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/*
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* Copyright (c) 1996, 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang.reflect;
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import sun.reflect.MethodAccessor;
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import sun.reflect.Reflection;
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import sun.reflect.generics.repository.MethodRepository;
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import sun.reflect.generics.factory.CoreReflectionFactory;
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import sun.reflect.generics.factory.GenericsFactory;
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import sun.reflect.generics.scope.MethodScope;
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import sun.reflect.annotation.AnnotationType;
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import sun.reflect.annotation.AnnotationParser;
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import java.lang.annotation.Annotation;
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import java.lang.annotation.AnnotationFormatError;
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import java.nio.ByteBuffer;
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import java.util.Map;
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/**
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* A {@code Method} provides information about, and access to, a single method
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* on a class or interface. The reflected method may be a class method
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* or an instance method (including an abstract method).
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*
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* <p>A {@code Method} permits widening conversions to occur when matching the
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* actual parameters to invoke with the underlying method's formal
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* parameters, but it throws an {@code IllegalArgumentException} if a
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* narrowing conversion would occur.
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*
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* @see Member
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* @see java.lang.Class
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* @see java.lang.Class#getMethods()
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* @see java.lang.Class#getMethod(String, Class[])
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* @see java.lang.Class#getDeclaredMethods()
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* @see java.lang.Class#getDeclaredMethod(String, Class[])
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*
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* @author Kenneth Russell
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* @author Nakul Saraiya
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*/
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public final
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class Method extends AccessibleObject implements GenericDeclaration,
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Member {
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private Class<?> clazz;
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private int slot;
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// This is guaranteed to be interned by the VM in the 1.4
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// reflection implementation
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private String name;
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private Class<?> returnType;
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private Class<?>[] parameterTypes;
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private Class<?>[] exceptionTypes;
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private int modifiers;
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// Generics and annotations support
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private transient String signature;
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// generic info repository; lazily initialized
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private transient MethodRepository genericInfo;
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private byte[] annotations;
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private byte[] parameterAnnotations;
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private byte[] annotationDefault;
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private volatile MethodAccessor methodAccessor;
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// For sharing of MethodAccessors. This branching structure is
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// currently only two levels deep (i.e., one root Method and
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// potentially many Method objects pointing to it.)
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private Method root;
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// Generics infrastructure
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private String getGenericSignature() {return signature;}
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// Accessor for factory
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private GenericsFactory getFactory() {
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// create scope and factory
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return CoreReflectionFactory.make(this, MethodScope.make(this));
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}
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// Accessor for generic info repository
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private MethodRepository getGenericInfo() {
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// lazily initialize repository if necessary
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if (genericInfo == null) {
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// create and cache generic info repository
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genericInfo = MethodRepository.make(getGenericSignature(),
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getFactory());
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}
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return genericInfo; //return cached repository
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}
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/**
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* Package-private constructor used by ReflectAccess to enable
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* instantiation of these objects in Java code from the java.lang
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* package via sun.reflect.LangReflectAccess.
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*/
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Method(Class<?> declaringClass,
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String name,
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Class<?>[] parameterTypes,
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Class<?> returnType,
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Class<?>[] checkedExceptions,
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int modifiers,
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int slot,
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String signature,
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byte[] annotations,
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byte[] parameterAnnotations,
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byte[] annotationDefault)
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{
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this.clazz = declaringClass;
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this.name = name;
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this.parameterTypes = parameterTypes;
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this.returnType = returnType;
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this.exceptionTypes = checkedExceptions;
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this.modifiers = modifiers;
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this.slot = slot;
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this.signature = signature;
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this.annotations = annotations;
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this.parameterAnnotations = parameterAnnotations;
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this.annotationDefault = annotationDefault;
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}
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/**
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* Package-private routine (exposed to java.lang.Class via
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* ReflectAccess) which returns a copy of this Method. The copy's
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* "root" field points to this Method.
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*/
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Method copy() {
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// This routine enables sharing of MethodAccessor objects
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// among Method objects which refer to the same underlying
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// method in the VM. (All of this contortion is only necessary
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// because of the "accessibility" bit in AccessibleObject,
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// which implicitly requires that new java.lang.reflect
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// objects be fabricated for each reflective call on Class
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// objects.)
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Method res = new Method(clazz, name, parameterTypes, returnType,
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exceptionTypes, modifiers, slot, signature,
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annotations, parameterAnnotations, annotationDefault);
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res.root = this;
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// Might as well eagerly propagate this if already present
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res.methodAccessor = methodAccessor;
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return res;
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}
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/**
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* Returns the {@code Class} object representing the class or interface
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* that declares the method represented by this {@code Method} object.
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*/
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public Class<?> getDeclaringClass() {
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return clazz;
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}
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/**
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* Returns the name of the method represented by this {@code Method}
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* object, as a {@code String}.
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*/
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public String getName() {
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return name;
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}
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/**
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* Returns the Java language modifiers for the method represented
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* by this {@code Method} object, as an integer. The {@code Modifier} class should
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* be used to decode the modifiers.
