--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/java/lang/Class.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,3121 @@
+/*
+ * Copyright 1994-2006 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package java.lang;
+
+import java.lang.reflect.Array;
+import java.lang.reflect.GenericArrayType;
+import java.lang.reflect.Member;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.GenericDeclaration;
+import java.lang.reflect.Modifier;
+import java.lang.reflect.Type;
+import java.lang.reflect.TypeVariable;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.ref.SoftReference;
+import java.io.InputStream;
+import java.io.ObjectStreamField;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.LinkedList;
+import java.util.LinkedHashSet;
+import java.util.Set;
+import java.util.Map;
+import java.util.HashMap;
+import sun.misc.Unsafe;
+import sun.reflect.ConstantPool;
+import sun.reflect.Reflection;
+import sun.reflect.ReflectionFactory;
+import sun.reflect.SignatureIterator;
+import sun.reflect.generics.factory.CoreReflectionFactory;
+import sun.reflect.generics.factory.GenericsFactory;
+import sun.reflect.generics.repository.ClassRepository;
+import sun.reflect.generics.repository.MethodRepository;
+import sun.reflect.generics.repository.ConstructorRepository;
+import sun.reflect.generics.scope.ClassScope;
+import sun.security.util.SecurityConstants;
+import java.lang.annotation.Annotation;
+import sun.reflect.annotation.*;
+
+/**
+ * Instances of the class {@code Class} represent classes and
+ * interfaces in a running Java application. An enum is a kind of
+ * class and an annotation is a kind of interface. Every array also
+ * belongs to a class that is reflected as a {@code Class} object
+ * that is shared by all arrays with the same element type and number
+ * of dimensions. The primitive Java types ({@code boolean},
+ * {@code byte}, {@code char}, {@code short},
+ * {@code int}, {@code long}, {@code float}, and
+ * {@code double}), and the keyword {@code void} are also
+ * represented as {@code Class} objects.
+ *
+ * <p> {@code Class} has no public constructor. Instead {@code Class}
+ * objects are constructed automatically by the Java Virtual Machine as classes
+ * are loaded and by calls to the {@code defineClass} method in the class
+ * loader.
+ *
+ * <p> The following example uses a {@code Class} object to print the
+ * class name of an object:
+ *
+ * <p> <blockquote><pre>
+ * void printClassName(Object obj) {
+ * System.out.println("The class of " + obj +
+ * " is " + obj.getClass().getName());
+ * }
+ * </pre></blockquote>
+ *
+ * <p> It is also possible to get the {@code Class} object for a named
+ * type (or for void) using a class literal
+ * (JLS Section <A HREF="http://java.sun.com/docs/books/jls/second_edition/html/expressions.doc.html#251530">15.8.2</A>).
+ * For example:
+ *
+ * <p> <blockquote>
+ * {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
+ * </blockquote>
+ *
+ * @param <T> the type of the class modeled by this {@code Class}
+ * object. For example, the type of {@code String.class} is {@code
+ * Class<String>}. Use {@code Class<?>} if the class being modeled is
+ * unknown.
+ *
+ * @author unascribed
+ * @see java.lang.ClassLoader#defineClass(byte[], int, int)
+ * @since JDK1.0
+ */
+public final
+ class Class<T> implements java.io.Serializable,
+ java.lang.reflect.GenericDeclaration,
+ java.lang.reflect.Type,
+ java.lang.reflect.AnnotatedElement {
+ private static final int ANNOTATION= 0x00002000;
+ private static final int ENUM = 0x00004000;
+ private static final int SYNTHETIC = 0x00001000;
+
+ private static native void registerNatives();
+ static {
+ registerNatives();
+ }
+
+ /*
+ * Constructor. Only the Java Virtual Machine creates Class
+ * objects.
+ */
+ private Class() {}
+
+
+ /**
+ * Converts the object to a string. The string representation is the
+ * string "class" or "interface", followed by a space, and then by the
+ * fully qualified name of the class in the format returned by
+ * {@code getName}. If this {@code Class} object represents a
+ * primitive type, this method returns the name of the primitive type. If
+ * this {@code Class} object represents void this method returns
+ * "void".
+ *
+ * @return a string representation of this class object.
+ */
+ public String toString() {
+ return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
+ + getName();
+ }
+
+
+ /**
+ * Returns the {@code Class} object associated with the class or
+ * interface with the given string name. Invoking this method is
+ * equivalent to:
+ *
+ * <blockquote>
+ * {@code Class.forName(className, true, currentLoader)}
+ * </blockquote>
+ *
+ * where {@code currentLoader} denotes the defining class loader of
+ * the current class.
+ *
+ * <p> For example, the following code fragment returns the
+ * runtime {@code Class} descriptor for the class named
+ * {@code java.lang.Thread}:
+ *
+ * <blockquote>
+ * {@code Class t = Class.forName("java.lang.Thread")}
+ * </blockquote>
+ * <p>
+ * A call to {@code forName("X")} causes the class named
+ * {@code X} to be initialized.
+ *
+ * @param className the fully qualified name of the desired class.
+ * @return the {@code Class} object for the class with the
+ * specified name.
+ * @exception LinkageError if the linkage fails
+ * @exception ExceptionInInitializerError if the initialization provoked
+ * by this method fails
+ * @exception ClassNotFoundException if the class cannot be located
+ */
+ public static Class<?> forName(String className)
+ throws ClassNotFoundException {
+ return forName0(className, true, ClassLoader.getCallerClassLoader());
+ }
+
+
+ /**
+ * Returns the {@code Class} object associated with the class or
+ * interface with the given string name, using the given class loader.
+ * Given the fully qualified name for a class or interface (in the same
+ * format returned by {@code getName}) this method attempts to
+ * locate, load, and link the class or interface. The specified class
+ * loader is used to load the class or interface. If the parameter
+ * {@code loader} is null, the class is loaded through the bootstrap
+ * class loader. The class is initialized only if the
+ * {@code initialize} parameter is {@code true} and if it has
+ * not been initialized earlier.
+ *
+ * <p> If {@code name} denotes a primitive type or void, an attempt
+ * will be made to locate a user-defined class in the unnamed package whose
+ * name is {@code name}. Therefore, this method cannot be used to
+ * obtain any of the {@code Class} objects representing primitive
+ * types or void.
+ *
+ * <p> If {@code name} denotes an array class, the component type of
+ * the array class is loaded but not initialized.
+ *
+ * <p> For example, in an instance method the expression:
+ *
+ * <blockquote>
+ * {@code Class.forName("Foo")}
+ * </blockquote>
+ *
+ * is equivalent to:
+ *
+ * <blockquote>
+ * {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
+ * </blockquote>
+ *
+ * Note that this method throws errors related to loading, linking or
+ * initializing as specified in Sections 12.2, 12.3 and 12.4 of <em>The
+ * Java Language Specification</em>.
+ * Note that this method does not check whether the requested class
+ * is accessible to its caller.
+ *
+ * <p> If the {@code loader} is {@code null}, and a security
+ * manager is present, and the caller's class loader is not null, then this
+ * method calls the security manager's {@code checkPermission} method
+ * with a {@code RuntimePermission("getClassLoader")} permission to
+ * ensure it's ok to access the bootstrap class loader.
+ *
+ * @param name fully qualified name of the desired class
+ * @param initialize whether the class must be initialized
+ * @param loader class loader from which the class must be loaded
+ * @return class object representing the desired class
+ *
+ * @exception LinkageError if the linkage fails
+ * @exception ExceptionInInitializerError if the initialization provoked
+ * by this method fails
+ * @exception ClassNotFoundException if the class cannot be located by
+ * the specified class loader
+ *
+ * @see java.lang.Class#forName(String)
+ * @see java.lang.ClassLoader
+ * @since 1.2
+ */
+ public static Class<?> forName(String name, boolean initialize,
+ ClassLoader loader)
+ throws ClassNotFoundException
+ {
+ if (loader == null) {
+ SecurityManager sm = System.getSecurityManager();
+ if (sm != null) {
+ ClassLoader ccl = ClassLoader.getCallerClassLoader();
+ if (ccl != null) {
+ sm.checkPermission(
+ SecurityConstants.GET_CLASSLOADER_PERMISSION);
+ }
+ }
+ }
+ return forName0(name, initialize, loader);
+ }
+
+ /** Called after security checks have been made. */
+ private static native Class forName0(String name, boolean initialize,
+ ClassLoader loader)
+ throws ClassNotFoundException;
+
+ /**
+ * Creates a new instance of the class represented by this {@code Class}
+ * object. The class is instantiated as if by a {@code new}
+ * expression with an empty argument list. The class is initialized if it
+ * has not already been initialized.
+ *
+ * <p>Note that this method propagates any exception thrown by the
+ * nullary constructor, including a checked exception. Use of
+ * this method effectively bypasses the compile-time exception
+ * checking that would otherwise be performed by the compiler.
+ * The {@link
+ * java.lang.reflect.Constructor#newInstance(java.lang.Object...)
+ * Constructor.newInstance} method avoids this problem by wrapping
+ * any exception thrown by the constructor in a (checked) {@link
+ * java.lang.reflect.InvocationTargetException}.
+ *
+ * @return a newly allocated instance of the class represented by this
+ * object.
+ * @exception IllegalAccessException if the class or its nullary
+ * constructor is not accessible.
+ * @exception InstantiationException
+ * if this {@code Class} represents an abstract class,
+ * an interface, an array class, a primitive type, or void;
+ * or if the class has no nullary constructor;
+ * or if the instantiation fails for some other reason.
+ * @exception ExceptionInInitializerError if the initialization
+ * provoked by this method fails.
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * creation of new instances of this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ */
+ public T newInstance()
+ throws InstantiationException, IllegalAccessException
+ {
+ if (System.getSecurityManager() != null) {
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ }
+ return newInstance0();
+ }
+
+ private T newInstance0()
+ throws InstantiationException, IllegalAccessException
+ {
+ // NOTE: the following code may not be strictly correct under
+ // the current Java memory model.
+
+ // Constructor lookup
+ if (cachedConstructor == null) {
+ if (this == Class.class) {
+ throw new IllegalAccessException(
+ "Can not call newInstance() on the Class for java.lang.Class"
+ );
+ }
+ try {
+ Class[] empty = {};
+ final Constructor<T> c = getConstructor0(empty, Member.DECLARED);
+ // Disable accessibility checks on the constructor
+ // since we have to do the security check here anyway
+ // (the stack depth is wrong for the Constructor's
+ // security check to work)
+ java.security.AccessController.doPrivileged
+ (new java.security.PrivilegedAction() {
+ public Object run() {
+ c.setAccessible(true);
+ return null;
+ }
+ });
+ cachedConstructor = c;
+ } catch (NoSuchMethodException e) {
+ throw new InstantiationException(getName());
+ }
+ }
+ Constructor<T> tmpConstructor = cachedConstructor;
+ // Security check (same as in java.lang.reflect.Constructor)
+ int modifiers = tmpConstructor.getModifiers();
+ if (!Reflection.quickCheckMemberAccess(this, modifiers)) {
+ Class caller = Reflection.getCallerClass(3);
+ if (newInstanceCallerCache != caller) {
+ Reflection.ensureMemberAccess(caller, this, null, modifiers);
+ newInstanceCallerCache = caller;
+ }
+ }
+ // Run constructor
+ try {
+ return tmpConstructor.newInstance((Object[])null);
+ } catch (InvocationTargetException e) {
+ Unsafe.getUnsafe().throwException(e.getTargetException());
+ // Not reached
+ return null;
+ }
+ }
+ private volatile transient Constructor<T> cachedConstructor;
+ private volatile transient Class newInstanceCallerCache;
+
+
+ /**
+ * Determines if the specified {@code Object} is assignment-compatible
+ * with the object represented by this {@code Class}. This method is
+ * the dynamic equivalent of the Java language {@code instanceof}
+ * operator. The method returns {@code true} if the specified
+ * {@code Object} argument is non-null and can be cast to the
+ * reference type represented by this {@code Class} object without
+ * raising a {@code ClassCastException.} It returns {@code false}
+ * otherwise.
