/*
* Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*
*
*
*
*
*
*
*
*
*
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*
*
*
*
*
*
*
*/
package java.lang;
import java.lang.reflect.
AnnotatedElement;
import java.lang.reflect.
Array;
import java.lang.reflect.
GenericArrayType;
import java.lang.reflect.
GenericDeclaration;
import java.lang.reflect.
Member;
import java.lang.reflect.
Field;
import java.lang.reflect.
Executable;
import java.lang.reflect.
Method;
import java.lang.reflect.
Constructor;
import java.lang.reflect.
Modifier;
import java.lang.reflect.
Type;
import java.lang.reflect.
TypeVariable;
import java.lang.reflect.
InvocationTargetException;
import java.lang.reflect.
AnnotatedType;
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.
LinkedHashMap;
import java.util.
List;
import java.util.
Set;
import java.util.
Map;
import java.util.
HashMap;
import java.util.
Objects;
import sun.misc.
Unsafe;
import sun.reflect.
CallerSensitive;
import sun.reflect.
ConstantPool;
import sun.reflect.
Reflection;
import sun.reflect.
ReflectionFactory;
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:
*
* <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™ Language Specification</cite>.
* For example:
*
* <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,
GenericDeclaration,
Type,
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 a string describing this {@code Class}, including
* information about modifiers and type parameters.
*
* The string is formatted as a list of type modifiers, if any,
* followed by the kind of type (empty string for primitive types
* and {@code class}, {@code enum}, {@code interface}, or
* <code>@</code>{@code interface}, as appropriate), followed
* by the type's name, followed by an angle-bracketed
* comma-separated list of the type's type parameters, if any.
*
* A space is used to separate modifiers from one another and to
* separate any modifiers from the kind of type. The modifiers
* occur in canonical order. If there are no type parameters, the
* type parameter list is elided.
*
* <p>Note that since information about the runtime representation
* of a type is being generated, modifiers not present on the
* originating source code or illegal on the originating source
* code may be present.
*
* @return a string describing this {@code Class}, including
* information about modifiers and type parameters
*
* @since 1.8
*/
public
String toGenericString() {
if (
isPrimitive()) {
return
toString();
} else {
StringBuilder sb = new
StringBuilder();
// Class modifiers are a superset of interface modifiers
int
modifiers =
getModifiers() &
Modifier.
classModifiers();
if (
modifiers != 0) {
sb.
append(
Modifier.
toString(
modifiers));
sb.
append(' ');
}
if (
isAnnotation()) {
sb.
append('@');
}
if (
isInterface()) { // Note: all annotation types are interfaces
sb.
append("interface");
} else {
if (
isEnum())
sb.
append("enum");
else
sb.
append("class");
}
sb.
append(' ');
sb.
append(
getName());
TypeVariable<?>[]
typeparms =
getTypeParameters();
if (
typeparms.length > 0) {
boolean
first = true;
sb.
append('<');
for(
TypeVariable<?>
typeparm:
typeparms) {
if (!
first)
sb.
append(',');
sb.
append(
typeparm.
getTypeName());
first = false;
}
sb.
append('>');
}
return
sb.
toString();
}
}
/**
* 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 if {@code true} the class will be initialized.
* See Section 12.4 of <em>The Java Language Specification</em>.
* @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 (sun.misc.
VM.
isSystemDomainLoader(
loader)) {
ClassLoader ccl =
ClassLoader.
getClassLoader(
caller);
if (!sun.misc.
VM.
isSystemDomainLoader(
ccl)) {
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.
* @throws IllegalAccessException if the class or its nullary
* constructor is not accessible.
* @throws 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.
* @throws ExceptionInInitializerError if the initialization
* provoked by this method fails.
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*/
@
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 (
InstantiationException)
new
InstantiationException(
getName()).
initCause(
e);
}
}
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.
* @jls 13.1 The Form of a Binary
* @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™ 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> <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() {
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™ Virtual Machine Specification</cite>
* @since 1.5
*/
@
SuppressWarnings("unchecked")
public
TypeVariable<
Class<T>>[]
getTypeParameters() {
ClassRepository info =
getGenericInfo();
if (
info != null)
return (
TypeVariable<
Class<T>>[])
info.
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™ 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() {
ClassRepository info =
getGenericInfo();
if (
info == null) {
return
getSuperclass();
}
// Historical irregularity:
// Generic signature marks interfaces with superclass = Object
// but this API returns null for interfaces
if (
isInterface()) {
return null;
}
return
info.
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.
*
* <p> If this {@code Class} object represents an array type, the
* interfaces {@code Cloneable} and {@code java.io.Serializable} are
* returned in that order.
*
* @return an array of interfaces implemented by this class.
*/
public
Class<?>[]
getInterfaces() {
ReflectionData<T>
rd =
reflectionData();
if (
rd == null) {
// no cloning required
return
getInterfaces0();
} else {
Class<?>[]
interfaces =
rd.
interfaces;
if (
interfaces == null) {
interfaces =
getInterfaces0();
rd.
interfaces =
interfaces;
}
// defensively copy before handing over to user code
return
interfaces.
clone();
}
}
private native
Class<?>[]
getInterfaces0();
/**
* 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™ 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() {
ClassRepository info =
getGenericInfo();
return (
info == null) ?
getInterfaces() :
info.
getSuperInterfaces();
}
/**
* 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}.
