jdk/src/share/classes/sun/reflect/UnsafeQualifiedFieldAccessorImpl.java
author duke
Sat, 01 Dec 2007 00:00:00 +0000
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/*
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 * Copyright 2004 Sun Microsystems, Inc.  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.  Sun designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 */
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package sun.reflect;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import sun.misc.Unsafe;
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/**
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 * Base class for sun.misc.Unsafe-based FieldAccessors for fields with
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 * final or volatile qualifiers. These differ from unqualified
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 * versions in that (1) they check for read-only status (2) they use
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 * the volatile forms of Unsafe get/put methods. (When accessed via
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 * reflection, finals act as slightly "lighter" forms of volatiles. So
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 * the volatile forms are heavier than necessary in terms of
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 * underlying reordering rules and memory barriers, but preserve
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 * correctness.)
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 */
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abstract class UnsafeQualifiedFieldAccessorImpl
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    extends UnsafeFieldAccessorImpl
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{
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    protected final boolean isReadOnly;
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    UnsafeQualifiedFieldAccessorImpl(Field field, boolean isReadOnly) {
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        super(field);
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        this.isReadOnly = isReadOnly;
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    }
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}