001 /*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements. See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License. You may obtain a copy of the License at
008 *
009 * http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017 package org.apache.commons.jxpath.util;
018
019 import java.io.Serializable;
020 import java.util.Comparator;
021
022 /**
023 * Reverse comparator.
024 *
025 * @author Dmitri Plotnikov
026 * @version $Revision: 668329 $ $Date: 2008-06-16 16:59:48 -0500 (Mon, 16 Jun 2008) $
027 */
028 public final class ReverseComparator implements Comparator, Serializable {
029 private static final long serialVersionUID = -2795475743948616649L;
030
031 /**
032 * Singleton reverse comparator instance.
033 */
034 public static final Comparator INSTANCE = new ReverseComparator();
035
036 /**
037 * Create a new ReverseComparator.
038 */
039 private ReverseComparator() {
040 }
041
042 public int compare(Object o1, Object o2) {
043 return ((Comparable) o2).compareTo(o1);
044 }
045
046 }