*
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of the enclosing class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* denies access to the methods within the enclosing class
*
* <li> the caller's class loader is not the same as or an
* ancestor of the class loader for the enclosing class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of the enclosing class
*
* </ul>
* @since 1.5
*/
@
CallerSensitive
public
Method getEnclosingMethod() throws
SecurityException {
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();
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).
descriptor = (
String)
enclosingInfo[2];
assert((
name != null &&
descriptor != null) ||
name ==
descriptor);
} catch (
ClassCastException cce) {
throw new
InternalError("Invalid type in enclosing method information",
cce);
}
}
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}.
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of the enclosing class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* denies access to the constructors within the enclosing class
*
* <li> the caller's class loader is not the same as or an
* ancestor of the class loader for the enclosing class and
* invocation of {@link SecurityManager#checkPackageAccess
* s.checkPackageAccess()} denies access to the package
* of the enclosing class
*
* </ul>
* @since 1.5
*/
@
CallerSensitive
public
Constructor<?>
getEnclosingConstructor() throws
SecurityException {
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]);
// Perform access check
Class<?>
enclosingCandidate =
enclosingInfo.
getEnclosingClass();
enclosingCandidate.
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
/*
* Loop over all declared constructors; match number
* of and type of parameters.
*/
for(
Constructor<?>
c:
enclosingCandidate.
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
* @throws SecurityException
* If a security manager, <i>s</i>, is present and the caller's
* class loader is not the same as or an ancestor of the class
* loader for the declaring class and invocation of {@link
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
* denies access to the package of the declaring class
* @since JDK1.1
*/
@
CallerSensitive
public
Class<?>
getDeclaringClass() throws
SecurityException {
final
Class<?>
candidate =
getDeclaringClass0();
if (
candidate != null)
candidate.
checkPackageAccess(
ClassLoader.
getClassLoader(
Reflection.
getCallerClass()), true);
return
candidate;
}
private native
Class<?>
getDeclaringClass0();
/**
* 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
* @exception SecurityException
* If a security manager, <i>s</i>, is present and the caller's
* class loader is not the same as or an ancestor of the class
* loader for the enclosing class and invocation of {@link
* SecurityManager#checkPackageAccess s.checkPackageAccess()}
* denies access to the package of the enclosing class
* @since 1.5
*/
@
CallerSensitive
public
Class<?>
getEnclosingClass() throws
SecurityException {
// 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();
Class<?>
enclosingCandidate;
if (
enclosingInfo == null) {
// This is a top level or a nested class or an inner class (a, b, or c)
enclosingCandidate =
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
enclosingCandidate =
enclosingClass;
}
if (
enclosingCandidate != null)
enclosingCandidate.
checkPackageAccess(
ClassLoader.
getClassLoader(
Reflection.
getCallerClass()), true);
return
enclosingCandidate;
}
/**
* 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);
}
/**
* Return an informative string for the name of this type.
*
* @return an informative string for the name of this type
* @since 1.8
*/
public
String getTypeName() {
if (
isArray()) {
try {
Class<?>
cl = this;
int
dimensions = 0;
while (
cl.
isArray()) {
dimensions++;
cl =
cl.
getComponentType();
}
StringBuilder sb = new
StringBuilder();
sb.
append(
cl.
getName());
for (int
i = 0;
i <
dimensions;
i++) {
sb.
append("[]");
}
return
sb.
toString();
} catch (
Throwable e) { /*FALLTHRU*/ }
}
return
getName();
}
/**
* 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",
ex);
}
}
/**
* 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
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @since JDK1.1
*/
@
CallerSensitive
public
Class<?>[]
getClasses() {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), false);
// 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.
return java.security.
AccessController.
doPrivileged(
new java.security.
PrivilegedAction<
Class<?>[]>() {
public
Class<?>[]
run() {
List<
Class<?>>
list = new
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();
}
return
list.
toArray(new
Class<?>[0]);
}
});
}
/**
* Returns an array containing {@code Field} objects reflecting all
* the accessible public fields of the class or interface represented by
* this {@code Class} object.
*
* <p> If this {@code Class} object represents a class or interface with no
* no accessible public fields, then this method returns an array of length
* 0.
*
* <p> If this {@code Class} object represents a class, then this method
* returns the public fields of the class and of all its superclasses.
*
* <p> If this {@code Class} object represents an interface, then this
* method returns the fields of the interface and of all its
* superinterfaces.
*
* <p> If this {@code Class} object represents an array type, a primitive
* type, or void, then this method returns an array of length 0.
*
* <p> The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Field} objects representing the
* public fields
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @since JDK1.1
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@
CallerSensitive
public
Field[]
getFields() throws
SecurityException {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), true);
return
copyFields(
privateGetPublicFields(null));
}
/**
* Returns an array containing {@code Method} objects reflecting all the
* public 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.
*
* <p> If this {@code Class} object represents a type that has multiple
* public methods with the same name and parameter types, but different
* return types, then the returned array has a {@code Method} object for
* each such method.
*
* <p> If this {@code Class} object represents a type with a class
* initialization method {@code <clinit>}, then the returned array does
* <em>not</em> have a corresponding {@code Method} object.
