mirror of git://gcc.gnu.org/git/gcc.git
117 lines
3.3 KiB
Java
117 lines
3.3 KiB
Java
/* LayoutQueue.java --
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package javax.swing.text;
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import java.util.LinkedList;
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/**
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* This is a queue which holds {@link Runnable} objects. It is
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* intended for deferring layout operations.
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*/
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public class LayoutQueue
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{
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// The default layout queue.
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private static LayoutQueue defaultQueue = new LayoutQueue();
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// The queue of tasks.
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private LinkedList list = new LinkedList();
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/**
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* Create a new layout queue.
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*/
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public LayoutQueue()
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{
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// Nothing to do here.
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}
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/**
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* Add a layout task to the queue.
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*/
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public void addTask(Runnable task)
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{
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synchronized (list)
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{
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list.addLast(task);
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list.notify();
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}
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}
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/**
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* Called by a worker thread to retrieve the next layout task. This
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* will block until a new task is available. This method will
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* return null if the thread is interrupted while waiting.
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*/
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protected Runnable waitForWork()
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{
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synchronized (list)
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{
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while (list.size() == 0)
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{
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try
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{
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list.wait();
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}
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catch (InterruptedException _)
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{
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// This seemed like a good idea, but it has not been
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// tested on the JDK.
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return null;
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}
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}
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return (Runnable) list.removeFirst();
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}
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}
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/**
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* Return the default layout queue.
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*/
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public static synchronized LayoutQueue getDefaultQueue()
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{
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return defaultQueue;
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}
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/**
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* Set the default layout queue.
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*/
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public static synchronized void setDefaultQueue(LayoutQueue q)
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{
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defaultQueue = q;
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}
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}
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