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/*
* Copyright (C) 2014 The Android Open Source Project
* Copyright (c) 1994, 2014, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.lang;
import dalvik.annotation.optimization.FastNative;
import java.io.InputStream;
import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.annotation.Inherited;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Objects;
import libcore.reflect.GenericSignatureParser;
import libcore.reflect.InternalNames;
import libcore.reflect.Types;
import libcore.util.BasicLruCache;
import libcore.util.CollectionUtils;
import libcore.util.EmptyArray;
import dalvik.system.ClassExt;
import sun.reflect.CallerSensitive;
import sun.reflect.Reflection;
/**
* 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.
*
* {@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.
*
*
The following example uses a {@code Class} object to print the
* class name of an object:
*
*
* void printClassName(Object obj) {
* System.out.println("The class of " + obj +
* " is " + obj.getClass().getName());
* }
*
*
* 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
* The Java™ Language Specification.
* For example:
*
*
* {@code System.out.println("The name of class Foo is: "+Foo.class.getName());}
*
*
* @param the type of the class modeled by this {@code Class}
* object. For example, the type of {@code String.class} is {@code
* Class}. 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 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 final int FINALIZABLE = 0x80000000;
/** defining class loader, or null for the "bootstrap" system loader. */
private transient ClassLoader classLoader;
/**
* For array classes, the component class object for instanceof/checkcast (for String[][][],
* this will be String[][]). null for non-array classes.
*/
private transient Class componentType;
/**
* DexCache of resolved constant pool entries. Will be null for certain runtime-generated classes
* e.g. arrays and primitive classes.
*/
private transient Object dexCache;
/**
* Extra data that only some classes possess. This is allocated lazily as needed.
*/
private transient ClassExt extData;
/**
* The interface table (iftable_) contains pairs of a interface class and an array of the
* interface methods. There is one pair per interface supported by this class. That
* means one pair for each interface we support directly, indirectly via superclass, or
* indirectly via a superinterface. This will be null if neither we nor our superclass
* implement any interfaces.
*
* Why we need this: given "class Foo implements Face", declare "Face faceObj = new Foo()".
* Invoke faceObj.blah(), where "blah" is part of the Face interface. We can't easily use a
* single vtable.
*
* For every interface a concrete class implements, we create an array of the concrete vtable_
* methods for the methods in the interface.
*/
private transient Object[] ifTable;
/** Lazily computed name of this class; always prefer calling getName(). */
private transient String name;
/** The superclass, or null if this is java.lang.Object, an interface or primitive type. */
private transient Class superClass;
/**
* Virtual method table (vtable), for use by "invoke-virtual". The vtable from the superclass
* is copied in, and virtual methods from our class either replace those from the super or are
* appended. For abstract classes, methods may be created in the vtable that aren't in
* virtual_ methods_ for miranda methods.
*/
private transient Object vtable;
/**
* Instance fields. These describe the layout of the contents of an Object. Note that only the
* fields directly declared by this class are listed in iFields; fields declared by a
* superclass are listed in the superclass's Class.iFields.
*
* All instance fields that refer to objects are guaranteed to be at the beginning of the field
* list. {@link Class#numReferenceInstanceFields} specifies the number of reference fields.
*/
private transient long iFields;
/** All methods with this class as the base for virtual dispatch. */
private transient long methods;
/** Static fields */
private transient long sFields;
/** access flags; low 16 bits are defined by VM spec */
private transient int accessFlags;
/** Class flags to help the GC with object scanning. */
private transient int classFlags;
/**
* Total size of the Class instance; used when allocating storage on GC heap.
* See also {@link Class#objectSize}.
*/
private transient int classSize;
/**
* tid used to check for recursive static initializer invocation.
*/
private transient int clinitThreadId;
/**
* Class def index from dex file. An index of 65535 indicates that there is no class definition,
* for example for an array type.
* TODO: really 16bits as type indices are 16bit.
*/
private transient int dexClassDefIndex;
/**
* Class type index from dex file, lazily computed. An index of 65535 indicates that the type
* index isn't known. Volatile to avoid double-checked locking bugs.
* TODO: really 16bits as type indices are 16bit.
*/
private transient volatile int dexTypeIndex;
/** Number of instance fields that are object references. */
private transient int numReferenceInstanceFields;
/** Number of static fields that are object references. */
private transient int numReferenceStaticFields;
/**
* Total object size; used when allocating storage on GC heap. For interfaces and abstract
* classes this will be zero. See also {@link Class#classSize}.
*/
private transient int objectSize;
/**
* Aligned object size for allocation fast path. The value is max int if the object is
* uninitialized or finalizable, otherwise the aligned object size.
*/
private transient int objectSizeAllocFastPath;
/**
* The lower 16 bits is the primitive type value, or 0 if not a primitive type; set for
* generated primitive classes.