+ *
+ * <p> Specifically, if this {@code Class} object represents a
+ * declared class, this method returns {@code true} if the specified
+ * {@code Object} argument is an instance of the represented class (or
+ * of any of its subclasses); it returns {@code false} otherwise. If
+ * this {@code Class} object represents an array class, this method
+ * returns {@code true} if the specified {@code Object} argument
+ * can be converted to an object of the array class by an identity
+ * conversion or by a widening reference conversion; it returns
+ * {@code false} otherwise. If this {@code Class} object
+ * represents an interface, this method returns {@code true} if the
+ * class or any superclass of the specified {@code Object} argument
+ * implements this interface; it returns {@code false} otherwise. If
+ * this {@code Class} object represents a primitive type, this method
+ * returns {@code false}.
+ *
+ * @param obj the object to check
+ * @return true if {@code obj} is an instance of this class
+ *
+ * @since JDK1.1
+ */
+ public native boolean isInstance(Object obj);
+
+
+ /**
+ * Determines if the class or interface represented by this
+ * {@code Class} object is either the same as, or is a superclass or
+ * superinterface of, the class or interface represented by the specified
+ * {@code Class} parameter. It returns {@code true} if so;
+ * otherwise it returns {@code false}. If this {@code Class}
+ * object represents a primitive type, this method returns
+ * {@code true} if the specified {@code Class} parameter is
+ * exactly this {@code Class} object; otherwise it returns
+ * {@code false}.
+ *
+ * <p> Specifically, this method tests whether the type represented by the
+ * specified {@code Class} parameter can be converted to the type
+ * represented by this {@code Class} object via an identity conversion
+ * or via a widening reference conversion. See <em>The Java Language
+ * Specification</em>, sections 5.1.1 and 5.1.4 , for details.
+ *
+ * @param cls the {@code Class} object to be checked
+ * @return the {@code boolean} value indicating whether objects of the
+ * type {@code cls} can be assigned to objects of this class
+ * @exception NullPointerException if the specified Class parameter is
+ * null.
+ * @since JDK1.1
+ */
+ public native boolean isAssignableFrom(Class<?> cls);
+
+
+ /**
+ * Determines if the specified {@code Class} object represents an
+ * interface type.
+ *
+ * @return {@code true} if this object represents an interface;
+ * {@code false} otherwise.
+ */
+ public native boolean isInterface();
+
+
+ /**
+ * Determines if this {@code Class} object represents an array class.
+ *
+ * @return {@code true} if this object represents an array class;
+ * {@code false} otherwise.
+ * @since JDK1.1
+ */
+ public native boolean isArray();
+
+
+ /**
+ * Determines if the specified {@code Class} object represents a
+ * primitive type.
+ *
+ * <p> There are nine predefined {@code Class} objects to represent
+ * the eight primitive types and void. These are created by the Java
+ * Virtual Machine, and have the same names as the primitive types that
+ * they represent, namely {@code boolean}, {@code byte},
+ * {@code char}, {@code short}, {@code int},
+ * {@code long}, {@code float}, and {@code double}.
+ *
+ * <p> These objects may only be accessed via the following public static
+ * final variables, and are the only {@code Class} objects for which
+ * this method returns {@code true}.
+ *
+ * @return true if and only if this class represents a primitive type
+ *
+ * @see java.lang.Boolean#TYPE
+ * @see java.lang.Character#TYPE
+ * @see java.lang.Byte#TYPE
+ * @see java.lang.Short#TYPE
+ * @see java.lang.Integer#TYPE
+ * @see java.lang.Long#TYPE
+ * @see java.lang.Float#TYPE
+ * @see java.lang.Double#TYPE
+ * @see java.lang.Void#TYPE
+ * @since JDK1.1
+ */
+ public native boolean isPrimitive();
+
+ /**
+ * Returns true if this {@code Class} object represents an annotation
+ * type. Note that if this method returns true, {@link #isInterface()}
+ * would also return true, as all annotation types are also interfaces.
+ *
+ * @return {@code true} if this class object represents an annotation
+ * type; {@code false} otherwise
+ * @since 1.5
+ */
+ public boolean isAnnotation() {
+ return (getModifiers() & ANNOTATION) != 0;
+ }
+
+ /**
+ * Returns {@code true} if this class is a synthetic class;
+ * returns {@code false} otherwise.
+ * @return {@code true} if and only if this class is a synthetic class as
+ * defined by the Java Language Specification.
+ * @since 1.5
+ */
+ public boolean isSynthetic() {
+ return (getModifiers() & SYNTHETIC) != 0;
+ }
+
+ /**
+ * Returns the name of the entity (class, interface, array class,
+ * primitive type, or void) represented by this {@code Class} object,
+ * as a {@code String}.
+ *
+ * <p> If this class object represents a reference type that is not an
+ * array type then the binary name of the class is returned, as specified
+ * by the Java Language Specification, Second Edition.
+ *
+ * <p> If this class object represents a primitive type or void, then the
+ * name returned is a {@code String} equal to the Java language
+ * keyword corresponding to the primitive type or void.
+ *
+ * <p> If this class object represents a class of arrays, then the internal
+ * form of the name consists of the name of the element type preceded by
+ * one or more '{@code [}' characters representing the depth of the array
+ * nesting. The encoding of element type names is as follows:
+ *
+ * <blockquote><table summary="Element types and encodings">
+ * <tr><th> Element Type <th> <th> Encoding
+ * <tr><td> boolean <td> <td align=center> Z
+ * <tr><td> byte <td> <td align=center> B
+ * <tr><td> char <td> <td align=center> C
+ * <tr><td> class or interface
+ * <td> <td align=center> L<i>classname</i>;
+ * <tr><td> double <td> <td align=center> D
+ * <tr><td> float <td> <td align=center> F
+ * <tr><td> int <td> <td align=center> I
+ * <tr><td> long <td> <td align=center> J
+ * <tr><td> short <td> <td align=center> S
+ * </table></blockquote>
+ *
+ * <p> The class or interface name <i>classname</i> is the binary name of
+ * the class specified above.
+ *
+ * <p> Examples:
+ * <blockquote><pre>
+ * String.class.getName()
+ * returns "java.lang.String"
+ * byte.class.getName()
+ * returns "byte"
+ * (new Object[3]).getClass().getName()
+ * returns "[Ljava.lang.Object;"
+ * (new int[3][4][5][6][7][8][9]).getClass().getName()
+ * returns "[[[[[[[I"
+ * </pre></blockquote>
+ *
+ * @return the name of the class or interface
+ * represented by this object.
+ */
+ public String getName() {
+ if (name == null)
+ name = getName0();
+ return name;
+ }
+
+ // cache the name to reduce the number of calls into the VM
+ private transient String name;
+ private native String getName0();
+
+ /**
+ * Returns the class loader for the class. Some implementations may use
+ * null to represent the bootstrap class loader. This method will return
+ * null in such implementations if this class was loaded by the bootstrap
+ * class loader.
+ *
+ * <p> If a security manager is present, and the caller's class loader is
+ * not null and the caller's class loader is not the same as or an ancestor of
+ * the class loader for the class whose class loader is requested, then
+ * this method calls the security manager's {@code checkPermission}
+ * method with a {@code RuntimePermission("getClassLoader")}
+ * permission to ensure it's ok to access the class loader for the class.
+ *
+ * <p>If this object
+ * represents a primitive type or void, null is returned.
+ *
+ * @return the class loader that loaded the class or interface
+ * represented by this object.
+ * @throws SecurityException
+ * if a security manager exists and its
+ * {@code checkPermission} method denies
+ * access to the class loader for the class.
+ * @see java.lang.ClassLoader
+ * @see SecurityManager#checkPermission
+ * @see java.lang.RuntimePermission
+ */
+ public ClassLoader getClassLoader() {
+ ClassLoader cl = getClassLoader0();
+ if (cl == null)
+ return null;
+ SecurityManager sm = System.getSecurityManager();
+ if (sm != null) {
+ ClassLoader ccl = ClassLoader.getCallerClassLoader();
+ if (ccl != null && ccl != cl && !cl.isAncestor(ccl)) {
+ sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION);
+ }
+ }
+ return cl;
+ }
+
+ // Package-private to allow ClassLoader access
+ native ClassLoader getClassLoader0();
+
+
+ /**
+ * Returns an array of {@code TypeVariable} objects that represent the
+ * type variables declared by the generic declaration represented by this
+ * {@code GenericDeclaration} object, in declaration order. Returns an
+ * array of length 0 if the underlying generic declaration declares no type
+ * variables.
+ *
+ * @return an array of {@code TypeVariable} objects that represent
+ * the type variables declared by this generic declaration
+ * @throws GenericSignatureFormatError if the generic
+ * signature of this generic declaration does not conform to
+ * the format specified in the Java Virtual Machine Specification,
+ * 3rd edition
+ * @since 1.5
+ */
+ public TypeVariable<Class<T>>[] getTypeParameters() {
+ if (getGenericSignature() != null)
+ return (TypeVariable<Class<T>>[])getGenericInfo().getTypeParameters();
+ else
+ return (TypeVariable<Class<T>>[])new TypeVariable[0];
+ }
+
+
+ /**
+ * Returns the {@code Class} representing the superclass of the entity
+ * (class, interface, primitive type or void) represented by this
+ * {@code Class}. If this {@code Class} represents either the
+ * {@code Object} class, an interface, a primitive type, or void, then
+ * null is returned. If this object represents an array class then the
+ * {@code Class} object representing the {@code Object} class is
+ * returned.
+ *
+ * @return the superclass of the class represented by this object.
+ */
+ public native Class<? super T> getSuperclass();
+
+
+ /**
+ * Returns the {@code Type} representing the direct superclass of
+ * the entity (class, interface, primitive type or void) represented by
+ * this {@code Class}.
+ *
+ * <p>If the superclass is a parameterized type, the {@code Type}
+ * object returned must accurately reflect the actual type
+ * parameters used in the source code. The parameterized type
+ * representing the superclass is created if it had not been
+ * created before. See the declaration of {@link
+ * java.lang.reflect.ParameterizedType ParameterizedType} for the
+ * semantics of the creation process for parameterized types. If
+ * this {@code Class} represents either the {@code Object}
+ * class, an interface, a primitive type, or void, then null is
+ * returned. If this object represents an array class then the
+ * {@code Class} object representing the {@code Object} class is
+ * returned.
+ *
+ * @throws GenericSignatureFormatError if the generic
+ * class signature does not conform to the format specified in the
+ * Java Virtual Machine Specification, 3rd edition
+ * @throws TypeNotPresentException if the generic superclass
+ * refers to a non-existent type declaration
+ * @throws MalformedParameterizedTypeException if the
+ * generic superclass refers to a parameterized type that cannot be
+ * instantiated for any reason
+ * @return the superclass of the class represented by this object
+ * @since 1.5
+ */
+ public Type getGenericSuperclass() {
+ if (getGenericSignature() != null) {
+ // Historical irregularity:
+ // Generic signature marks interfaces with superclass = Object
+ // but this API returns null for interfaces
+ if (isInterface())
+ return null;
+ return getGenericInfo().getSuperclass();
+ } else
+ return getSuperclass();
+ }
+
+ /**
+ * Gets the package for this class. The class loader of this class is used
+ * to find the package. If the class was loaded by the bootstrap class
+ * loader the set of packages loaded from CLASSPATH is searched to find the
+ * package of the class. Null is returned if no package object was created
+ * by the class loader of this class.