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*
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* @see Modifier
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*/
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public int getModifiers() {
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return modifiers;
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}
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/**
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* Returns an array of {@code TypeVariable} objects that represent the
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* type variables declared by the generic declaration represented by this
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* {@code GenericDeclaration} object, in declaration order. Returns an
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* array of length 0 if the underlying generic declaration declares no type
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* variables.
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*
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* @return an array of {@code TypeVariable} objects that represent
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* the type variables declared by this generic declaration
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* @throws GenericSignatureFormatError if the generic
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* signature of this generic declaration does not conform to
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* the format specified in
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* <cite>The Java™ Virtual Machine Specification</cite>
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* @since 1.5
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*/
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public TypeVariable<Method>[] getTypeParameters() {
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if (getGenericSignature() != null)
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return (TypeVariable<Method>[])getGenericInfo().getTypeParameters();
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else
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return (TypeVariable<Method>[])new TypeVariable[0];
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}
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/**
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* Returns a {@code Class} object that represents the formal return type
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* of the method represented by this {@code Method} object.
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*
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* @return the return type for the method this object represents
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*/
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public Class<?> getReturnType() {
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return returnType;
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}
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/**
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* Returns a {@code Type} object that represents the formal return
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* type of the method represented by this {@code Method} object.
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*
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* <p>If the return type is a parameterized type,
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* the {@code Type} object returned must accurately reflect
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* the actual type parameters used in the source code.
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*
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* <p>If the return type is a type variable or a parameterized type, it
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* is created. Otherwise, it is resolved.
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*
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* @return a {@code Type} object that represents the formal return
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* type of the underlying method
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* @throws GenericSignatureFormatError
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* if the generic method signature does not conform to the format
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* specified in
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* <cite>The Java™ Virtual Machine Specification</cite>
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* @throws TypeNotPresentException if the underlying method's
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* return type refers to a non-existent type declaration
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* @throws MalformedParameterizedTypeException if the
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* underlying method's return typed refers to a parameterized
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* type that cannot be instantiated for any reason
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* @since 1.5
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*/
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public Type getGenericReturnType() {
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if (getGenericSignature() != null) {
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return getGenericInfo().getReturnType();
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} else { return getReturnType();}
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}
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/**
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* Returns an array of {@code Class} objects that represent the formal
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* parameter types, in declaration order, of the method
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* represented by this {@code Method} object. Returns an array of length
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* 0 if the underlying method takes no parameters.
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*
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* @return the parameter types for the method this object
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* represents
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*/
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public Class<?>[] getParameterTypes() {
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return (Class<?>[]) parameterTypes.clone();
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}
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/**
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* Returns an array of {@code Type} objects that represent the formal
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* parameter types, in declaration order, of the method represented by
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* this {@code Method} object. Returns an array of length 0 if the
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* underlying method takes no parameters.
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*
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* <p>If a formal parameter type is a parameterized type,
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* the {@code Type} object returned for it must accurately reflect
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* the actual type parameters used in the source code.
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*
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* <p>If a formal parameter type is a type variable or a parameterized
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* type, it is created. Otherwise, it is resolved.
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*
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* @return an array of Types that represent the formal
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* parameter types of the underlying method, in declaration order
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* @throws GenericSignatureFormatError
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* if the generic method signature does not conform to the format
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* specified in
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* <cite>The Java™ Virtual Machine Specification</cite>
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* @throws TypeNotPresentException if any of the parameter
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* types of the underlying method refers to a non-existent type
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* declaration
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* @throws MalformedParameterizedTypeException if any of
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* the underlying method's parameter types refer to a parameterized
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* type that cannot be instantiated for any reason
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* @since 1.5
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*/
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public Type[] getGenericParameterTypes() {
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if (getGenericSignature() != null)
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return getGenericInfo().getParameterTypes();
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else
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return getParameterTypes();
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}
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/**
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* Returns an array of {@code Class} objects that represent
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* the types of the exceptions declared to be thrown
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* by the underlying method
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* represented by this {@code Method} object. Returns an array of length
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* 0 if the method declares no exceptions in its {@code throws} clause.
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*
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* @return the exception types declared as being thrown by the
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* method this object represents
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*/
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public Class<?>[] getExceptionTypes() {
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return (Class<?>[]) exceptionTypes.clone();
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}
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/**
|
jtulach@258
|
312 |
* Returns an array of {@code Type} objects that represent the
|
jtulach@258
|
313 |
* exceptions declared to be thrown by this {@code Method} object.
|
jtulach@258
|
314 |
* Returns an array of length 0 if the underlying method declares
|
jtulach@258
|
315 |
* no exceptions in its {@code throws} clause.
|
jtulach@258
|
316 |
*
|
jtulach@258
|
317 |
* <p>If an exception type is a type variable or a parameterized
|
jtulach@258
|
318 |
* type, it is created. Otherwise, it is resolved.
