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[cp-patches] Patch: FYI: LayoutQueue
From: |
Tom Tromey |
Subject: |
[cp-patches] Patch: FYI: LayoutQueue |
Date: |
22 Aug 2005 12:59:43 -0600 |
I'm checking this in.
(Actually I checked it in earlier by mistake, but I reverted
that... this time is for real :-)
This is the simple class javax.swing.text.LayoutQueue.
Tom
Index: ChangeLog
from Tom Tromey <address@hidden>
* javax/swing/text/LayoutQueue.java: New file.
Index: javax/swing/text/LayoutQueue.java
===================================================================
RCS file: javax/swing/text/LayoutQueue.java
diff -N javax/swing/text/LayoutQueue.java
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ javax/swing/text/LayoutQueue.java 22 Aug 2005 19:00:39 -0000
@@ -0,0 +1,115 @@
+/* LayoutQueue.java --
+ Copyright (C) 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library. Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module. An independent module is a module which is not derived from
+or based on this library. If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so. If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package javax.swing.text;
+
+import java.util.LinkedList;
+
+/**
+ * This is a queue which holds address@hidden Runnable} objects. It is
+ * intended for deferring layout operations.
+ */
+public class LayoutQueue
+{
+ // The default layout queue.
+ private static LayoutQueue defaultQueue = new LayoutQueue();
+
+ // The queue of tasks.
+ private LinkedList list = new LinkedList();
+
+ /**
+ * Create a new layout queue.
+ */
+ public LayoutQueue()
+ {
+ }
+
+ /**
+ * Add a layout task to the queue.
+ */
+ public void addTask(Runnable task)
+ {
+ synchronized (list)
+ {
+ list.addLast(task);
+ list.notify();
+ }
+ }
+
+ /**
+ * Called by a worker thread to retrieve the next layout task. This
+ * will block until a new task is available. This method will
+ * return null if the thread is interrupted while waiting.
+ */
+ protected Runnable waitForWork()
+ {
+ synchronized (list)
+ {
+ while (list.size() == 0)
+ {
+ try
+ {
+ list.wait();
+ }
+ catch (InterruptedException _)
+ {
+ // This seemed like a good idea, but it has not been
+ // tested on the JDK.
+ return null;
+ }
+ }
+ return (Runnable) list.removeFirst();
+ }
+ }
+
+ /**
+ * Return the default layout queue.
+ */
+ public static synchronized LayoutQueue getDefaultQueue()
+ {
+ return defaultQueue;
+ }
+
+ /**
+ * Set the default layout queue.
+ */
+ public static synchronized void setDefaultQueue(LayoutQueue q)
+ {
+ defaultQueue = q;
+ }
+}
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