*
* <p> If this {@code Class} object represents an array type, then the
* returned array has a {@code Method} object for each of the public
* methods inherited by the array type from {@code Object}. It does not
* contain a {@code Method} object for {@code clone()}.
*
* <p> If this {@code Class} object represents an interface then the
* returned array does not contain any implicitly declared methods from
* {@code Object}. Therefore, if no methods are explicitly declared in
* this interface or any of its superinterfaces then the returned array
* has length 0. (Note that a {@code Class} object which represents a class
* always has public methods, inherited from {@code Object}.)
*
* <p> If this {@code Class} object represents a primitive type or void,
* then the returned array has length 0.
*
* <p> Static methods declared in superinterfaces of the class or interface
* represented by this {@code Class} object are not considered members of
* the class or interface.
*
* <p> The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Method} objects representing the
* public methods of this class
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since JDK1.1
*/
@
CallerSensitive
public
Method[]
getMethods() throws
SecurityException {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), true);
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
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @since JDK1.1
*/
@
CallerSensitive
public
Constructor<?>[]
getConstructors() throws
SecurityException {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), true);
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 or interface 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> If this {@code Class} object represents an array type, then this
* method does not find the {@code length} field of the array type.
*
* @param name the field name
* @return the {@code Field} object of this class specified by
* {@code name}
* @throws NoSuchFieldException if a field with the specified name is
* not found.
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @since JDK1.1
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@
CallerSensitive
public
Field getField(
String name)
throws
NoSuchFieldException,
SecurityException {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), true);
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 or interface represented by this object:
* <OL>
* <LI> C is searched for a <I>matching method</I>, as defined below. If a
* matching method is found, it is reflected.</LI>
* <LI> If no matching method is found by step 1 then:
* <OL TYPE="a">
* <LI> If C is a class other than {@code Object}, then this algorithm is
* invoked recursively on the superclass of C.</LI>
* <LI> If C is the class {@code Object}, or if C is an interface, then
* the superinterfaces of C (if any) are searched for a matching
* method. If any such method is found, it is reflected.</LI>
* </OL></LI>
* </OL>
*
* <p> To find a matching method in a class or interface 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> If this {@code Class} object represents an array type, then this
* method does not find the {@code clone()} method.
*
* <p> Static methods declared in superinterfaces of the class or interface
* represented by this {@code Class} object are not considered members of
* the class or interface.
*
* @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}
* @throws NoSuchMethodException if a matching method is not found
* or if the name is "<init>"or "<clinit>".
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since JDK1.1
*/
@
CallerSensitive
public
Method getMethod(
String name,
Class<?>...
parameterTypes)
throws
NoSuchMethodException,
SecurityException {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), true);
Method method =
getMethod0(
name,
parameterTypes, true);
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}
* @throws NoSuchMethodException if a matching method is not found.
* @throws SecurityException
* If a security manager, <i>s</i>, is present and
* 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.
*
* @since JDK1.1
*/
@
CallerSensitive
public
Constructor<T>
getConstructor(
Class<?>...
parameterTypes)
throws
NoSuchMethodException,
SecurityException {
checkMemberAccess(
Member.
PUBLIC,
Reflection.
getCallerClass(), true);
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
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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
*/
@
CallerSensitive
public
Class<?>[]
getDeclaredClasses() throws
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), false);
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.
*
* <p> If this {@code Class} object represents a class or interface with no
* declared fields, then this method returns an array of length 0.
*
* <p> If this {@code Class} object represents an array type, a primitive
* type, or void, then this method returns an array of length 0.
*
* <p> The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Field} objects representing all the
* declared fields of this class
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@
CallerSensitive
public
Field[]
getDeclaredFields() throws
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
return
copyFields(
privateGetDeclaredFields(false));
}
/**
*
* Returns an array containing {@code Method} objects reflecting all the
* declared methods of the class or interface represented by this {@code
* Class} object, including public, protected, default (package)
* access, and private methods, but excluding inherited methods.
*
* <p> If this {@code Class} object represents a type that has multiple
* declared methods with the same name and parameter types, but different
* return types, then the returned array has a {@code Method} object for
* each such method.
*
* <p> If this {@code Class} object represents a type that has a class
* initialization method {@code <clinit>}, then the returned array does
* <em>not</em> have a corresponding {@code Method} object.
*
* <p> If this {@code Class} object represents a class or interface with no
* declared methods, then the returned array has length 0.
*
* <p> If this {@code Class} object represents an array type, a primitive
* type, or void, then the returned array has length 0.
*
* <p> The elements in the returned array are not sorted and are not in any
* particular order.
*
* @return the array of {@code Method} objects representing all the
* declared methods of this class
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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>
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since JDK1.1
*/
@
CallerSensitive
public
Method[]
getDeclaredMethods() throws
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
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
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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
*/
@
CallerSensitive
public
Constructor<?>[]
getDeclaredConstructors() throws
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
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.
*
* <p> If this {@code Class} object represents an array type, then this
* method does not find the {@code length} field of the array type.
*
* @param name the name of the field
* @return the {@code Field} object for the specified field in this
* class
* @throws NoSuchFieldException if a field with the specified name is
* not found.
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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
* @jls 8.2 Class Members
* @jls 8.3 Field Declarations
*/
@
CallerSensitive
public
Field getDeclaredField(
String name)
throws
NoSuchFieldException,
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
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.
