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 if (className.startsWith("[")) {
150 return defineArray(className);
152 Class<?> c = loadCls(className, className.replace('.', '_'));
154 throw new ClassNotFoundException(className);
159 @JavaScriptBody(args = {"n", "c" }, body =
160 "if (vm[c]) return vm[c].$class;\n"
161 + "if (vm.loadClass) {\n"
162 + " vm.loadClass(n);\n"
163 + " if (vm[c]) return vm[c].$class;\n"
167 private static native Class<?> loadCls(String n, String c);
171 * Creates a new instance of the class represented by this {@code Class}
172 * object. The class is instantiated as if by a {@code new}
173 * expression with an empty argument list. The class is initialized if it
174 * has not already been initialized.
176 * <p>Note that this method propagates any exception thrown by the
177 * nullary constructor, including a checked exception. Use of
178 * this method effectively bypasses the compile-time exception
179 * checking that would otherwise be performed by the compiler.
181 * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
182 * Constructor.newInstance} method avoids this problem by wrapping
183 * any exception thrown by the constructor in a (checked) {@link
184 * java.lang.reflect.InvocationTargetException}.
186 * @return a newly allocated instance of the class represented by this
188 * @exception IllegalAccessException if the class or its nullary
189 * constructor is not accessible.
190 * @exception InstantiationException
191 * if this {@code Class} represents an abstract class,
192 * an interface, an array class, a primitive type, or void;
193 * or if the class has no nullary constructor;
194 * or if the instantiation fails for some other reason.
195 * @exception ExceptionInInitializerError if the initialization
196 * provoked by this method fails.
197 * @exception SecurityException
198 * If a security manager, <i>s</i>, is present and any of the
199 * following conditions is met:
204 * {@link SecurityManager#checkMemberAccess
205 * s.checkMemberAccess(this, Member.PUBLIC)} denies
206 * creation of new instances of this class
208 * <li> the caller's class loader is not the same as or an
209 * ancestor of the class loader for the current class and
210 * invocation of {@link SecurityManager#checkPackageAccess
211 * s.checkPackageAccess()} denies access to the package
217 @JavaScriptBody(args = { "self", "illegal" }, body =
218 "\nvar c = self.cnstr;"
219 + "\nif (c['cons__V']) {"
220 + "\n if ((c.cons__V.access & 0x1) != 0) {"
221 + "\n var inst = c();"
222 + "\n c.cons__V.call(inst);"
225 + "\n return illegal;"
229 private static native Object newInstance0(Class<?> self, Object illegal);
231 public T newInstance()
232 throws InstantiationException, IllegalAccessException
234 Object illegal = new Object();
235 Object inst = newInstance0(this, illegal);
237 throw new InstantiationException(getName());
239 if (inst == illegal) {
240 throw new IllegalAccessException();
246 * Determines if the specified {@code Object} is assignment-compatible
247 * with the object represented by this {@code Class}. This method is
248 * the dynamic equivalent of the Java language {@code instanceof}
249 * operator. The method returns {@code true} if the specified
250 * {@code Object} argument is non-null and can be cast to the
251 * reference type represented by this {@code Class} object without
252 * raising a {@code ClassCastException.} It returns {@code false}
255 * <p> Specifically, if this {@code Class} object represents a
256 * declared class, this method returns {@code true} if the specified
257 * {@code Object} argument is an instance of the represented class (or
258 * of any of its subclasses); it returns {@code false} otherwise. If
259 * this {@code Class} object represents an array class, this method
260 * returns {@code true} if the specified {@code Object} argument
261 * can be converted to an object of the array class by an identity
262 * conversion or by a widening reference conversion; it returns
263 * {@code false} otherwise. If this {@code Class} object
264 * represents an interface, this method returns {@code true} if the
265 * class or any superclass of the specified {@code Object} argument
266 * implements this interface; it returns {@code false} otherwise. If
267 * this {@code Class} object represents a primitive type, this method
268 * returns {@code false}.
