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A super fast inter-thread transfer queue.

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/*
 * MentaQueue => http://mentaqueue.soliveirajr.com
 * Copyright (C) 2012  Sergio Oliveira Jr. ([email protected])
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.mentaqueue.util;

public class NumberUtils {

	public final static boolean isPowerOfTwo(int n) {
		if ((n & -n) == n) {
			return true;
		} else {
			return false;
		}
	}
	
	public final static void ensurePowerOfTwo(int capacity) {
		if (!isPowerOfTwo(capacity)) {
			throw new IllegalArgumentException("Queue capacity must be a power of two: " + capacity);
		}
	}

}