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.sim.util;
  
  import avrora.sim.Simulator;
  import avrora.sim.State;
  
  /**
   * The <code>MulticastProbe</code> is a wrapper around multiple watches that allows them to act as a single
   * watch. It is useful for composing multiple watches into one and is used internally in the simulator.
   *
   * @author Ben L. Titzer
   * @see Simulator
   */
  public class MulticastWatch extends TransactionalList implements Simulator.Watch {
  
      /**
       * The <code>fireBeforeRead()</code> method is called before the probed address is read by the program. In
       * the implementation of the multicast probe, it simply calls the <code>fireBeforeRead()</code> method on
       * each of the probes in the multicast set in the order in which they were inserted.
       *
       * @param state   the state of the simulation
       */
      public void fireBeforeRead(State state, int data_addr) {
          beginTransaction();
          for (Link pos = head; pos != null; pos = pos.next)
              ((Simulator.Watch)pos.object).fireBeforeRead(state, data_addr);
      }
  
      /**
       * The <code>fireAfterRead()</code> method is called after the probed address is read by the program. In
       * the implementation of the multicast probe, it simply calls the <code>fireAfterRead()</code> method on
       * each of the probes in the multicast set in the order in which they were inserted.
       *
       * @param state   the state of the simulation
       * @param val     the value of the memory location being read
       */
      public void fireAfterRead(State state, int data_addr, byte val) {
          for (Link pos = head; pos != null; pos = pos.next)
              ((Simulator.Watch)pos.object).fireAfterRead(state, data_addr, val);
          endTransaction();
      }
  
      /**
       * The <code>fireBeforeWrite()</code> method is called before the probed address is written by the
       * program. In the implementation of the multicast probe, it simply calls the
       * <code>fireBeforeWrite()</code> method on each of the probes in the multicast set in the order in which
       * they were inserted.
       *
       * @param state   the state of the simulation
       * @param val     the value being written to the memory location
       */
      public void fireBeforeWrite(State state, int data_addr, byte val) {
          beginTransaction();
          for (Link pos = head; pos != null; pos = pos.next)
              ((Simulator.Watch)pos.object).fireBeforeWrite(state, data_addr, val);
      }
  
      /**
       * The <code>fireAfterWrite()</code> method is called after the probed address is written by the program.
       * In the implementation of the multicast probe, it simply calls the <code>fireAfterWrite()</code> method
       * on each of the probes in the multicast set in the order in which they were inserted.
       *
       * @param state   the state of the simulation
       * @param val     the value being written to the memory location
       */
      public void fireAfterWrite(State state, int data_addr, byte val) {
          for (Link pos = head; pos != null; pos = pos.next)
              ((Simulator.Watch)pos.object).fireAfterWrite(state, data_addr, val);
          endTransaction();
      }
  
  
  }
  