author | jjg |
Mon, 15 Aug 2011 17:17:21 -0700 | |
changeset 10342 | ca0984bc9d32 |
parent 9266 | 121fb370f179 |
child 14342 | 8435a30053c1 |
permissions | -rw-r--r-- |
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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.FieldAccessor; |
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import sun.reflect.Reflection; |
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import sun.reflect.generics.repository.FieldRepository; |
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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.ClassScope; |
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import java.lang.annotation.Annotation; |
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import java.util.Map; |
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import sun.reflect.annotation.AnnotationParser; |
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/** |
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* A {@code Field} provides information about, and dynamic access to, a |
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* single field of a class or an interface. The reflected field may |
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* be a class (static) field or an instance field. |
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* |
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* <p>A {@code Field} permits widening conversions to occur during a get or |
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* set access operation, but 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#getFields() |
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* @see java.lang.Class#getField(String) |
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* @see java.lang.Class#getDeclaredFields() |
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* @see java.lang.Class#getDeclaredField(String) |
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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 Field extends AccessibleObject implements 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<?> type; |
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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 FieldRepository genericInfo; |
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private byte[] annotations; |
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// Cached field accessor created without override |
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private FieldAccessor fieldAccessor; |
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// Cached field accessor created with override |
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private FieldAccessor overrideFieldAccessor; |
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// For sharing of FieldAccessors. This branching structure is |
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// currently only two levels deep (i.e., one root Field and |
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// potentially many Field objects pointing to it.) |
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private Field 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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Class<?> c = getDeclaringClass(); |
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// create scope and factory |
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return CoreReflectionFactory.make(c, ClassScope.make(c)); |
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} |
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// Accessor for generic info repository |
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private FieldRepository 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 = FieldRepository.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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Field(Class<?> declaringClass, |
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String name, |
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Class<?> type, |
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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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{ |
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this.clazz = declaringClass; |
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this.name = name; |
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this.type = type; |
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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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} |
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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 Field. The copy's |
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* "root" field points to this Field. |
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*/ |
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Field copy() { |
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// This routine enables sharing of FieldAccessor objects |
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// among Field 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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Field res = new Field(clazz, name, type, modifiers, slot, signature, annotations); |
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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.fieldAccessor = fieldAccessor; |
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res.overrideFieldAccessor = overrideFieldAccessor; |
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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 field represented by this {@code Field} 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 field represented by this {@code Field} object. |
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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 field represented |
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* by this {@code Field} 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 {@code true} if this field represents an element of |
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* an enumerated type; returns {@code false} otherwise. |
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* |
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* @return {@code true} if and only if this field represents an element of |
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* an enumerated type. |
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* @since 1.5 |
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*/ |
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public boolean isEnumConstant() { |
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return (getModifiers() & Modifier.ENUM) != 0; |
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} |
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/** |