|
jtulach@258
|
319 |
*
|
jtulach@258
|
320 |
* @return an array of Types that represent the exception types
|
jtulach@258
|
321 |
* thrown by the underlying method
|
jtulach@258
|
322 |
* @throws GenericSignatureFormatError
|
jtulach@258
|
323 |
* if the generic method signature does not conform to the format
|
jtulach@258
|
324 |
* specified in
|
jtulach@258
|
325 |
* <cite>The Java™ Virtual Machine Specification</cite>
|
jtulach@258
|
326 |
* @throws TypeNotPresentException if the underlying method's
|
jtulach@258
|
327 |
* {@code throws} clause refers to a non-existent type declaration
|
jtulach@258
|
328 |
* @throws MalformedParameterizedTypeException if
|
jtulach@258
|
329 |
* the underlying method's {@code throws} clause refers to a
|
jtulach@258
|
330 |
* parameterized type that cannot be instantiated for any reason
|
jtulach@258
|
331 |
* @since 1.5
|
jtulach@258
|
332 |
*/
|
jtulach@258
|
333 |
public Type[] getGenericExceptionTypes() {
|
jtulach@258
|
334 |
Type[] result;
|
jtulach@258
|
335 |
if (getGenericSignature() != null &&
|
jtulach@258
|
336 |
((result = getGenericInfo().getExceptionTypes()).length > 0))
|
jtulach@258
|
337 |
return result;
|
jtulach@258
|
338 |
else
|
jtulach@258
|
339 |
return getExceptionTypes();
|
jtulach@258
|
340 |
}
|
jtulach@258
|
341 |
|
jtulach@258
|
342 |
/**
|
jtulach@258
|
343 |
* Compares this {@code Method} against the specified object. Returns
|
jtulach@258
|
344 |
* true if the objects are the same. Two {@code Methods} are the same if
|
jtulach@258
|
345 |
* they were declared by the same class and have the same name
|
jtulach@258
|
346 |
* and formal parameter types and return type.
|
jtulach@258
|
347 |
*/
|
jtulach@258
|
348 |
public boolean equals(Object obj) {
|
jtulach@258
|
349 |
if (obj != null && obj instanceof Method) {
|
jtulach@258
|
350 |
Method other = (Method)obj;
|
jtulach@258
|
351 |
if ((getDeclaringClass() == other.getDeclaringClass())
|
jtulach@258
|
352 |
&& (getName() == other.getName())) {
|
jtulach@258
|
353 |
if (!returnType.equals(other.getReturnType()))
|
jtulach@258
|
354 |
return false;
|
jtulach@258
|
355 |
/* Avoid unnecessary cloning */
|
jtulach@258
|
356 |
Class<?>[] params1 = parameterTypes;
|
jtulach@258
|
357 |
Class<?>[] params2 = other.parameterTypes;
|
jtulach@258
|
358 |
if (params1.length == params2.length) {
|
jtulach@258
|
359 |
for (int i = 0; i < params1.length; i++) {
|
jtulach@258
|
360 |
if (params1[i] != params2[i])
|
jtulach@258
|
361 |
return false;
|
jtulach@258
|
362 |
}
|
jtulach@258
|
363 |
return true;
|
jtulach@258
|
364 |
}
|
jtulach@258
|
365 |
}
|
jtulach@258
|
366 |
}
|
jtulach@258
|
367 |
return false;
|
jtulach@258
|
368 |
}
|
jtulach@258
|
369 |
|
jtulach@258
|
370 |
/**
|
jtulach@258
|
371 |
* Returns a hashcode for this {@code Method}. The hashcode is computed
|
jtulach@258
|
372 |
* as the exclusive-or of the hashcodes for the underlying
|
jtulach@258
|
373 |
* method's declaring class name and the method's name.
|
jtulach@258
|
374 |
*/
|
jtulach@258
|
375 |
public int hashCode() {
|
jtulach@258
|
376 |
return getDeclaringClass().getName().hashCode() ^ getName().hashCode();
|
jtulach@258
|
377 |
}
|
jtulach@258
|
378 |
|
jtulach@258
|
379 |
/**
|
jtulach@258
|
380 |
* Returns a string describing this {@code Method}. The string is
|
jtulach@258
|
381 |
* formatted as the method access modifiers, if any, followed by
|
jtulach@258
|
382 |
* the method return type, followed by a space, followed by the
|
jtulach@258
|
383 |
* class declaring the method, followed by a period, followed by
|
jtulach@258
|
384 |
* the method name, followed by a parenthesized, comma-separated
|
jtulach@258
|
385 |
* list of the method's formal parameter types. If the method
|
jtulach@258
|
386 |
* throws checked exceptions, the parameter list is followed by a
|
jtulach@258
|
387 |
* space, followed by the word throws followed by a
|
jtulach@258
|
388 |
* comma-separated list of the thrown exception types.
|
jtulach@258
|
389 |
* For example:
|
jtulach@258
|
390 |
* <pre>
|
jtulach@258
|
391 |
* public boolean java.lang.Object.equals(java.lang.Object)
|
jtulach@258
|
392 |
* </pre>
|
jtulach@258
|
393 |
*
|
jtulach@258
|
394 |
* <p>The access modifiers are placed in canonical order as
|
jtulach@258
|
395 |
* specified by "The Java Language Specification". This is
|
jtulach@258
|
396 |
* {@code public}, {@code protected} or {@code private} first,
|
jtulach@258
|
397 |
* and then other modifiers in the following order:
|
jtulach@258
|
398 |
* {@code abstract}, {@code static}, {@code final},
|
jtulach@258
|
399 |
* {@code synchronized}, {@code native}, {@code strictfp}.
