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
018package org.apache.commons.jxpath.util;
019
020import java.io.Serializable;
021import java.util.Comparator;
022
023/**
024 * Reverse comparator.
025 */
026public final class ReverseComparator implements Comparator, Serializable {
027
028    private static final long serialVersionUID = -2795475743948616649L;
029    /**
030     * Singleton reverse comparator instance.
031     */
032    public static final Comparator INSTANCE = new ReverseComparator();
033
034    /**
035     * Constructs a new ReverseComparator.
036     */
037    private ReverseComparator() {
038    }
039
040    @Override
041    public int compare(final Object o1, final Object o2) {
042        return ((Comparable) o2).compareTo(o1);
043    }
044}