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/*******************************************************************************
* Copyright (c) 2005, 2008 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.utility.internal;
import java.io.Serializable;
import java.util.Comparator;
/**
* This comparator will reverse the order of the specified comparator.
* If the comparator is null, the natural ordering of the objects will be used.
*/
public class ReverseComparator<E extends Comparable<? super E>>
implements Comparator<E>, Serializable
{
private final Comparator<E> comparator;
public ReverseComparator() {
this(null);
}
public ReverseComparator(Comparator<E> comparator) {
super();
this.comparator = comparator;
}
public int compare(E e1, E e2) {
return (this.comparator == null) ?
e2.compareTo(e1)
:
this.comparator.compare(e2, e1);
}
}
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