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* Returns {@code true} if this field is a synthetic |
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* field; returns {@code false} otherwise. |
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* |
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* @return true if and only if this field is a synthetic |
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* field as defined by the Java Language Specification. |
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* @since 1.5 |
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*/ |
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public boolean isSynthetic() { |
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return Modifier.isSynthetic(getModifiers()); |
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} |
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/** |
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* Returns a {@code Class} object that identifies the |
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* declared type for the field represented by this |
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* {@code Field} object. |
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* |
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* @return a {@code Class} object identifying the declared |
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* type of the field represented by this object |
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*/ |
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public Class<?> getType() { |
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return type; |
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} |
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/** |
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* Returns a {@code Type} object that represents the declared type for |
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* the field represented by this {@code Field} object. |
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* |
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* <p>If the {@code Type} is a parameterized type, the |
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* {@code Type} object returned must accurately reflect the |
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* actual type parameters used in the source code. |
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* |
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* <p>If the type of the underlying field is a type variable or a |
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* parameterized type, it is created. Otherwise, it is resolved. |
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* |
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* @return a {@code Type} object that represents the declared type for |
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* the field represented by this {@code Field} object |
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* @throws GenericSignatureFormatError if the generic field |
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* signature does not conform to the format specified in |
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* <cite>The Java™ Virtual Machine Specification</cite> |
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* @throws TypeNotPresentException if the generic type |
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* signature of the underlying field refers to a non-existent |
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* type declaration |
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* @throws MalformedParameterizedTypeException if the generic |
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* signature of the underlying field refers to a parameterized type |
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* that cannot be instantiated for any reason |
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* @since 1.5 |
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*/ |
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public Type getGenericType() { |
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if (getGenericSignature() != null) |
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return getGenericInfo().getGenericType(); |
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else |
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return getType(); |
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} |
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/** |
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* Compares this {@code Field} against the specified object. Returns |
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* true if the objects are the same. Two {@code Field} objects are the same if |
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* they were declared by the same class and have the same name |
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* and type. |
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*/ |
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public boolean equals(Object obj) { |
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if (obj != null && obj instanceof Field) { |
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Field other = (Field)obj; |
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return (getDeclaringClass() == other.getDeclaringClass()) |
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&& (getName() == other.getName()) |
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&& (getType() == other.getType()); |
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} |
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return false; |
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} |
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/** |
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* Returns a hashcode for this {@code Field}. This is computed as the |
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* exclusive-or of the hashcodes for the underlying field's |
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* declaring class name and its name. |
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*/ |
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public int hashCode() { |
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return getDeclaringClass().getName().hashCode() ^ getName().hashCode(); |
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} |
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/** |
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* Returns a string describing this {@code Field}. The format is |
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* the access modifiers for the field, if any, followed |
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* by the field type, followed by a space, followed by |
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* the fully-qualified name of the class declaring the field, |