+ *
+ * <p> Packages have attributes for versions and specifications only if the
+ * information was defined in the manifests that accompany the classes, and
+ * if the class loader created the package instance with the attributes
+ * from the manifest.
+ *
+ * @return the package of the class, or null if no package
+ * information is available from the archive or codebase.
+ */
+ public Package getPackage() {
+ return Package.getPackage(this);
+ }
+
+
+ /**
+ * Determines the interfaces implemented by the class or interface
+ * represented by this object.
+ *
+ * <p> If this object represents a class, the return value is an array
+ * containing objects representing all interfaces implemented by the
+ * class. The order of the interface objects in the array corresponds to
+ * the order of the interface names in the {@code implements} clause
+ * of the declaration of the class represented by this object. For
+ * example, given the declaration:
+ * <blockquote>
+ * {@code class Shimmer implements FloorWax, DessertTopping { ... }}
+ * </blockquote>
+ * suppose the value of {@code s} is an instance of
+ * {@code Shimmer}; the value of the expression:
+ * <blockquote>
+ * {@code s.getClass().getInterfaces()[0]}
+ * </blockquote>
+ * is the {@code Class} object that represents interface
+ * {@code FloorWax}; and the value of:
+ * <blockquote>
+ * {@code s.getClass().getInterfaces()[1]}
+ * </blockquote>
+ * is the {@code Class} object that represents interface
+ * {@code DessertTopping}.
+ *
+ * <p> If this object represents an interface, the array contains objects
+ * representing all interfaces extended by the interface. The order of the
+ * interface objects in the array corresponds to the order of the interface
+ * names in the {@code extends} clause of the declaration of the
+ * interface represented by this object.
+ *
+ * <p> If this object represents a class or interface that implements no
+ * interfaces, the method returns an array of length 0.
+ *
+ * <p> If this object represents a primitive type or void, the method
+ * returns an array of length 0.
+ *
+ * @return an array of interfaces implemented by this class.
+ */
+ public native Class<?>[] getInterfaces();
+
+ /**
+ * Returns the {@code Type}s representing the interfaces
+ * directly implemented by the class or interface represented by
+ * this object.
+ *
+ * <p>If a superinterface is a parameterized type, the
+ * {@code Type} object returned for it must accurately reflect
+ * the actual type parameters used in the source code. The
+ * parameterized type representing each superinterface is created
+ * if it had not been created before. See the declaration of
+ * {@link java.lang.reflect.ParameterizedType ParameterizedType}
+ * for the semantics of the creation process for parameterized
+ * types.
+ *
+ * <p> If this object represents a class, the return value is an
+ * array containing objects representing all interfaces
+ * implemented by the class. The order of the interface objects in
+ * the array corresponds to the order of the interface names in
+ * the {@code implements} clause of the declaration of the class
+ * represented by this object. In the case of an array class, the
+ * interfaces {@code Cloneable} and {@code Serializable} are
+ * returned in that order.
+ *
+ * <p>If this object represents an interface, the array contains
+ * objects representing all interfaces directly extended by the
+ * interface. The order of the interface objects in the array
+ * corresponds to the order of the interface names in the
+ * {@code extends} clause of the declaration of the interface
+ * represented by this object.
+ *
+ * <p>If this object represents a class or interface that
+ * implements no interfaces, the method returns an array of length
+ * 0.
+ *
+ * <p>If this object represents a primitive type or void, the
+ * method returns an array of length 0.
+ *
+ * @throws GenericSignatureFormatError
+ * if the generic class signature does not conform to the format
+ * specified in the Java Virtual Machine Specification, 3rd edition
+ * @throws TypeNotPresentException if any of the generic
+ * superinterfaces refers to a non-existent type declaration
+ * @throws MalformedParameterizedTypeException if any of the
+ * generic superinterfaces refer to a parameterized type that cannot
+ * be instantiated for any reason
+ * @return an array of interfaces implemented by this class
+ * @since 1.5
+ */
+ public Type[] getGenericInterfaces() {
+ if (getGenericSignature() != null)
+ return getGenericInfo().getSuperInterfaces();
+ else
+ return getInterfaces();
+ }
+
+
+ /**
+ * Returns the {@code Class} representing the component type of an
+ * array. If this class does not represent an array class this method
+ * returns null.
+ *
+ * @return the {@code Class} representing the component type of this
+ * class if this class is an array
+ * @see java.lang.reflect.Array
+ * @since JDK1.1
+ */
+ public native Class<?> getComponentType();
+
+
+ /**
+ * Returns the Java language modifiers for this class or interface, encoded
+ * in an integer. The modifiers consist of the Java Virtual Machine's
+ * constants for {@code public}, {@code protected},
+ * {@code private}, {@code final}, {@code static},
+ * {@code abstract} and {@code interface}; they should be decoded
+ * using the methods of class {@code Modifier}.
+ *
+ * <p> If the underlying class is an array class, then its
+ * {@code public}, {@code private} and {@code protected}
+ * modifiers are the same as those of its component type. If this
+ * {@code Class} represents a primitive type or void, its
+ * {@code public} modifier is always {@code true}, and its
+ * {@code protected} and {@code private} modifiers are always
+ * {@code false}. If this object represents an array class, a
+ * primitive type or void, then its {@code final} modifier is always
+ * {@code true} and its interface modifier is always
+ * {@code false}. The values of its other modifiers are not determined
+ * by this specification.
+ *
+ * <p> The modifier encodings are defined in <em>The Java Virtual Machine
+ * Specification</em>, table 4.1.
+ *
+ * @return the {@code int} representing the modifiers for this class
+ * @see java.lang.reflect.Modifier
+ * @since JDK1.1
+ */
+ public native int getModifiers();
+
+
+ /**
+ * Gets the signers of this class.
+ *
+ * @return the signers of this class, or null if there are no signers. In
+ * particular, this method returns null if this object represents
+ * a primitive type or void.
+ * @since JDK1.1
+ */
+ public native Object[] getSigners();
+
+
+ /**
+ * Set the signers of this class.
+ */
+ native void setSigners(Object[] signers);
+
+
+ /**
+ * If this {@code Class} object represents a local or anonymous
+ * class within a method, returns a {@link
+ * java.lang.reflect.Method Method} object representing the
+ * immediately enclosing method of the underlying class. Returns
+ * {@code null} otherwise.
+ *
+ * In particular, this method returns {@code null} if the underlying
+ * class is a local or anonymous class immediately enclosed by a type
+ * declaration, instance initializer or static initializer.
+ *
+ * @return the immediately enclosing method of the underlying class, if
+ * that class is a local or anonymous class; otherwise {@code null}.
+ * @since 1.5
+ */
+ public Method getEnclosingMethod() {
+ EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
+
+ if (enclosingInfo == null)
+ return null;
+ else {
+ if (!enclosingInfo.isMethod())
+ return null;
+
+ MethodRepository typeInfo = MethodRepository.make(enclosingInfo.getDescriptor(),
+ getFactory());
+ Class returnType = toClass(typeInfo.getReturnType());
+ Type [] parameterTypes = typeInfo.getParameterTypes();
+ Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
+
+ // Convert Types to Classes; returned types *should*
+ // be class objects since the methodDescriptor's used
+ // don't have generics information
+ for(int i = 0; i < parameterClasses.length; i++)
+ parameterClasses[i] = toClass(parameterTypes[i]);
+
+ /*
+ * Loop over all declared methods; match method name,
+ * number of and type of parameters, *and* return
+ * type. Matching return type is also necessary
+ * because of covariant returns, etc.
+ */
+ for(Method m: enclosingInfo.getEnclosingClass().getDeclaredMethods()) {
+ if (m.getName().equals(enclosingInfo.getName()) ) {
+ Class<?>[] candidateParamClasses = m.getParameterTypes();
+ if (candidateParamClasses.length == parameterClasses.length) {
+ boolean matches = true;
+ for(int i = 0; i < candidateParamClasses.length; i++) {
+ if (!candidateParamClasses[i].equals(parameterClasses[i])) {
+ matches = false;
+ break;
+ }
+ }
+
+ if (matches) { // finally, check return type
+ if (m.getReturnType().equals(returnType) )
+ return m;
+ }
+ }
+ }
+ }
+
+ throw new InternalError("Enclosing method not found");
+ }
+ }
+
+ private native Object[] getEnclosingMethod0();
+
+ private EnclosingMethodInfo getEnclosingMethodInfo() {
+ Object[] enclosingInfo = getEnclosingMethod0();
+ if (enclosingInfo == null)
+ return null;
+ else {
+ return new EnclosingMethodInfo(enclosingInfo);
+ }
+ }
+
+ private final static class EnclosingMethodInfo {
+ private Class<?> enclosingClass;
+ private String name;
+ private String descriptor;
+
+ private EnclosingMethodInfo(Object[] enclosingInfo) {
+ if (enclosingInfo.length != 3)
+ throw new InternalError("Malformed enclosing method information");
+ try {
+ // The array is expected to have three elements:
+
+ // the immediately enclosing class
+ enclosingClass = (Class<?>) enclosingInfo[0];
+ assert(enclosingClass != null);
+
+ // the immediately enclosing method or constructor's
+ // name (can be null).
+ name = (String) enclosingInfo[1];
+
+ // the immediately enclosing method or constructor's
+ // descriptor (null iff name is).
+ descriptor = (String) enclosingInfo[2];
+ assert((name != null && descriptor != null) || name == descriptor);
+ } catch (ClassCastException cce) {
+ throw new InternalError("Invalid type in enclosing method information");
+ }
+ }
+
+ boolean isPartial() {
+ return enclosingClass == null || name == null || descriptor == null;
+ }
+
+ boolean isConstructor() { return !isPartial() && "<init>".equals(name); }
+
+ boolean isMethod() { return !isPartial() && !isConstructor() && !"<clinit>".equals(name); }
+
+ Class<?> getEnclosingClass() { return enclosingClass; }
+
+ String getName() { return name; }
+
+ String getDescriptor() { return descriptor; }
+
+ }
+
+ private static Class toClass(Type o) {
+ if (o instanceof GenericArrayType)
+ return Array.newInstance(toClass(((GenericArrayType)o).getGenericComponentType()),
+ 0)
+ .getClass();
+ return (Class)o;
+ }
+
+ /**
+ * If this {@code Class} object represents a local or anonymous
+ * class within a constructor, returns a {@link
+ * java.lang.reflect.Constructor Constructor} object representing
+ * the immediately enclosing constructor of the underlying
+ * class. Returns {@code null} otherwise. In particular, this
+ * method returns {@code null} if the underlying class is a local
+ * or anonymous class immediately enclosed by a type declaration,
+ * instance initializer or static initializer.
+ *
+ * @return the immediately enclosing constructor of the underlying class, if
+ * that class is a local or anonymous class; otherwise {@code null}.
+ * @since 1.5
+ */
+ public Constructor<?> getEnclosingConstructor() {
+ EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
+
+ if (enclosingInfo == null)
+ return null;
+ else {
+ if (!enclosingInfo.isConstructor())
+ return null;
+
+ ConstructorRepository typeInfo = ConstructorRepository.make(enclosingInfo.getDescriptor(),
+ getFactory());
+ Type [] parameterTypes = typeInfo.getParameterTypes();
+ Class<?>[] parameterClasses = new Class<?>[parameterTypes.length];
+
+ // Convert Types to Classes; returned types *should*
+ // be class objects since the methodDescriptor's used
+ // don't have generics information
+ for(int i = 0; i < parameterClasses.length; i++)
+ parameterClasses[i] = toClass(parameterTypes[i]);
+
+ /*
+ * Loop over all declared constructors; match number
+ * of and type of parameters.
