StopWatch.java

/*
   JMeld is a visual diff and merge tool.
   Copyright (C) 2007  Kees Kuip
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
   This library 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
   Lesser General Public License for more details.
   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA  02110-1301  USA
 */
package org.jmeld.util;

public class StopWatch
{
  private long startTime;
  private long stopTime;
  private boolean running;

  public StopWatch()
  {
    reset();
  }

  public StopWatch start()
  {
    startTime = System.currentTimeMillis();
    running = true;
    return this;
  }

  public StopWatch stop()
  {
    stopTime = System.currentTimeMillis();
    running = false;
    return this;
  }

  public long getElapsedTime()
  {
    if (startTime == -1)
    {
      return 0;
    }

    if (running)
    {
      return System.currentTimeMillis() - startTime;
    }
    else
    {
      return stopTime - startTime;
    }
  }

  public StopWatch reset()
  {
    startTime = -1;
    stopTime = -1;
    running = false;
    return this;
  }
}