*/
private transient int primitiveType;
/** Bitmap of offsets of iFields. */
private transient int referenceInstanceOffsets;
/** State of class initialization */
private transient int status;
/** Offset of the first virtual method copied from an interface in the methods array. */
private transient short copiedMethodsOffset;
/** Offset of the first virtual method defined in this class in the methods array. */
private transient short virtualMethodsOffset;
/*
* Private constructor. Only the Java Virtual Machine creates Class objects.
* This constructor is not used and prevents the default constructor being
* generated.
*/
private Class() {}
/**
* Converts the object to a string. The string representation is the
* string "class" or "interface", followed by a space, and then by the
* fully qualified name of the class in the format returned by
* {@code getName}. If this {@code Class} object represents a
* primitive type, this method returns the name of the primitive type. If
* this {@code Class} object represents void this method returns
* "void".
*
* @return a string representation of this class object.
*/
public String toString() {
return (isInterface() ? "interface " : (isPrimitive() ? "" : "class "))
+ getName();
}
/**
* Returns 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 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.
*
* 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:
*
*
* {@code Class.forName(className, true, currentLoader)}
*
*
* where {@code currentLoader} denotes the defining class loader of
* the current class.
*
* For example, the following code fragment returns the
* runtime {@code Class} descriptor for the class named
* {@code java.lang.Thread}:
*
*
* {@code Class t = Class.forName("java.lang.Thread")}
*
*
* 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 forName(className, true, ClassLoader.getClassLoader(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.
*
*
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.
*
*
If {@code name} denotes an array class, the component type of
* the array class is loaded but not initialized.
*
*
For example, in an instance method the expression:
*
*
* {@code Class.forName("Foo")}
*
*
* is equivalent to:
*
*
* {@code Class.forName("Foo", true, this.getClass().getClassLoader())}
*
*
* Note that this method throws errors related to loading, linking or
* initializing as specified in Sections 12.2, 12.3 and 12.4 of The
* Java Language Specification.
* Note that this method does not check whether the requested class
* is accessible to its caller.
*
* 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 The Java Language Specification.
* @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
{
if (loader == null) {
loader = BootClassLoader.getInstance();
}
Class result;
try {
result = classForName(name, initialize, loader);
} catch (ClassNotFoundException e) {
Throwable cause = e.getCause();
if (cause instanceof LinkageError) {
throw (LinkageError) cause;
}
throw e;
}
return result;
}
/** Called after security checks have been made. */
@FastNative
static native Class classForName(String className, boolean shouldInitialize,
ClassLoader classLoader) 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.
*
*
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, s, 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.
*/
@FastNative
public native T newInstance() throws InstantiationException, IllegalAccessException;
/**
* 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.
*
*
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 boolean isInstance(Object obj) {
if (obj == null) {
return false;
}
return isAssignableFrom(obj.getClass());
}
/**
* 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}.
*
*
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 The Java Language
* Specification, 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 boolean isAssignableFrom(Class cls) {
if (this == cls) {
return true; // Can always assign to things of the same type.
} else if (this == Object.class) {
return !cls.isPrimitive(); // Can assign any reference to java.lang.Object.
} else if (isArray()) {
return cls.isArray() && componentType.isAssignableFrom(cls.componentType);
} else if (isInterface()) {
// Search iftable which has a flattened and uniqued list of interfaces.
Object[] iftable = cls.ifTable;
if (iftable != null) {
for (int i = 0; i < iftable.length; i += 2) {
if (iftable[i] == this) {
return true;
}
}
}
return false;
} else {
if (!cls.isInterface()) {
for (cls = cls.superClass; cls != null; cls = cls.superClass) {
if (cls == this) {
return true;
}
}
}
return false;
}
}
/**
* Determines if the specified {@code Class} object represents an
* interface type.
*
* @return {@code true} if this object represents an interface;
* {@code false} otherwise.
*/
public boolean isInterface() {
return (accessFlags & Modifier.INTERFACE) != 0;
}
/**
* 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 boolean isArray() {
return getComponentType() != null;
}
/**
* Determines if the specified {@code Class} object represents a
* primitive type.
*
*
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}.
*
*
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 boolean isPrimitive() {
return (primitiveType & 0xFFFF) != 0;
}
/**
* Indicates whether this {@code Class} or its parents override finalize.
*
* @return {@code true} if and if this class or its parents override
* finalize;
*
* @hide
*/
public boolean isFinalizable() {
return (getModifiers() & FINALIZABLE) != 0;
}
/**
* 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}.
*
*
If this class object represents a reference type that is not an
* array type then the binary name of the class is returned, as specified
* by
* The Java™ Language Specification.
*
*
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.
*
*
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:
*
*
* Element Type Encoding
* boolean Z
* byte B
* char C
* class or interface
* Lclassname;
* double D
* float F
* int I
* long J
* short S
*
*
* The class or interface name classname is the binary name of
* the class specified above.