270 * @param obj the object to check
271 * @return true if {@code obj} is an instance of this class
275 public boolean isInstance(Object obj) {
276 String prop = "$instOf_" + getName().replace('.', '_');
277 return hasProperty(obj, prop);
280 @JavaScriptBody(args = { "who", "prop" }, body =
281 "if (who[prop]) return true; else return false;"
283 private static native boolean hasProperty(Object who, String prop);
287 * Determines if the class or interface represented by this
288 * {@code Class} object is either the same as, or is a superclass or
289 * superinterface of, the class or interface represented by the specified
290 * {@code Class} parameter. It returns {@code true} if so;
291 * otherwise it returns {@code false}. If this {@code Class}
292 * object represents a primitive type, this method returns
293 * {@code true} if the specified {@code Class} parameter is
294 * exactly this {@code Class} object; otherwise it returns
297 * <p> Specifically, this method tests whether the type represented by the
298 * specified {@code Class} parameter can be converted to the type
299 * represented by this {@code Class} object via an identity conversion
300 * or via a widening reference conversion. See <em>The Java Language
301 * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
303 * @param cls the {@code Class} object to be checked
304 * @return the {@code boolean} value indicating whether objects of the
305 * type {@code cls} can be assigned to objects of this class
306 * @exception NullPointerException if the specified Class parameter is
310 public native boolean isAssignableFrom(Class<?> cls);
314 * Determines if the specified {@code Class} object represents an
317 * @return {@code true} if this object represents an interface;
318 * {@code false} otherwise.
320 public boolean isInterface() {
321 return (getAccess() & 0x200) != 0;
324 @JavaScriptBody(args = {}, body = "return this.access;")
325 private native int getAccess();
329 * Determines if this {@code Class} object represents an array class.
331 * @return {@code true} if this object represents an array class;
332 * {@code false} otherwise.
335 public boolean isArray() {
336 return hasProperty(this, "array"); // NOI18N
341 * Determines if the specified {@code Class} object represents a
344 * <p> There are nine predefined {@code Class} objects to represent
345 * the eight primitive types and void. These are created by the Java
346 * Virtual Machine, and have the same names as the primitive types that
347 * they represent, namely {@code boolean}, {@code byte},
348 * {@code char}, {@code short}, {@code int},
349 * {@code long}, {@code float}, and {@code double}.
351 * <p> These objects may only be accessed via the following public static
352 * final variables, and are the only {@code Class} objects for which
353 * this method returns {@code true}.
355 * @return true if and only if this class represents a primitive type
357 * @see java.lang.Boolean#TYPE
358 * @see java.lang.Character#TYPE
359 * @see java.lang.Byte#TYPE
360 * @see java.lang.Short#TYPE
361 * @see java.lang.Integer#TYPE
362 * @see java.lang.Long#TYPE
363 * @see java.lang.Float#TYPE
364 * @see java.lang.Double#TYPE
365 * @see java.lang.Void#TYPE
368 @JavaScriptBody(args = {}, body =
369 "if (this.primitive) return true;"
370 + "else return false;"
372 public native boolean isPrimitive();
375 * Returns true if this {@code Class} object represents an annotation
376 * type. Note that if this method returns true, {@link #isInterface()}
377 * would also return true, as all annotation types are also interfaces.
379 * @return {@code true} if this class object represents an annotation
380 * type; {@code false} otherwise
383 public boolean isAnnotation() {
384 return (getModifiers() & ANNOTATION) != 0;
388 * Returns {@code true} if this class is a synthetic class;
389 * returns {@code false} otherwise.
390 * @return {@code true} if and only if this class is a synthetic class as
391 * defined by the Java Language Specification.
394 public boolean isSynthetic() {
395 return (getModifiers() & SYNTHETIC) != 0;
399 * Returns the name of the entity (class, interface, array class,
400 * primitive type, or void) represented by this {@code Class} object,
401 * as a {@code String}.