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* followed by a period, followed by the name of the field. |
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* For example: |
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* <pre> |
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* public static final int java.lang.Thread.MIN_PRIORITY |
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* private int java.io.FileDescriptor.fd |
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* </pre> |
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* |
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* <p>The modifiers are placed in canonical order as specified by |
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* "The Java Language Specification". This is {@code public}, |
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* {@code protected} or {@code private} first, and then other |
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* modifiers in the following order: {@code static}, {@code final}, |
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* {@code transient}, {@code volatile}. |
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*/ |
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public String toString() { |
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int mod = getModifiers(); |
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return (((mod == 0) ? "" : (Modifier.toString(mod) + " ")) |
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+ getTypeName(getType()) + " " |
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+ getTypeName(getDeclaringClass()) + "." |
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+ getName()); |
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} |
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/** |
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* Returns a string describing this {@code Field}, including |
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* its generic type. The format is the access modifiers for the |
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* field, if any, followed by the generic field type, followed by |
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* a space, followed by the fully-qualified name of the class |
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* declaring the field, followed by a period, followed by the name |
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* of the field. |
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* |
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* <p>The modifiers are placed in canonical order as specified by |
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* "The Java Language Specification". This is {@code public}, |
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* {@code protected} or {@code private} first, and then other |
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* modifiers in the following order: {@code static}, {@code final}, |
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* {@code transient}, {@code volatile}. |
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* |
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* @return a string describing this {@code Field}, including |
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* its generic type |
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* |
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* @since 1.5 |
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*/ |
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312 |
public String toGenericString() { |
|
313 |
int mod = getModifiers(); |
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Type fieldType = getGenericType(); |
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return (((mod == 0) ? "" : (Modifier.toString(mod) + " ")) |
|
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+ ((fieldType instanceof Class) ? |
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getTypeName((Class)fieldType): fieldType.toString())+ " " |
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+ getTypeName(getDeclaringClass()) + "." |
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+ getName()); |
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} |
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321 |
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322 |
/** |
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* Returns the value of the field represented by this {@code Field}, on |
|
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* the specified object. The value is automatically wrapped in an |
|
325 |
* object if it has a primitive type. |
|
326 |
* |
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327 |
* <p>The underlying field's value is obtained as follows: |
|
328 |
* |
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* <p>If the underlying field is a static field, the {@code obj} argument |
|
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* is ignored; it may be null. |
|
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* |
|
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* <p>Otherwise, the underlying field is an instance field. If the |
|
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* specified {@code obj} argument is null, the method throws a |
|
334 |
* {@code NullPointerException}. If the specified object is not an |
|
335 |
* instance of the class or interface declaring the underlying |
|
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* field, the method throws an {@code IllegalArgumentException}. |
|
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* |
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* <p>If this {@code Field} object is enforcing Java language access control, and |
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* the underlying field is inaccessible, the method throws an |
340 |
* {@code IllegalAccessException}. |
|
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* If the underlying field is static, the class that declared the |
|
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* field is initialized if it has not already been initialized. |
|
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* |
|
344 |
* <p>Otherwise, the value is retrieved from the underlying instance |
|
345 |
* or static field. If the field has a primitive type, the value |
|
346 |
* is wrapped in an object before being returned, otherwise it is |
|
347 |
* returned as is. |
|
348 |
* |
|
349 |
* <p>If the field is hidden in the type of {@code obj}, |
|
350 |
* the field's value is obtained according to the preceding rules. |
|
351 |
* |
|
352 |
* @param obj object from which the represented field's value is |
|
353 |
* to be extracted |
|
354 |
* @return the value of the represented field in object |
|
355 |
* {@code obj}; primitive values are wrapped in an appropriate |
