1 /*

     2  * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.  Oracle designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

    11  * This code is distributed in the hope that it will be useful, but WITHOUT

    12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    14  * version 2 for more details (a copy is included in the LICENSE file that

    15  * accompanied this code).

    16  *

    17  * You should have received a copy of the GNU General Public License version

    18  * 2 along with this work; if not, write to the Free Software Foundation,

    19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 

    26 package sun.reflect;

    27 

    28 import java.lang.reflect.Field;

    29 import java.lang.reflect.Modifier;

    30 import jdk.internal.misc.Unsafe;

    31 

    32 /**

    33  * Base class for jdk.internal.misc.Unsafe-based FieldAccessors for fields with

    34  * final or volatile qualifiers. These differ from unqualified

    35  * versions in that (1) they check for read-only status (2) they use

    36  * the volatile forms of Unsafe get/put methods. (When accessed via

    37  * reflection, finals act as slightly "lighter" forms of volatiles. So

    38  * the volatile forms are heavier than necessary in terms of

    39  * underlying reordering rules and memory barriers, but preserve

    40  * correctness.)

    41  */

    42 

    43 abstract class UnsafeQualifiedFieldAccessorImpl

    44     extends UnsafeFieldAccessorImpl

    45 {

    46     protected final boolean isReadOnly;

    47 

    48     UnsafeQualifiedFieldAccessorImpl(Field field, boolean isReadOnly) {

    49         super(field);

    50         this.isReadOnly = isReadOnly;

    51     }

    52 }