+ */
+ for(Constructor c: enclosingInfo.getEnclosingClass().getDeclaredConstructors()) {
+ Class<?>[] candidateParamClasses = c.getParameterTypes();
+ if (candidateParamClasses.length == parameterClasses.length) {
+ boolean matches = true;
+ for(int i = 0; i < candidateParamClasses.length; i++) {
+ if (!candidateParamClasses[i].equals(parameterClasses[i])) {
+ matches = false;
+ break;
+ }
+ }
+
+ if (matches)
+ return c;
+ }
+ }
+
+ throw new InternalError("Enclosing constructor not found");
+ }
+ }
+
+
+ /**
+ * If the class or interface represented by this {@code Class} object
+ * is a member of another class, returns the {@code Class} object
+ * representing the class in which it was declared. This method returns
+ * null if this class or interface is not a member of any other class. If
+ * this {@code Class} object represents an array class, a primitive
+ * type, or void,then this method returns null.
+ *
+ * @return the declaring class for this class
+ * @since JDK1.1
+ */
+ public native Class<?> getDeclaringClass();
+
+
+ /**
+ * Returns the immediately enclosing class of the underlying
+ * class. If the underlying class is a top level class this
+ * method returns {@code null}.
+ * @return the immediately enclosing class of the underlying class
+ * @since 1.5
+ */
+ public Class<?> getEnclosingClass() {
+ // There are five kinds of classes (or interfaces):
+ // a) Top level classes
+ // b) Nested classes (static member classes)
+ // c) Inner classes (non-static member classes)
+ // d) Local classes (named classes declared within a method)
+ // e) Anonymous classes
+
+
+ // JVM Spec 4.8.6: A class must have an EnclosingMethod
+ // attribute if and only if it is a local class or an
+ // anonymous class.
+ EnclosingMethodInfo enclosingInfo = getEnclosingMethodInfo();
+
+ if (enclosingInfo == null) {
+ // This is a top level or a nested class or an inner class (a, b, or c)
+ return getDeclaringClass();
+ } else {
+ Class<?> enclosingClass = enclosingInfo.getEnclosingClass();
+ // This is a local class or an anonymous class (d or e)
+ if (enclosingClass == this || enclosingClass == null)
+ throw new InternalError("Malformed enclosing method information");
+ else
+ return enclosingClass;
+ }
+ }
+
+ /**
+ * Returns the simple name of the underlying class as given in the
+ * source code. Returns an empty string if the underlying class is
+ * anonymous.
+ *
+ * <p>The simple name of an array is the simple name of the
+ * component type with "[]" appended. In particular the simple
+ * name of an array whose component type is anonymous is "[]".
+ *
+ * @return the simple name of the underlying class
+ * @since 1.5
+ */
+ public String getSimpleName() {
+ if (isArray())
+ return getComponentType().getSimpleName()+"[]";
+
+ String simpleName = getSimpleBinaryName();
+ if (simpleName == null) { // top level class
+ simpleName = getName();
+ return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
+ }
+ // According to JLS3 "Binary Compatibility" (13.1) the binary
+ // name of non-package classes (not top level) is the binary
+ // name of the immediately enclosing class followed by a '$' followed by:
+ // (for nested and inner classes): the simple name.
+ // (for local classes): 1 or more digits followed by the simple name.
+ // (for anonymous classes): 1 or more digits.
+
+ // Since getSimpleBinaryName() will strip the binary name of
+ // the immediatly enclosing class, we are now looking at a
+ // string that matches the regular expression "\$[0-9]*"
+ // followed by a simple name (considering the simple of an
+ // anonymous class to be the empty string).
+
+ // Remove leading "\$[0-9]*" from the name
+ int length = simpleName.length();
+ if (length < 1 || simpleName.charAt(0) != '$')
+ throw new InternalError("Malformed class name");
+ int index = 1;
+ while (index < length && isAsciiDigit(simpleName.charAt(index)))
+ index++;
+ // Eventually, this is the empty string iff this is an anonymous class
+ return simpleName.substring(index);
+ }
+
+ /**
+ * Character.isDigit answers {@code true} to some non-ascii
+ * digits. This one does not.
+ */
+ private static boolean isAsciiDigit(char c) {
+ return '0' <= c && c <= '9';
+ }
+
+ /**
+ * Returns the canonical name of the underlying class as
+ * defined by the Java Language Specification. Returns null if
+ * the underlying class does not have a canonical name (i.e., if
+ * it is a local or anonymous class or an array whose component
+ * type does not have a canonical name).
+ * @return the canonical name of the underlying class if it exists, and
+ * {@code null} otherwise.
+ * @since 1.5
+ */
+ public String getCanonicalName() {
+ if (isArray()) {
+ String canonicalName = getComponentType().getCanonicalName();
+ if (canonicalName != null)
+ return canonicalName + "[]";
+ else
+ return null;
+ }
+ if (isLocalOrAnonymousClass())
+ return null;
+ Class<?> enclosingClass = getEnclosingClass();
+ if (enclosingClass == null) { // top level class
+ return getName();
+ } else {
+ String enclosingName = enclosingClass.getCanonicalName();
+ if (enclosingName == null)
+ return null;
+ return enclosingName + "." + getSimpleName();
+ }
+ }
+
+ /**
+ * Returns {@code true} if and only if the underlying class
+ * is an anonymous class.
+ *
+ * @return {@code true} if and only if this class is an anonymous class.
+ * @since 1.5
+ */
+ public boolean isAnonymousClass() {
+ return "".equals(getSimpleName());
+ }
+
+ /**
+ * Returns {@code true} if and only if the underlying class
+ * is a local class.
+ *
+ * @return {@code true} if and only if this class is a local class.
+ * @since 1.5
+ */
+ public boolean isLocalClass() {
+ return isLocalOrAnonymousClass() && !isAnonymousClass();
+ }
+
+ /**
+ * Returns {@code true} if and only if the underlying class
+ * is a member class.
+ *
+ * @return {@code true} if and only if this class is a member class.
+ * @since 1.5
+ */
+ public boolean isMemberClass() {
+ return getSimpleBinaryName() != null && !isLocalOrAnonymousClass();
+ }
+
+ /**
+ * Returns the "simple binary name" of the underlying class, i.e.,
+ * the binary name without the leading enclosing class name.
+ * Returns {@code null} if the underlying class is a top level
+ * class.
+ */
+ private String getSimpleBinaryName() {
+ Class<?> enclosingClass = getEnclosingClass();
+ if (enclosingClass == null) // top level class
+ return null;
+ // Otherwise, strip the enclosing class' name
+ try {
+ return getName().substring(enclosingClass.getName().length());
+ } catch (IndexOutOfBoundsException ex) {
+ throw new InternalError("Malformed class name");
+ }
+ }
+
+ /**
+ * Returns {@code true} if this is a local class or an anonymous
+ * class. Returns {@code false} otherwise.
+ */
+ private boolean isLocalOrAnonymousClass() {
+ // JVM Spec 4.8.6: A class must have an EnclosingMethod
+ // attribute if and only if it is a local class or an
+ // anonymous class.
+ return getEnclosingMethodInfo() != null;
+ }
+
+ /**
+ * Returns an array containing {@code Class} objects representing all
+ * the public classes and interfaces that are members of the class
+ * represented by this {@code Class} object. This includes public
+ * class and interface members inherited from superclasses and public class
+ * and interface members declared by the class. This method returns an
+ * array of length 0 if this {@code Class} object has no public member
+ * classes or interfaces. This method also returns an array of length 0 if
+ * this {@code Class} object represents a primitive type, an array
+ * class, or void.
+ *
+ * @return the array of {@code Class} objects representing the public
+ * members of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} method
+ * denies access to the classes within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Class<?>[] getClasses() {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+
+ // Privileged so this implementation can look at DECLARED classes,
+ // something the caller might not have privilege to do. The code here
+ // is allowed to look at DECLARED classes because (1) it does not hand
+ // out anything other than public members and (2) public member access
+ // has already been ok'd by the SecurityManager.
+
+ Class[] result = (Class[]) java.security.AccessController.doPrivileged
+ (new java.security.PrivilegedAction() {
+ public Object run() {
+ java.util.List<Class> list = new java.util.ArrayList();
+ Class currentClass = Class.this;
+ while (currentClass != null) {
+ Class[] members = currentClass.getDeclaredClasses();
+ for (int i = 0; i < members.length; i++) {
+ if (Modifier.isPublic(members[i].getModifiers())) {
+ list.add(members[i]);
+ }
+ }
+ currentClass = currentClass.getSuperclass();
+ }
+ Class[] empty = {};
+ return list.toArray(empty);
+ }
+ });
+
+ return result;
+ }
+
+
+ /**
+ * Returns an array containing {@code Field} objects reflecting all
+ * the accessible public fields of the class or interface represented by
+ * this {@code Class} object. The elements in the array returned are
+ * not sorted and are not in any particular order. This method returns an
+ * array of length 0 if the class or interface has no accessible public
+ * fields, or if it represents an array class, a primitive type, or void.
+ *
+ * <p> Specifically, if this {@code Class} object represents a class,
+ * this method returns the public fields of this class and of all its
+ * superclasses. If this {@code Class} object represents an
+ * interface, this method returns the fields of this interface and of all
+ * its superinterfaces.
+ *
+ * <p> The implicit length field for array class is not reflected by this
+ * method. User code should use the methods of class {@code Array} to
+ * manipulate arrays.
+ *
+ * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
+ *
+ * @return the array of {@code Field} objects representing the
+ * public fields
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * access to the fields within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Field[] getFields() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ return copyFields(privateGetPublicFields(null));
+ }
+
+
+ /**
+ * Returns an array containing {@code Method} objects reflecting all
+ * the public <em>member</em> methods of the class or interface represented
+ * by this {@code Class} object, including those declared by the class
+ * or interface and those inherited from superclasses and
+ * superinterfaces. Array classes return all the (public) member methods
+ * inherited from the {@code Object} class. The elements in the array
+ * returned are not sorted and are not in any particular order. This
+ * method returns an array of length 0 if this {@code Class} object
+ * represents a class or interface that has no public member methods, or if
+ * this {@code Class} object represents a primitive type or void.
+ *
+ * <p> The class initialization method {@code <clinit>} is not
+ * included in the returned array. If the class declares multiple public
+ * member methods with the same parameter types, they are all included in
+ * the returned array.
+ *
+ * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
+ *
+ * @return the array of {@code Method} objects representing the
+ * public methods of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * access to the methods within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Method[] getMethods() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ return copyMethods(privateGetPublicMethods());
+ }
+
+
+ /**
+ * Returns an array containing {@code Constructor} objects reflecting
+ * all the public constructors of the class represented by this
+ * {@code Class} object. An array of length 0 is returned if the
+ * class has no public constructors, or if the class is an array class, or
+ * if the class reflects a primitive type or void.
+ *
+ * Note that while this method returns an array of {@code
+ * Constructor<T>} objects (that is an array of constructors from
+ * this class), the return type of this method is {@code
+ * Constructor<?>[]} and <em>not</em> {@code Constructor<T>[]} as
+ * might be expected. This less informative return type is
+ * necessary since after being returned from this method, the
+ * array could be modified to hold {@code Constructor} objects for
+ * different classes, which would violate the type guarantees of
+ * {@code Constructor<T>[]}.
+ *
+ * @return the array of {@code Constructor} objects representing the
+ * public constructors of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * access to the constructors within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Constructor<?>[] getConstructors() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ return copyConstructors(privateGetDeclaredConstructors(true));
+ }
+
+
+ /**
+ * Returns a {@code Field} object that reflects the specified public
+ * member field of the class or interface represented by this
+ * {@code Class} object. The {@code name} parameter is a
+ * {@code String} specifying the simple name of the desired field.
