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    }