FileLengthComparator


1   /*
2    * Copyright (c) 2003 - 2007 OpenSubsystems s.r.o. Slovak Republic. All rights reserved.
3    * 
4    * Project: OpenSubsystems
5    * 
6    * $Id: FileLengthComparator.java,v 1.6 2007/02/21 06:14:26 bastafidli Exp $
7    * 
8    * This program is free software; you can redistribute it and/or modify
9    * it under the terms of the GNU General Public License as published by
10   * the Free Software Foundation; version 2 of the License. 
11   * 
12   * This program is distributed in the hope that it will be useful,
13   * but WITHOUT ANY WARRANTY; without even the implied warranty of
14   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15   * GNU General Public License for more details.
16   * 
17   * You should have received a copy of the GNU General Public License
18   * along with this program; if not, write to the Free Software
19   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
20   */
21  
22  package org.opensubsystems.core.util;
23  
24  import java.io.File  ;
25  import java.util.Comparator  ;
26  
27  /**
28   * Comparator to compare length of files so that the files will be sorted from 
29   * the smallest one to the largest one.
30   * 
31   * @version $Id: FileLengthComparator.java,v 1.6 2007/02/21 06:14:26 bastafidli Exp $
32   * @author Miro Halas
33   * @code.reviewer Miro Halas
34   * @code.reviewed 1.2 2004/12/18 06:18:25 bastafidli
35   */
36  public class FileLengthComparator implements Comparator  
37  {
38     // Cached values ////////////////////////////////////////////////////////////
39     
40     /**
41      * Shared comparator instance. Must be named this way to avoid Checkstyle 
42      * warning.
43      */
44     private static Comparator   s_instance = new FileLengthComparator();
45  
46     // Public methods ///////////////////////////////////////////////////////////
47     
48     /**
49      * Get shared comparator instance.
50      *
51      * @return FileLengthComparator  - shared comparator instance
52      */
53     public static Comparator   getInstance(
54     )
55     {
56        return s_instance;
57     }
58  
59     /**
60      * Compare lengths two files represented by File Objects.
61      *
62      * @param  o1 - File #1
63      * @param  o2 - File #2
64      * @return int - -1 if o1 < o2,
65      *                0 if o1 == o2
66      *                1 if o1 > o2
67      */
68     public int compare(
69        Object   o1,
70        Object   o2
71     )
72     {
73        long lLength1 = ((File  )o1).length();
74        long lLength2 = ((File  )o2).length();
75  
76        if (lLength1 < lLength2)
77        {
78           return -1;
79        }
80        else
81        {
82           if (lLength1 == lLength2)
83           {
84              return 0;
85           }
86           else
87           {
88              return 1;
89           }
90        }
91     }
92  }
93
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