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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.databene.commons.comparator;
import java.util.Comparator;
import org.databene.commons.ComparableComparator;
/**
* Reverts the result of another Comparator.
* Use this for sorting in descending order.
* Created: 19.06.2005 18:26:47
* @param the type of objects to be compared
* @author Volker Bergmann
*/
public class ReverseComparator implements Comparator {
private Comparator subject;
@SuppressWarnings("unchecked")
public ReverseComparator() {
this((Comparator)new ComparableComparator>());
}
public ReverseComparator(Comparator subject) {
this.subject = subject;
}
@Override
public int compare(E o1, E o2) {
return (- subject.compare(o1, o2));
}
}