403 * <p> If this class object represents a reference type that is not an
404 * array type then the binary name of the class is returned, as specified
406 * <cite>The Java™ Language Specification</cite>.
408 * <p> If this class object represents a primitive type or void, then the
409 * name returned is a {@code String} equal to the Java language
410 * keyword corresponding to the primitive type or void.
412 * <p> If this class object represents a class of arrays, then the internal
413 * form of the name consists of the name of the element type preceded by
414 * one or more '{@code [}' characters representing the depth of the array
415 * nesting. The encoding of element type names is as follows:
417 * <blockquote><table summary="Element types and encodings">
418 * <tr><th> Element Type <th> <th> Encoding
419 * <tr><td> boolean <td> <td align=center> Z
420 * <tr><td> byte <td> <td align=center> B
421 * <tr><td> char <td> <td align=center> C
422 * <tr><td> class or interface
423 * <td> <td align=center> L<i>classname</i>;
424 * <tr><td> double <td> <td align=center> D
425 * <tr><td> float <td> <td align=center> F
426 * <tr><td> int <td> <td align=center> I
427 * <tr><td> long <td> <td align=center> J
428 * <tr><td> short <td> <td align=center> S
429 * </table></blockquote>
431 * <p> The class or interface name <i>classname</i> is the binary name of
432 * the class specified above.
436 * String.class.getName()
437 * returns "java.lang.String"
438 * byte.class.getName()
440 * (new Object[3]).getClass().getName()
441 * returns "[Ljava.lang.Object;"
442 * (new int[3][4][5][6][7][8][9]).getClass().getName()
444 * </pre></blockquote>
446 * @return the name of the class or interface
447 * represented by this object.
449 public String getName() {
450 return jvmName().replace('/', '.');
453 @JavaScriptBody(args = {}, body = "return this.jvmName;")
454 private native String jvmName();
458 * Returns an array of {@code TypeVariable} objects that represent the
459 * type variables declared by the generic declaration represented by this
460 * {@code GenericDeclaration} object, in declaration order. Returns an
461 * array of length 0 if the underlying generic declaration declares no type
464 * @return an array of {@code TypeVariable} objects that represent
465 * the type variables declared by this generic declaration
466 * @throws java.lang.reflect.GenericSignatureFormatError if the generic
467 * signature of this generic declaration does not conform to
468 * the format specified in
469 * <cite>The Java™ Virtual Machine Specification</cite>
472 public TypeVariable<Class<T>>[] getTypeParameters() {
473 throw new UnsupportedOperationException();
477 * Returns the {@code Class} representing the superclass of the entity
478 * (class, interface, primitive type or void) represented by this
479 * {@code Class}. If this {@code Class} represents either the
480 * {@code Object} class, an interface, a primitive type, or void, then
481 * null is returned. If this object represents an array class then the
482 * {@code Class} object representing the {@code Object} class is
485 * @return the superclass of the class represented by this object.
487 @JavaScriptBody(args = {}, body = "return this.superclass;")
488 public native Class<? super T> getSuperclass();
491 * Returns the Java language modifiers for this class or interface, encoded
492 * in an integer. The modifiers consist of the Java Virtual Machine's
493 * constants for {@code public}, {@code protected},
494 * {@code private}, {@code final}, {@code static},
495 * {@code abstract} and {@code interface}; they should be decoded
496 * using the methods of class {@code Modifier}.
498 * <p> If the underlying class is an array class, then its
499 * {@code public}, {@code private} and {@code protected}
500 * modifiers are the same as those of its component type. If this
501 * {@code Class} represents a primitive type or void, its
502 * {@code public} modifier is always {@code true}, and its
503 * {@code protected} and {@code private} modifiers are always
504 * {@code false}. If this object represents an array class, a
505 * primitive type or void, then its {@code final} modifier is always
506 * {@code true} and its interface modifier is always
507 * {@code false}. The values of its other modifiers are not determined
508 * by this specification.
510 * <p> The modifier encodings are defined in <em>The Java Virtual Machine
511 * Specification</em>, table 4.1.
