1   /**
2    * Copyright (c) 2000-2010 Liferay, Inc. All rights reserved.
3    *
4    * This library is free software; you can redistribute it and/or modify it under
5    * the terms of the GNU Lesser General Public License as published by the Free
6    * Software Foundation; either version 2.1 of the License, or (at your option)
7    * any later version.
8    *
9    * This library is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11   * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
12   * details.
13   */
14  
15  package com.liferay.portal.kernel.util;
16  
17  import java.io.Serializable;
18  
19  import java.util.Comparator;
20  
21  /**
22   * <a href="StringComparator.java.html"><b><i>View Source</i></b></a>
23   *
24   * @author Brian Wing Shun Chan
25   */
26  public class StringComparator implements Comparator<String>, Serializable {
27  
28      public StringComparator() {
29          this(true, false);
30      }
31  
32      public StringComparator(boolean asc, boolean caseSensitive) {
33          _asc = asc;
34          _caseSensitive = caseSensitive;
35      }
36  
37      public int compare(String s1, String s2) {
38          if (s1 == null) {
39              s1 = StringPool.BLANK;
40          }
41  
42          if (s2 == null) {
43              s2 = StringPool.BLANK;
44          }
45  
46          if (!_asc) {
47              String temp = s1;
48  
49              s1 = s2;
50              s2 = temp;
51          }
52  
53          if (_caseSensitive) {
54              return s1.compareTo(s2);
55          }
56          else {
57              return s1.compareToIgnoreCase(s2);
58          }
59      }
60  
61      private boolean _asc;
62      private boolean _caseSensitive;
63  
64  }