*
* <p> If this {@code Class} object represents an array type, then this
* method does not find the {@code clone()} method.
*
* @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
* @throws NoSuchMethodException if a matching method is not found.
* @throws NullPointerException if {@code name} is {@code null}
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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>
*
* @jls 8.2 Class Members
* @jls 8.4 Method Declarations
* @since JDK1.1
*/
@
CallerSensitive
public
Method getDeclaredMethod(
String name,
Class<?>...
parameterTypes)
throws
NoSuchMethodException,
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
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
* @throws NoSuchMethodException if a matching method is not found.
* @throws SecurityException
* If a security manager, <i>s</i>, is present and any of the
* following conditions is met:
*
* <ul>
*
* <li> the caller's class loader is not the same as the
* class loader of this class and invocation of
* {@link SecurityManager#checkPermission
* s.checkPermission} method with
* {@code RuntimePermission("accessDeclaredMembers")}
* 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
*/
@
CallerSensitive
public
Constructor<T>
getDeclaredConstructor(
Class<?>...
parameterTypes)
throws
NoSuchMethodException,
SecurityException {
checkMemberAccess(
Member.
DECLARED,
Reflection.
getCallerClass(), true);
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();
/*
* 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.
*
* This method also enforces package access.
*
* <p> Default policy: allow all clients access with normal Java access
* control.
*/
private void
checkMemberAccess(int
which,
Class<?>
caller, boolean
checkProxyInterfaces) {
final
SecurityManager s =
System.
getSecurityManager();
if (
s != null) {
/* Default policy allows access to all {@link Member#PUBLIC} members,
* as well as access to classes that have the same class loader as the caller.
* In all other cases, it requires RuntimePermission("accessDeclaredMembers")
* permission.
*/
final
ClassLoader ccl =
ClassLoader.
getClassLoader(
caller);
final
ClassLoader cl =
getClassLoader0();
if (
which !=
Member.
PUBLIC) {
if (
ccl !=
cl) {
s.
checkPermission(
SecurityConstants.
CHECK_MEMBER_ACCESS_PERMISSION);
}
}
this.
checkPackageAccess(
ccl,
checkProxyInterfaces);
}
}
/*
* Checks if a client loaded in ClassLoader ccl is allowed to access this
* class under the current package access policy. If access is denied,
* throw a SecurityException.
*/
private void
checkPackageAccess(final
ClassLoader ccl, boolean
checkProxyInterfaces) {
final
SecurityManager s =
System.
getSecurityManager();
if (
s != null) {
final
ClassLoader cl =
getClassLoader0();
if (
ReflectUtil.
needsPackageAccessCheck(
ccl,
cl)) {
String name = this.
getName();
int
i =
name.
lastIndexOf('.');
if (
i != -1) {
// skip the package access check on a proxy class in default proxy package
String pkg =
name.
substring(0,
i);
if (!
Proxy.
isProxyClass(this) ||
ReflectUtil.
isNonPublicProxyClass(this)) {
s.
checkPackageAccess(
pkg);
}
}
}
// check package access on the proxy interfaces
if (
checkProxyInterfaces &&
Proxy.
isProxyClass(this)) {
ReflectUtil.
checkProxyPackageAccess(
ccl, this.
getInterfaces());
}
}
}
/**
* 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;
}
/**
* Atomic operations support.
*/
private static class
Atomic {
// initialize Unsafe machinery here, since we need to call Class.class instance method
// and have to avoid calling it in the static initializer of the Class class...
private static final
Unsafe unsafe =
Unsafe.
getUnsafe();
// offset of Class.reflectionData instance field
private static final long
reflectionDataOffset;
// offset of Class.annotationType instance field
private static final long
annotationTypeOffset;
// offset of Class.annotationData instance field
private static final long
annotationDataOffset;
static {
Field[]
fields =
Class.class.
getDeclaredFields0(false); // bypass caches
reflectionDataOffset =
objectFieldOffset(
fields, "reflectionData");
annotationTypeOffset =
objectFieldOffset(
fields, "annotationType");
annotationDataOffset =
objectFieldOffset(
fields, "annotationData");
}
private static long
objectFieldOffset(
Field[]
fields,
String fieldName) {
Field field =
searchFields(
fields,
fieldName);
if (
field == null) {
throw new
Error("No " +
fieldName + " field found in java.lang.Class");
}
return
unsafe.
objectFieldOffset(
field);
}
static <T> boolean
casReflectionData(
Class<?>
clazz,
SoftReference<
ReflectionData<T>>
oldData,
SoftReference<
ReflectionData<T>>
newData) {
return
unsafe.
compareAndSwapObject(
clazz,
reflectionDataOffset,
oldData,
newData);
}
static <T> boolean
casAnnotationType(
Class<?>
clazz,
AnnotationType oldType,
AnnotationType newType) {
return
unsafe.
compareAndSwapObject(
clazz,
annotationTypeOffset,
oldType,
newType);
}
static <T> boolean
casAnnotationData(
Class<?>
clazz,
AnnotationData oldData,
AnnotationData newData) {
return
unsafe.
compareAndSwapObject(
clazz,
annotationDataOffset,
oldData,
newData);
}
}
/**
* Reflection support.
