code: /**
   * Copyright (c) 2004-2005, Regents of the University of California
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * Redistributions of source code must retain the above copyright notice,
   * this list of conditions and the following disclaimer.
   *
   * Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * Neither the name of the University of California, Los Angeles nor the
   * names of its contributors may be used to endorse or promote products
   * derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package avrora.gui;
  
  import avrora.sim.Simulator;
  
  /**
   * In order to speed up and slow down the simulator, we insert events
   * into the simulator queue which trigger the time changes.  These
   * events are declared here and used by <code> Avrora Gui </code> and
   * <code> ManageSimTime </code>
   * <p>
   * I believe everything about how the GUI interacts with the sim is
   * changing in the new version.  Thus, this class may just go away.
   *
   * @author UCLA Compilers Group
   */
  public class SimTimeEvents {
  
      /**
       * This PauseEvent can be inserted in the sim directly
       */
      public PauseEvent pause;
  
      /**
       * An instance of this class can be inserted into the sim
       * it will pause the sim until <code> unpause() </code> is called.
       */
      public class PauseEvent implements Simulator.Event {
          Object syncObj;
          public boolean ispaused;
  
          public PauseEvent() {
              syncObj = new Object();
              ispaused = false;
          }
  
          public void fire() {
              synchronized (syncObj) {
                  try {
                      syncObj.wait();
                  } catch (InterruptedException e) {
                      //do nothing
                  }
              }
          }
  
          public void unpause() {
              synchronized (syncObj) {
                  syncObj.notifyAll();
                  ispaused = false;
              }
          }
  
          public void pause() {
              ispaused = true;
              // TODO: fix implementation of pause
              //simpleAir.insertEvent((Simulator.Event) this, new Long(1).longValue());
          }
      }
  }
  
  