PasswordGenerator


1   /* ===============================================================================
2    *
3    * Part of the InfoGlue Content Management Platform (www.infoglue.org)
4    *
5    * ===============================================================================
6    *
7    *  Copyright (C)
8    * 
9    * This program is free software; you can redistribute it and/or modify it under
10   * the terms of the GNU General Public License version 2, as published by the
11   * Free Software Foundation. See the file LICENSE.html for more information.
12   * 
13   * This program is distributed in the hope that it will be useful, but WITHOUT
14   * ANY WARRANTY, including the implied warranty of MERCHANTABILITY or FITNESS
15   * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
16   * 
17   * You should have received a copy of the GNU General Public License along with
18   * this program; if not, write to the Free Software Foundation, Inc. / 59 Temple
19   * Place, Suite 330 / Boston, MA 02111-1307 / USA.
20   *
21   * ===============================================================================
22   */
23  
24  package org.infoglue.cms.util;
25  
26  import java.util.Random  ;
27  
28  
29  /**
30   * Utility class for generating passwords.
31   *
32   * @author <a HREF="mailto:meat_for_the_butcher@yahoo.com">Patrik Nyborg</a>
33   */
34  
35  public class PasswordGenerator 
36  {
37    // --- [Constants] -----------------------------------------------------------
38  
39    /**
40     * We want to have a random string with a length of 10 characters.
41     * Since we encode it base-36, we modulo the random number with this value.
42     */
43  
44      private static final long MAX_RANDOM_LENGTH = 3656158440062976L; // 36 ** 10
45  
46  
47  
48    // --- [Attributes] ----------------------------------------------------------
49  
50    // Used for generating a stream of pseudorandom numbers.
51    private static final Random   random = new Random  ();
52  
53  
54  
55    // --- [Static] --------------------------------------------------------------
56    // --- [Constructors] --------------------------------------------------------
57  
58    /**
59     * Static class; don't allow instantiation.
60     */
61    private PasswordGenerator() {}
62  
63  
64  
65    // --- [Public] --------------------------------------------------------------
66   
67    /**
68     * Generates a random 10 characters password.
69     *
70     * @return the generated password.
71     */
72    public static synchronized String   generate() 
73    {
74      return Long.toString(Math.abs(random.nextLong()) % MAX_RANDOM_LENGTH, Character.MAX_RADIX);
75    }
76  
77  
78  
79    // --- [X implementation] ----------------------------------------------------
80    // --- [X Overrides] ---------------------------------------------------------
81    // --- [Package protected] ---------------------------------------------------
82    // --- [Private] -------------------------------------------------------------
83    // --- [Protected] -----------------------------------------------------------
84    // --- [Inner classes] -------------------------------------------------------
85  }
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