*/
// Caches for certain reflective results
private static boolean
useCaches = true;
// reflection data that might get invalidated when JVM TI RedefineClasses() is called
private static class
ReflectionData<T> {
volatile
Field[]
declaredFields;
volatile
Field[]
publicFields;
volatile
Method[]
declaredMethods;
volatile
Method[]
publicMethods;
volatile
Constructor<T>[]
declaredConstructors;
volatile
Constructor<T>[]
publicConstructors;
// Intermediate results for getFields and getMethods
volatile
Field[]
declaredPublicFields;
volatile
Method[]
declaredPublicMethods;
volatile
Class<?>[]
interfaces;
// Value of classRedefinedCount when we created this ReflectionData instance
final int
redefinedCount;
ReflectionData(int
redefinedCount) {
this.
redefinedCount =
redefinedCount;
}
}
private volatile transient
SoftReference<
ReflectionData<T>>
reflectionData;
// Incremented by the VM on each call to JVM TI RedefineClasses()
// that redefines this class or a superclass.
private volatile transient int
classRedefinedCount = 0;
// Lazily create and cache ReflectionData
private
ReflectionData<T>
reflectionData() {
SoftReference<
ReflectionData<T>>
reflectionData = this.
reflectionData;
int
classRedefinedCount = this.
classRedefinedCount;
ReflectionData<T>
rd;
if (
useCaches &&
reflectionData != null &&
(
rd =
reflectionData.
get()) != null &&
rd.
redefinedCount ==
classRedefinedCount) {
return
rd;
}
// else no SoftReference or cleared SoftReference or stale ReflectionData
// -> create and replace new instance
return
newReflectionData(
reflectionData,
classRedefinedCount);
}
private
ReflectionData<T>
newReflectionData(
SoftReference<
ReflectionData<T>>
oldReflectionData,
int
classRedefinedCount) {
if (!
useCaches) return null;
while (true) {
ReflectionData<T>
rd = new
ReflectionData<>(
classRedefinedCount);
// try to CAS it...
if (
Atomic.
casReflectionData(this,
oldReflectionData, new
SoftReference<>(
rd))) {
return
rd;
}
// else retry
oldReflectionData = this.
reflectionData;
classRedefinedCount = this.
classRedefinedCount;
if (
oldReflectionData != null &&
(
rd =
oldReflectionData.
get()) != null &&
rd.
redefinedCount ==
classRedefinedCount) {
return
rd;
}
}
}
// Generic signature handling
private native
String getGenericSignature0();
// Generic info repository; lazily initialized
private volatile 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;
// generic info is lazily initialized
private
ClassRepository getGenericInfo() {
ClassRepository genericInfo = this.
genericInfo;
if (
genericInfo == null) {
String signature =
getGenericSignature0();
if (
signature == null) {
genericInfo =
ClassRepository.
NONE;
} else {
genericInfo =
ClassRepository.
make(
signature,
getFactory());
}
this.
genericInfo =
genericInfo;
}
return (
genericInfo !=
ClassRepository.
NONE) ?
genericInfo : null;
}
// Annotations handling
native byte[]
getRawAnnotations();
// Since 1.8
native byte[]
getRawTypeAnnotations();
static byte[]
getExecutableTypeAnnotationBytes(
Executable ex) {
return
getReflectionFactory().
getExecutableTypeAnnotationBytes(
ex);
}
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;
ReflectionData<T>
rd =
reflectionData();
if (
rd != null) {
res =
publicOnly ?
rd.
declaredPublicFields :
rd.
declaredFields;
if (
res != null) return
res;
}
// No cached value available; request value from VM
res =
Reflection.
filterFields(this,
getDeclaredFields0(
publicOnly));
if (
rd != null) {
if (
publicOnly) {
rd.
declaredPublicFields =
res;
} else {
rd.
declaredFields =
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<
Class<?>>
traversedInterfaces) {
checkInitted();
Field[]
res;
ReflectionData<T>
rd =
reflectionData();
if (
rd != null) {
res =
rd.
publicFields;
if (
res != null) return
res;
}
// No cached value available; compute value recursively.
// Traverse in correct order for getField().
List<
Field>
fields = new
ArrayList<>();
if (
traversedInterfaces == null) {
traversedInterfaces = new
HashSet<>();
}
// Local fields
Field[]
tmp =
privateGetDeclaredFields(true);
addAll(
fields,
tmp);
// Direct superinterfaces, recursively
for (
Class<?>
c :
getInterfaces()) {
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 (
rd != null) {
rd.
publicFields =
res;
}
return
res;
}
private static void
addAll(
Collection<
Field>
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<T>[]
privateGetDeclaredConstructors(boolean
publicOnly) {
checkInitted();
Constructor<T>[]
res;
ReflectionData<T>
rd =
reflectionData();
if (
rd != null) {
res =
publicOnly ?
rd.
publicConstructors :
rd.
declaredConstructors;
if (
res != null) return
res;
}
// No cached value available; request value from VM
if (
isInterface()) {
@
SuppressWarnings("unchecked")
Constructor<T>[]
temporaryRes = (
Constructor<T>[]) new
Constructor<?>[0];
res =
temporaryRes;
} else {
res =
getDeclaredConstructors0(
publicOnly);
}
if (
rd != null) {
if (
publicOnly) {
rd.
publicConstructors =
res;
} else {
rd.