|
jtulach@258
|
400 |
*/
|
jtulach@258
|
401 |
public String toString() {
|
jtulach@258
|
402 |
try {
|
jtulach@258
|
403 |
StringBuilder sb = new StringBuilder();
|
jtulach@258
|
404 |
int mod = getModifiers() & Modifier.methodModifiers();
|
jtulach@258
|
405 |
if (mod != 0) {
|
jtulach@258
|
406 |
sb.append(Modifier.toString(mod)).append(' ');
|
jtulach@258
|
407 |
}
|
jtulach@258
|
408 |
sb.append(Field.getTypeName(getReturnType())).append(' ');
|
jtulach@258
|
409 |
sb.append(Field.getTypeName(getDeclaringClass())).append('.');
|
jtulach@258
|
410 |
sb.append(getName()).append('(');
|
jtulach@258
|
411 |
Class<?>[] params = parameterTypes; // avoid clone
|
jtulach@258
|
412 |
for (int j = 0; j < params.length; j++) {
|
jtulach@258
|
413 |
sb.append(Field.getTypeName(params[j]));
|
jtulach@258
|
414 |
if (j < (params.length - 1))
|
jtulach@258
|
415 |
sb.append(',');
|
jtulach@258
|
416 |
}
|
jtulach@258
|
417 |
sb.append(')');
|
jtulach@258
|
418 |
Class<?>[] exceptions = exceptionTypes; // avoid clone
|
jtulach@258
|
419 |
if (exceptions.length > 0) {
|
jtulach@258
|
420 |
sb.append(" throws ");
|
jtulach@258
|
421 |
for (int k = 0; k < exceptions.length; k++) {
|
jtulach@258
|
422 |
sb.append(exceptions[k].getName());
|
jtulach@258
|
423 |
if (k < (exceptions.length - 1))
|
jtulach@258
|
424 |
sb.append(',');
|
jtulach@258
|
425 |
}
|
jtulach@258
|
426 |
}
|
jtulach@258
|
427 |
return sb.toString();
|
jtulach@258
|
428 |
} catch (Exception e) {
|
jtulach@258
|
429 |
return "<" + e + ">";
|
jtulach@258
|
430 |
}
|
jtulach@258
|
431 |
}
|
jtulach@258
|
432 |
|
jtulach@258
|
433 |
/**
|
jtulach@258
|
434 |
* Returns a string describing this {@code Method}, including
|
jtulach@258
|
435 |
* type parameters. The string is formatted as the method access
|
jtulach@258
|
436 |
* modifiers, if any, followed by an angle-bracketed
|
jtulach@258
|
437 |
* comma-separated list of the method's type parameters, if any,
|
jtulach@258
|
438 |
* followed by the method's generic return type, followed by a
|
jtulach@258
|
439 |
* space, followed by the class declaring the method, followed by
|
jtulach@258
|
440 |
* a period, followed by the method name, followed by a
|
jtulach@258
|
441 |
* parenthesized, comma-separated list of the method's generic
|
jtulach@258
|
442 |
* formal parameter types.
|
jtulach@258
|
443 |
*
|
jtulach@258
|
444 |
* If this method was declared to take a variable number of
|
jtulach@258
|
445 |
* arguments, instead of denoting the last parameter as
|
jtulach@258
|
446 |
* "<tt><i>Type</i>[]</tt>", it is denoted as
|
jtulach@258
|
447 |
* "<tt><i>Type</i>...</tt>".
|
jtulach@258
|
448 |
*
|
jtulach@258
|
449 |
* A space is used to separate access modifiers from one another
|
jtulach@258
|
450 |
* and from the type parameters or return type. If there are no
|
jtulach@258
|
451 |
* type parameters, the type parameter list is elided; if the type
|
jtulach@258
|
452 |
* parameter list is present, a space separates the list from the
|
jtulach@258
|
453 |
* class name. If the method is declared to throw exceptions, the
|
jtulach@258
|
454 |
* parameter list is followed by a space, followed by the word
|
jtulach@258
|
455 |
* throws followed by a comma-separated list of the generic thrown
|
jtulach@258
|
456 |
* exception types. If there are no type parameters, the type
|
jtulach@258
|
457 |
* parameter list is elided.
|
jtulach@258
|
458 |
*
|
jtulach@258
|
459 |
* <p>The access modifiers are placed in canonical order as
|
jtulach@258
|
460 |
* specified by "The Java Language Specification". This is
|
jtulach@258
|
461 |
* {@code public}, {@code protected} or {@code private} first,
|
jtulach@258
|
462 |
* and then other modifiers in the following order:
|
jtulach@258
|
463 |
* {@code abstract}, {@code static}, {@code final},
|
jtulach@258
|
464 |
* {@code synchronized}, {@code native}, {@code strictfp}.
