching resources
858 * associated with a given class are implemented by the defining
859 * {@linkplain ClassLoader class loader} of the class. This method
860 * delegates to this object's class loader. If this object was loaded by
861 * the bootstrap class loader, the method delegates to {@link
862 * ClassLoader#getSystemResourceAsStream}.
864 * <p> Before delegation, an absolute resource name is constructed from the
865 * given resource name using this algorithm:
869 * <li> If the {@code name} begins with a {@code '/'}
870 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
871 * portion of the {@code name} following the {@code '/'}.
873 * <li> Otherwise, the absolute name is of the following form:
876 * {@code modified_package_name/name}
879 * <p> Where the {@code modified_package_name} is the package name of this
880 * object with {@code '/'} substituted for {@code '.'}
881 * (<tt>'\u002e'</tt>).
885 * @param name name of the desired resource
886 * @return A {@link java.io.InputStream} object or {@code null} if
887 * no resource with this name is found
888 * @throws NullPointerException If {@code name} is {@code null}
891 public InputStream getResourceAsStream(String name) {
892 name = resolveName(name);
893 byte[] arr = getResourceAsStream0(name);
894 return arr == null ? null : new ByteArrayInputStream(arr);
897 @JavaScriptBody(args = "name", body =
898 "return (vm.loadBytes) ? vm.loadBytes(name) : null;"
900 private static native byte[] getResourceAsStream0(String name);
903 * Finds a resource with a given name. The rules for searching resources
904 * associated with a given class are implemented by the defining
905 * {@linkplain ClassLoader class loader} of the class. This method
906 * delegates to this object's class loader. If this object was loaded by
907 * the bootstrap class loader, the method delegates to {@link
908 * ClassLoader#getSystemResource}.
910 * <p> Before delegation, an absolute resource name is constructed from the
911 * given resource name using this algorithm:
915 * <li> If the {@code name} begins with a {@code '/'}
916 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
917 * portion of the {@code name} following the {@code '/'}.
919 * <li> Otherwise, the absolute name is of the following form:
922 * {@code modified_package_name/name}
925 * <p> Where the {@code modified_package_name} is the package name of this
926 * object with {@code '/'} substituted for {@code '.'}
927 * (<tt>'\u002e'</tt>).
931 * @param name name of the desired resource
932 * @return A {@link java.net.URL} object or {@code null} if no
933 * resource with this name is found
936 public java.net.URL getResource(String name) {
937 name = resolveName(name);
938 ClassLoader cl = null;
941 return ClassLoader.getSystemResource(name);
943 return cl.getResource(name);
948 * Add a package name prefix if the name is not absolute Remove leading "/"
949 * if name is absolute
951 private String resolveName(String name) {
955 if (!name.startsWith("/")) {
957 while (c.isArray()) {
958 c = c.getComponentType();
960 String baseName = c.getName();
961 int index = baseName.lastIndexOf('.');
963 name = baseName.substring(0, index).replace('.', '/')
967 name = name.substring(1);
973 * Returns the class loader for the class. Some implementations may use
974 * null to represent the bootstrap class loader. This method will return
975 * null in such implementations if this class was loaded by the bootstrap
978 * <p> If a security manager is present, and the caller's class loader is
979 * not null and the caller's class loader is not the same as or an ancestor of
980 * the class loader for the class whose class loader is requested, then
981 * this method calls the security manager's {@code checkPermission}
982 * method with a {@code RuntimePermission("getClassLoader")}
983 * permission to ensure it's ok to access the class loader for the class.
986 * represents a primitive type or void, null is returned.
988 * @return the class loader that loaded the class or interface
989 * represented by this object.
990 * @throws SecurityException
991 * if a security manager exists and its
992 * {@code checkPermission} method denies
993 * access to the class loader for the class.