declaredConstructors =
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;
ReflectionData<T>
rd =
reflectionData();
if (
rd != null) {
res =
publicOnly ?
rd.
declaredPublicMethods :
rd.
declaredMethods;
if (
res != null) return
res;
}
// No cached value available; request value from VM
res =
Reflection.
filterMethods(this,
getDeclaredMethods0(
publicOnly));
if (
rd != null) {
if (
publicOnly) {
rd.
declaredPublicMethods =
res;
} else {
rd.
declaredMethods =
res;
}
}
return
res;
}
static class
MethodArray {
// Don't add or remove methods except by add() or remove() calls.
private
Method[]
methods;
private int
length;
private int
defaults;
MethodArray() {
this(20);
}
MethodArray(int
initialSize) {
if (
initialSize < 2)
throw new
IllegalArgumentException("Size should be 2 or more");
methods = new
Method[
initialSize];
length = 0;
defaults = 0;
}
boolean
hasDefaults() {
return
defaults != 0;
}
void
add(
Method m) {
if (
length ==
methods.length) {
methods =
Arrays.
copyOf(
methods, 2 *
methods.length);
}
methods[
length++] =
m;
if (
m != null &&
m.
isDefault())
defaults++;
}
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);
}
}
}
/* Add Methods declared in an interface to this MethodArray.
* Static methods declared in interfaces are not inherited.
*/
void
addInterfaceMethods(
Method[]
methods) {
for (
Method candidate :
methods) {
if (!
Modifier.
isStatic(
candidate.
getModifiers())) {
add(
candidate);
}
}
}
int
length() {
return
length;
}
Method get(int
i) {
return
methods[
i];
}
Method getFirst() {
for (
Method m :
methods)
if (
m != null)
return
m;
return null;
}
void
removeByNameAndDescriptor(
Method toRemove) {
for (int
i = 0;
i <
length;
i++) {
Method m =
methods[
i];
if (
m != null &&
matchesNameAndDescriptor(
m,
toRemove)) {
remove(
i);
}
}
}
private void
remove(int
i) {
if (
methods[
i] != null &&
methods[
i].
isDefault())
defaults--;
methods[
i] = null;
}
private boolean
matchesNameAndDescriptor(
Method m1,
Method m2) {
return
m1.
getReturnType() ==
m2.
getReturnType() &&
m1.
getName() ==
m2.
getName() && // name is guaranteed to be interned
arrayContentsEq(
m1.
getParameterTypes(),
m2.
getParameterTypes());
}
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);
}
}
/* Removes all Methods from this MethodArray that have a more specific
* default Method in this MethodArray.
*
* Users of MethodArray are responsible for pruning Methods that have
* a more specific <em>concrete</em> Method.
*/
void
removeLessSpecifics() {
if (!
hasDefaults())
return;
for (int
i = 0;
i <
length;
i++) {
Method m =
get(
i);
if (
m == null || !
m.
isDefault())
continue;
for (int
j = 0;
j <
length;
j++) {
if (
i ==
j)
continue;
Method candidate =
get(
j);
if (
candidate == null)
continue;
if (!
matchesNameAndDescriptor(
m,
candidate))
continue;
if (
hasMoreSpecificClass(
m,
candidate))
remove(
j);
}
}
}
Method[]
getArray() {
return
methods;
}
// Returns true if m1 is more specific than m2
static boolean
hasMoreSpecificClass(
Method m1,
Method m2) {
Class<?>
m1Class =
m1.
getDeclaringClass();
Class<?>
m2Class =
m2.
getDeclaringClass();
return
m1Class !=
m2Class &&
m2Class.
isAssignableFrom(
m1Class);
}
}
// 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;
ReflectionData<T>
rd =
reflectionData();
if (
rd != null) {
res =
rd.
publicMethods;
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();
for (
Class<?>
i :
getInterfaces()) {
inheritedMethods.
addInterfaceMethods(
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()) &&
!
m.
isDefault()) {
inheritedMethods.
removeByNameAndDescriptor(
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.
removeByNameAndDescriptor(
m);
}
methods.
addAllIfNotPresent(
inheritedMethods);
methods.
removeLessSpecifics();
methods.
compactAndTrim();
res =
methods.
getArray();
if (
rd != null) {
rd.
publicMethods =
res;
}
return
res;
}
//
// Helpers for fetchers of one field, method, or constructor
//
private static
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;
// 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, boolean
includeStaticMethods) {
MethodArray interfaceCandidates = new
MethodArray(2);
Method res =
privateGetMethodRecursive(
name,
parameterTypes,
includeStaticMethods,
interfaceCandidates);
if (
res != null)
return
res;
// Not found on class or superclass directly
interfaceCandidates.
removeLessSpecifics();
return
interfaceCandidates.
getFirst(); // may be null
}
private
Method privateGetMethodRecursive(
String name,
Class<?>[]
parameterTypes,
boolean
includeStaticMethods,
MethodArray allInterfaceCandidates) {
// 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.
//
// Due to default methods, unless a method is found on a superclass,
// methods declared in any superinterface needs to be considered.
// Collect all candidates declared in superinterfaces in {@code
// allInterfaceCandidates} and select the most specific if no match on
// a superclass is found.
// Must _not_ return root methods
Method res;
// Search declared public methods
if ((
res =
searchMethods(
privateGetDeclaredMethods(true),
name,
parameterTypes)) != null) {
if (
includeStaticMethods || !