|
jtulach@258
|
465 |
*
|
jtulach@258
|
466 |
* @return a string describing this {@code Method},
|
jtulach@258
|
467 |
* include type parameters
|
jtulach@258
|
468 |
*
|
jtulach@258
|
469 |
* @since 1.5
|
jtulach@258
|
470 |
*/
|
jtulach@258
|
471 |
public String toGenericString() {
|
jtulach@258
|
472 |
try {
|
jtulach@258
|
473 |
StringBuilder sb = new StringBuilder();
|
jtulach@258
|
474 |
int mod = getModifiers() & Modifier.methodModifiers();
|
jtulach@258
|
475 |
if (mod != 0) {
|
jtulach@258
|
476 |
sb.append(Modifier.toString(mod)).append(' ');
|
jtulach@258
|
477 |
}
|
jtulach@258
|
478 |
TypeVariable<?>[] typeparms = getTypeParameters();
|
jtulach@258
|
479 |
if (typeparms.length > 0) {
|
jtulach@258
|
480 |
boolean first = true;
|
jtulach@258
|
481 |
sb.append('<');
|
jtulach@258
|
482 |
for(TypeVariable<?> typeparm: typeparms) {
|
jtulach@258
|
483 |
if (!first)
|
jtulach@258
|
484 |
sb.append(',');
|
jtulach@258
|
485 |
// Class objects can't occur here; no need to test
|
jtulach@258
|
486 |
// and call Class.getName().
|
jtulach@258
|
487 |
sb.append(typeparm.toString());
|
jtulach@258
|
488 |
first = false;
|
jtulach@258
|
489 |
}
|
jtulach@258
|
490 |
sb.append("> ");
|
jtulach@258
|
491 |
}
|
jtulach@258
|
492 |
|
jtulach@258
|
493 |
Type genRetType = getGenericReturnType();
|
jtulach@258
|
494 |
sb.append( ((genRetType instanceof Class<?>)?
|
jtulach@258
|
495 |
Field.getTypeName((Class<?>)genRetType):genRetType.toString()))
|
jtulach@258
|
496 |
.append(' ');
|
jtulach@258
|
497 |
|
jtulach@258
|
498 |
sb.append(Field.getTypeName(getDeclaringClass())).append('.');
|
jtulach@258
|
499 |
sb.append(getName()).append('(');
|
jtulach@258
|
500 |
Type[] params = getGenericParameterTypes();
|
jtulach@258
|
501 |
for (int j = 0; j < params.length; j++) {
|
jtulach@258
|
502 |
String param = (params[j] instanceof Class)?
|
jtulach@258
|
503 |
Field.getTypeName((Class)params[j]):
|
jtulach@258
|
504 |
(params[j].toString());
|
jtulach@258
|
505 |
if (isVarArgs() && (j == params.length - 1)) // replace T[] with T...
|
jtulach@258
|
506 |
param = param.replaceFirst("\\[\\]$", "...");
|
jtulach@258
|
507 |
sb.append(param);
|
jtulach@258
|
508 |
if (j < (params.length - 1))
|
jtulach@258
|
509 |
sb.append(',');
|
jtulach@258
|
510 |
}
|
jtulach@258
|
511 |
sb.append(')');
|
jtulach@258
|
512 |
Type[] exceptions = getGenericExceptionTypes();
|
jtulach@258
|
513 |
if (exceptions.length > 0) {
|
jtulach@258
|
514 |
sb.append(" throws ");
|
jtulach@258
|
515 |
for (int k = 0; k < exceptions.length; k++) {
|
jtulach@258
|
516 |
sb.append((exceptions[k] instanceof Class)?
|
jtulach@258
|
517 |
((Class)exceptions[k]).getName():
|
jtulach@258
|
518 |
exceptions[k].toString());
|
jtulach@258
|
519 |
if (k < (exceptions.length - 1))
|
jtulach@258
|
520 |
sb.append(',');
|
jtulach@258
|
521 |
}
|
jtulach@258
|
522 |
}
|
jtulach@258
|
523 |
return sb.toString();
|
jtulach@258
|
524 |
} catch (Exception e) {
|
jtulach@258
|
525 |
return "<" + e + ">";
|
jtulach@258
|
526 |
}
|
jtulach@258
|
527 |
}
|
jtulach@258
|
528 |
|
jtulach@258
|
529 |
/**
|
jtulach@258
|
530 |
* Invokes the underlying method represented by this {@code Method}
|
jtulach@258
|
531 |
* object, on the specified object with the specified parameters.
|
jtulach@258
|
532 |
* Individual parameters are automatically unwrapped to match
|
jtulach@258
|
533 |
* primitive formal parameters, and both primitive and reference
|
jtulach@258
|
534 |
* parameters are subject to method invocation conversions as
|
jtulach@258
|
535 |
* necessary.
|
jtulach@258
|
536 |
*
|
jtulach@258
|
537 |
* <p>If the underlying method is static, then the specified {@code obj}
|
jtulach@258
|
538 |
* argument is ignored. It may be null.
|
jtulach@258
|
539 |
*
|
jtulach@258
|
540 |
* <p>If the number of formal parameters required by the underlying method is
|
jtulach@258
|
541 |
* 0, the supplied {@code args} array may be of length 0 or null.