994 * @see java.lang.ClassLoader
995 * @see SecurityManager#checkPermission
996 * @see java.lang.RuntimePermission
998 public ClassLoader getClassLoader() {
999 throw new SecurityException();
1003 * Returns the {@code Class} representing the component type of an
1004 * array. If this class does not represent an array class this method
1007 * @return the {@code Class} representing the component type of this
1008 * class if this class is an array
1009 * @see java.lang.reflect.Array
1012 public Class<?> getComponentType() {
1017 * Returns true if and only if this class was declared as an enum in the
1020 * @return true if and only if this class was declared as an enum in the
1024 public boolean isEnum() {
1025 // An enum must both directly extend java.lang.Enum and have
1026 // the ENUM bit set; classes for specialized enum constants
1027 // don't do the former.
1028 return (this.getModifiers() & ENUM) != 0 &&
1029 this.getSuperclass() == java.lang.Enum.class;
1033 * Casts an object to the class or interface represented
1034 * by this {@code Class} object.
1036 * @param obj the object to be cast
1037 * @return the object after casting, or null if obj is null
1039 * @throws ClassCastException if the object is not
1040 * null and is not assignable to the type T.
1044 public T cast(Object obj) {
1045 if (obj != null && !isInstance(obj))
1046 throw new ClassCastException(cannotCastMsg(obj));
1050 private String cannotCastMsg(Object obj) {
1051 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
1055 * Casts this {@code Class} object to represent a subclass of the class
1056 * represented by the specified class object. Checks that that the cast
1057 * is valid, and throws a {@code ClassCastException} if it is not. If
1058 * this method succeeds, it always returns a reference to this class object.
1060 * <p>This method is useful when a client needs to "narrow" the type of
1061 * a {@code Class} object to pass it to an API that restricts the
1062 * {@code Class} objects that it is willing to accept. A cast would
1063 * generate a compile-time warning, as the correctness of the cast
1064 * could not be checked at runtime (because generic types are implemented
1067 * @return this {@code Class} object, cast to represent a subclass of
1068 * the specified class object.
1069 * @throws ClassCastException if this {@code Class} object does not
1070 * represent a subclass of the specified class (here "subclass" includes
1071 * the class itself).
1074 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
1075 if (clazz.isAssignableFrom(this))
1076 return (Class<? extends U>) this;
1078 throw new ClassCastException(this.toString());
1081 @JavaScriptBody(args = { "ac" },
1084 + " return this.anno['L' + ac.jvmName + ';'];"
1085 + "} else return null;"
1087 private Object getAnnotationData(Class<?> annotationClass) {
1088 throw new UnsupportedOperationException();
1091 * @throws NullPointerException {@inheritDoc}
1094 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
1095 Object data = getAnnotationData(annotationClass);
1096 return data == null ? null : AnnotationImpl.create(annotationClass, data);
1100 * @throws NullPointerException {@inheritDoc}
1103 @JavaScriptBody(args = { "ac" },
1104 body = "if (this.anno && this.anno['L' + ac.jvmName + ';']) { return true; }"
1105 + "else return false;"
1107 public boolean isAnnotationPresent(
1108 Class<? extends Annotation> annotationClass) {
1109 if (annotationClass == null)
1110 throw new NullPointerException();
1112 return getAnnotation(annotationClass) != null;
1115 @JavaScriptBody(args = {}, body = "return this.anno;")
1116 private Object getAnnotationData() {
1117 throw new UnsupportedOperationException();
1123 public Annotation[] getAnnotations() {
1124 Object data = getAnnotationData();
1125 return data == null ? new Annotation[0] : AnnotationImpl.create(data);
1131 public Annotation[] getDeclaredAnnotations() {
1132 throw new UnsupportedOperationException();
1135 @JavaScriptBody(args = "type", body = ""
1136 + "var c = vm.java_lang_Class(true);"
1137 + "c.jvmName = type;"
1138 + "c.primitive = true;"
1141 native static Class getPrimitiveClass(String type);
1143 public boolean desiredAssertionStatus() {