*
*
Examples:
*
* 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"
*
*
* @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 = getNameNative();
return name;
}
@FastNative
private native String getNameNative();
/**
* 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.
*
* 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.
*
*
If this object
* represents a primitive type or void, null is returned.
*
* @return the class loader that loaded the class or interface
* represented by this object.
* @throws SecurityException
* if a security manager exists and its
* {@code checkPermission} method denies
* access to the class loader for the class.
* @see java.lang.ClassLoader
* @see SecurityManager#checkPermission
* @see java.lang.RuntimePermission
*/
public ClassLoader getClassLoader() {
if (isPrimitive()) {
return null;
}
// Android-note: The RI returns null in the case where Android returns BootClassLoader.
// Noted in http://b/111850480#comment3
return (classLoader == null) ? BootClassLoader.getInstance() : 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
* The Java™ Virtual Machine Specification
* @since 1.5
*/
@Override
public synchronized TypeVariable>[] getTypeParameters() {
String annotationSignature = getSignatureAttribute();
if (annotationSignature == null) {
return EmptyArray.TYPE_VARIABLE;
}
GenericSignatureParser parser = new GenericSignatureParser(getClassLoader());
parser.parseForClass(this, annotationSignature);
return parser.formalTypeParameters;
}
/**
* 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 Class getSuperclass() {
// For interfaces superClass is Object (which agrees with the JNI spec)
// but not with the expected behavior here.
if (isInterface()) {
return null;
} else {
return superClass;
}
}
/**
* Returns the {@code Type} representing the direct superclass of
* the entity (class, interface, primitive type or void) represented by
* this {@code Class}.
*
* 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
* The Java™ Virtual Machine Specification
* @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() {
Type genericSuperclass = getSuperclass();
// This method is specified to return null for all cases where getSuperclass
// returns null, i.e, for primitives, interfaces, void and java.lang.Object.
if (genericSuperclass == null) {
return null;
}
String annotationSignature = getSignatureAttribute();
if (annotationSignature != null) {
GenericSignatureParser parser = new GenericSignatureParser(getClassLoader());
parser.parseForClass(this, annotationSignature);
genericSuperclass = parser.superclassType;
}
return Types.getType(genericSuperclass);
}
/**
* 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.
*
*
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() {
ClassLoader loader = getClassLoader();
if (loader != null) {
String packageName = getPackageName();
return packageName != null ? loader.getPackage(packageName) : null;
}
return null;
}
/**
* Returns the fully qualified package name.
*
*
If this class is a top level class, then this method returns the fully
* qualified name of the package that the class is a member of, or the
* empty string if the class is in an unnamed package.
*
*
If this class is a member class, then this method is equivalent to
* invoking {@code getPackageName()} on the {@linkplain #getEnclosingClass
* enclosing class}.
*
*
If this class is a {@linkplain #isLocalClass local class} or an {@linkplain
* #isAnonymousClass() anonymous class}, then this method is equivalent to
* invoking {@code getPackageName()} on the {@linkplain #getDeclaringClass
* declaring class} of the {@linkplain #getEnclosingMethod enclosing method} or
* {@linkplain #getEnclosingConstructor enclosing constructor}.
*
*
If this class represents an array type then this method returns the
* package name of the element type. If this class represents a primitive
* type or void then the package name "{@code java.lang}" is returned.
*
* @return the fully qualified package name
*
* @since 9
* @spec JPMS
* @jls 6.7 Fully Qualified Names
*/
public String getPackageName() {
// BEGIN Android-changed: Don't use a private field as a cache.
Class c = this;
while (c.isArray()) {
c = c.getComponentType();
}
if (c.isPrimitive()) {
return "java.lang";
} else {
String cn = c.getName();
int dot = cn.lastIndexOf('.');
return (dot != -1) ? cn.substring(0, dot).intern() : "";
}
// END Android-changed: Don't use a private field as a cache.
}
/**
* Determines the interfaces implemented by the class or interface
* represented by this object.
*
*
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:
*
* {@code class Shimmer implements FloorWax, DessertTopping { ... }}
*
* suppose the value of {@code s} is an instance of
* {@code Shimmer}; the value of the expression:
*
* {@code s.getClass().getInterfaces()[0]}
*
* is the {@code Class} object that represents interface
* {@code FloorWax}; and the value of:
*
* {@code s.getClass().getInterfaces()[1]}
*
* is the {@code Class} object that represents interface
* {@code DessertTopping}.
*
* 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.
*
*
If this object represents a class or interface that implements no
* interfaces, the method returns an array of length 0.
*
*
If this object represents a primitive type or void, the method
* returns an array of length 0.
*
*
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() {
if (isArray()) {
return new Class[] { Cloneable.class, Serializable.class };
}
final Class[] ifaces = getInterfacesInternal();
if (ifaces == null) {
return EmptyArray.CLASS;
}
return ifaces;
}
@FastNative
private native Class[] getInterfacesInternal();
/**
* Returns the {@code Type}s representing the interfaces
* directly implemented by the class or interface represented by
* this object.