|
jtulach@258
|
542 |
*
|
jtulach@258
|
543 |
* <p>If the underlying method is an instance method, it is invoked
|
jtulach@258
|
544 |
* using dynamic method lookup as documented in The Java Language
|
jtulach@258
|
545 |
* Specification, Second Edition, section 15.12.4.4; in particular,
|
jtulach@258
|
546 |
* overriding based on the runtime type of the target object will occur.
|
jtulach@258
|
547 |
*
|
jtulach@258
|
548 |
* <p>If the underlying method is static, the class that declared
|
jtulach@258
|
549 |
* the method is initialized if it has not already been initialized.
|
jtulach@258
|
550 |
*
|
jtulach@258
|
551 |
* <p>If the method completes normally, the value it returns is
|
jtulach@258
|
552 |
* returned to the caller of invoke; if the value has a primitive
|
jtulach@258
|
553 |
* type, it is first appropriately wrapped in an object. However,
|
jtulach@258
|
554 |
* if the value has the type of an array of a primitive type, the
|
jtulach@258
|
555 |
* elements of the array are <i>not</i> wrapped in objects; in
|
jtulach@258
|
556 |
* other words, an array of primitive type is returned. If the
|
jtulach@258
|
557 |
* underlying method return type is void, the invocation returns
|
jtulach@258
|
558 |
* null.
|
jtulach@258
|
559 |
*
|
jtulach@258
|
560 |
* @param obj the object the underlying method is invoked from
|
jtulach@258
|
561 |
* @param args the arguments used for the method call
|
jtulach@258
|
562 |
* @return the result of dispatching the method represented by
|
jtulach@258
|
563 |
* this object on {@code obj} with parameters
|
jtulach@258
|
564 |
* {@code args}
|
jtulach@258
|
565 |
*
|
jtulach@258
|
566 |
* @exception IllegalAccessException if this {@code Method} object
|
jtulach@258
|
567 |
* is enforcing Java language access control and the underlying
|
jtulach@258
|
568 |
* method is inaccessible.
|
jtulach@258
|
569 |
* @exception IllegalArgumentException if the method is an
|
jtulach@258
|
570 |
* instance method and the specified object argument
|
jtulach@258
|
571 |
* is not an instance of the class or interface
|
jtulach@258
|
572 |
* declaring the underlying method (or of a subclass
|
jtulach@258
|
573 |
* or implementor thereof); if the number of actual
|
jtulach@258
|
574 |
* and formal parameters differ; if an unwrapping
|
jtulach@258
|
575 |
* conversion for primitive arguments fails; or if,
|
jtulach@258
|
576 |
* after possible unwrapping, a parameter value
|
jtulach@258
|
577 |
* cannot be converted to the corresponding formal
|
jtulach@258
|
578 |
* parameter type by a method invocation conversion.
|
jtulach@258
|
579 |
* @exception InvocationTargetException if the underlying method
|
jtulach@258
|
580 |
* throws an exception.
|
jtulach@258
|
581 |
* @exception NullPointerException if the specified object is null
|
jtulach@258
|
582 |
* and the method is an instance method.
|
jtulach@258
|
583 |
* @exception ExceptionInInitializerError if the initialization
|
jtulach@258
|
584 |
* provoked by this method fails.
|
jtulach@258
|
585 |
*/
|
jtulach@258
|
586 |
public Object invoke(Object obj, Object... args)
|
jtulach@258
|
587 |
throws IllegalAccessException, IllegalArgumentException,
|
jtulach@258
|
588 |
InvocationTargetException
|
jtulach@258
|
589 |
{
|
jtulach@258
|
590 |
if (!override) {
|
jtulach@258
|
591 |
if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) {
|
jtulach@258
|
592 |
Class<?> caller = Reflection.getCallerClass(1);
|
jtulach@258
|
593 |
|
jtulach@258
|
594 |
checkAccess(caller, clazz, obj, modifiers);
|
jtulach@258
|
595 |
}
|
jtulach@258
|
596 |
}
|
jtulach@258
|
597 |
MethodAccessor ma = methodAccessor; // read volatile
|
jtulach@258
|
598 |
if (ma == null) {
|
jtulach@258
|
599 |
ma = acquireMethodAccessor();
|
jtulach@258
|
600 |
}
|
jtulach@258
|
601 |
return ma.invoke(obj, args);
|
jtulach@258
|
602 |
}
|
jtulach@258
|
603 |
|
jtulach@258
|
604 |
/**
|
jtulach@258
|
605 |
* Returns {@code true} if this method is a bridge
|
jtulach@258
|
606 |
* method; returns {@code false} otherwise.
|
jtulach@258
|
607 |
*
|
jtulach@258
|
608 |
* @return true if and only if this method is a bridge
|
jtulach@258
|
609 |
* method as defined by the Java Language Specification.
|
jtulach@258
|
610 |
* @since 1.5
|
jtulach@258
|
611 |
*/
|
jtulach@258
|
612 |
public boolean isBridge() {
|
jtulach@258
|
613 |
return (getModifiers() & Modifier.BRIDGE) != 0;
|
jtulach@258
|
614 |
}
|
jtulach@258
|
615 |
|
jtulach@258
|
616 |
/**
|
jtulach@258
|
617 |
* Returns {@code true} if this method was declared to take
|
jtulach@258
|
618 |
* a variable number of arguments; returns {@code false}
|
jtulach@258
|
619 |
* otherwise.
