[cp-patches] Patch: FYI: LayoutQueue

[Tom Tromey]

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;
+  }
+}