001    /*
002     * CDDL HEADER START
003     *
004     * The contents of this file are subject to the terms of the
005     * Common Development and Distribution License, Version 1.0 only
006     * (the "License").  You may not use this file except in compliance
007     * with the License.
008     *
009     * You can obtain a copy of the license at
010     * trunk/opends/resource/legal-notices/OpenDS.LICENSE
011     * or https://OpenDS.dev.java.net/OpenDS.LICENSE.
012     * See the License for the specific language governing permissions
013     * and limitations under the License.
014     *
015     * When distributing Covered Code, include this CDDL HEADER in each
016     * file and include the License file at
017     * trunk/opends/resource/legal-notices/OpenDS.LICENSE.  If applicable,
018     * add the following below this CDDL HEADER, with the fields enclosed
019     * by brackets "[]" replaced with your own identifying information:
020     *      Portions Copyright [yyyy] [name of copyright owner]
021     *
022     * CDDL HEADER END
023     *
024     *
025     *      Copyright 2006-2008 Sun Microsystems, Inc.
026     */
027    package org.opends.server.loggers;
028    
029    import java.io.File;
030    import java.util.Comparator;
031    
032    
033    
034    
035    /**
036     * This class implements a comparator that can compare two files based on the
037     * time that they were last modified.
038     */
039    public class FileComparator implements Comparator<File>
040    {
041      /**
042       * Compare two files based on file modification time.
043       *
044       * @param  o1  The first file to be compared.
045       * @param  o2  The second file to be compared.
046       *
047       * @return  A negative value if the first file was the most recently modified,
048       *          a positive value if the second was the most recently modified, or
049       *          zero if there is no discernible difference between the last modify
050       *          times.
051       */
052      public int compare(File o1, File o2)
053      {
054        if(o1 == o2)
055        {
056          return 0;
057        }
058    
059        if (o1.lastModified() > o2.lastModified())
060        {
061          return -1;
062        } else if (o1.lastModified() < o2.lastModified())
063        {
064          return 1;
065        } else
066        {
067          return 0;
068        }
069      }
070    
071    }
072