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/*******************************************************************************
 * Copyright (c) 2005, 2013 Oracle. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0, which accompanies this distribution
 * and is available at http://www.eclipse.org/legal/epl-v10.html.
 * 
 * Contributors:
 *     Oracle - initial API and implementation
 ******************************************************************************/
package org.eclipse.jpt.common.utility.internal.comparator;

import java.util.Comparator;
import org.eclipse.jpt.common.utility.internal.ObjectTools;

/**
 * This comparator will reverse the order of the configured comparator.
 * 
 * @param <E> the type of elements to be compared
 */
public class ReverseComparator<E>
	implements Comparator<E>
{
	private final Comparator<? super E> comparator;

	public ReverseComparator(Comparator<? super E> comparator) {
		super();
		if (comparator == null) {
			throw new NullPointerException();
		}
		this.comparator = comparator;
	}

	public int compare(E e1, E e2) {
		return this.comparator.compare(e2, e1);
	}

	@Override
	public String toString() {
		return ObjectTools.toString(this, this.comparator);
	}
}