513 * @return the {@code int} representing the modifiers for this class
514 * @see java.lang.reflect.Modifier
517 public native int getModifiers();
521 * Returns the simple name of the underlying class as given in the
522 * source code. Returns an empty string if the underlying class is
525 * <p>The simple name of an array is the simple name of the
526 * component type with "[]" appended. In particular the simple
527 * name of an array whose component type is anonymous is "[]".
529 * @return the simple name of the underlying class
532 public String getSimpleName() {
534 return getComponentType().getSimpleName()+"[]";
536 String simpleName = getSimpleBinaryName();
537 if (simpleName == null) { // top level class
538 simpleName = getName();
539 return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
541 // According to JLS3 "Binary Compatibility" (13.1) the binary
542 // name of non-package classes (not top level) is the binary
543 // name of the immediately enclosing class followed by a '$' followed by:
544 // (for nested and inner classes): the simple name.
545 // (for local classes): 1 or more digits followed by the simple name.
546 // (for anonymous classes): 1 or more digits.
548 // Since getSimpleBinaryName() will strip the binary name of
549 // the immediatly enclosing class, we are now looking at a
550 // string that matches the regular expression "\$[0-9]*"
551 // followed by a simple name (considering the simple of an
552 // anonymous class to be the empty string).
554 // Remove leading "\$[0-9]*" from the name
555 int length = simpleName.length();
556 if (length < 1 || simpleName.charAt(0) != '$')
557 throw new IllegalStateException("Malformed class name");
559 while (index < length && isAsciiDigit(simpleName.charAt(index)))
561 // Eventually, this is the empty string iff this is an anonymous class
562 return simpleName.substring(index);
566 * Returns the "simple binary name" of the underlying class, i.e.,
567 * the binary name without the leading enclosing class name.
568 * Returns {@code null} if the underlying class is a top level
571 private String getSimpleBinaryName() {
572 Class<?> enclosingClass = null; // XXX getEnclosingClass();
573 if (enclosingClass == null) // top level class
575 // Otherwise, strip the enclosing class' name
577 return getName().substring(enclosingClass.getName().length());
578 } catch (IndexOutOfBoundsException ex) {
579 throw new IllegalStateException("Malformed class name");
584 * Returns an array containing {@code Field} objects reflecting all
585 * the accessible public fields of the class or interface represented by
586 * this {@code Class} object. The elements in the array returned are
587 * not sorted and are not in any particular order. This method returns an
588 * array of length 0 if the class or interface has no accessible public
589 * fields, or if it represents an array class, a primitive type, or void.
591 * <p> Specifically, if this {@code Class} object represents a class,
592 * this method returns the public fields of this class and of all its
593 * superclasses. If this {@code Class} object represents an
594 * interface, this method returns the fields of this interface and of all
595 * its superinterfaces.
597 * <p> The implicit length field for array class is not reflected by this
598 * method. User code should use the methods of class {@code Array} to
601 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
603 * @return the array of {@code Field} objects representing the
605 * @exception SecurityException
606 * If a security manager, <i>s</i>, is present and any of the
607 * following conditions is met:
612 * {@link SecurityManager#checkMemberAccess
613 * s.checkMemberAccess(this, Member.PUBLIC)} denies
614 * access to the fields within this class
616 * <li> the caller's class loader is not the same as or an
617 * ancestor of the class loader for the current class and
618 * invocation of {@link SecurityManager#checkPackageAccess
619 * s.checkPackageAccess()} denies access to the package
626 public Field[] getFields() throws SecurityException {
627 throw new SecurityException();
631 * Returns an array containing {@code Method} objects reflecting all
632 * the public <em>member</em> methods of the class or interface represented
633 * by this {@code Class} object, including those declared by the class
634 * or interface and those inherited from superclasses and
635 * superinterfaces. Array classes return all the (public) member methods
636 * inherited from the {@code Object} class. The elements in the array
637 * returned are not sorted and are not in any particular order. This
638 * method returns an array of length 0 if this {@code Class} object
639 * represents a class or interface that has no public member methods, or if
640 * this {@code Class} object represents a primitive type or void.
