1   /**
2    * Copyright (c) 2000-2008 Liferay, Inc. All rights reserved.
3    *
4    * Permission is hereby granted, free of charge, to any person obtaining a copy
5    * of this software and associated documentation files (the "Software"), to deal
6    * in the Software without restriction, including without limitation the rights
7    * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
8    * copies of the Software, and to permit persons to whom the Software is
9    * furnished to do so, subject to the following conditions:
10   *
11   * The above copyright notice and this permission notice shall be included in
12   * all copies or substantial portions of the Software.
13   *
14   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
19   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
20   * SOFTWARE.
21   */
22  
23  package com.liferay.portal.kernel.util;
24  
25  import java.io.Serializable;
26  
27  import java.util.Comparator;
28  
29  /**
30   * <a href="StringComparator.java.html"><b><i>View Source</i></b></a>
31   *
32   * @author Brian Wing Shun Chan
33   *
34   */
35  public class StringComparator implements Comparator<String>, Serializable {
36  
37      public StringComparator() {
38          this(true, false);
39      }
40  
41      public StringComparator(boolean asc, boolean caseSensitive) {
42          _asc = asc;
43          _caseSensitive = caseSensitive;
44      }
45  
46      public int compare(String s1, String s2) {
47          if (s1 == null) {
48              s1 = StringPool.BLANK;
49          }
50  
51          if (s2 == null) {
52              s2 = StringPool.BLANK;
53          }
54  
55          if (!_asc) {
56              String temp = s1;
57  
58              s1 = s2;
59              s2 = temp;
60          }
61  
62          if (_caseSensitive) {
63              return s1.compareTo(s2);
64          }
65          else {
66              return s1.compareToIgnoreCase(s2);
67          }
68      }
69  
70      private boolean _asc;
71      private boolean _caseSensitive;
72  
73  }