65 lines
2.1 KiB
Java
65 lines
2.1 KiB
Java
/*
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* Copyright (c) 2011, 2018, 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.
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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 gc.gctests.PhantomReference;
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import java.lang.ref.PhantomReference;
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import java.lang.ref.ReferenceQueue;
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/**
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* Helper class that extends PhantomReference, that we can use
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* to match the hash code for the referent object.
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*/
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public final class PRHelper extends PhantomReference {
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private int referentHashCode;
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/**
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* Constructor for extended PhantomReference class.
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*
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* @param o Referred object
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* @param referenceQueue Reference queue to attach the PR to
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*/
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public PRHelper(Object o, ReferenceQueue referenceQueue) {
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super(o, referenceQueue);
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referentHashCode = -1;
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}
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/**
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* Get the referred objects hash code.
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*
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* @return Hash code for referred object
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*/
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public int getReferentHashCode() {
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return referentHashCode;
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}
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/**
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* Set the original referred objects hash code for tracking.
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*
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* @param referentHashCode New hash code
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*/
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public void setReferentHashCode(int referentHashCode) {
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this.referentHashCode = referentHashCode;
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}
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}
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