642 * <p> The class initialization method {@code <clinit>} is not
643 * included in the returned array. If the class declares multiple public
644 * member methods with the same parameter types, they are all included in
645 * the returned array.
647 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
649 * @return the array of {@code Method} objects representing the
650 * public methods of this class
651 * @exception SecurityException
652 * If a security manager, <i>s</i>, is present and any of the
653 * following conditions is met:
658 * {@link SecurityManager#checkMemberAccess
659 * s.checkMemberAccess(this, Member.PUBLIC)} denies
660 * access to the methods within this class
662 * <li> the caller's class loader is not the same as or an
663 * ancestor of the class loader for the current class and
664 * invocation of {@link SecurityManager#checkPackageAccess
665 * s.checkPackageAccess()} denies access to the package
672 public Method[] getMethods() throws SecurityException {
673 return MethodImpl.findMethods(this, 0x01);
677 * Returns a {@code Field} object that reflects the specified public
678 * member field of the class or interface represented by this
679 * {@code Class} object. The {@code name} parameter is a
680 * {@code String} specifying the simple name of the desired field.
682 * <p> The field to be reflected is determined by the algorithm that
683 * follows. Let C be the class represented by this object:
685 * <LI> If C declares a public field with the name specified, that is the
686 * field to be reflected.</LI>
687 * <LI> If no field was found in step 1 above, this algorithm is applied
688 * recursively to each direct superinterface of C. The direct
689 * superinterfaces are searched in the order they were declared.</LI>
690 * <LI> If no field was found in steps 1 and 2 above, and C has a
691 * superclass S, then this algorithm is invoked recursively upon S.
692 * If C has no superclass, then a {@code NoSuchFieldException}
696 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
698 * @param name the field name
699 * @return the {@code Field} object of this class specified by
701 * @exception NoSuchFieldException if a field with the specified name is
703 * @exception NullPointerException if {@code name} is {@code null}
704 * @exception SecurityException
705 * If a security manager, <i>s</i>, is present and any of the
706 * following conditions is met:
711 * {@link SecurityManager#checkMemberAccess
712 * s.checkMemberAccess(this, Member.PUBLIC)} denies
713 * access to the field
715 * <li> the caller's class loader is not the same as or an
716 * ancestor of the class loader for the current class and
717 * invocation of {@link SecurityManager#checkPackageAccess
718 * s.checkPackageAccess()} denies access to the package
725 public Field getField(String name)
726 throws SecurityException {
727 throw new SecurityException();
732 * Returns a {@code Method} object that reflects the specified public
733 * member method of the class or interface represented by this
734 * {@code Class} object. The {@code name} parameter is a
735 * {@code String} specifying the simple name of the desired method. The
736 * {@code parameterTypes} parameter is an array of {@code Class}
737 * objects that identify the method's formal parameter types, in declared
738 * order. If {@code parameterTypes} is {@code null}, it is
739 * treated as if it were an empty array.
741 * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
742 * {@code NoSuchMethodException} is raised. Otherwise, the method to
743 * be reflected is determined by the algorithm that follows. Let C be the
744 * class represented by this object:
746 * <LI> C is searched for any <I>matching methods</I>. If no matching
747 * method is found, the algorithm of step 1 is invoked recursively on
748 * the superclass of C.</LI>
749 * <LI> If no method was found in step 1 above, the superinterfaces of C
750 * are searched for a matching method. If any such method is found, it
754 * To find a matching method in a class C: If C declares exactly one
755 * public method with the specified name and exactly the same formal
756 * parameter types, that is the method reflected. If more than one such
757 * method is found in C, and one of these methods has a return type that is
758 * more specific than any of the others, that method is reflected;
759 * otherwise one of the methods is chosen arbitrarily.
