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.platform.sensors;
  
  import avrora.Main;
  import avrora.sim.Simulator;
  import avrora.sim.clock.Clock;
  import avrora.sim.mcu.Microcontroller;
  import cck.util.Util;
  import java.io.*;
  
  /**
   * The <code>ReplaySensorData</code> class implements a sensor data source that replays
   * the sensor data from a file.
   *
   * @author Ben L. Titzer
   */
  public class ReplaySensorData implements SensorData {
  
      final Clock clock;
      final File file;
      final FileReader fr;
      final StreamTokenizer st;
      final ChangeReading change;
      int currentReading;
  
      public ReplaySensorData(Microcontroller m, String fn) throws IOException {
          clock = m.getClockDomain().getMainClock();
          Main.checkFileExists(fn);
          file = new File (fn);
          fr = new FileReader(file);
          st = new StreamTokenizer(fr);
          change = new ChangeReading();
          getNextReading();
          scheduleNextChange();
      }
  
      private void getNextReading() throws IOException {
          int tt = st.nextToken();
          if ( tt == StreamTokenizer.TT_EOF ) return;
          if ( tt != StreamTokenizer.TT_NUMBER )
              throw Util.failure("sensor data format error: expected number as sensor reading");
          currentReading = (int)st.nval & 0x3ff;
      }
  
      class ChangeReading implements Simulator.Event {
          public void fire() {
              try {
                  getNextReading();
                  scheduleNextChange();
              } catch (IOException e) {
                  throw Util.unexpected(e);
              }
          }
      }
  
      private void scheduleNextChange() throws IOException {
          int tt = st.nextToken();
          if ( tt == StreamTokenizer.TT_EOF ) return;
          if ( tt != StreamTokenizer.TT_NUMBER )
              throw Util.failure("sensor data format error: expected number as time value");
          clock.insertEvent(change, (long)(st.nval * clock.getHZ()));
      }
  
      public int reading() {
          return currentReading;
      }
  }
  