/**

 * Apple Worldwide Developer Technical Support

 *

 * Sample showing how to send and receive AppleEvents using JDirect 2.

 *

 * File: Timer.java

 *

 * A simple timer class.

 * @see TimerCallback

 *

 * @author Levi Brown

 * @author Apple Computer, Inc.

 *

 * Copyright ©1999 Apple Computer, Inc.

 * All rights reserved.

 *

 * @version 1.0

 * 4/15/1999 Shipped as 'AppleEvent Send and Receive' sample.

 *

 * You may incorporate this sample code into your applications without

 * restriction, though the sample code has been provided "AS IS" and the

 * responsibility for its operation is 100% yours.  However, what you are

 * not permitted to do is to redistribute the source as "Apple Sample

 * Code" after having made changes. If you're going to re-distribute the

 * source, we require that you make it clear in the source that the code

 * was descended from Apple Sample Code, but that you've made changes.

 */

public class Timer

{

    /**

     * Instantiates a new Timer.

     * @param the amount of time for the timer to run before calling

     * the callback (time in milliseconds).

     * @param the TimerCallback object to call when the time is up.

     */

    public Timer(int sleepTime, TimerCallback callback)

    {

        this.sleepTime = sleepTime;

        this.callback = callback;

        runObj = new RunObj();

    }

    /**

     * Starts the timer running.

     * If the timer is currently running, it will be reset.

     * @see #stop

     */

    public void start()

    {

        if (thread == null || !thread.isAlive())

        {

            thread = new Thread(runObj);

            thread.start();

        }

        else

        {

            thread.stop();

            thread = null;

            start();

        }

    }

    /**

     * Stops the timer immediately.

     * @see #start

     */

    public void stop()

    {

        thread.stop();

        thread = null;

    }

    /**

     * Simply contains the body of the running thread

     */

    class RunObj implements Runnable

    {

        public void run()

        {

            try

            {

                Thread.sleep(sleepTime);

                callback.timeIsUp();

            }

            catch (InterruptedException exc) { }

        }

    }

    protected int sleepTime;

    protected TimerCallback callback;

    protected Thread thread;

    protected RunObj runObj;

}