761 * <p>Note that there may be more than one matching method in a
762 * class because while the Java language forbids a class to
763 * declare multiple methods with the same signature but different
764 * return types, the Java virtual machine does not. This
765 * increased flexibility in the virtual machine can be used to
766 * implement various language features. For example, covariant
767 * returns can be implemented with {@linkplain
768 * java.lang.reflect.Method#isBridge bridge methods}; the bridge
769 * method and the method being overridden would have the same
770 * signature but different return types.
772 * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
774 * @param name the name of the method
775 * @param parameterTypes the list of parameters
776 * @return the {@code Method} object that matches the specified
777 * {@code name} and {@code parameterTypes}
778 * @exception NoSuchMethodException if a matching method is not found
779 * or if the name is "<init>"or "<clinit>".
780 * @exception NullPointerException if {@code name} is {@code null}
781 * @exception SecurityException
782 * If a security manager, <i>s</i>, is present and any of the
783 * following conditions is met:
788 * {@link SecurityManager#checkMemberAccess
789 * s.checkMemberAccess(this, Member.PUBLIC)} denies
790 * access to the method
792 * <li> the caller's class loader is not the same as or an
793 * ancestor of the class loader for the current class and
794 * invocation of {@link SecurityManager#checkPackageAccess
795 * s.checkPackageAccess()} denies access to the package
802 public Method getMethod(String name, Class<?>... parameterTypes)
803 throws SecurityException, NoSuchMethodException {
804 Method m = MethodImpl.findMethod(this, name, parameterTypes);
806 StringBuilder sb = new StringBuilder();
807 sb.append(getName()).append('.').append(name).append('(');
809 for (int i = 0; i < parameterTypes.length; i++) {
810 sb.append(sep).append(parameterTypes[i].getName());
814 throw new NoSuchMethodException(sb.toString());
820 * Character.isDigit answers {@code true} to some non-ascii
821 * digits. This one does not.
823 private static boolean isAsciiDigit(char c) {
824 return '0' <= c && c <= '9';
828 * Returns the canonical name of the underlying class as
829 * defined by the Java Language Specification. Returns null if
830 * the underlying class does not have a canonical name (i.e., if
831 * it is a local or anonymous class or an array whose component
832 * type does not have a canonical name).
833 * @return the canonical name of the underlying class if it exists, and
834 * {@code null} otherwise.
837 public String getCanonicalName() {
839 String canonicalName = getComponentType().getCanonicalName();
840 if (canonicalName != null)
841 return canonicalName + "[]";
845 // if (isLocalOrAnonymousClass())
847 // Class<?> enclosingClass = getEnclosingClass();
848 Class<?> enclosingClass = null;
849 if (enclosingClass == null) { // top level class
852 String enclosingName = enclosingClass.getCanonicalName();
853 if (enclosingName == null)
855 return enclosingName + "." + getSimpleName();
860 * Finds a resource with a given name. The rules for searching resources
861 * associated with a given class are implemented by the defining
862 * {@linkplain ClassLoader class loader} of the class. This method
863 * delegates to this object's class loader. If this object was loaded by
864 * the bootstrap class loader, the method delegates to {@link
865 * ClassLoader#getSystemResourceAsStream}.
867 * <p> Before delegation, an absolute resource name is constructed from the
868 * given resource name using this algorithm:
872 * <li> If the {@code name} begins with a {@code '/'}
873 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
874 * portion of the {@code name} following the {@code '/'}.
876 * <li> Otherwise, the absolute name is of the following form:
879 * {@code modified_package_name/name}
882 * <p> Where the {@code modified_package_name} is the package name of this
883 * object with {@code '/'} substituted for {@code '.'}
884 * (<tt>'\u002e'</tt>).
