001/*
002 * The contents of this file are subject to the terms of the Common Development and
003 * Distribution License (the License). You may not use this file except in compliance with the
004 * License.
005 *
006 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
007 * specific language governing permission and limitations under the License.
008 *
009 * When distributing Covered Software, include this CDDL Header Notice in each file and include
010 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
011 * Header, with the fields enclosed by brackets [] replaced by your own identifying
012 * information: "Portions copyright [year] [name of copyright owner]".
013 *
014 * Copyright 2015-2016 ForgeRock AS.
015 */
016package org.forgerock.audit.util;
017
018import java.io.File;
019import java.util.Comparator;
020
021/**
022 * Compare two files based on file modification time.
023 */
024public class LastModifiedTimeFileComparator implements Comparator<File> {
025
026    /**
027     * Compare two files based on file modification time.
028     *
029     * @param  o1  The first file to be compared.
030     * @param  o2  The second file to be compared.
031     *
032     * @return  A negative value if the first file was the most recently modified,
033     *          a positive value if the second was the most recently modified, or
034     *          zero if there is no discernible difference between the last modify
035     *          times.
036     */
037    @Override
038    public int compare(File o1, File o2) {
039        if (o1 == o2) {
040            return 0;
041        }
042
043        if (o1.lastModified() > o2.lastModified()) {
044            return -1;
045        } else if (o1.lastModified() < o2.lastModified()) {
046            return 1;
047        } else {
048            return 0;
049        }
050    }
051}