+ *
+ * <p> The field to be reflected is determined by the algorithm that
+ * follows. Let C be the class represented by this object:
+ * <OL>
+ * <LI> If C declares a public field with the name specified, that is the
+ * field to be reflected.</LI>
+ * <LI> If no field was found in step 1 above, this algorithm is applied
+ * recursively to each direct superinterface of C. The direct
+ * superinterfaces are searched in the order they were declared.</LI>
+ * <LI> If no field was found in steps 1 and 2 above, and C has a
+ * superclass S, then this algorithm is invoked recursively upon S.
+ * If C has no superclass, then a {@code NoSuchFieldException}
+ * is thrown.</LI>
+ * </OL>
+ *
+ * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
+ *
+ * @param name the field name
+ * @return the {@code Field} object of this class specified by
+ * {@code name}
+ * @exception NoSuchFieldException if a field with the specified name is
+ * not found.
+ * @exception NullPointerException if {@code name} is {@code null}
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * access to the field
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Field getField(String name)
+ throws NoSuchFieldException, SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ Field field = getField0(name);
+ if (field == null) {
+ throw new NoSuchFieldException(name);
+ }
+ return field;
+ }
+
+
+ /**
+ * Returns a {@code Method} object that reflects the specified public
+ * member method of the class or interface represented by this
+ * {@code Class} object. The {@code name} parameter is a
+ * {@code String} specifying the simple name of the desired method. The
+ * {@code parameterTypes} parameter is an array of {@code Class}
+ * objects that identify the method's formal parameter types, in declared
+ * order. If {@code parameterTypes} is {@code null}, it is
+ * treated as if it were an empty array.
+ *
+ * <p> If the {@code name} is "{@code <init>};"or "{@code <clinit>}" a
+ * {@code NoSuchMethodException} is raised. Otherwise, the method to
+ * be reflected is determined by the algorithm that follows. Let C be the
+ * class represented by this object:
+ * <OL>
+ * <LI> C is searched for any <I>matching methods</I>. If no matching
+ * method is found, the algorithm of step 1 is invoked recursively on
+ * the superclass of C.</LI>
+ * <LI> If no method was found in step 1 above, the superinterfaces of C
+ * are searched for a matching method. If any such method is found, it
+ * is reflected.</LI>
+ * </OL>
+ *
+ * To find a matching method in a class C: If C declares exactly one
+ * public method with the specified name and exactly the same formal
+ * parameter types, that is the method reflected. If more than one such
+ * method is found in C, and one of these methods has a return type that is
+ * more specific than any of the others, that method is reflected;
+ * otherwise one of the methods is chosen arbitrarily.
+ *
+ * <p>Note that there may be more than one matching method in a
+ * class because while the Java language forbids a class to
+ * declare multiple methods with the same signature but different
+ * return types, the Java virtual machine does not. This
+ * increased flexibility in the virtual machine can be used to
+ * implement various language features. For example, covariant
+ * returns can be implemented with {@linkplain
+ * java.lang.reflect.Method#isBridge bridge methods}; the bridge
+ * method and the method being overridden would have the same
+ * signature but different return types.
+ *
+ * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.4.
+ *
+ * @param name the name of the method
+ * @param parameterTypes the list of parameters
+ * @return the {@code Method} object that matches the specified
+ * {@code name} and {@code parameterTypes}
+ * @exception NoSuchMethodException if a matching method is not found
+ * or if the name is "<init>"or "<clinit>".
+ * @exception NullPointerException if {@code name} is {@code null}
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * access to the method
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Method getMethod(String name, Class<?>... parameterTypes)
+ throws NoSuchMethodException, SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ Method method = getMethod0(name, parameterTypes);
+ if (method == null) {
+ throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
+ }
+ return method;
+ }
+
+
+ /**
+ * Returns a {@code Constructor} object that reflects the specified
+ * public constructor of the class represented by this {@code Class}
+ * object. The {@code parameterTypes} parameter is an array of
+ * {@code Class} objects that identify the constructor's formal
+ * parameter types, in declared order.
+ *
+ * If this {@code Class} object represents an inner class
+ * declared in a non-static context, the formal parameter types
+ * include the explicit enclosing instance as the first parameter.
+ *
+ * <p> The constructor to reflect is the public constructor of the class
+ * represented by this {@code Class} object whose formal parameter
+ * types match those specified by {@code parameterTypes}.
+ *
+ * @param parameterTypes the parameter array
+ * @return the {@code Constructor} object of the public constructor that
+ * matches the specified {@code parameterTypes}
+ * @exception NoSuchMethodException if a matching method is not found.
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.PUBLIC)} denies
+ * access to the constructor
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Constructor<T> getConstructor(Class<?>... parameterTypes)
+ throws NoSuchMethodException, SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.PUBLIC, ClassLoader.getCallerClassLoader());
+ return getConstructor0(parameterTypes, Member.PUBLIC);
+ }
+
+
+ /**
+ * Returns an array of {@code Class} objects reflecting all the
+ * classes and interfaces declared as members of the class represented by
+ * this {@code Class} object. This includes public, protected, default
+ * (package) access, and private classes and interfaces declared by the
+ * class, but excludes inherited classes and interfaces. This method
+ * returns an array of length 0 if the class declares no classes or
+ * interfaces as members, or if this {@code Class} object represents a
+ * primitive type, an array class, or void.
+ *
+ * @return the array of {@code Class} objects representing all the
+ * declared members of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared classes within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Class<?>[] getDeclaredClasses() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ return getDeclaredClasses0();
+ }
+
+
+ /**
+ * Returns an array of {@code Field} objects reflecting all the fields
+ * declared by the class or interface represented by this
+ * {@code Class} object. This includes public, protected, default
+ * (package) access, and private fields, but excludes inherited fields.
+ * The elements in the array returned are not sorted and are not in any
+ * particular order. This method returns an array of length 0 if the class
+ * or interface declares no fields, or if this {@code Class} object
+ * represents a primitive type, an array class, or void.
+ *
+ * <p> See <em>The Java Language Specification</em>, sections 8.2 and 8.3.
+ *
+ * @return the array of {@code Field} objects representing all the
+ * declared fields of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared fields within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Field[] getDeclaredFields() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ return copyFields(privateGetDeclaredFields(false));
+ }
+
+
+ /**
+ * Returns an array of {@code Method} objects reflecting all the
+ * methods declared by the class or interface represented by this
+ * {@code Class} object. This includes public, protected, default
+ * (package) access, and private methods, but excludes inherited methods.
+ * The elements in the array returned are not sorted and are not in any
+ * particular order. This method returns an array of length 0 if the class
+ * or interface declares no methods, or if this {@code Class} object
+ * represents a primitive type, an array class, or void. The class
+ * initialization method {@code <clinit>} is not included in the
+ * returned array. If the class declares multiple public member methods
+ * with the same parameter types, they are all included in the returned
+ * array.
+ *
+ * <p> See <em>The Java Language Specification</em>, section 8.2.
+ *
+ * @return the array of {@code Method} objects representing all the
+ * declared methods of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared methods within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Method[] getDeclaredMethods() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ return copyMethods(privateGetDeclaredMethods(false));
+ }
+
+
+ /**
+ * Returns an array of {@code Constructor} objects reflecting all the
+ * constructors declared by the class represented by this
+ * {@code Class} object. These are public, protected, default
+ * (package) access, and private constructors. The elements in the array
+ * returned are not sorted and are not in any particular order. If the
+ * class has a default constructor, it is included in the returned array.
+ * This method returns an array of length 0 if this {@code Class}
+ * object represents an interface, a primitive type, an array class, or
+ * void.
+ *
+ * <p> See <em>The Java Language Specification</em>, section 8.2.
+ *
+ * @return the array of {@code Constructor} objects representing all the
+ * declared constructors of this class
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared constructors within this class
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Constructor<?>[] getDeclaredConstructors() throws SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ return copyConstructors(privateGetDeclaredConstructors(false));
+ }
+
+
+ /**
+ * Returns a {@code Field} object that reflects the specified declared
+ * field of the class or interface represented by this {@code Class}
+ * object. The {@code name} parameter is a {@code String} that
+ * specifies the simple name of the desired field. Note that this method
+ * will not reflect the {@code length} field of an array class.
+ *
+ * @param name the name of the field
+ * @return the {@code Field} object for the specified field in this
+ * class
+ * @exception NoSuchFieldException if a field with the specified name is
+ * not found.
+ * @exception NullPointerException if {@code name} is {@code null}
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared field
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Field getDeclaredField(String name)
+ throws NoSuchFieldException, SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ Field field = searchFields(privateGetDeclaredFields(false), name);
+ if (field == null) {
+ throw new NoSuchFieldException(name);
+ }
+ return field;
+ }
+
+
+ /**
+ * Returns a {@code Method} object that reflects the specified
+ * declared method of the class or interface represented by this
+ * {@code Class} object. The {@code name} parameter is a
+ * {@code String} that specifies the simple name of the desired
+ * method, and the {@code parameterTypes} parameter is an array of
+ * {@code Class} objects that identify the method's formal parameter
+ * types, in declared order. If more than one method with the same
+ * parameter types is declared in a class, and one of these methods has a
+ * return type that is more specific than any of the others, that method is
+ * returned; otherwise one of the methods is chosen arbitrarily. If the
+ * name is "<init>"or "<clinit>" a {@code NoSuchMethodException}
+ * is raised.
+ *
+ * @param name the name of the method
+ * @param parameterTypes the parameter array
+ * @return the {@code Method} object for the method of this class
+ * matching the specified name and parameters
+ * @exception NoSuchMethodException if a matching method is not found.
+ * @exception NullPointerException if {@code name} is {@code null}
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared method
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Method getDeclaredMethod(String name, Class<?>... parameterTypes)
+ throws NoSuchMethodException, SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ Method method = searchMethods(privateGetDeclaredMethods(false), name, parameterTypes);
+ if (method == null) {
+ throw new NoSuchMethodException(getName() + "." + name + argumentTypesToString(parameterTypes));
+ }
+ return method;
+ }
+
+
+ /**
+ * Returns a {@code Constructor} object that reflects the specified
+ * constructor of the class or interface represented by this
+ * {@code Class} object. The {@code parameterTypes} parameter is
+ * an array of {@code Class} objects that identify the constructor's
+ * formal parameter types, in declared order.
+ *
+ * If this {@code Class} object represents an inner class
+ * declared in a non-static context, the formal parameter types
+ * include the explicit enclosing instance as the first parameter.
+ *
+ * @param parameterTypes the parameter array
+ * @return The {@code Constructor} object for the constructor with the
+ * specified parameter list
+ * @exception NoSuchMethodException if a matching method is not found.
+ * @exception SecurityException
+ * If a security manager, <i>s</i>, is present and any of the
+ * following conditions is met:
+ *
+ * <ul>
+ *
+ * <li> invocation of
+ * {@link SecurityManager#checkMemberAccess
+ * s.checkMemberAccess(this, Member.DECLARED)} denies
+ * access to the declared constructor
+ *
+ * <li> the caller's class loader is not the same as or an
+ * ancestor of the class loader for the current class and
+ * invocation of {@link SecurityManager#checkPackageAccess
+ * s.checkPackageAccess()} denies access to the package
+ * of this class
+ *
+ * </ul>
+ *
+ * @since JDK1.1
+ */
+ public Constructor<T> getDeclaredConstructor(Class<?>... parameterTypes)
+ throws NoSuchMethodException, SecurityException {
+ // be very careful not to change the stack depth of this
+ // checkMemberAccess call for security reasons
+ // see java.lang.SecurityManager.checkMemberAccess
+ checkMemberAccess(Member.DECLARED, ClassLoader.getCallerClassLoader());
+ return getConstructor0(parameterTypes, Member.DECLARED);
+ }
+
+ /**
+ * Finds a resource with a given name. The rules for searching resources
+ * associated with a given class are implemented by the defining
+ * {@linkplain ClassLoader class loader} of the class. This method
+ * delegates to this object's class loader. If this object was loaded by
+ * the bootstrap class loader, the method delegates to {@link
+ * ClassLoader#getSystemResourceAsStream}.