888 * @param name name of the desired resource
889 * @return A {@link java.io.InputStream} object or {@code null} if
890 * no resource with this name is found
891 * @throws NullPointerException If {@code name} is {@code null}
894 public InputStream getResourceAsStream(String name) {
895 name = resolveName(name);
896 byte[] arr = getResourceAsStream0(name);
897 return arr == null ? null : new ByteArrayInputStream(arr);
900 @JavaScriptBody(args = "name", body =
901 "return (vm.loadBytes) ? vm.loadBytes(name) : null;"
903 private static native byte[] getResourceAsStream0(String name);
906 * Finds a resource with a given name. The rules for searching resources
907 * associated with a given class are implemented by the defining
908 * {@linkplain ClassLoader class loader} of the class. This method
909 * delegates to this object's class loader. If this object was loaded by
910 * the bootstrap class loader, the method delegates to {@link
911 * ClassLoader#getSystemResource}.
913 * <p> Before delegation, an absolute resource name is constructed from the
914 * given resource name using this algorithm:
918 * <li> If the {@code name} begins with a {@code '/'}
919 * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
920 * portion of the {@code name} following the {@code '/'}.
922 * <li> Otherwise, the absolute name is of the following form:
925 * {@code modified_package_name/name}
928 * <p> Where the {@code modified_package_name} is the package name of this
929 * object with {@code '/'} substituted for {@code '.'}
930 * (<tt>'\u002e'</tt>).
934 * @param name name of the desired resource
935 * @return A {@link java.net.URL} object or {@code null} if no
936 * resource with this name is found
939 public java.net.URL getResource(String name) {
940 name = resolveName(name);
941 ClassLoader cl = null;
944 return ClassLoader.getSystemResource(name);
946 return cl.getResource(name);
951 * Add a package name prefix if the name is not absolute Remove leading "/"
952 * if name is absolute
954 private String resolveName(String name) {
958 if (!name.startsWith("/")) {
960 while (c.isArray()) {
961 c = c.getComponentType();
963 String baseName = c.getName();
964 int index = baseName.lastIndexOf('.');
966 name = baseName.substring(0, index).replace('.', '/')
970 name = name.substring(1);
976 * Returns the class loader for the class. Some implementations may use
977 * null to represent the bootstrap class loader. This method will return
978 * null in such implementations if this class was loaded by the bootstrap
981 * <p> If a security manager is present, and the caller's class loader is
982 * not null and the caller's class loader is not the same as or an ancestor of
983 * the class loader for the class whose class loader is requested, then
984 * this method calls the security manager's {@code checkPermission}
985 * method with a {@code RuntimePermission("getClassLoader")}
986 * permission to ensure it's ok to access the class loader for the class.
989 * represents a primitive type or void, null is returned.
991 * @return the class loader that loaded the class or interface
992 * represented by this object.
993 * @throws SecurityException
994 * if a security manager exists and its
995 * {@code checkPermission} method denies
996 * access to the class loader for the class.
997 * @see java.lang.ClassLoader
998 * @see SecurityManager#checkPermission
999 * @see java.lang.RuntimePermission
1001 public ClassLoader getClassLoader() {
1002 throw new SecurityException();
1006 * Returns the {@code Class} representing the component type of an
1007 * array. If this class does not represent an array class this method
1010 * @return the {@code Class} representing the component type of this
1011 * class if this class is an array
1012 * @see java.lang.reflect.Array
1015 public Class<?> getComponentType() {
1018 return getComponentType0();
1019 } catch (ClassNotFoundException cnfe) {
1020 throw new IllegalStateException(cnfe);
1026 private Class<?> getComponentType0() throws ClassNotFoundException {
1027 String n = getName().substring(1);
1028 switch (n.charAt(0)) {
1030 n = n.substring(1, n.length() - 1);
1031 return Class.forName(n);
1033 return Integer.TYPE;
1043 return Boolean.TYPE;
1049 return Character.TYPE;
1051 return defineArray(n);
1053 throw new ClassNotFoundException("Unknown component type of " + getName());
1057 @JavaScriptBody(args = { "sig" }, body =
1058 "var c = Array[sig];\n" +
1059 "if (c) return c;\n" +
1060 "c = vm.java_lang_Class(true);\n" +
1061 "c.jvmName = sig;\n" +
1062 "c.superclass = vm.java_lang_Object(false).$class;\n" +
1063 "c.array = true;\n" +
1064 "Array[sig] = c;\n" +
1067 private static native Class<?> defineArray(String sig);
1070 * Returns true if and only if this class was declared as an enum in the
1073 * @return true if and only if this class was declared as an enum in the
1077 public boolean isEnum() {
1078 // An enum must both directly extend java.lang.Enum and have
1079 // the ENUM bit set; classes for specialized enum constants
1080 // don't do the former.
