// package timer;
import java.util.*;

/**
 * timer class
 * realize stop-watch function 
   This timer seems to do millisecond accurate timings 
 * 
 * @version 0.1
 * @author S.Honda
 */
public class timer {
  private Calendar cal;
  private Calendar origin;
  private Calendar stop;

  public timer() {
    String[] ids = TimeZone.getAvailableIDs(9 * 60 * 60 * 1000);
    if (ids.length == 0) {
      System.err.println( "can not get available timezone" );
      return;
    }
    SimpleTimeZone pdt = new SimpleTimeZone(9 * 60 * 60 * 1000, ids[0]);
    cal = new GregorianCalendar(pdt);
  }
  public void reset() {
    origin = cal.getInstance();
  }
  public void stop() {
    stop = cal.getInstance();
  }
  public void display( Calendar c ) {
    System.out.println( "" + c.get(Calendar.HOUR) +":"+ c.get(Calendar.MINUTE) + ":" + c.get(Calendar.SECOND) + ":" + c.get(Calendar.MILLISECOND) );
  }

  long toMilliSecond( Calendar c ) {
    long ret = (long)c.get(Calendar.HOUR) * 60L * 60L *1000L +
          (long)c.get(Calendar.MINUTE) *60L *1000L +
          (long)c.get(Calendar.SECOND) * 1000L +
          (long)c.get(Calendar.MILLISECOND);
    return ret;
  }
  public long getDiff() {
    long o = toMilliSecond( origin );
    long s = toMilliSecond( stop );
    return ( s - o );
  }
/*  public static void main ( String[] args ) {
    timer t = new timer();
    t.reset();
*/
/* make it do about 3.6 seconds worth of work on my 200 mhz
 * pentium. Or about 23.2 seconds worth on my sun sparc lx.
 */
 /*   int j = 1;
    for (int i = 0; i < 100000; i++)
       for(int k = 0; k < 100; k++)
          j = j * j;
    t.stop();
    System.out.println( "the time difference is " + t.getDiff() );
  } */
}