|
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* object before being returned |
|
357 |
* |
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* @exception IllegalAccessException if this {@code Field} object |
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* is enforcing Java language access control and the underlying |
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* field is inaccessible. |
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* @exception IllegalArgumentException if the specified object is not an |
362 |
* instance of the class or interface declaring the underlying |
|
363 |
* field (or a subclass or implementor thereof). |
|
364 |
* @exception NullPointerException if the specified object is null |
|
365 |
* and the field is an instance field. |
|
366 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
367 |
* by this method fails. |
|
368 |
*/ |
|
369 |
public Object get(Object obj) |
|
370 |
throws IllegalArgumentException, IllegalAccessException |
|
371 |
{ |
|
372 |
return getFieldAccessor(obj).get(obj); |
|
373 |
} |
|
374 |
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375 |
/** |
|
376 |
* Gets the value of a static or instance {@code boolean} field. |
|
377 |
* |
|
378 |
* @param obj the object to extract the {@code boolean} value |
|
379 |
* from |
|
380 |
* @return the value of the {@code boolean} field |
|
381 |
* |
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* @exception IllegalAccessException if this {@code Field} object |
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* is enforcing Java language access control and the underlying |
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* field is inaccessible. |
2 | 385 |
* @exception IllegalArgumentException if the specified object is not |
386 |
* an instance of the class or interface declaring the |
|
387 |
* underlying field (or a subclass or implementor |
|
388 |
* thereof), or if the field value cannot be |
|
389 |
* converted to the type {@code boolean} by a |
|
390 |
* widening conversion. |
|
391 |
* @exception NullPointerException if the specified object is null |
|
392 |
* and the field is an instance field. |
|
393 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
394 |
* by this method fails. |
|
395 |
* @see Field#get |
|
396 |
*/ |
|
397 |
public boolean getBoolean(Object obj) |
|
398 |
throws IllegalArgumentException, IllegalAccessException |
|
399 |
{ |
|
400 |
return getFieldAccessor(obj).getBoolean(obj); |
|
401 |
} |
|
402 |
||
403 |
/** |
|
404 |
* Gets the value of a static or instance {@code byte} field. |
|
405 |
* |
|
406 |
* @param obj the object to extract the {@code byte} value |
|
407 |
* from |
|
408 |
* @return the value of the {@code byte} field |
|
409 |
* |
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* @exception IllegalAccessException if this {@code Field} object |
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* is enforcing Java language access control and the underlying |
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* field is inaccessible. |
2 | 413 |
* @exception IllegalArgumentException if the specified object is not |
414 |
* an instance of the class or interface declaring the |
|
415 |
* underlying field (or a subclass or implementor |
|
416 |
* thereof), or if the field value cannot be |
|
417 |
* converted to the type {@code byte} by a |
|
418 |
* widening conversion. |
|
419 |
* @exception NullPointerException if the specified object is null |
|
420 |
* and the field is an instance field. |
|
421 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
422 |
* by this method fails. |
|
423 |
* @see Field#get |
|
424 |
*/ |
|
425 |
public byte getByte(Object obj) |
|
426 |
throws IllegalArgumentException, IllegalAccessException |
|
427 |
{ |
|
428 |
return getFieldAccessor(obj).getByte(obj); |
|
429 |
} |
|
430 |
||
431 |
/** |
|
432 |
* Gets the value of a static or instance field of type |
|
433 |
* {@code char} or of another primitive type convertible to |
|
434 |
* type {@code char} via a widening conversion. |
|
435 |
* |
|
436 |
* @param obj the object to extract the {@code char} value |
|
437 |
* from |
|
438 |
* @return the value of the field converted to type {@code char} |
|
439 |
* |
|
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|
440 |
* @exception IllegalAccessException if this {@code Field} object |
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|
441 |
* is enforcing Java language access control and the underlying |
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|
442 |
* field is inaccessible. |
2 | 443 |
* @exception IllegalArgumentException if the specified object is not |
444 |
* an instance of the class or interface declaring the |
|
445 |
* underlying field (or a subclass or implementor |
|
446 |
* thereof), or if the field value cannot be |
|
447 |
* converted to the type {@code char} by a |
|
448 |
* widening conversion. |
|
449 |
* @exception NullPointerException if the specified object is null |
|
450 |
* and the field is an instance field. |
|
451 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
452 |
* by this method fails. |
|
453 |
* @see Field#get |
|
454 |
*/ |
|
455 |
public char getChar(Object obj) |
|
456 |
throws IllegalArgumentException, IllegalAccessException |
|
457 |
{ |
|
458 |
return getFieldAccessor(obj).getChar(obj); |
|
459 |
} |
|
460 |
||
461 |
/** |
|
462 |
* Gets the value of a static or instance field of type |
|
463 |
* {@code short} or of another primitive type convertible to |
|
464 |
* type {@code short} via a widening conversion. |
|
465 |
* |
|
466 |
* @param obj the object to extract the {@code short} value |
|
467 |
* from |
|
468 |
* @return the value of the field converted to type {@code short} |
|
469 |
* |
|
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|
470 |
* @exception IllegalAccessException if this {@code Field} object |
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|
471 |
* is enforcing Java language access control and the underlying |
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|
472 |
* field is inaccessible. |
2 | 473 |
* @exception IllegalArgumentException if the specified object is not |
474 |
* an instance of the class or interface declaring the |
|
475 |
* underlying field (or a subclass or implementor |
|
476 |
* thereof), or if the field value cannot be |
|
477 |
* converted to the type {@code short} by a |
|
478 |
* widening conversion. |
|
479 |
* @exception NullPointerException if the specified object is null |
|
480 |
* and the field is an instance field. |
|
481 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
482 |
* by this method fails. |
|
483 |
* @see Field#get |
|
484 |
*/ |
|
485 |
public short getShort(Object obj) |
|
486 |
throws IllegalArgumentException, IllegalAccessException |
|
487 |
{ |
|
488 |
return getFieldAccessor(obj).getShort(obj); |
|
489 |
} |
|
490 |
||
491 |
/** |
|
492 |
