/*!
* This program is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software
* Foundation.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2002-2013 Pentaho Corporation..  All rights reserved.
*/

package org.pentaho.reporting.libraries.base.util;

import java.io.Closeable;

public class StopWatch implements Closeable {
  private long elapsedTime;
  private long startTime;
  private boolean started;

  public StopWatch() {
  }

  public static StopWatch startNew() {
    final StopWatch stopWatch = new StopWatch();
    stopWatch.start();
    return stopWatch;
  }

  public void start() {
    if ( started ) {
      return;
    }

    startTime = System.nanoTime();
    started = true;
  }

  public void reset() {
    elapsedTime = 0;
    startTime = System.nanoTime();
  }

  public void stop() {
    if ( started == false ) {
      return;
    }

    started = false;
    elapsedTime += ( System.nanoTime() - startTime );
  }

  public long getElapsedTime() {
    if ( started ) {
      return elapsedTime + ( System.nanoTime() - startTime );
    }
    return elapsedTime;
  }

  public double getElapsedMilliseconds() {
    return getElapsedTime() / 1000000.0f;
  }

  public double getElapsedSeconds() {
    return getElapsedTime() / 1000000000.0f;
  }

  public String toString() {
    return "StopWatch={elapsedTimeInSeconds=" + getElapsedSeconds() + "}";
  }

  public long getStartTime() {
    return startTime;
  }

  public double getStartMilliseconds() {
    return getStartTime() / 1000000.0f;
  }

  public boolean isStarted() {
    return started;
  }

  public void close() {
    stop();
  }
}