/**
 * Copyright (C) 2009-2013 Barchart, Inc. <http://www.barchart.com/>
 *
 * All rights reserved. Licensed under the OSI BSD License.
 *
 * http://www.opensource.org/licenses/bsd-license.php
 */
package util;

import java.util.concurrent.atomic.AtomicBoolean;

/**
 * speed test timer
 */
public class StopWatch {

	private final AtomicBoolean isRunning = new AtomicBoolean(false);

	private long start;
	private long stop;

	public void clear() {
		start = 0;
		stop = 0;
		isRunning.set(false);
	}

	public boolean isRunning() {
		return isRunning.get();
	}

	public boolean isExceeded(final long duration) {
		return System.nanoTime() - start > duration;
	}

	public void start() {
		// if (isRunning.compareAndSet(false, true)) {
		// start = System.nanoTime(); // start timing
		// }
		start = System.nanoTime(); // start timing
	}

	public void stop() {
		// if (isRunning.compareAndSet(true, false)) {
		// stop = System.nanoTime(); // stop timing
		// }
		stop = System.nanoTime(); // stop timing
	}

	public long nanoTime() {
		return stop - start;
	}

	public String nanoString() {

		final double SECOND = 1000000000;
		final double MILLIS = 1000000;
		final double MICROS = 1000;

		final double nanoDiff = stop - start;

		final int second = (int) (nanoDiff / SECOND);

		final int millis = (int) ((nanoDiff - second * SECOND) / MILLIS);

		final int micros = (int) ((nanoDiff - second * SECOND - millis * MILLIS) / MICROS);
		final int nanos = (int) (nanoDiff - second * SECOND - millis * MILLIS - micros
				* MICROS);
		return String.format("time: %d s %d ms %d us %d ns ", second, millis,
				micros, nanos);

	}

	@Override
	public String toString() {
		return "nanoTime: " + Long.toString(nanoTime());
	}

}