content: /*
   * Created on Oct 31, 2007
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
   * the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
   * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
   * specific language governing permissions and limitations under the License.
   *
   * Copyright @2007-2013 the original author or authors.
   */
  package org.fest.swing.test.util;
  
  import static java.lang.System.currentTimeMillis;
  
  /**
   * @author Yvonne Wang
   */
  public final class StopWatch {
    private boolean started;
    private boolean stopped;
    private long startTime;
    private long endTime;
  
    public static StopWatch startNewStopWatch() {
      StopWatch stopWatch = new StopWatch();
      stopWatch.start();
      return stopWatch;
    }
  
    public void start() {
      started = true;
      stopped = false;
      startTime = currentTimeMillis();
      endTime = 0;
    }
  
    public void stop() {
      stopped = true;
      endTime = currentTimeMillis();
    }
  
    public long ellapsedTime() {
      if (!started) {
        throw new IllegalStateException("stopwatch has not been started");
      }
      if (!stopped) {
        throw new IllegalStateException("stopwatch has not been stopped");
      }
      return endTime - startTime;
    }
  }
  