* Gets the value of a static or instance field of type |
|
493 |
* {@code int} or of another primitive type convertible to |
|
494 |
* type {@code int} via a widening conversion. |
|
495 |
* |
|
496 |
* @param obj the object to extract the {@code int} value |
|
497 |
* from |
|
498 |
* @return the value of the field converted to type {@code int} |
|
499 |
* |
|
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|
500 |
* @exception IllegalAccessException if this {@code Field} object |
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|
501 |
* is enforcing Java language access control and the underlying |
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changeset
|
502 |
* field is inaccessible. |
2 | 503 |
* @exception IllegalArgumentException if the specified object is not |
504 |
* an instance of the class or interface declaring the |
|
505 |
* underlying field (or a subclass or implementor |
|
506 |
* thereof), or if the field value cannot be |
|
507 |
* converted to the type {@code int} by a |
|
508 |
* widening conversion. |
|
509 |
* @exception NullPointerException if the specified object is null |
|
510 |
* and the field is an instance field. |
|
511 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
512 |
* by this method fails. |
|
513 |
* @see Field#get |
|
514 |
*/ |
|
515 |
public int getInt(Object obj) |
|
516 |
throws IllegalArgumentException, IllegalAccessException |
|
517 |
{ |
|
518 |
return getFieldAccessor(obj).getInt(obj); |
|
519 |
} |
|
520 |
||
521 |
/** |
|
522 |
* Gets the value of a static or instance field of type |
|
523 |
* {@code long} or of another primitive type convertible to |
|
524 |
* type {@code long} via a widening conversion. |
|
525 |
* |
|
526 |
* @param obj the object to extract the {@code long} value |
|
527 |
* from |
|
528 |
* @return the value of the field converted to type {@code long} |
|
529 |
* |
|
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|
530 |
* @exception IllegalAccessException if this {@code Field} object |
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|
531 |
* is enforcing Java language access control and the underlying |
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diff
changeset
|
532 |
* field is inaccessible. |
2 | 533 |
* @exception IllegalArgumentException if the specified object is not |
534 |
* an instance of the class or interface declaring the |
|
535 |
* underlying field (or a subclass or implementor |
|
536 |
* thereof), or if the field value cannot be |
|
537 |
* converted to the type {@code long} by a |
|
538 |
* widening conversion. |
|
539 |
* @exception NullPointerException if the specified object is null |
|
540 |
* and the field is an instance field. |
|
541 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
542 |
* by this method fails. |
|
543 |
* @see Field#get |
|
544 |
*/ |
|
545 |
public long getLong(Object obj) |
|
546 |
throws IllegalArgumentException, IllegalAccessException |
|
547 |
{ |
|
548 |
return getFieldAccessor(obj).getLong(obj); |
|
549 |
} |
|
550 |
||
551 |
/** |
|
552 |
* Gets the value of a static or instance field of type |
|
553 |
* {@code float} or of another primitive type convertible to |
|
554 |
* type {@code float} via a widening conversion. |
|
555 |
* |
|
556 |
* @param obj the object to extract the {@code float} value |
|
557 |
* from |
|
558 |
* @return the value of the field converted to type {@code float} |
|
559 |
* |
|
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|
560 |
* @exception IllegalAccessException if this {@code Field} object |
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|
561 |
* is enforcing Java language access control and the underlying |
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changeset
|
562 |
* field is inaccessible. |
2 | 563 |
* @exception IllegalArgumentException if the specified object is not |
564 |
* an instance of the class or interface declaring the |
|
565 |
* underlying field (or a subclass or implementor |
|
566 |
* thereof), or if the field value cannot be |
|
567 |
* converted to the type {@code float} by a |
|
568 |
* widening conversion. |
|
569 |
* @exception NullPointerException if the specified object is null |
|
570 |
* and the field is an instance field. |
|
571 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
572 |
* by this method fails. |
|
573 |
* @see Field#get |
|
574 |
*/ |
|
575 |
public float getFloat(Object obj) |
|
576 |
throws IllegalArgumentException, IllegalAccessException |
|
577 |
{ |
|
578 |
return getFieldAccessor(obj).getFloat(obj); |
|
579 |
} |
|
580 |
||
581 |
/** |
|
582 |
* Gets the value of a static or instance field of type |
|
583 |
* {@code double} or of another primitive type convertible to |
|
584 |
* type {@code double} via a widening conversion. |
|
585 |
* |
|
586 |
* @param obj the object to extract the {@code double} value |
|
587 |
* from |
|
588 |
* @return the value of the field converted to type {@code double} |
|
589 |
* |
|
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|
590 |
* @exception IllegalAccessException if this {@code Field} object |
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|
591 |
* is enforcing Java language access control and the underlying |
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changeset
|
592 |
* field is inaccessible. |
2 | 593 |
* @exception IllegalArgumentException if the specified object is not |
594 |
* an instance of the class or interface declaring the |
|
595 |
* underlying field (or a subclass or implementor |
|
596 |
* thereof), or if the field value cannot be |
|
597 |
* converted to the type {@code double} by a |
|
598 |
* widening conversion. |
|
599 |
* @exception NullPointerException if the specified object is null |
|
600 |
* and the field is an instance field. |
|
601 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
602 |
* by this method fails. |
|
603 |
* @see Field#get |
|
604 |
*/ |
|
605 |
public double getDouble(Object obj) |
|
606 |
throws IllegalArgumentException, IllegalAccessException |
|
607 |
{ |
|
608 |
return getFieldAccessor(obj).getDouble(obj); |
|
609 |
} |
|
610 |
||
611 |
/** |
|
612 |
* Sets the field represented by this {@code Field} object on the |
|
613 |
* specified object argument to the specified new value. The new |
|
614 |
* value is automatically unwrapped if the underlying field has a |
|
615 |
* primitive type. |
|
616 |
* |
|
617 |
* <p>The operation proceeds as follows: |
|
618 |
* |
|
619 |
* <p>If the underlying field is static, the {@code obj} argument is |
|
620 |
* ignored; it may be null. |
|
621 |
* |
|
622 |
* <p>Otherwise the underlying field is an instance field. If the |
|
623 |
* specified object argument is null, the method throws a |
|
624 |
* {@code NullPointerException}. If the specified object argument is not |
|
625 |
* an instance of the class or interface declaring the underlying |
|
626 |
* field, the method throws an {@code IllegalArgumentException}. |
|
627 |
* |
|
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|