*
*
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.
*
*
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.
*
*
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.
*
*
If this object represents a class or interface that
* implements no interfaces, the method returns an array of length
* 0.
*
*
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
* The Java™ Virtual Machine Specification
* @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() {
Type[] result;
synchronized (Caches.genericInterfaces) {
result = Caches.genericInterfaces.get(this);
if (result == null) {
String annotationSignature = getSignatureAttribute();
if (annotationSignature == null) {
result = getInterfaces();
} else {
GenericSignatureParser parser = new GenericSignatureParser(getClassLoader());
parser.parseForClass(this, annotationSignature);
result = Types.getTypeArray(parser.interfaceTypes, false);
}
Caches.genericInterfaces.put(this, result);
}
}
return (result.length == 0) ? result : result.clone();
}
/**
* 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 Class getComponentType() {
return componentType;
}
/**
* 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}.
*
*
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.
*
*
The modifier encodings are defined in The Java Virtual Machine
* Specification, table 4.1.
*
* @return the {@code int} representing the modifiers for this class
* @see java.lang.reflect.Modifier
* @since JDK1.1
*/
public int getModifiers() {
// Array classes inherit modifiers from their component types, but in the case of arrays
// of an inner class, the class file may contain "fake" access flags because it's not valid
// for a top-level class to private, say. The real access flags are stored in the InnerClass
// attribute, so we need to make sure we drill down to the inner class: the accessFlags
// field is not the value we want to return, and the synthesized array class does not itself
// have an InnerClass attribute. https://code.google.com/p/android/issues/detail?id=56267
if (isArray()) {
int componentModifiers = getComponentType().getModifiers();
if ((componentModifiers & Modifier.INTERFACE) != 0) {
componentModifiers &= ~(Modifier.INTERFACE | Modifier.STATIC);
}
return Modifier.ABSTRACT | Modifier.FINAL | componentModifiers;
}
int JAVA_FLAGS_MASK = 0xffff;
int modifiers = this.getInnerClassFlags(accessFlags & JAVA_FLAGS_MASK);
return modifiers & JAVA_FLAGS_MASK;
}
/**
* 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 Object[] getSigners() {
return null;
}
@FastNative
private native Method getEnclosingMethodNative();
/**
* If this {@code Class} object represents a local or anonymous
* class within a method, returns a {@link
* java.lang.reflect.Method Method} object representing the
* immediately enclosing method of the underlying class. Returns
* {@code null} otherwise.
*
* In particular, this method returns {@code null} if the underlying
* class is a local or anonymous class immediately enclosed by a type
* declaration, instance initializer or static initializer.
*
* @return the immediately enclosing method of the underlying class, if
* that class is a local or anonymous class; otherwise {@code null}.
* @since 1.5
*/
// Android-changed: Removed SecurityException.
public Method getEnclosingMethod() {
if (classNameImpliesTopLevel()) {
return null;
}
return getEnclosingMethodNative();
}
/**
* If this {@code Class} object represents a local or anonymous
* class within a constructor, returns a {@link
* java.lang.reflect.Constructor Constructor} object representing
* the immediately enclosing constructor of the underlying
* class. Returns {@code null} otherwise. In particular, this
* method returns {@code null} if the underlying class is a local
* or anonymous class immediately enclosed by a type declaration,
* instance initializer or static initializer.
*
* @return the immediately enclosing constructor of the underlying class, if
* that class is a local or anonymous class; otherwise {@code null}.
* @since 1.5
*/
// Android-changed: Removed SecurityException.
public Constructor getEnclosingConstructor() {
if (classNameImpliesTopLevel()) {
return null;
}
return getEnclosingConstructorNative();
}
@FastNative
private native Constructor getEnclosingConstructorNative();
private boolean classNameImpliesTopLevel() {
return !getName().contains("$");
}
/**
* If the class or interface represented by this {@code Class} object
* is a member of another class, returns the {@code Class} object
* representing the class in which it was declared. This method returns
* null if this class or interface is not a member of any other class. If
* this {@code Class} object represents an array class, a primitive
* type, or void,then this method returns null.
*
* @return the declaring class for this class
* @since JDK1.1
*/
// Android-changed: Removed SecurityException.
@FastNative
public native Class getDeclaringClass();
/**
* Returns the immediately enclosing class of the underlying
* class. If the underlying class is a top level class this
* method returns {@code null}.
* @return the immediately enclosing class of the underlying class
* @since 1.5
*/
// Android-changed: Removed SecurityException.
@FastNative
public native Class getEnclosingClass();
/**
* Returns the simple name of the underlying class as given in the
* source code. Returns an empty string if the underlying class is
* anonymous.