|
jtulach@258
|
620 |
*
|
jtulach@258
|
621 |
* @return {@code true} if an only if this method was declared to
|
jtulach@258
|
622 |
* take a variable number of arguments.
|
jtulach@258
|
623 |
* @since 1.5
|
jtulach@258
|
624 |
*/
|
jtulach@258
|
625 |
public boolean isVarArgs() {
|
jtulach@258
|
626 |
return (getModifiers() & Modifier.VARARGS) != 0;
|
jtulach@258
|
627 |
}
|
jtulach@258
|
628 |
|
jtulach@258
|
629 |
/**
|
jtulach@258
|
630 |
* Returns {@code true} if this method is a synthetic
|
jtulach@258
|
631 |
* method; returns {@code false} otherwise.
|
jtulach@258
|
632 |
*
|
jtulach@258
|
633 |
* @return true if and only if this method is a synthetic
|
jtulach@258
|
634 |
* method as defined by the Java Language Specification.
|
jtulach@258
|
635 |
* @since 1.5
|
jtulach@258
|
636 |
*/
|
jtulach@258
|
637 |
public boolean isSynthetic() {
|
jtulach@258
|
638 |
return Modifier.isSynthetic(getModifiers());
|
jtulach@258
|
639 |
}
|
jtulach@258
|
640 |
|
jtulach@258
|
641 |
// NOTE that there is no synchronization used here. It is correct
|
jtulach@258
|
642 |
// (though not efficient) to generate more than one MethodAccessor
|
jtulach@258
|
643 |
// for a given Method. However, avoiding synchronization will
|
jtulach@258
|
644 |
// probably make the implementation more scalable.
|
jtulach@258
|
645 |
private MethodAccessor acquireMethodAccessor() {
|
jtulach@258
|
646 |
// First check to see if one has been created yet, and take it
|
jtulach@258
|
647 |
// if so
|
jtulach@258
|
648 |
MethodAccessor tmp = null;
|
jtulach@258
|
649 |
if (root != null) tmp = root.getMethodAccessor();
|
jtulach@258
|
650 |
if (tmp != null) {
|
jtulach@258
|
651 |
methodAccessor = tmp;
|
jtulach@258
|
652 |
} else {
|
jtulach@258
|
653 |
// Otherwise fabricate one and propagate it up to the root
|
jtulach@258
|
654 |
tmp = reflectionFactory.newMethodAccessor(this);
|
jtulach@258
|
655 |
setMethodAccessor(tmp);
|
jtulach@258
|
656 |
}
|
jtulach@258
|
657 |
|
jtulach@258
|
658 |
return tmp;
|
jtulach@258
|
659 |
}
|
jtulach@258
|
660 |
|
jtulach@258
|
661 |
// Returns MethodAccessor for this Method object, not looking up
|
jtulach@258
|
662 |
// the chain to the root
|
jtulach@258
|
663 |
MethodAccessor getMethodAccessor() {
|
jtulach@258
|
664 |
return methodAccessor;
|
jtulach@258
|
665 |
}
|
jtulach@258
|
666 |
|
jtulach@258
|
667 |
// Sets the MethodAccessor for this Method object and
|
jtulach@258
|
668 |
// (recursively) its root
|
jtulach@258
|
669 |
void setMethodAccessor(MethodAccessor accessor) {
|
jtulach@258
|
670 |
methodAccessor = accessor;
|
jtulach@258
|
671 |
// Propagate up
|
jtulach@258
|
672 |
if (root != null) {
|
jtulach@258
|
673 |
root.setMethodAccessor(accessor);
|
jtulach@258
|
674 |
}
|
jtulach@258
|
675 |
}
|
jtulach@258
|
676 |
|
jtulach@258
|
677 |
/**
|
jtulach@258
|
678 |
* @throws NullPointerException {@inheritDoc}
|
jtulach@258
|
679 |
* @since 1.5
|
jtulach@258
|
680 |
*/
|
jtulach@258
|
681 |
public <T extends Annotation> T getAnnotation(Class<T> annotationClass) {
|
jtulach@258
|
682 |
if (annotationClass == null)
|
jtulach@258
|
683 |
throw new NullPointerException();
|
jtulach@258
|
684 |
|
jtulach@258
|
685 |
return (T) declaredAnnotations().get(annotationClass);
|
jtulach@258
|
686 |
}
|
jtulach@258
|
687 |
|
jtulach@258
|
688 |
/**
|
jtulach@258
|
689 |
* @since 1.5
|
jtulach@258
|
690 |
*/
|
jtulach@258
|
691 |
public Annotation[] getDeclaredAnnotations() {
|
jtulach@258
|
692 |
return AnnotationParser.toArray(declaredAnnotations());
|
jtulach@258
|
693 |
}
|
jtulach@258
|
694 |
|
jtulach@258
|
695 |
private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations;
|
jtulach@258
|
696 |
|
jtulach@258
|
697 |
private synchronized Map<Class<? extends Annotation>, Annotation> declaredAnnotations() {
|
jtulach@258
|
698 |
if (declaredAnnotations == null) {
|
jtulach@258
|
699 |
declaredAnnotations = AnnotationParser.parseAnnotations(
|
jtulach@258
|
700 |
annotations, sun.misc.SharedSecrets.getJavaLangAccess().