628 |
* <p>If this {@code Field} object is enforcing Java language access control, and |
2 | 629 |
* the underlying field is inaccessible, the method throws an |
630 |
* {@code IllegalAccessException}. |
|
631 |
* |
|
632 |
* <p>If the underlying field is final, the method throws an |
|
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|
633 |
* {@code IllegalAccessException} unless {@code setAccessible(true)} |
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changeset
|
634 |
* has succeeded for this {@code Field} object |
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changeset
|
635 |
* and the field is non-static. Setting a final field in this way |
2 | 636 |
* is meaningful only during deserialization or reconstruction of |
637 |
* instances of classes with blank final fields, before they are |
|
638 |
* made available for access by other parts of a program. Use in |
|
639 |
* any other context may have unpredictable effects, including cases |
|
640 |
* in which other parts of a program continue to use the original |
|
641 |
* value of this field. |
|
642 |
* |
|
643 |
* <p>If the underlying field is of a primitive type, an unwrapping |
|
644 |
* conversion is attempted to convert the new value to a value of |
|
645 |
* a primitive type. If this attempt fails, the method throws an |
|
646 |
* {@code IllegalArgumentException}. |
|
647 |
* |
|
648 |
* <p>If, after possible unwrapping, the new value cannot be |
|
649 |
* converted to the type of the underlying field by an identity or |
|
650 |
* widening conversion, the method throws an |
|
651 |
* {@code IllegalArgumentException}. |
|
652 |
* |
|
653 |
* <p>If the underlying field is static, the class that declared the |
|
654 |
* field is initialized if it has not already been initialized. |
|
655 |
* |
|
656 |
* <p>The field is set to the possibly unwrapped and widened new value. |
|
657 |
* |
|
658 |
* <p>If the field is hidden in the type of {@code obj}, |
|
659 |
* the field's value is set according to the preceding rules. |
|
660 |
* |
|
661 |
* @param obj the object whose field should be modified |
|
662 |
* @param value the new value for the field of {@code obj} |
|
663 |
* being modified |
|
664 |
* |
|
9022
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|
665 |
* @exception IllegalAccessException if this {@code Field} object |
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changeset
|
666 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
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diff
changeset
|
667 |
* field is either inaccessible or final. |
2 | 668 |
* @exception IllegalArgumentException if the specified object is not an |
669 |
* instance of the class or interface declaring the underlying |
|
670 |
* field (or a subclass or implementor thereof), |
|
671 |
* or if an unwrapping conversion fails. |
|
672 |
* @exception NullPointerException if the specified object is null |
|
673 |
* and the field is an instance field. |
|
674 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
675 |
* by this method fails. |
|
676 |
*/ |
|
677 |
public void set(Object obj, Object value) |
|
678 |
throws IllegalArgumentException, IllegalAccessException |
|
679 |
{ |
|
680 |
getFieldAccessor(obj).set(obj, value); |
|
681 |
} |
|
682 |
||
683 |
/** |
|
684 |
* Sets the value of a field as a {@code boolean} on the specified object. |
|
685 |
* This method is equivalent to |
|
686 |
* {@code set(obj, zObj)}, |
|
687 |
* where {@code zObj} is a {@code Boolean} object and |
|
688 |
* {@code zObj.booleanValue() == z}. |
|
689 |
* |
|
690 |
* @param obj the object whose field should be modified |
|
691 |
* @param z the new value for the field of {@code obj} |
|
692 |
* being modified |
|
693 |
* |
|
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|
694 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
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diff
changeset
|
695 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
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5506
diff
changeset
|
696 |
* field is either inaccessible or final. |
2 | 697 |
* @exception IllegalArgumentException if the specified object is not an |
698 |
* instance of the class or interface declaring the underlying |
|
699 |
* field (or a subclass or implementor thereof), |
|
700 |
* or if an unwrapping conversion fails. |
|
701 |
* @exception NullPointerException if the specified object is null |
|
702 |
* and the field is an instance field. |
|
703 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
704 |
* by this method fails. |
|
705 |
* @see Field#set |
|
706 |
*/ |
|
707 |
public void setBoolean(Object obj, boolean z) |
|
708 |
throws IllegalArgumentException, IllegalAccessException |
|
709 |
{ |
|
710 |
getFieldAccessor(obj).setBoolean(obj, z); |
|
711 |
} |
|
712 |
||
713 |
/** |
|
714 |
* Sets the value of a field as a {@code byte} on the specified object. |
|
715 |
* This method is equivalent to |
|
716 |
* {@code set(obj, bObj)}, |
|
717 |
* where {@code bObj} is a {@code Byte} object and |
|
718 |
* {@code bObj.byteValue() == b}. |
|
719 |
* |
|
720 |
* @param obj the object whose field should be modified |
|
721 |
* @param b the new value for the field of {@code obj} |
|
722 |
* being modified |
|
723 |
* |
|
9022
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|
724 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
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changeset
|
725 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
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diff
changeset
|
726 |
* field is either inaccessible or final. |
2 | 727 |
* @exception IllegalArgumentException if the specified object is not an |
728 |
* instance of the class or interface declaring the underlying |
|
729 |
* field (or a subclass or implementor thereof), |
|
730 |
* or if an unwrapping conversion fails. |
|
731 |
* @exception NullPointerException if the specified object is null |
|
732 |
* and the field is an instance field. |
|
733 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
734 |
* by this method fails. |
|
735 |
* @see Field#set |
|
736 |
*/ |
|
737 |
public void setByte(Object obj, byte b) |
|
738 |
throws IllegalArgumentException, IllegalAccessException |
|
739 |
{ |
|
740 |
getFieldAccessor(obj).setByte(obj, b); |
|
741 |
} |
|
742 |
||
743 |
/** |
|
744 |
* Sets the value of a field as a {@code char} on the specified object. |
|
745 |
* This method is equivalent to |
|
746 |
* {@code set(obj, cObj)}, |
|
747 |
* where {@code cObj} is a {@code Character} object and |
|
748 |
* {@code cObj.charValue() == c}. |
|
749 |
* |
|
750 |
* @param obj the object whose field should be modified |
|
751 |
* @param c the new value for the field of {@code obj} |
|
752 |
* being modified |
|
753 |
* |
|
9022
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|
754 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
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changeset