*
*
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()+"[]";
if (isAnonymousClass()) {
return "";
}
if (isMemberClass() || isLocalClass()) {
// Note that we obtain this information from getInnerClassName(), which uses
// dex system annotations to obtain the name. It is possible for this information
// to disagree with the actual enclosing class name. For example, if dex
// manipulation tools have renamed the enclosing class without adjusting
// the system annotation to match. See http://b/28800927.
return getInnerClassName();
}
String simpleName = getName();
final int dot = simpleName.lastIndexOf(".");
if (dot > 0) {
return simpleName.substring(simpleName.lastIndexOf(".")+1); // strip the package name
}
return simpleName;
}
/**
* 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();
}
/**
* 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
*/
@FastNative
public native boolean isAnonymousClass();
/**
* 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 (getEnclosingMethod() != null || getEnclosingConstructor() != null)
&& !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 getDeclaringClass() != null;
}
/**
* 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 isLocalClass() || isAnonymousClass();
}
/**
* 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
*
* @since JDK1.1
*/
@CallerSensitive
public Class[] getClasses() {
List> result = new ArrayList>();
for (Class c = this; c != null; c = c.superClass) {
for (Class member : c.getDeclaredClasses()) {
if (Modifier.isPublic(member.getModifiers())) {
result.add(member);
}
}
}
return result.toArray(new Class[result.size()]);
}
/**
* Returns an array containing {@code Field} objects reflecting all
* the accessible public fields of the class or interface represented by
* this {@code Class} object.
*
* 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.
*
*
If this {@code Class} object represents a class, then this method
* returns the public fields of the class and of all its superclasses.
*
*
If this {@code Class} object represents an interface, then this
* method returns the fields of the interface and of all its
* superinterfaces.
*
*
If this {@code Class} object represents an array type, a primitive
* type, or void, then this method returns an array of length 0.
*
*
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, s, 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 {
List fields = new ArrayList();
getPublicFieldsRecursive(fields);
return fields.toArray(new Field[fields.size()]);
}
/**
* Populates {@code result} with public fields defined by this class, its
* superclasses, and all implemented interfaces.
*/
private void getPublicFieldsRecursive(List result) {
// search superclasses
for (Class c = this; c != null; c = c.superClass) {
Collections.addAll(result, c.getPublicDeclaredFields());
}
// search iftable which has a flattened and uniqued list of interfaces
Object[] iftable = ifTable;
if (iftable != null) {
for (int i = 0; i < iftable.length; i += 2) {
Collections.addAll(result, ((Class) iftable[i]).getPublicDeclaredFields());
}
}
}
/**
* 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.
*
* 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.
*
*
If this {@code Class} object represents a type with a class
* initialization method {@code }, then the returned array does
* not have a corresponding {@code Method} object.
*
* 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()}.
*
*
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}.)
*
*
If this {@code Class} object represents a primitive type or void,
* then the returned array has length 0.
*
*
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.
*
*
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, s, 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 {
List methods = new ArrayList();
getPublicMethodsInternal(methods);
/*
* Remove duplicate methods defined by superclasses and
* interfaces, preferring to keep methods declared by derived
* types.
*/
CollectionUtils.removeDuplicates(methods, Method.ORDER_BY_SIGNATURE);
return methods.toArray(new Method[methods.size()]);
}
/**
* Populates {@code result} with public methods defined by this class, its
* superclasses, and all implemented interfaces, including overridden methods.
*/
private void getPublicMethodsInternal(List result) {
Collections.addAll(result, getDeclaredMethodsUnchecked(true));
if (!isInterface()) {
// Search superclasses, for interfaces don't search java.lang.Object.
for (Class c = superClass; c != null; c = c.superClass) {
Collections.addAll(result, c.getDeclaredMethodsUnchecked(true));
}
}
// Search iftable which has a flattened and uniqued list of interfaces.
Object[] iftable = ifTable;
if (iftable != null) {
for (int i = 0; i < iftable.length; i += 2) {
Class ifc = (Class) iftable[i];
Collections.addAll(result, ifc.getDeclaredMethodsUnchecked(true));
}
}
}
/**
* 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} objects (that is an array of constructors from
* this class), the return type of this method is {@code
* Constructor[]} and not {@code Constructor[]} 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[]}.
*
* @return the array of {@code Constructor} objects representing the
* public constructors of this class
* @throws SecurityException
* If a security manager, s, 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 {
return getDeclaredConstructorsInternal(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.
*
* The field to be reflected is determined by the algorithm that
* follows. Let C be the class or interface represented by this object:
*
*
* - If C declares a public field with the name specified, that is the
* field to be reflected.
* - 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.
* - 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.
*
*
* 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, s, 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
*/
// Android-changed: Removed SecurityException.
public Field getField(String name)
throws NoSuchFieldException {
if (name == null) {
throw new NullPointerException("name == null");
}
Field result = getPublicFieldRecursive(name);
if (result == null) {
throw new NoSuchFieldException(name);
}
return result;
}
/**
* The native implementation of the {@code getField} method.
