/**
 * A class for timing code.
 *
 * @author	Terry Sergeant
 *
*/

public class StaticCodeTimer
{
	private static long starttime,stoptime;

	public StaticCodeTimer() { reset(); }
	public void reset() { starttime= stoptime= 0; }
	public void start() { starttime= System.currentTimeMillis(); }
	public void stop() { stoptime= System.currentTimeMillis(); }
	public long milliseconds()
	{
		if (stoptime < starttime) return 0;
		return stoptime-starttime;
	}
	public double seconds() { return milliseconds() / 1000.0; }
	public String toString()
	{
		if (starttime==0) return "timer not started";
		if (stoptime==0) stop();
		if (stoptime >= starttime)
			return String.format("%1.3f",(stoptime-starttime)/1000.0);
		else
			return "invalid timer setting";	// should never happen
	}
}