|
755 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
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diff
changeset
|
756 |
* field is either inaccessible or final. |
2 | 757 |
* @exception IllegalArgumentException if the specified object is not an |
758 |
* instance of the class or interface declaring the underlying |
|
759 |
* field (or a subclass or implementor thereof), |
|
760 |
* or if an unwrapping conversion fails. |
|
761 |
* @exception NullPointerException if the specified object is null |
|
762 |
* and the field is an instance field. |
|
763 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
764 |
* by this method fails. |
|
765 |
* @see Field#set |
|
766 |
*/ |
|
767 |
public void setChar(Object obj, char c) |
|
768 |
throws IllegalArgumentException, IllegalAccessException |
|
769 |
{ |
|
770 |
getFieldAccessor(obj).setChar(obj, c); |
|
771 |
} |
|
772 |
||
773 |
/** |
|
774 |
* Sets the value of a field as a {@code short} on the specified object. |
|
775 |
* This method is equivalent to |
|
776 |
* {@code set(obj, sObj)}, |
|
777 |
* where {@code sObj} is a {@code Short} object and |
|
778 |
* {@code sObj.shortValue() == s}. |
|
779 |
* |
|
780 |
* @param obj the object whose field should be modified |
|
781 |
* @param s the new value for the field of {@code obj} |
|
782 |
* being modified |
|
783 |
* |
|
9022
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diff
changeset
|
784 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
785 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
786 |
* field is either inaccessible or final. |
2 | 787 |
* @exception IllegalArgumentException if the specified object is not an |
788 |
* instance of the class or interface declaring the underlying |
|
789 |
* field (or a subclass or implementor thereof), |
|
790 |
* or if an unwrapping conversion fails. |
|
791 |
* @exception NullPointerException if the specified object is null |
|
792 |
* and the field is an instance field. |
|
793 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
794 |
* by this method fails. |
|
795 |
* @see Field#set |
|
796 |
*/ |
|
797 |
public void setShort(Object obj, short s) |
|
798 |
throws IllegalArgumentException, IllegalAccessException |
|
799 |
{ |
|
800 |
getFieldAccessor(obj).setShort(obj, s); |
|
801 |
} |
|
802 |
||
803 |
/** |
|
804 |
* Sets the value of a field as an {@code int} on the specified object. |
|
805 |
* This method is equivalent to |
|
806 |
* {@code set(obj, iObj)}, |
|
807 |
* where {@code iObj} is a {@code Integer} object and |
|
808 |
* {@code iObj.intValue() == i}. |
|
809 |
* |
|
810 |
* @param obj the object whose field should be modified |
|
811 |
* @param i the new value for the field of {@code obj} |
|
812 |
* being modified |
|
813 |
* |
|
9022
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
814 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
815 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
816 |
* field is either inaccessible or final. |
2 | 817 |
* @exception IllegalArgumentException if the specified object is not an |
818 |
* instance of the class or interface declaring the underlying |
|
819 |
* field (or a subclass or implementor thereof), |
|
820 |
* or if an unwrapping conversion fails. |
|
821 |
* @exception NullPointerException if the specified object is null |
|
822 |
* and the field is an instance field. |
|
823 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
824 |
* by this method fails. |
|
825 |
* @see Field#set |
|
826 |
*/ |
|
827 |
public void setInt(Object obj, int i) |
|
828 |
throws IllegalArgumentException, IllegalAccessException |
|
829 |
{ |
|
830 |
getFieldAccessor(obj).setInt(obj, i); |
|
831 |
} |
|
832 |
||
833 |
/** |
|
834 |
* Sets the value of a field as a {@code long} on the specified object. |
|
835 |
* This method is equivalent to |
|
836 |
* {@code set(obj, lObj)}, |
|
837 |
* where {@code lObj} is a {@code Long} object and |
|
838 |
* {@code lObj.longValue() == l}. |
|
839 |
* |
|
840 |
* @param obj the object whose field should be modified |
|
841 |
* @param l the new value for the field of {@code obj} |
|
842 |
* being modified |
|
843 |
* |
|
9022
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
844 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
845 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
846 |
* field is either inaccessible or final. |
2 | 847 |
* @exception IllegalArgumentException if the specified object is not an |
848 |
* instance of the class or interface declaring the underlying |
|
849 |
* field (or a subclass or implementor thereof), |
|
850 |
* or if an unwrapping conversion fails. |
|
851 |
* @exception NullPointerException if the specified object is null |
|
852 |
* and the field is an instance field. |
|
853 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
854 |
* by this method fails. |
|
855 |
* @see Field#set |
|
856 |
*/ |
|
857 |
public void setLong(Object obj, long l) |
|
858 |
throws IllegalArgumentException, IllegalAccessException |
|
859 |
{ |
|
860 |
getFieldAccessor(obj).setLong(obj, l); |
|
861 |
} |
|
862 |
||
863 |
/** |
|
864 |
* Sets the value of a field as a {@code float} on the specified object. |
|
865 |
* This method is equivalent to |
|
866 |
* {@code set(obj, fObj)}, |
|
867 |
* where {@code fObj} is a {@code Float} object and |
|
868 |
* {@code fObj.floatValue() == f}. |
|
869 |
* |
|
870 |
* @param obj the object whose field should be modified |
|
871 |
* @param f the new value for the field of {@code obj} |
|
872 |
* being modified |
|
873 |
* |
|
9022
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
874 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
875 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
876 |
* field is either inaccessible or final. |
2 | 877 |
* @exception IllegalArgumentException if the specified object is not an |
878 |
* instance of the class or interface declaring the underlying |
|
879 |
* field (or a subclass or implementor thereof), |
|
880 |
* or if an unwrapping conversion fails. |
|
881 |
* @exception NullPointerException if the specified object is null |
|
882 |
* and the field is an instance field. |
|
883 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
884 |
* by this method fails. |
|
885 |
* @see Field#set |
|
886 |
*/ |
|
887 |
public void setFloat(Object obj, float f) |
|
888 |
throws IllegalArgumentException, IllegalAccessException |
|
889 |
{ |
|
890 |
getFieldAccessor(obj).setFloat(obj, f); |
|
891 |
} |
|
892 |
||
893 |
/** |
|
894 |
* Sets the value of a field as a {@code double} on the specified object. |
|
895 |
* This method is equivalent to |
|
896 |
* {@code set(obj, dObj)}, |
|
897 |
* where {@code dObj} is a {@code Double} object and |
|
898 |
* {@code dObj.doubleValue() == d}. |
|
899 |
* |
|
900 |
* @param obj the object whose field should be modified |
|
901 |
* @param d the new value for the field of {@code obj} |
|
902 |
* being modified |
|
903 |
* |
|
9022