*
* @throws NullPointerException
* if name is null.
* @see #getField(String)
*/
@FastNative
private native Field getPublicFieldRecursive(String name);
/**
* 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.
*
*
If the {@code name} is "{@code }" or "{@code }" 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:
*
* - C is searched for a matching method, as defined below. If a
* matching method is found, it is reflected.
* - If no matching method is found by step 1 then:
*
* - If C is a class other than {@code Object}, then this algorithm is
* invoked recursively on the superclass of C.
* - 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.
*
*
*
* 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.
*
*
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.
*
*
If this {@code Class} object represents an array type, then this
* method does not find the {@code clone()} method.
*
*
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, s, 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 {
return getMethod(name, parameterTypes, true);
}
/**
* 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.
*
*
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, s, 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
*/
public Constructor getConstructor(Class... parameterTypes)
throws NoSuchMethodException, SecurityException {
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, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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
*/
// Android-changed: Removed SecurityException.
@FastNative
public native Class[] getDeclaredClasses();
/**
* 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.
*
* If this {@code Class} object represents a class or interface with no
* declared fields, then this method returns an array of length 0.
*
*
If this {@code Class} object represents an array type, a primitive
* type, or void, then this method returns an array of length 0.
*
*
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, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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
*/
// Android-changed: Removed SecurityException.
@FastNative
public native Field[] getDeclaredFields();
/**
* Populates a list of fields without performing any security or type
* resolution checks first. If no fields exist, the list is not modified.
*
* @param publicOnly Whether to return only public fields.
* @hide
*/
@FastNative
public native Field[] getDeclaredFieldsUnchecked(boolean publicOnly);
/**
*
* 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.
*
* 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.
*
*
If this {@code Class} object represents a type that has a class
* initialization method {@code }, then the returned array does
* not have a corresponding {@code Method} object.
*
* If this {@code Class} object represents a class or interface with no
* declared methods, then the returned array has length 0.
*
*
If this {@code Class} object represents an array type, a primitive
* type, or void, then the returned array has length 0.
*
*
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, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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
*/
public Method[] getDeclaredMethods() throws SecurityException {
Method[] result = getDeclaredMethodsUnchecked(false);
for (Method m : result) {
// Throw NoClassDefFoundError if types cannot be resolved.
m.getReturnType();
m.getParameterTypes();
}
return result;
}
/**
* Populates a list of methods without performing any security or type
* resolution checks first. If no methods exist, the list is not modified.
*
* @param publicOnly Whether to return only public methods.
* @hide
*/
@FastNative
public native Method[] getDeclaredMethodsUnchecked(boolean publicOnly);
/**
* 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.
*
* See The Java Language Specification, section 8.2.
*
* @return the array of {@code Constructor} objects representing all the
* declared constructors of this class
* @throws SecurityException
* If a security manager, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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
*/
public Constructor[] getDeclaredConstructors() throws SecurityException {
return getDeclaredConstructorsInternal(false);
}
/**
* Returns the constructor with the given parameters if it is defined by this class;
* {@code null} otherwise. This may return a non-public member.
*/
@FastNative
private native Constructor[] getDeclaredConstructorsInternal(boolean publicOnly);
/**
* 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.
*
* 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, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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
*/
// Android-changed: Removed SecurityException.
@FastNative
public native Field getDeclaredField(String name) throws NoSuchFieldException;
/**
* Returns the subset of getDeclaredFields which are public.
*/
@FastNative
private native Field[] getPublicDeclaredFields();
/**
* 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.
*
* 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, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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 getDeclaredMethod(String name, Class... parameterTypes)
throws NoSuchMethodException, SecurityException {
return getMethod(name, parameterTypes, false);
}
private Method getMethod(String name, Class[] parameterTypes, boolean recursivePublicMethods)
throws NoSuchMethodException {
if (name == null) {
throw new NullPointerException("name == null");
}
if (parameterTypes == null) {
parameterTypes = EmptyArray.CLASS;
}
for (Class c : parameterTypes) {
if (c == null) {
throw new NoSuchMethodException("parameter type is null");
}
}
Method result = recursivePublicMethods ? getPublicMethodRecursive(name, parameterTypes)
: getDeclaredMethodInternal(name, parameterTypes);
// Fail if we didn't find the method or it was expected to be public.
if (result == null ||
(recursivePublicMethods && !Modifier.isPublic(result.getAccessFlags()))) {
throw new NoSuchMethodException(getName() + "." + name + " "
+ Arrays.toString(parameterTypes));
}
return result;
}
private Method getPublicMethodRecursive(String name, Class[] parameterTypes) {
// search superclasses
for (Class c = this; c != null; c = c.getSuperclass()) {
Method result = c.getDeclaredMethodInternal(name, parameterTypes);
if (result != null && Modifier.isPublic(result.getAccessFlags())) {
return result;
}
}
return findInterfaceMethod(name, parameterTypes);
}
/**
* Returns an instance method that's defined on this class or any super classes, regardless
* of its access flags. Constructors are excluded.