+ *
+ * <p> Before delegation, an absolute resource name is constructed from the
+ * given resource name using this algorithm:
+ *
+ * <ul>
+ *
+ * <li> If the {@code name} begins with a {@code '/'}
+ * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
+ * portion of the {@code name} following the {@code '/'}.
+ *
+ * <li> Otherwise, the absolute name is of the following form:
+ *
+ * <blockquote>
+ * {@code modified_package_name/name}
+ * </blockquote>
+ *
+ * <p> Where the {@code modified_package_name} is the package name of this
+ * object with {@code '/'} substituted for {@code '.'}
+ * (<tt>'\u002e'</tt>).
+ *
+ * </ul>
+ *
+ * @param name name of the desired resource
+ * @return A {@link java.io.InputStream} object or {@code null} if
+ * no resource with this name is found
+ * @throws NullPointerException If {@code name} is {@code null}
+ * @since JDK1.1
+ */
+ public InputStream getResourceAsStream(String name) {
+ name = resolveName(name);
+ ClassLoader cl = getClassLoader0();
+ if (cl==null) {
+ // A system class.
+ return ClassLoader.getSystemResourceAsStream(name);
+ }
+ return cl.getResourceAsStream(name);
+ }
+
+ /**
+ * Finds a resource with a given name. The rules for searching resources
+ * associated with a given class are implemented by the defining
+ * {@linkplain ClassLoader class loader} of the class. This method
+ * delegates to this object's class loader. If this object was loaded by
+ * the bootstrap class loader, the method delegates to {@link
+ * ClassLoader#getSystemResource}.
+ *
+ * <p> Before delegation, an absolute resource name is constructed from the
+ * given resource name using this algorithm:
+ *
+ * <ul>
+ *
+ * <li> If the {@code name} begins with a {@code '/'}
+ * (<tt>'\u002f'</tt>), then the absolute name of the resource is the
+ * portion of the {@code name} following the {@code '/'}.
+ *
+ * <li> Otherwise, the absolute name is of the following form:
+ *
+ * <blockquote>
+ * {@code modified_package_name/name}
+ * </blockquote>
+ *
+ * <p> Where the {@code modified_package_name} is the package name of this
+ * object with {@code '/'} substituted for {@code '.'}
+ * (<tt>'\u002e'</tt>).
+ *
+ * </ul>
+ *
+ * @param name name of the desired resource
+ * @return A {@link java.net.URL} object or {@code null} if no
+ * resource with this name is found
+ * @since JDK1.1
+ */
+ public java.net.URL getResource(String name) {
+ name = resolveName(name);
+ ClassLoader cl = getClassLoader0();
+ if (cl==null) {
+ // A system class.
+ return ClassLoader.getSystemResource(name);
+ }
+ return cl.getResource(name);
+ }
+
+
+
+ /** protection domain returned when the internal domain is null */
+ private static java.security.ProtectionDomain allPermDomain;
+
+
+ /**
+ * Returns the {@code ProtectionDomain} of this class. If there is a
+ * security manager installed, this method first calls the security
+ * manager's {@code checkPermission} method with a
+ * {@code RuntimePermission("getProtectionDomain")} permission to
+ * ensure it's ok to get the
+ * {@code ProtectionDomain}.
+ *
+ * @return the ProtectionDomain of this class
+ *
+ * @throws SecurityException
+ * if a security manager exists and its
+ * {@code checkPermission} method doesn't allow
+ * getting the ProtectionDomain.
+ *
+ * @see java.security.ProtectionDomain
+ * @see SecurityManager#checkPermission
+ * @see java.lang.RuntimePermission
+ * @since 1.2
+ */
+ public java.security.ProtectionDomain getProtectionDomain() {
+ SecurityManager sm = System.getSecurityManager();
+ if (sm != null) {
+ sm.checkPermission(SecurityConstants.GET_PD_PERMISSION);
+ }
+ java.security.ProtectionDomain pd = getProtectionDomain0();
+ if (pd == null) {
+ if (allPermDomain == null) {
+ java.security.Permissions perms =
+ new java.security.Permissions();
+ perms.add(SecurityConstants.ALL_PERMISSION);
+ allPermDomain =
+ new java.security.ProtectionDomain(null, perms);
+ }
+ pd = allPermDomain;
+ }
+ return pd;
+ }
+
+
+ /**
+ * Returns the ProtectionDomain of this class.
+ */
+ private native java.security.ProtectionDomain getProtectionDomain0();
+
+
+ /**
+ * Set the ProtectionDomain for this class. Called by
+ * ClassLoader.defineClass.
+ */
+ native void setProtectionDomain0(java.security.ProtectionDomain pd);
+
+
+ /*
+ * Return the Virtual Machine's Class object for the named
+ * primitive type.
+ */
+ static native Class getPrimitiveClass(String name);
+
+
+ /*
+ * Check if client is allowed to access members. If access is denied,
+ * throw a SecurityException.
+ *
+ * Be very careful not to change the stack depth of this checkMemberAccess
+ * call for security reasons.
+ * See java.lang.SecurityManager.checkMemberAccess.
+ *
+ * <p> Default policy: allow all clients access with normal Java access
+ * control.
+ */
+ private void checkMemberAccess(int which, ClassLoader ccl) {
+ SecurityManager s = System.getSecurityManager();
+ if (s != null) {
+ s.checkMemberAccess(this, which);
+ ClassLoader cl = getClassLoader0();
+ if ((ccl != null) && (ccl != cl) &&
+ ((cl == null) || !cl.isAncestor(ccl))) {
+ String name = this.getName();
+ int i = name.lastIndexOf('.');
+ if (i != -1) {
+ s.checkPackageAccess(name.substring(0, i));
+ }
+ }
+ }
+ }
+
+ /**
+ * Add a package name prefix if the name is not absolute Remove leading "/"
+ * if name is absolute
+ */
+ private String resolveName(String name) {
+ if (name == null) {
+ return name;
+ }
+ if (!name.startsWith("/")) {
+ Class c = this;
+ while (c.isArray()) {
+ c = c.getComponentType();
+ }
+ String baseName = c.getName();
+ int index = baseName.lastIndexOf('.');
+ if (index != -1) {
+ name = baseName.substring(0, index).replace('.', '/')
+ +"/"+name;
+ }
+ } else {
+ name = name.substring(1);
+ }
+ return name;
+ }
+
+ /**
+ * Reflection support.
+ */
+
+ // Caches for certain reflective results
+ private static boolean useCaches = true;
+ private volatile transient SoftReference declaredFields;
+ private volatile transient SoftReference publicFields;
+ private volatile transient SoftReference declaredMethods;
+ private volatile transient SoftReference publicMethods;
+ private volatile transient SoftReference declaredConstructors;
+ private volatile transient SoftReference publicConstructors;
+ // Intermediate results for getFields and getMethods
+ private volatile transient SoftReference declaredPublicFields;
+ private volatile transient SoftReference declaredPublicMethods;
+
+ // Incremented by the VM on each call to JVM TI RedefineClasses()
+ // that redefines this class or a superclass.
+ private volatile transient int classRedefinedCount = 0;
+
+ // Value of classRedefinedCount when we last cleared the cached values
+ // that are sensitive to class redefinition.
+ private volatile transient int lastRedefinedCount = 0;
+
+ // Clears cached values that might possibly have been obsoleted by
+ // a class redefinition.
+ private void clearCachesOnClassRedefinition() {
+ if (lastRedefinedCount != classRedefinedCount) {
+ declaredFields = publicFields = declaredPublicFields = null;
+ declaredMethods = publicMethods = declaredPublicMethods = null;
+ declaredConstructors = publicConstructors = null;
+ annotations = declaredAnnotations = null;
+
+ // Use of "volatile" (and synchronization by caller in the case
+ // of annotations) ensures that no thread sees the update to
+ // lastRedefinedCount before seeing the caches cleared.
+ // We do not guard against brief windows during which multiple
+ // threads might redundantly work to fill an empty cache.
+ lastRedefinedCount = classRedefinedCount;
+ }
+ }
+
+ // Generic signature handling
+ private native String getGenericSignature();
+
+ // Generic info repository; lazily initialized
+ private transient ClassRepository genericInfo;
+
+ // accessor for factory
+ private GenericsFactory getFactory() {
+ // create scope and factory
+ return CoreReflectionFactory.make(this, ClassScope.make(this));
+ }
+
+ // accessor for generic info repository
+ private ClassRepository getGenericInfo() {
+ // lazily initialize repository if necessary
+ if (genericInfo == null) {
+ // create and cache generic info repository
+ genericInfo = ClassRepository.make(getGenericSignature(),
+ getFactory());
+ }
+ return genericInfo; //return cached repository
+ }
+
+ // Annotations handling
+ private native byte[] getRawAnnotations();
+
+ native ConstantPool getConstantPool();
+
+ //
+ //
+ // java.lang.reflect.Field handling
+ //
+ //
+
+ // Returns an array of "root" fields. These Field objects must NOT
+ // be propagated to the outside world, but must instead be copied
+ // via ReflectionFactory.copyField.
+ private Field[] privateGetDeclaredFields(boolean publicOnly) {
+ checkInitted();
+ Field[] res = null;
+ if (useCaches) {
+ clearCachesOnClassRedefinition();
+ if (publicOnly) {
+ if (declaredPublicFields != null) {
+ res = (Field[]) declaredPublicFields.get();
+ }
+ } else {
+ if (declaredFields != null) {
+ res = (Field[]) declaredFields.get();
+ }
+ }
+ if (res != null) return res;
+ }
+ // No cached value available; request value from VM
+ res = Reflection.filterFields(this, getDeclaredFields0(publicOnly));
+ if (useCaches) {
+ if (publicOnly) {
+ declaredPublicFields = new SoftReference(res);
+ } else {
+ declaredFields = new SoftReference(res);
+ }
+ }
+ return res;
+ }
+
+ // Returns an array of "root" fields. These Field objects must NOT
+ // be propagated to the outside world, but must instead be copied
+ // via ReflectionFactory.copyField.
+ private Field[] privateGetPublicFields(Set traversedInterfaces) {
+ checkInitted();
+ Field[] res = null;
+ if (useCaches) {
+ clearCachesOnClassRedefinition();
+ if (publicFields != null) {
+ res = (Field[]) publicFields.get();
+ }
+ if (res != null) return res;
+ }
+
+ // No cached value available; compute value recursively.
+ // Traverse in correct order for getField().
+ List fields = new ArrayList();
+ if (traversedInterfaces == null) {
+ traversedInterfaces = new HashSet();
+ }
+
+ // Local fields
+ Field[] tmp = privateGetDeclaredFields(true);
+ addAll(fields, tmp);
+
+ // Direct superinterfaces, recursively
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++) {
+ Class c = interfaces[i];
+ if (!traversedInterfaces.contains(c)) {
+ traversedInterfaces.add(c);
+ addAll(fields, c.privateGetPublicFields(traversedInterfaces));
+ }
+ }
+
+ // Direct superclass, recursively
+ if (!isInterface()) {
+ Class c = getSuperclass();
+ if (c != null) {
+ addAll(fields, c.privateGetPublicFields(traversedInterfaces));
+ }
+ }
+
+ res = new Field[fields.size()];
+ fields.toArray(res);
+ if (useCaches) {
+ publicFields = new SoftReference(res);
+ }
+ return res;
+ }
+
+ private static void addAll(Collection c, Field[] o) {
+ for (int i = 0; i < o.length; i++) {
+ c.add(o[i]);
+ }
+ }
+
+
+ //
+ //
+ // java.lang.reflect.Constructor handling
+ //
+ //
+
+ // Returns an array of "root" constructors. These Constructor
+ // objects must NOT be propagated to the outside world, but must
+ // instead be copied via ReflectionFactory.copyConstructor.
