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The source code/* * Sun Public License Notice * * The contents of this file are subject to the Sun Public License * Version 1.0 (the "License"). You may not use this file except in * compliance with the License. A copy of the License is available at * http://www.sun.com/ * * The Original Code is NetBeans. The Initial Developer of the Original * Code is Sun Microsystems, Inc. Portions Copyright 1997-2000 Sun * Microsystems, Inc. All Rights Reserved. */ package org.netbeans.modules.web.core.jsploader; /** Reference that holds a value that may expire, because it is outdated. * * @author Petr Jiricka */ public class TimeReference { private Object value; private long timestamp; /** Creates a new instance of TimeBasedCache */ public TimeReference() { value = null; timestamp = -1; } /** Returns the value, if it is still up to date. * If the value is not set, or if it is out of date, returns null. */ public synchronized Object get(long currentTimestamp) { if (currentTimestamp > timestamp) { // out of date value = null; } return value; } /** Puts the given value to the reference, * or updates the value if it already exists. As the * timestamp of the value it uses the supplied long value. */ public synchronized void put(Object value, long newTimestamp) { if (newTimestamp > timestamp) { this.timestamp = newTimestamp; this.value = value; } } } |
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