*
* This function does not perform access checks and its semantics don't match any dex byte code
* instruction or public reflection API. This is used by {@code MethodHandles.findVirtual}
* which will perform access checks on the returned method.
*
* @hide
*/
public Method getInstanceMethod(String name, Class[] parameterTypes)
throws NoSuchMethodException, IllegalAccessException {
for (Class c = this; c != null; c = c.getSuperclass()) {
Method result = c.getDeclaredMethodInternal(name, parameterTypes);
if (result != null && !Modifier.isStatic(result.getModifiers())) {
return result;
}
}
return findInterfaceMethod(name, parameterTypes);
}
private Method findInterfaceMethod(String name, Class[] parameterTypes) {
Object[] iftable = ifTable;
if (iftable != null) {
// Search backwards so more specific interfaces are searched first. This ensures that
// the method we return is not overridden by one of it's subtypes that this class also
// implements.
for (int i = iftable.length - 2; i >= 0; i -= 2) {
Class ifc = (Class) iftable[i];
Method result = ifc.getPublicMethodRecursive(name, parameterTypes);
if (result != null && Modifier.isPublic(result.getAccessFlags())) {
return result;
}
}
}
return null;
}
/**
* 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, s, is present and any of the
* following conditions is met:
*
*
*
* - 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
*
*
- 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 getDeclaredConstructor(Class... parameterTypes)
throws NoSuchMethodException, SecurityException {
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}.
*
* Before delegation, an absolute resource name is constructed from the
* given resource name using this algorithm:
*
*
*
* - If the {@code name} begins with a {@code '/'}
* ('\u002f'), then the absolute name of the resource is the
* portion of the {@code name} following the {@code '/'}.
*
*
- Otherwise, the absolute name is of the following form:
*
*
* {@code modified_package_name/name}
*
*
* Where the {@code modified_package_name} is the package name of this
* object with {@code '/'} substituted for {@code '.'}
* ('\u002e').
*
*
*
* @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 = getClassLoader();
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}.
*
* Before delegation, an absolute resource name is constructed from the
* given resource name using this algorithm:
*
*
*
* - If the {@code name} begins with a {@code '/'}
* ('\u002f'), then the absolute name of the resource is the
* portion of the {@code name} following the {@code '/'}.
*
*
- Otherwise, the absolute name is of the following form:
*
*
* {@code modified_package_name/name}
*
*
* Where the {@code modified_package_name} is the package name of this
* object with {@code '/'} substituted for {@code '.'}
* ('\u002e').
*
*
*
* @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 = getClassLoader();
if (cl==null) {
// A system class.
return ClassLoader.getSystemResource(name);
}
return cl.getResource(name);
}
/**
* 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() {
return null;
}
/*
* Return the runtime's Class object for the named
* primitive type.
*/
@FastNative
static native Class getPrimitiveClass(String name);
/**
* 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;
}
private Constructor getConstructor0(Class[] parameterTypes,
int which) throws NoSuchMethodException
{
if (parameterTypes == null) {
parameterTypes = EmptyArray.CLASS;
}
for (Class c : parameterTypes) {
if (c == null) {
throw new NoSuchMethodException("parameter type is null");
}
}
Constructor result = getDeclaredConstructorInternal(parameterTypes);
if (result == null || which == Member.PUBLIC && !Modifier.isPublic(result.getAccessFlags())) {
throw new NoSuchMethodException(getName() + ". "
+ Arrays.toString(parameterTypes));
}
return result;
}
/** use serialVersionUID from JDK 1.1 for interoperability */
private static final long serialVersionUID = 3206093459760846163L;
/**
* Returns the constructor with the given parameters if it is defined by this class;
* {@code null} otherwise. This may return a non-public member.
*
* @param args the types of the parameters to the constructor.
*/
@FastNative
private native Constructor getDeclaredConstructorInternal(Class[] args);
/**
* 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.
*
* 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() {
return false;
}
/**
* Returns the simple name of a member or local class, or {@code null} otherwise.
*/
@FastNative
private native String getInnerClassName();
@FastNative
private native int getInnerClassFlags(int defaultValue);
/**
* 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;
}
/**
* 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;
}
// Android-changed: Made public/hidden instead of using sun.misc.SharedSecrets.
/**
* 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.
* @hide
*/
public T[] getEnumConstantsShared() {
if (!isEnum()) return null;
return (T[]) Enum.getSharedConstants((Class) this);
}
/**
* 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.
