/*

* Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.

* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*

*/

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.CallerSensitive;

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 java.lang.reflect.Proxy;

import sun.reflect.annotation.*;

import sun.reflect.misc.ReflectUtil;

/**

* 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. See Section 15.8.2 of

* <cite>The Java&trade; Language Specification</cite>.

* 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();

}

/*

* Private constructor. Only the Java Virtual Machine creates Class objects.

* This constructor is not used and prevents the default constructor being

* generated.

*/

private Class(ClassLoader loader) {

// Initialize final field for classLoader. The initialization value of non-null

// prevents future JIT optimizations from assuming this final field is null.

classLoader = loader;

}

/**

* 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

*/

@CallerSensitive

public static Class<?> forName(String className)

throws ClassNotFoundException {

Class<?> caller = Reflection.getCallerClass();

return forName0(className, true, ClassLoader.getClassLoader(caller), caller);

}

/**

* 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

*/

@CallerSensitive

public static Class<?> forName(String name, boolean initialize,

ClassLoader loader)

throws ClassNotFoundException

{

Class<?> caller = null;

SecurityManager sm = System.getSecurityManager();

if (sm != null) {

// Reflective call to get caller class is only needed if a security manager

// is present. Avoid the overhead of making this call otherwise.

caller = Reflection.getCallerClass();

if (loader == null) {

ClassLoader ccl = ClassLoader.getClassLoader(caller);

if (ccl != null) {

sm.checkPermission(

SecurityConstants.GET_CLASSLOADER_PERMISSION);

}

}

}

return forName0(name, initialize, loader, caller);

}

/** Called after security check for system loader access checks have been made. */

private static native Class<?> forName0(String name, boolean initialize,

ClassLoader loader,

Class<?> caller)

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>

*

*/

@CallerSensitive

public T newInstance()

throws InstantiationException, IllegalAccessException

{

if (System.getSecurityManager() != null) {

checkMemberAccess(Member.PUBLIC, Reflection.getCallerClass(), false);

}

// 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<Void>() {

public Void 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();

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

* <cite>The Java&trade; Language Specification</cite>.

*

* <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> &nbsp;&nbsp;&nbsp; <th> Encoding

* <tr><td> boolean <td> &nbsp;&nbsp;&nbsp; <td align=center> Z

* <tr><td> byte <td> &nbsp;&nbsp;&nbsp; <td align=center> B

* <tr><td> char <td> &nbsp;&nbsp;&nbsp; <td align=center> C

* <tr><td> class or interface

* <td> &nbsp;&nbsp;&nbsp; <td align=center> L<i>classname</i>;

* <tr><td> double <td> &nbsp;&nbsp;&nbsp; <td align=center> D

* <tr><td> float <td> &nbsp;&nbsp;&nbsp; <td align=center> F

* <tr><td> int <td> &nbsp;&nbsp;&nbsp; <td align=center> I

* <tr><td> long <td> &nbsp;&nbsp;&nbsp; <td align=center> J

* <tr><td> short <td> &nbsp;&nbsp;&nbsp; <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() {

String name = this.name;

if (name == null)

this.name = 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

*/

@CallerSensitive

public ClassLoader getClassLoader() {

ClassLoader cl = getClassLoader0();

if (cl == null)

return null;

SecurityManager sm = System.getSecurityManager();

if (sm != null) {

ClassLoader.checkClassLoaderPermission(cl, Reflection.getCallerClass());

}

return cl;

}

// Package-private to allow ClassLoader access

ClassLoader getClassLoader0() { return classLoader; }

// Initialized in JVM not by private constructor

// This field is filtered from reflection access, i.e. getDeclaredField

// will throw NoSuchFieldException

private final ClassLoader classLoader;

/**

* 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 java.lang.reflect.GenericSignatureFormatError if the generic

* signature of this generic declaration does not conform to

* the format specified in

* <cite>The Java&trade; Virtual Machine Specification</cite>

* @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 java.lang.reflect.GenericSignatureFormatError if the generic

* class signature does not conform to the format specified in

* <cite>The Java&trade; Virtual Machine Specification</cite>

* @throws TypeNotPresentException if the generic superclass

* refers to a non-existent type declaration

* @throws java.lang.reflect.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 java.lang.reflect.GenericSignatureFormatError

* if the generic class signature does not conform to the format

* specified in

* <cite>The Java&trade; Virtual Machine Specification</cite>

* @throws TypeNotPresentException if any of the generic

* superinterfaces refers to a non-existent type declaration

* @throws java.lang.reflect.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

*/

@CallerSensitive

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]);

// Perform access check

Class<?> enclosingCandidate = enclosingInfo.getEnclosingClass();

// be very careful not to change the stack depth of this

// checkMemberAccess call for security reasons

// see java.lang.SecurityManager.checkMemberAccess

//

// Note that we need to do this on the enclosing class

enclosingCandidate.checkMemberAccess(Member.DECLARED,

Reflection.getCallerClass(), true);

/*

* 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: enclosingCandidate.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).