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
904 |
* @exception IllegalAccessException if this {@code Field} object |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
905 |
* is enforcing Java language access control and the underlying |
b2e8758b10fd
6543593: (reflect) Clarify private final field mutability
darcy
parents:
5506
diff
changeset
|
906 |
* field is either inaccessible or final. |
2 | 907 |
* @exception IllegalArgumentException if the specified object is not an |
908 |
* instance of the class or interface declaring the underlying |
|
909 |
* field (or a subclass or implementor thereof), |
|
910 |
* or if an unwrapping conversion fails. |
|
911 |
* @exception NullPointerException if the specified object is null |
|
912 |
* and the field is an instance field. |
|
913 |
* @exception ExceptionInInitializerError if the initialization provoked |
|
914 |
* by this method fails. |
|
915 |
* @see Field#set |
|
916 |
*/ |
|
917 |
public void setDouble(Object obj, double d) |
|
918 |
throws IllegalArgumentException, IllegalAccessException |
|
919 |
{ |
|
920 |
getFieldAccessor(obj).setDouble(obj, d); |
|
921 |
} |
|
922 |
||
923 |
// Convenience routine which performs security checks |
|
924 |
private FieldAccessor getFieldAccessor(Object obj) |
|
925 |
throws IllegalAccessException |
|
926 |
{ |
|
927 |
doSecurityCheck(obj); |
|
928 |
boolean ov = override; |
|
929 |
FieldAccessor a = (ov)? overrideFieldAccessor : fieldAccessor; |
|
930 |
return (a != null)? a : acquireFieldAccessor(ov); |
|
931 |
} |
|
932 |
||
933 |
// NOTE that there is no synchronization used here. It is correct |
|
934 |
// (though not efficient) to generate more than one FieldAccessor |
|
935 |
// for a given Field. However, avoiding synchronization will |
|
936 |
// probably make the implementation more scalable. |
|
937 |
private FieldAccessor acquireFieldAccessor(boolean overrideFinalCheck) { |
|
938 |
// First check to see if one has been created yet, and take it |
|
939 |
// if so |
|
940 |
FieldAccessor tmp = null; |
|
941 |
if (root != null) tmp = root.getFieldAccessor(overrideFinalCheck); |
|
942 |
if (tmp != null) { |
|
943 |
if (overrideFinalCheck) |
|
944 |
overrideFieldAccessor = tmp; |
|
945 |
else |
|
946 |
fieldAccessor = tmp; |
|
947 |
} else { |
|
948 |
// Otherwise fabricate one and propagate it up to the root |
|
949 |
tmp = reflectionFactory.newFieldAccessor(this, overrideFinalCheck); |
|
950 |
setFieldAccessor(tmp, overrideFinalCheck); |
|
951 |
} |
|
9029
e92fcf58f684
6565585: Remove critical section in Method.invoke, Constructor.newInstance, Field.getFieldAccessor improving performance
mduigou
parents:
9022
diff
changeset
|
952 |
|
2 | 953 |
return tmp; |
954 |
} |
|
955 |
||
956 |
// Returns FieldAccessor for this Field object, not looking up |
|
957 |
// the chain to the root |
|
958 |
private FieldAccessor getFieldAccessor(boolean overrideFinalCheck) { |
|
959 |
return (overrideFinalCheck)? overrideFieldAccessor : fieldAccessor; |
|
960 |
} |
|
961 |
||
962 |
// Sets the FieldAccessor for this Field object and |
|
963 |
// (recursively) its root |
|
964 |
private void setFieldAccessor(FieldAccessor accessor, boolean overrideFinalCheck) { |
|
965 |
if (overrideFinalCheck) |
|
966 |
overrideFieldAccessor = accessor; |
|
967 |
else |
|
968 |
fieldAccessor = accessor; |
|
969 |
// Propagate up |
|
970 |
if (root != null) { |
|
971 |
root.setFieldAccessor(accessor, overrideFinalCheck); |
|
972 |
} |
|
973 |
} |
|
974 |
||
975 |
// NOTE: be very careful if you change the stack depth of this |
|
976 |
// routine. The depth of the "getCallerClass" call is hardwired so |
|
977 |
// that the compiler can have an easier time if this gets inlined. |
|
978 |
private void doSecurityCheck(Object obj) throws IllegalAccessException { |
|
979 |
if (!override) { |
|
980 |
if (!Reflection.quickCheckMemberAccess(clazz, modifiers)) { |
|
3959
05a07c0a273b
5062288: (reflect) Core reflection uses raw types when it could be using wildcards
darcy
parents:
2174
diff
changeset
|
981 |
Class<?> caller = Reflection.getCallerClass(4); |
2 | 982 |
|
9029
e92fcf58f684
6565585: Remove critical section in Method.invoke, Constructor.newInstance, Field.getFieldAccessor improving performance
mduigou
parents:
9022
diff
changeset
|
983 |
checkAccess(caller, clazz, obj, modifiers); |
2 | 984 |
} |
985 |
} |
|
986 |
} |
|
987 |
||
988 |
/* |
|
989 |
* Utility routine to paper over array type names |
|
990 |
*/ |
|
3959
05a07c0a273b
5062288: (reflect) Core reflection uses raw types when it could be using wildcards
darcy
parents:
2174
diff
changeset
|
991 |
static String getTypeName(Class<?> type) { |
2 | 992 |
if (type.isArray()) { |
993 |
try { |
|
3959
05a07c0a273b
5062288: (reflect) Core reflection uses raw types when it could be using wildcards
darcy
parents:
2174
diff
changeset
|
994 |
Class<?> cl = type; |
2 | 995 |
int dimensions = 0; |
996 |
while (cl.isArray()) { |
|
997 |
dimensions++; |
|
998 |
cl = cl.getComponentType(); |
|
999 |
} |
|
1000 |
StringBuffer sb = new StringBuffer(); |
|
1001 |
sb.append(cl.getName()); |
|
1002 |
for (int i = 0; i < dimensions; i++) { |
|
1003 |
sb.append("[]"); |
|
1004 |
} |
|
1005 |
return sb.toString(); |
|
1006 |
} catch (Throwable e) { /*FALLTHRU*/ } |
|
1007 |
} |
|
1008 |
return type.getName(); |
|
1009 |
} |
|
1010 |
||
1011 |
/** |
|
1012 |
* @throws NullPointerException {@inheritDoc} |
|
1013 |
* @since 1.5 |
|
1014 |
*/ |
|
10342
ca0984bc9d32
7077389: Reflection classes do not build with javac -Xlint:all -Werror
jjg
parents:
9266
diff
changeset
|
1015 |
@SuppressWarnings("unchecked") |
2 | 1016 |
public <T extends Annotation> T getAnnotation(Class<T> annotationClass) { |
1017 |
if (annotationClass == null) |
|
1018 |
throw new NullPointerException(); |
|
1019 |
||
1020 |
return (T) declaredAnnotations().get(annotationClass); |
|
1021 |
} |
|
1022 |
||
1023 |
/** |
|
1024 |
* @since 1.5 |
|
1025 |
*/ |
|
1026 |
public Annotation[] getDeclaredAnnotations() { |
|
2174
0ffce164e4a4
6799230: Lazily load java.lang.annotation.Annotation class
mchung
parents:
2
diff
changeset
|
1027 |
return AnnotationParser.toArray(declaredAnnotations()); |
2 | 1028 |
} |
1029 |
||
3959
05a07c0a273b
5062288: (reflect) Core reflection uses raw types when it could be using wildcards
darcy
parents:
2174
diff
changeset
|
1030 |
private transient Map<Class<? extends Annotation>, Annotation> declaredAnnotations; |
2 | 1031 |
|
3959
05a07c0a273b
5062288: (reflect) Core reflection uses raw types when it could be using wildcards
darcy
parents:
2174
diff
changeset
|
1032 |
private synchronized Map<Class<? extends Annotation>, Annotation> declaredAnnotations() { |
2 | 1033 |
if (declaredAnnotations == null) { |
1034 |
declaredAnnotations = AnnotationParser.parseAnnotations( |
|
1035 |
annotations, sun.misc.SharedSecrets.getJavaLangAccess(). |
|
1036 |
getConstantPool(getDeclaringClass()), |
|
1037 |
getDeclaringClass()); |
|
1038 |
} |
|
1039 |
return declaredAnnotations; |
|
1040 |
} |
|
1041 |
} |