Modifier.
isStatic(
res.
getModifiers()))
return
res;
}
// Search superclass's methods
if (!
isInterface()) {
Class<? super T>
c =
getSuperclass();
if (
c != null) {
if ((
res =
c.
getMethod0(
name,
parameterTypes, true)) != null) {
return
res;
}
}
}
// Search superinterfaces' methods
Class<?>[]
interfaces =
getInterfaces();
for (
Class<?>
c :
interfaces)
if ((
res =
c.
getMethod0(
name,
parameterTypes, false)) != null)
allInterfaceCandidates.
add(
res);
// Not found
return null;
}
private
Constructor<T>
getConstructor0(
Class<?>[]
parameterTypes,
int
which) throws
NoSuchMethodException
{
Constructor<T>[]
constructors =
privateGetDeclaredConstructors((
which ==
Member.
PUBLIC));
for (
Constructor<T>
constructor :
constructors) {
if (
arrayContentsEq(
parameterTypes,
constructor.
getParameterTypes())) {
return
getReflectionFactory().
copyConstructor(
constructor);
}
}
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 <U>
Constructor<U>[]
copyConstructors(
Constructor<U>[]
arg) {
Constructor<U>[]
out =
arg.
clone();
ReflectionFactory fact =
getReflectionFactory();
for (int
i = 0;
i <
out.length;
i++) {
out[
i] =
fact.
copyConstructor(
out[
i]);
}
return
out;
}
private native
Field[]
getDeclaredFields0(boolean
publicOnly);
private native
Method[]
getDeclaredMethods0(boolean
publicOnly);
private native
Constructor<T>[]
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);
// If the classloader has been initialized with the assertion
// directives, ask it. Otherwise, ask the VM.
synchronized(
loader.
assertionLock) {
if (
loader.
classAssertionStatus != null) {
return
loader.
desiredAssertionStatus(
getName());
}
}
return
desiredAssertionStatus0(this);
}
// 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 =
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<
Void>() {
public
Void 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;
}
// Doesn't use Boolean.getBoolean to avoid class init.
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 getEnumConstants 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<
Void>() {
public
Void run() {
values.
setAccessible(true);
return null;
}
});
@
SuppressWarnings("unchecked")
T[]
temporaryConstants = (T[])
values.
invoke(null);
enumConstants =
temporaryConstants;
}
// These can happen when users concoct enum-like classes
// that don't comply with the enum spec.
catch (
InvocationTargetException |
NoSuchMethodException |
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
* {@code 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<>(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
*/
@
SuppressWarnings("unchecked")
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 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).
*
* @param <U> the type to cast this class object to
* @param clazz the class of the type to cast this class object to
* @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
*/
@
SuppressWarnings("unchecked")
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
*/
@
SuppressWarnings("unchecked")
public <A extends
Annotation> A
getAnnotation(
Class<A>
annotationClass) {
Objects.
requireNonNull(
annotationClass);
return (A)
annotationData().
annotations.
get(
annotationClass);
}
/**
* {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
@
Override
public boolean
isAnnotationPresent(
Class<? extends
Annotation>
annotationClass) {
return
GenericDeclaration.super.isAnnotationPresent(
annotationClass);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@
Override
public <A extends
Annotation> A[]
getAnnotationsByType(
Class<A>
annotationClass) {
Objects.
requireNonNull(
annotationClass);
AnnotationData annotationData =
annotationData();
return
AnnotationSupport.
getAssociatedAnnotations(
annotationData.
declaredAnnotations,
this,
annotationClass);
}
/**
* @since 1.5
*/
public
Annotation[]
getAnnotations() {
return
AnnotationParser.
toArray(
annotationData().
annotations);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@
Override
@
SuppressWarnings("unchecked")
public <A extends
Annotation> A
getDeclaredAnnotation(
Class<A>
annotationClass) {
Objects.
requireNonNull(
annotationClass);
return (A)
annotationData().
declaredAnnotations.
get(
annotationClass);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@
Override
public <A extends
Annotation> A[]
getDeclaredAnnotationsByType(
Class<A>
annotationClass) {
Objects.
requireNonNull(
annotationClass);
return
AnnotationSupport.
getDirectlyAndIndirectlyPresent(
annotationData().
declaredAnnotations,
annotationClass);
}
/**
* @since 1.5
*/
public
Annotation[]
getDeclaredAnnotations() {
return
AnnotationParser.
toArray(
annotationData().
declaredAnnotations);
}
// annotation data that might get invalidated when JVM TI RedefineClasses() is called
private static class
AnnotationData {
final
Map<
Class<? extends
Annotation>,
Annotation>
annotations;
final
Map<
Class<? extends
Annotation>,
Annotation>
declaredAnnotations;
// Value of classRedefinedCount when we created this AnnotationData instance
final int
redefinedCount;
AnnotationData(
Map<
Class<? extends
Annotation>,
Annotation>
annotations,
Map<
Class<? extends
Annotation>,
Annotation>
declaredAnnotations,
int
redefinedCount) {
this.
annotations =
annotations;
this.
declaredAnnotations =
declaredAnnotations;
this.