+ private Constructor[] privateGetDeclaredConstructors(boolean publicOnly) {
+ checkInitted();
+ Constructor[] res = null;
+ if (useCaches) {
+ clearCachesOnClassRedefinition();
+ if (publicOnly) {
+ if (publicConstructors != null) {
+ res = (Constructor[]) publicConstructors.get();
+ }
+ } else {
+ if (declaredConstructors != null) {
+ res = (Constructor[]) declaredConstructors.get();
+ }
+ }
+ if (res != null) return res;
+ }
+ // No cached value available; request value from VM
+ if (isInterface()) {
+ res = new Constructor[0];
+ } else {
+ res = getDeclaredConstructors0(publicOnly);
+ }
+ if (useCaches) {
+ if (publicOnly) {
+ publicConstructors = new SoftReference(res);
+ } else {
+ declaredConstructors = new SoftReference(res);
+ }
+ }
+ return res;
+ }
+
+ //
+ //
+ // java.lang.reflect.Method handling
+ //
+ //
+
+ // Returns an array of "root" methods. These Method objects must NOT
+ // be propagated to the outside world, but must instead be copied
+ // via ReflectionFactory.copyMethod.
+ private Method[] privateGetDeclaredMethods(boolean publicOnly) {
+ checkInitted();
+ Method[] res = null;
+ if (useCaches) {
+ clearCachesOnClassRedefinition();
+ if (publicOnly) {
+ if (declaredPublicMethods != null) {
+ res = (Method[]) declaredPublicMethods.get();
+ }
+ } else {
+ if (declaredMethods != null) {
+ res = (Method[]) declaredMethods.get();
+ }
+ }
+ if (res != null) return res;
+ }
+ // No cached value available; request value from VM
+ res = Reflection.filterMethods(this, getDeclaredMethods0(publicOnly));
+ if (useCaches) {
+ if (publicOnly) {
+ declaredPublicMethods = new SoftReference(res);
+ } else {
+ declaredMethods = new SoftReference(res);
+ }
+ }
+ return res;
+ }
+
+ static class MethodArray {
+ private Method[] methods;
+ private int length;
+
+ MethodArray() {
+ methods = new Method[20];
+ length = 0;
+ }
+
+ void add(Method m) {
+ if (length == methods.length) {
+ methods = Arrays.copyOf(methods, 2 * methods.length);
+ }
+ methods[length++] = m;
+ }
+
+ void addAll(Method[] ma) {
+ for (int i = 0; i < ma.length; i++) {
+ add(ma[i]);
+ }
+ }
+
+ void addAll(MethodArray ma) {
+ for (int i = 0; i < ma.length(); i++) {
+ add(ma.get(i));
+ }
+ }
+
+ void addIfNotPresent(Method newMethod) {
+ for (int i = 0; i < length; i++) {
+ Method m = methods[i];
+ if (m == newMethod || (m != null && m.equals(newMethod))) {
+ return;
+ }
+ }
+ add(newMethod);
+ }
+
+ void addAllIfNotPresent(MethodArray newMethods) {
+ for (int i = 0; i < newMethods.length(); i++) {
+ Method m = newMethods.get(i);
+ if (m != null) {
+ addIfNotPresent(m);
+ }
+ }
+ }
+
+ int length() {
+ return length;
+ }
+
+ Method get(int i) {
+ return methods[i];
+ }
+
+ void removeByNameAndSignature(Method toRemove) {
+ for (int i = 0; i < length; i++) {
+ Method m = methods[i];
+ if (m != null &&
+ m.getReturnType() == toRemove.getReturnType() &&
+ m.getName() == toRemove.getName() &&
+ arrayContentsEq(m.getParameterTypes(),
+ toRemove.getParameterTypes())) {
+ methods[i] = null;
+ }
+ }
+ }
+
+ void compactAndTrim() {
+ int newPos = 0;
+ // Get rid of null slots
+ for (int pos = 0; pos < length; pos++) {
+ Method m = methods[pos];
+ if (m != null) {
+ if (pos != newPos) {
+ methods[newPos] = m;
+ }
+ newPos++;
+ }
+ }
+ if (newPos != methods.length) {
+ methods = Arrays.copyOf(methods, newPos);
+ }
+ }
+
+ Method[] getArray() {
+ return methods;
+ }
+ }
+
+
+ // Returns an array of "root" methods. These Method objects must NOT
+ // be propagated to the outside world, but must instead be copied
+ // via ReflectionFactory.copyMethod.
+ private Method[] privateGetPublicMethods() {
+ checkInitted();
+ Method[] res = null;
+ if (useCaches) {
+ clearCachesOnClassRedefinition();
+ if (publicMethods != null) {
+ res = (Method[]) publicMethods.get();
+ }
+ if (res != null) return res;
+ }
+
+ // No cached value available; compute value recursively.
+ // Start by fetching public declared methods
+ MethodArray methods = new MethodArray();
+ {
+ Method[] tmp = privateGetDeclaredMethods(true);
+ methods.addAll(tmp);
+ }
+ // Now recur over superclass and direct superinterfaces.
+ // Go over superinterfaces first so we can more easily filter
+ // out concrete implementations inherited from superclasses at
+ // the end.
+ MethodArray inheritedMethods = new MethodArray();
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++) {
+ inheritedMethods.addAll(interfaces[i].privateGetPublicMethods());
+ }
+ if (!isInterface()) {
+ Class c = getSuperclass();
+ if (c != null) {
+ MethodArray supers = new MethodArray();
+ supers.addAll(c.privateGetPublicMethods());
+ // Filter out concrete implementations of any
+ // interface methods
+ for (int i = 0; i < supers.length(); i++) {
+ Method m = supers.get(i);
+ if (m != null && !Modifier.isAbstract(m.getModifiers())) {
+ inheritedMethods.removeByNameAndSignature(m);
+ }
+ }
+ // Insert superclass's inherited methods before
+ // superinterfaces' to satisfy getMethod's search
+ // order
+ supers.addAll(inheritedMethods);
+ inheritedMethods = supers;
+ }
+ }
+ // Filter out all local methods from inherited ones
+ for (int i = 0; i < methods.length(); i++) {
+ Method m = methods.get(i);
+ inheritedMethods.removeByNameAndSignature(m);
+ }
+ methods.addAllIfNotPresent(inheritedMethods);
+ methods.compactAndTrim();
+ res = methods.getArray();
+ if (useCaches) {
+ publicMethods = new SoftReference(res);
+ }
+ return res;
+ }
+
+
+ //
+ // Helpers for fetchers of one field, method, or constructor
+ //
+
+ private Field searchFields(Field[] fields, String name) {
+ String internedName = name.intern();
+ for (int i = 0; i < fields.length; i++) {
+ if (fields[i].getName() == internedName) {
+ return getReflectionFactory().copyField(fields[i]);
+ }
+ }
+ return null;
+ }
+
+ private Field getField0(String name) throws NoSuchFieldException {
+ // Note: the intent is that the search algorithm this routine
+ // uses be equivalent to the ordering imposed by
+ // privateGetPublicFields(). It fetches only the declared
+ // public fields for each class, however, to reduce the number
+ // of Field objects which have to be created for the common
+ // case where the field being requested is declared in the
+ // class which is being queried.
+ Field res = null;
+ // Search declared public fields
+ if ((res = searchFields(privateGetDeclaredFields(true), name)) != null) {
+ return res;
+ }
+ // Direct superinterfaces, recursively
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++) {
+ Class c = interfaces[i];
+ if ((res = c.getField0(name)) != null) {
+ return res;
+ }
+ }
+ // Direct superclass, recursively
+ if (!isInterface()) {
+ Class c = getSuperclass();
+ if (c != null) {
+ if ((res = c.getField0(name)) != null) {
+ return res;
+ }
+ }
+ }
+ return null;
+ }
+
+ private static Method searchMethods(Method[] methods,
+ String name,
+ Class[] parameterTypes)
+ {
+ Method res = null;
+ String internedName = name.intern();
+ for (int i = 0; i < methods.length; i++) {
+ Method m = methods[i];
+ if (m.getName() == internedName
+ && arrayContentsEq(parameterTypes, m.getParameterTypes())
+ && (res == null
+ || res.getReturnType().isAssignableFrom(m.getReturnType())))
+ res = m;
+ }
+
+ return (res == null ? res : getReflectionFactory().copyMethod(res));
+ }
+
+
+ private Method getMethod0(String name, Class[] parameterTypes) {
+ // Note: the intent is that the search algorithm this routine
+ // uses be equivalent to the ordering imposed by
+ // privateGetPublicMethods(). It fetches only the declared
+ // public methods for each class, however, to reduce the
+ // number of Method objects which have to be created for the
+ // common case where the method being requested is declared in
+ // the class which is being queried.
+ Method res = null;
+ // Search declared public methods
+ if ((res = searchMethods(privateGetDeclaredMethods(true),
+ name,
+ parameterTypes)) != null) {
+ return res;
+ }
+ // Search superclass's methods
+ if (!isInterface()) {
+ Class c = getSuperclass();
+ if (c != null) {
+ if ((res = c.getMethod0(name, parameterTypes)) != null) {
+ return res;
+ }
+ }
+ }
+ // Search superinterfaces' methods
+ Class[] interfaces = getInterfaces();
+ for (int i = 0; i < interfaces.length; i++) {
+ Class c = interfaces[i];
+ if ((res = c.getMethod0(name, parameterTypes)) != null) {
+ return res;
+ }
+ }
+ // Not found
+ return null;
+ }
+
+ private Constructor<T> getConstructor0(Class[] parameterTypes,
+ int which) throws NoSuchMethodException
+ {
+ Constructor[] constructors = privateGetDeclaredConstructors((which == Member.PUBLIC));
+ for (int i = 0; i < constructors.length; i++) {
+ if (arrayContentsEq(parameterTypes,
+ constructors[i].getParameterTypes())) {
+ return getReflectionFactory().copyConstructor(constructors[i]);
+ }
+ }
+ throw new NoSuchMethodException(getName() + ".<init>" + argumentTypesToString(parameterTypes));
+ }
+
+ //
+ // Other helpers and base implementation
+ //
+
+ private static boolean arrayContentsEq(Object[] a1, Object[] a2) {
+ if (a1 == null) {
+ return a2 == null || a2.length == 0;
+ }
+
+ if (a2 == null) {
+ return a1.length == 0;
+ }
+
+ if (a1.length != a2.length) {
+ return false;
+ }
+
+ for (int i = 0; i < a1.length; i++) {
+ if (a1[i] != a2[i]) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
+ private static Field[] copyFields(Field[] arg) {
+ Field[] out = new Field[arg.length];
+ ReflectionFactory fact = getReflectionFactory();
+ for (int i = 0; i < arg.length; i++) {
+ out[i] = fact.copyField(arg[i]);
+ }
+ return out;
+ }
+
+ private static Method[] copyMethods(Method[] arg) {
+ Method[] out = new Method[arg.length];
+ ReflectionFactory fact = getReflectionFactory();
+ for (int i = 0; i < arg.length; i++) {
+ out[i] = fact.copyMethod(arg[i]);
+ }
+ return out;
+ }
+
+ private static Constructor[] copyConstructors(Constructor[] arg) {
+ Constructor[] out = new Constructor[arg.length];
+ ReflectionFactory fact = getReflectionFactory();
+ for (int i = 0; i < arg.length; i++) {
+ out[i] = fact.copyConstructor(arg[i]);
+ }
+ return out;
+ }
+
+ private native Field[] getDeclaredFields0(boolean publicOnly);
+ private native Method[] getDeclaredMethods0(boolean publicOnly);
+ private native Constructor[] getDeclaredConstructors0(boolean publicOnly);
+ private native Class[] getDeclaredClasses0();
+
+ private static String argumentTypesToString(Class[] argTypes) {
+ StringBuilder buf = new StringBuilder();
+ buf.append("(");
+ if (argTypes != null) {
+ for (int i = 0; i < argTypes.length; i++) {
+ if (i > 0) {
+ buf.append(", ");
+ }
+ Class c = argTypes[i];
+ buf.append((c == null) ? "null" : c.getName());
+ }
+ }
+ buf.append(")");
+ return buf.toString();
+ }
+
+ /** use serialVersionUID from JDK 1.1 for interoperability */
+ private static final long serialVersionUID = 3206093459760846163L;
+
+
+ /**
+ * Class Class is special cased within the Serialization Stream Protocol.