*
*
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 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 Class asSubclass(Class clazz) {
if (clazz.isAssignableFrom(this))
return (Class) this;
else
throw new ClassCastException(this.toString() +
" cannot be cast to " + clazz.getName());
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
@SuppressWarnings("unchecked")
public A getAnnotation(Class annotationClass) {
Objects.requireNonNull(annotationClass);
A annotation = getDeclaredAnnotation(annotationClass);
if (annotation != null) {
return annotation;
}
if (annotationClass.isDeclaredAnnotationPresent(Inherited.class)) {
for (Class sup = getSuperclass(); sup != null; sup = sup.getSuperclass()) {
annotation = sup.getDeclaredAnnotation(annotationClass);
if (annotation != null) {
return annotation;
}
}
}
return null;
}
/**
* {@inheritDoc}
* @throws NullPointerException {@inheritDoc}
* @since 1.5
*/
@Override
public boolean isAnnotationPresent(Class annotationClass) {
if (annotationClass == null) {
throw new NullPointerException("annotationClass == null");
}
if (isDeclaredAnnotationPresent(annotationClass)) {
return true;
}
if (annotationClass.isDeclaredAnnotationPresent(Inherited.class)) {
for (Class sup = getSuperclass(); sup != null; sup = sup.getSuperclass()) {
if (sup.isDeclaredAnnotationPresent(annotationClass)) {
return true;
}
}
}
return false;
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@Override
public A[] getAnnotationsByType(Class annotationClass) {
// Find any associated annotations [directly or repeatably (indirectly) present on this].
A[] annotations = GenericDeclaration.super.getAnnotationsByType(annotationClass);
if (annotations.length != 0) {
return annotations;
}
// Nothing was found, attempt looking for associated annotations recursively up to the root
// class if and only if:
// * The annotation class was marked with @Inherited.
//
// Inherited annotations are not coalesced into a single set: the first declaration found is
// returned.
if (annotationClass.isDeclaredAnnotationPresent(Inherited.class)) {
Class superClass = getSuperclass(); // Returns null if klass's base is Object.
if (superClass != null) {
return superClass.getAnnotationsByType(annotationClass);
}
}
// Annotated was not marked with @Inherited, or no superclass.
return (A[]) Array.newInstance(annotationClass, 0); // Safe by construction.
}
/**
* @since 1.5
*/
@Override
public Annotation[] getAnnotations() {
/*
* We need to get the annotations declared on this class, plus the
* annotations from superclasses that have the "@Inherited" annotation
* set. We create a temporary map to use while we accumulate the
* annotations and convert it to an array at the end.
*
* It's possible to have duplicates when annotations are inherited.
* We use a Map to filter those out.
*
* HashMap might be overkill here.
*/
HashMap, Annotation> map = new HashMap, Annotation>();
for (Annotation declaredAnnotation : getDeclaredAnnotations()) {
map.put(declaredAnnotation.annotationType(), declaredAnnotation);
}
for (Class sup = getSuperclass(); sup != null; sup = sup.getSuperclass()) {
for (Annotation declaredAnnotation : sup.getDeclaredAnnotations()) {
Class clazz = declaredAnnotation.annotationType();
if (!map.containsKey(clazz) && clazz.isDeclaredAnnotationPresent(Inherited.class)) {
map.put(clazz, declaredAnnotation);
}
}
}
/* Convert annotation values from HashMap to array. */
Collection coll = map.values();
return coll.toArray(new Annotation[coll.size()]);
}
/**
* @throws NullPointerException {@inheritDoc}
* @since 1.8
*/
@Override
@FastNative
public native A getDeclaredAnnotation(Class annotationClass);
/**
* @since 1.5
*/
@Override
@FastNative
public native Annotation[] getDeclaredAnnotations();
/**
* Returns true if the annotation exists.
*/
@FastNative
private native boolean isDeclaredAnnotationPresent(Class annotationClass);
private String getSignatureAttribute() {
String[] annotation = getSignatureAnnotation();
if (annotation == null) {
return null;
}
StringBuilder result = new StringBuilder();
for (String s : annotation) {
result.append(s);
}
return result.toString();
}
@FastNative
private native String[] getSignatureAnnotation();
/**
* Is this a runtime created proxy class?
*
* @hide
*/
public boolean isProxy() {
return (accessFlags & 0x00040000) != 0;
}
/**
* @hide
*/
public int getAccessFlags() {
return accessFlags;
}
/**
* Returns the method if it is defined by this class; {@code null} otherwise. This may return a
* non-public member.
*
* @param name the method name
* @param args the method's parameter types
*/
@FastNative
private native Method getDeclaredMethodInternal(String name, Class[] args);
private static class Caches {
/**
* Cache to avoid frequent recalculation of generic interfaces, which is generally uncommon.
* Sized sufficient to allow ConcurrentHashMapTest to run without recalculating its generic
* interfaces (required to avoid time outs). Validated by running reflection heavy code
* such as applications using Guice-like frameworks.
*/
private static final BasicLruCache genericInterfaces
= new BasicLruCache(8);
}
}