|
jtulach@258
|
701 |
getConstantPool(getDeclaringClass()),
|
jtulach@258
|
702 |
getDeclaringClass());
|
jtulach@258
|
703 |
}
|
jtulach@258
|
704 |
return declaredAnnotations;
|
jtulach@258
|
705 |
}
|
jtulach@258
|
706 |
|
jtulach@258
|
707 |
/**
|
jtulach@258
|
708 |
* Returns the default value for the annotation member represented by
|
jtulach@258
|
709 |
* this {@code Method} instance. If the member is of a primitive type,
|
jtulach@258
|
710 |
* an instance of the corresponding wrapper type is returned. Returns
|
jtulach@258
|
711 |
* null if no default is associated with the member, or if the method
|
jtulach@258
|
712 |
* instance does not represent a declared member of an annotation type.
|
jtulach@258
|
713 |
*
|
jtulach@258
|
714 |
* @return the default value for the annotation member represented
|
jtulach@258
|
715 |
* by this {@code Method} instance.
|
jtulach@258
|
716 |
* @throws TypeNotPresentException if the annotation is of type
|
jtulach@258
|
717 |
* {@link Class} and no definition can be found for the
|
jtulach@258
|
718 |
* default class value.
|
jtulach@258
|
719 |
* @since 1.5
|
jtulach@258
|
720 |
*/
|
jtulach@258
|
721 |
public Object getDefaultValue() {
|
jtulach@258
|
722 |
if (annotationDefault == null)
|
jtulach@258
|
723 |
return null;
|
jtulach@258
|
724 |
Class<?> memberType = AnnotationType.invocationHandlerReturnType(
|
jtulach@258
|
725 |
getReturnType());
|
jtulach@258
|
726 |
Object result = AnnotationParser.parseMemberValue(
|
jtulach@258
|
727 |
memberType, ByteBuffer.wrap(annotationDefault),
|
jtulach@258
|
728 |
sun.misc.SharedSecrets.getJavaLangAccess().
|
jtulach@258
|
729 |
getConstantPool(getDeclaringClass()),
|
jtulach@258
|
730 |
getDeclaringClass());
|
jtulach@258
|
731 |
if (result instanceof sun.reflect.annotation.ExceptionProxy)
|
jtulach@258
|
732 |
throw new AnnotationFormatError("Invalid default: " + this);
|
jtulach@258
|
733 |
return result;
|
jtulach@258
|
734 |
}
|
jtulach@258
|
735 |
|
jtulach@258
|
736 |
/**
|
jtulach@258
|
737 |
* Returns an array of arrays that represent the annotations on the formal
|
jtulach@258
|
738 |
* parameters, in declaration order, of the method represented by
|
jtulach@258
|
739 |
* this {@code Method} object. (Returns an array of length zero if the
|
jtulach@258
|
740 |
* underlying method is parameterless. If the method has one or more
|
jtulach@258
|
741 |
* parameters, a nested array of length zero is returned for each parameter
|
jtulach@258
|
742 |
* with no annotations.) The annotation objects contained in the returned
|
jtulach@258
|
743 |
* arrays are serializable. The caller of this method is free to modify
|
jtulach@258
|
744 |
* the returned arrays; it will have no effect on the arrays returned to
|
jtulach@258
|
745 |
* other callers.
|
jtulach@258
|
746 |
*
|
jtulach@258
|
747 |
* @return an array of arrays that represent the annotations on the formal
|
jtulach@258
|
748 |
* parameters, in declaration order, of the method represented by this
|
jtulach@258
|
749 |
* Method object
|
jtulach@258
|
750 |
* @since 1.5
|
jtulach@258
|
751 |
*/
|
jtulach@258
|
752 |
public Annotation[][] getParameterAnnotations() {
|
jtulach@258
|
753 |
int numParameters = parameterTypes.length;
|
jtulach@258
|
754 |
if (parameterAnnotations == null)
|
jtulach@258
|
755 |
return new Annotation[numParameters][0];
|
jtulach@258
|
756 |
|
jtulach@258
|
757 |
Annotation[][] result = AnnotationParser.parseParameterAnnotations(
|
jtulach@258
|
758 |
parameterAnnotations,
|
jtulach@258
|
759 |
sun.misc.SharedSecrets.getJavaLangAccess().
|
jtulach@258
|
760 |
getConstantPool(getDeclaringClass()),
|
jtulach@258
|
761 |
getDeclaringClass());
|
jtulach@258
|
762 |
if (result.length != numParameters)
|
jtulach@258
|
763 |
throw new java.lang.annotation.AnnotationFormatError(
|
jtulach@258
|
764 |
"Parameter annotations don't match number of parameters");
|
jtulach@258
|
765 |
return result;
|
jtulach@258
|
766 |
}
|
jtulach@258
|
767 |
}
|