+ *
+ * A Class instance is written initially into an ObjectOutputStream in the
+ * following format:
+ * <pre>
+ * {@code TC_CLASS} ClassDescriptor
+ * A ClassDescriptor is a special cased serialization of
+ * a {@code java.io.ObjectStreamClass} instance.
+ * </pre>
+ * A new handle is generated for the initial time the class descriptor
+ * is written into the stream. Future references to the class descriptor
+ * are written as references to the initial class descriptor instance.
+ *
+ * @see java.io.ObjectStreamClass
+ */
+ private static final ObjectStreamField[] serialPersistentFields =
+ new ObjectStreamField[0];
+
+
+ /**
+ * Returns the assertion status that would be assigned to this
+ * class if it were to be initialized at the time this method is invoked.
+ * If this class has had its assertion status set, the most recent
+ * setting will be returned; otherwise, if any package default assertion
+ * status pertains to this class, the most recent setting for the most
+ * specific pertinent package default assertion status is returned;
+ * otherwise, if this class is not a system class (i.e., it has a
+ * class loader) its class loader's default assertion status is returned;
+ * otherwise, the system class default assertion status is returned.
+ * <p>
+ * Few programmers will have any need for this method; it is provided
+ * for the benefit of the JRE itself. (It allows a class to determine at
+ * the time that it is initialized whether assertions should be enabled.)
+ * Note that this method is not guaranteed to return the actual
+ * assertion status that was (or will be) associated with the specified
+ * class when it was (or will be) initialized.
+ *
+ * @return the desired assertion status of the specified class.
+ * @see java.lang.ClassLoader#setClassAssertionStatus
+ * @see java.lang.ClassLoader#setPackageAssertionStatus
+ * @see java.lang.ClassLoader#setDefaultAssertionStatus
+ * @since 1.4
+ */
+ public boolean desiredAssertionStatus() {
+ ClassLoader loader = getClassLoader();
+ // If the loader is null this is a system class, so ask the VM
+ if (loader == null)
+ return desiredAssertionStatus0(this);
+
+ synchronized(loader) {
+ // If the classloader has been initialized with
+ // the assertion directives, ask it. Otherwise,
+ // ask the VM.
+ return (loader.classAssertionStatus == null ?
+ desiredAssertionStatus0(this) :
+ loader.desiredAssertionStatus(getName()));
+ }
+ }
+
+ // Retrieves the desired assertion status of this class from the VM
+ private static native boolean desiredAssertionStatus0(Class clazz);
+
+ /**
+ * Returns true if and only if this class was declared as an enum in the
+ * source code.
+ *
+ * @return true if and only if this class was declared as an enum in the
+ * source code
+ * @since 1.5
+ */
+ public boolean isEnum() {
+ // An enum must both directly extend java.lang.Enum and have
+ // the ENUM bit set; classes for specialized enum constants
+ // don't do the former.
+ return (this.getModifiers() & ENUM) != 0 &&
+ this.getSuperclass() == java.lang.Enum.class;
+ }
+
+ // Fetches the factory for reflective objects
+ private static ReflectionFactory getReflectionFactory() {
+ if (reflectionFactory == null) {
+ reflectionFactory = (ReflectionFactory)
+ java.security.AccessController.doPrivileged
+ (new sun.reflect.ReflectionFactory.GetReflectionFactoryAction());
+ }
+ return reflectionFactory;
+ }
+ private static ReflectionFactory reflectionFactory;
+
+ // To be able to query system properties as soon as they're available
+ private static boolean initted = false;
+ private static void checkInitted() {
+ if (initted) return;
+ AccessController.doPrivileged(new PrivilegedAction() {
+ public Object run() {
+ // Tests to ensure the system properties table is fully
+ // initialized. This is needed because reflection code is
+ // called very early in the initialization process (before
+ // command-line arguments have been parsed and therefore
+ // these user-settable properties installed.) We assume that
+ // if System.out is non-null then the System class has been
+ // fully initialized and that the bulk of the startup code
+ // has been run.
+
+ if (System.out == null) {
+ // java.lang.System not yet fully initialized
+ return null;
+ }
+
+ String val =
+ System.getProperty("sun.reflect.noCaches");
+ if (val != null && val.equals("true")) {
+ useCaches = false;
+ }
+
+ initted = true;
+ return null;
+ }
+ });
+ }
+
+ /**
+ * Returns the elements of this enum class or null if this
+ * Class object does not represent an enum type.
+ *
+ * @return an array containing the values comprising the enum class
+ * represented by this Class object in the order they're
+ * declared, or null if this Class object does not
+ * represent an enum type
+ * @since 1.5
+ */
+ public T[] getEnumConstants() {
+ T[] values = getEnumConstantsShared();
+ return (values != null) ? values.clone() : null;
+ }
+
+ /**
+ * Returns the elements of this enum class or null if this
+ * Class object does not represent an enum type;
+ * identical to getEnumConstantsShared except that
+ * the result is uncloned, cached, and shared by all callers.
+ */
+ T[] getEnumConstantsShared() {
+ if (enumConstants == null) {
+ if (!isEnum()) return null;
+ try {
+ final Method values = getMethod("values");
+ java.security.AccessController.doPrivileged
+ (new java.security.PrivilegedAction() {
+ public Object run() {
+ values.setAccessible(true);
+ return null;
+ }
+ });
+ enumConstants = (T[])values.invoke(null);
+ }
+ // These can happen when users concoct enum-like classes
+ // that don't comply with the enum spec.
+ catch (InvocationTargetException ex) { return null; }
+ catch (NoSuchMethodException ex) { return null; }
+ catch (IllegalAccessException ex) { return null; }
+ }
+ return enumConstants;
+ }
+ private volatile transient T[] enumConstants = null;
+
+ /**
+ * Returns a map from simple name to enum constant. This package-private
+ * method is used internally by Enum to implement
+ * public static <T extends Enum<T>> T valueOf(Class<T>, String)
+ * efficiently. Note that the map is returned by this method is
+ * created lazily on first use. Typically it won't ever get created.
+ */
+ Map<String, T> enumConstantDirectory() {
+ if (enumConstantDirectory == null) {
+ T[] universe = getEnumConstantsShared();
+ if (universe == null)
+ throw new IllegalArgumentException(
+ getName() + " is not an enum type");
+ Map<String, T> m = new HashMap<String, T>(2 * universe.length);
+ for (T constant : universe)
+ m.put(((Enum)constant).name(), constant);
+ enumConstantDirectory = m;
+ }
+ return enumConstantDirectory;
+ }
+ private volatile transient Map<String, T> enumConstantDirectory = null;
+
+ /**
+ * Casts an object to the class or interface represented
+ * by this {@code Class} object.
+ *
+ * @param obj the object to be cast
+ * @return the object after casting, or null if obj is null
+ *
+ * @throws ClassCastException if the object is not
+ * null and is not assignable to the type T.
+ *
+ * @since 1.5
+ */
+ public T cast(Object obj) {
+ if (obj != null && !isInstance(obj))
+ throw new ClassCastException(cannotCastMsg(obj));
+ return (T) obj;
+ }
+
+ private String cannotCastMsg(Object obj) {
+ return "Cannot cast " + obj.getClass().getName() + " to " + getName();
+ }
+
+ /**
+ * Casts this {@code Class} object to represent a subclass of the class
+ * represented by the specified class object. Checks that that the cast
+ * is valid, and throws a {@code ClassCastException} if it is not. If
+ * this method succeeds, it always returns a reference to this class object.
+ *
+ * <p>This method is useful when a client needs to "narrow" the type of
+ * a {@code Class} object to pass it to an API that restricts the
+ * {@code Class} objects that it is willing to accept. A cast would
+ * generate a compile-time warning, as the correctness of the cast
+ * could not be checked at runtime (because generic types are implemented
+ * by erasure).
+ *
+ * @return this {@code Class} object, cast to represent a subclass of
+ * the specified class object.
+ * @throws ClassCastException if this {@code Class} object does not
+ * represent a subclass of the specified class (here "subclass" includes
+ * the class itself).
+ * @since 1.5
+ */
+ public <U> Class<? extends U> asSubclass(Class<U> clazz) {
+ if (clazz.isAssignableFrom(this))
+ return (Class<? extends U>) this;
+ else
+ throw new ClassCastException(this.toString());
+ }
+
+ /**
+ * @throws NullPointerException {@inheritDoc}
+ * @since 1.5
+ */
+ public <A extends Annotation> A getAnnotation(Class<A> annotationClass) {
+ if (annotationClass == null)
+ throw new NullPointerException();
+
+ initAnnotationsIfNecessary();
+ return (A) annotations.get(annotationClass);
+ }
+
+ /**
+ * @throws NullPointerException {@inheritDoc}
+ * @since 1.5
+ */
+ public boolean isAnnotationPresent(
+ Class<? extends Annotation> annotationClass) {
+ if (annotationClass == null)
+ throw new NullPointerException();
+
+ return getAnnotation(annotationClass) != null;
+ }
+
+
+ private static Annotation[] EMPTY_ANNOTATIONS_ARRAY = new Annotation[0];
+
+ /**
+ * @since 1.5
+ */
+ public Annotation[] getAnnotations() {
+ initAnnotationsIfNecessary();
+ return annotations.values().toArray(EMPTY_ANNOTATIONS_ARRAY);
+ }
+
+ /**
+ * @since 1.5
+ */
+ public Annotation[] getDeclaredAnnotations() {
+ initAnnotationsIfNecessary();
+ return declaredAnnotations.values().toArray(EMPTY_ANNOTATIONS_ARRAY);
+ }
+
+ // Annotations cache
+ private transient Map<Class, Annotation> annotations;
+ private transient Map<Class, Annotation> declaredAnnotations;
+
+ private synchronized void initAnnotationsIfNecessary() {
+ clearCachesOnClassRedefinition();
+ if (annotations != null)
+ return;
+ declaredAnnotations = AnnotationParser.parseAnnotations(
+ getRawAnnotations(), getConstantPool(), this);
+ Class<?> superClass = getSuperclass();
+ if (superClass == null) {
+ annotations = declaredAnnotations;
+ } else {
+ annotations = new HashMap<Class, Annotation>();
+ superClass.initAnnotationsIfNecessary();
+ for (Map.Entry<Class, Annotation> e : superClass.annotations.entrySet()) {
+ Class annotationClass = e.getKey();
+ if (AnnotationType.getInstance(annotationClass).isInherited())
+ annotations.put(annotationClass, e.getValue());
+ }
+ annotations.putAll(declaredAnnotations);
+ }
+ }
+
+ // Annotation types cache their internal (AnnotationType) form
+
+ private AnnotationType annotationType;
+
+ void setAnnotationType(AnnotationType type) {
+ annotationType = type;
+ }
+
+ AnnotationType getAnnotationType() {
+ return annotationType;
+ }
+}