001 /*--------------------------------------------------------------------------+ 002 $Id: InvertingComparator.java 26283 2010-02-18 11:18:57Z juergens $ 003 | | 004 | Copyright 2005-2010 Technische Universitaet Muenchen | 005 | | 006 | Licensed under the Apache License, Version 2.0 (the "License"); | 007 | you may not use this file except in compliance with the License. | 008 | You may obtain a copy of the License at | 009 | | 010 | http://www.apache.org/licenses/LICENSE-2.0 | 011 | | 012 | Unless required by applicable law or agreed to in writing, software | 013 | distributed under the License is distributed on an "AS IS" BASIS, | 014 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 015 | See the License for the specific language governing permissions and | 016 | limitations under the License. | 017 +--------------------------------------------------------------------------*/ 018 package edu.tum.cs.commons.collections; 019 020 import java.util.Comparator; 021 022 /** 023 * This works on another compartor and inverts it. 024 * 025 * 026 * @author Florian Deissenboeck 027 * @author $Author: juergens $ 028 * @version $Rev: 26283 $ 029 * @levd.rating GREEN Hash: 01BC540BD434B1257367A856516E7F2E 030 */ 031 public class InvertingComparator<E> implements Comparator<E> { 032 033 /** The underlying comparator */ 034 private final Comparator<? super E> comparator; 035 036 /** 037 * Create a new <code>InvertingComparator</code>. 038 * 039 * @param comparator 040 * the comparator to invert. 041 */ 042 public InvertingComparator(Comparator<? super E> comparator) { 043 this.comparator = comparator; 044 } 045 046 /** 047 * Compares to objects with the orginal comparator and inverts the result. * 048 */ 049 public int compare(E object1, E object2) { 050 return -1 * comparator.compare(object1, object2); 051 } 052 053 }