redefinedCount =
redefinedCount;
}
}
// Annotations cache
@
SuppressWarnings("UnusedDeclaration")
private volatile transient
AnnotationData annotationData;
private
AnnotationData annotationData() {
while (true) { // retry loop
AnnotationData annotationData = this.
annotationData;
int
classRedefinedCount = this.
classRedefinedCount;
if (
annotationData != null &&
annotationData.
redefinedCount ==
classRedefinedCount) {
return
annotationData;
}
// null or stale annotationData -> optimistically create new instance
AnnotationData newAnnotationData =
createAnnotationData(
classRedefinedCount);
// try to install it
if (
Atomic.
casAnnotationData(this,
annotationData,
newAnnotationData)) {
// successfully installed new AnnotationData
return
newAnnotationData;
}
}
}
private
AnnotationData createAnnotationData(int
classRedefinedCount) {
Map<
Class<? extends
Annotation>,
Annotation>
declaredAnnotations =
AnnotationParser.
parseAnnotations(
getRawAnnotations(),
getConstantPool(), this);
Class<?>
superClass =
getSuperclass();
Map<
Class<? extends
Annotation>,
Annotation>
annotations = null;
if (
superClass != null) {
Map<
Class<? extends
Annotation>,
Annotation>
superAnnotations =
superClass.
annotationData().
annotations;
for (
Map.
Entry<
Class<? extends
Annotation>,
Annotation>
e :
superAnnotations.
entrySet()) {
Class<? extends
Annotation>
annotationClass =
e.
getKey();
if (
AnnotationType.
getInstance(
annotationClass).
isInherited()) {
if (
annotations == null) { // lazy construction
annotations = new
LinkedHashMap<>((
Math.
max(
declaredAnnotations.
size(),
Math.
min(12,
declaredAnnotations.
size() +
superAnnotations.
size())
) * 4 + 2) / 3
);
}
annotations.
put(
annotationClass,
e.
getValue());
}
}
}
if (
annotations == null) {
// no inherited annotations -> share the Map with declaredAnnotations
annotations =
declaredAnnotations;
} else {
// at least one inherited annotation -> declared may override inherited
annotations.
putAll(
declaredAnnotations);
}
return new
AnnotationData(
annotations,
declaredAnnotations,
classRedefinedCount);
}
// Annotation types cache their internal (AnnotationType) form
@
SuppressWarnings("UnusedDeclaration")
private volatile transient
AnnotationType annotationType;
boolean
casAnnotationType(
AnnotationType oldType,
AnnotationType newType) {
return
Atomic.
casAnnotationType(this,
oldType,
newType);
}
AnnotationType getAnnotationType() {
return
annotationType;
}
Map<
Class<? extends
Annotation>,
Annotation>
getDeclaredAnnotationMap() {
return
annotationData().
declaredAnnotations;
}
/* Backing store of user-defined values pertaining to this class.
* Maintained by the ClassValue class.
*/
transient
ClassValue.
ClassValueMap classValueMap;
/**
* Returns an {@code AnnotatedType} object that represents the use of a
* type to specify the superclass of the entity represented by this {@code
* Class} object. (The <em>use</em> of type Foo to specify the superclass
* in '... extends Foo' is distinct from the <em>declaration</em> of type
* Foo.)
*
* <p> If this {@code Class} object represents a type whose declaration
* does not explicitly indicate an annotated superclass, then the return
* value is an {@code AnnotatedType} object representing an element with no
* annotations.
*
* <p> If this {@code Class} represents either the {@code Object} class, an
* interface type, an array type, a primitive type, or void, the return
* value is {@code null}.
*
* @return an object representing the superclass
* @since 1.8
*/
public
AnnotatedType getAnnotatedSuperclass() {
if (this ==
Object.class ||
isInterface() ||
isArray() ||
isPrimitive() ||
this ==
Void.
TYPE) {
return null;
}
return
TypeAnnotationParser.
buildAnnotatedSuperclass(
getRawTypeAnnotations(),
getConstantPool(), this);
}
/**
* Returns an array of {@code AnnotatedType} objects that represent the use
* of types to specify superinterfaces of the entity represented by this
* {@code Class} object. (The <em>use</em> of type Foo to specify a
* superinterface in '... implements Foo' is distinct from the
* <em>declaration</em> of type Foo.)
*
* <p> If this {@code Class} object represents a class, the return value is
* an array containing objects representing the uses of interface types to
* specify interfaces implemented by the class. The order of the objects in
* the array corresponds to the order of the interface types used in the
* 'implements' clause of the declaration of this {@code Class} object.
*
* <p> If this {@code Class} object represents an interface, the return
* value is an array containing objects representing the uses of interface
* types to specify interfaces directly extended by the interface. The
* order of the objects in the array corresponds to the order of the
* interface types used in the 'extends' clause of the declaration of this
* {@code Class} object.
*
* <p> If this {@code Class} object represents a class or interface whose
* declaration does not explicitly indicate any annotated superinterfaces,
* the return value is an array of length 0.
*
* <p> If this {@code Class} object represents either the {@code Object}
* class, an array type, a primitive type, or void, the return value is an
* array of length 0.
*
* @return an array representing the superinterfaces
* @since 1.8
*/
public
AnnotatedType[]
getAnnotatedInterfaces() {
return
TypeAnnotationParser.
buildAnnotatedInterfaces(
getRawTypeAnnotations(),
getConstantPool(), this);
}
}