1081 return (this.getModifiers() & ENUM) != 0 &&
1082 this.getSuperclass() == java.lang.Enum.class;
1086 * Casts an object to the class or interface represented
1087 * by this {@code Class} object.
1089 * @param obj the object to be cast
1090 * @return the object after casting, or null if obj is null
1092 * @throws ClassCastException if the object is not
1093 * null and is not assignable to the type T.
1097 public T cast(Object obj) {
1098 if (obj != null && !isInstance(obj))
1099 throw new ClassCastException(cannotCastMsg(obj));
1103 private String cannotCastMsg(Object obj) {
1104 return "Cannot cast " + obj.getClass().getName() + " to " + getName();
1108 * Casts this {@code Class} object to represent a subclass of the class
1109 * represented by the specified class object. Checks that that the cast
1110 * is valid, and throws a {@code ClassCastException} if it is not. If
1111 * this method succeeds, it always returns a reference to this class object.
1113 * <p>This method is useful when a client needs to "narrow" the type of
1114 * a {@code Class} object to pass it to an API that restricts the
1115 * {@code Class} objects that it is willing to accept. A cast would
1116 * generate a compile-time warning, as the correctness of the cast
1117 * could not be checked at runtime (because generic types are implemented
1120 * @return this {@code Class} object, cast to represent a subclass of
1121 * the specified class object.
1122 * @throws ClassCastException if this {@code Class} object does not
1123 * represent a subclass of the specified class (here "subclass" includes
1124 * the class itself).
1127 public <U> Class<? extends U> asSubclass(Class<U> clazz) {
1128 if (clazz.isAssignableFrom(this))
1129 return (Class<? extends U>) this;
1131 throw new ClassCastException(this.toString());
1134 @JavaScriptBody(args = { "ac" },
1137 + " return this.anno['L' + ac.jvmName + ';'];"
1138 + "} else return null;"
1140 private Object getAnnotationData(Class<?> annotationClass) {
1141 throw new UnsupportedOperationException();
1144 * @throws NullPointerException {@inheritDoc}
1147 public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
1148 Object data = getAnnotationData(annotationClass);
1149 return data == null ? null : AnnotationImpl.create(annotationClass, data);
1153 * @throws NullPointerException {@inheritDoc}
1156 @JavaScriptBody(args = { "ac" },
1157 body = "if (this.anno && this.anno['L' + ac.jvmName + ';']) { return true; }"
1158 + "else return false;"
1160 public boolean isAnnotationPresent(
1161 Class<? extends Annotation> annotationClass) {
1162 if (annotationClass == null)
1163 throw new NullPointerException();
1165 return getAnnotation(annotationClass) != null;
1168 @JavaScriptBody(args = {}, body = "return this.anno;")
1169 private Object getAnnotationData() {
1170 throw new UnsupportedOperationException();
1176 public Annotation[] getAnnotations() {
1177 Object data = getAnnotationData();
1178 return data == null ? new Annotation[0] : AnnotationImpl.create(data);
1184 public Annotation[] getDeclaredAnnotations() {
1185 throw new UnsupportedOperationException();
1188 @JavaScriptBody(args = "type", body = ""
1189 + "var c = vm.java_lang_Class(true);"
1190 + "c.jvmName = type;"
1191 + "c.primitive = true;"
1194 native static Class getPrimitiveClass(String type);
1196 public boolean desiredAssertionStatus() {