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.util;
24  
25  import java.lang.reflect.InvocationTargetException;
26  
27  import java.util.Comparator;
28  
29  import org.apache.commons.beanutils.PropertyUtils;
30  import org.apache.commons.logging.Log;
31  import org.apache.commons.logging.LogFactory;
32  
33  /**
34   * <a href="PropertyComparator.java.html"><b><i>View Source</i></b></a>
35   *
36   * @author Patrick Brady
37   * @author Raymond Augé
38   *
39   */
40  public class PropertyComparator implements Comparator {
41  
42      public PropertyComparator(String propertyName) {
43          this(new String[] {propertyName}, true, false);
44      }
45  
46      public PropertyComparator(String[] propertyNames) {
47          this(propertyNames, true, false);
48      }
49  
50      public PropertyComparator(
51          String propertyName, boolean asc, boolean caseSensitive) {
52  
53          this(new String[] {propertyName}, asc, caseSensitive);
54      }
55  
56      public PropertyComparator(
57          String[] propertyNames, boolean asc, boolean caseSensitive) {
58  
59          _propertyNames = propertyNames;
60          _asc = asc;
61          _caseSensitive = caseSensitive;
62      }
63  
64      public int compare(Object obj1, Object obj2) {
65          try {
66              for (String propertyName : _propertyNames) {
67                  Object property1 = PropertyUtils.getProperty(
68                      obj1, propertyName);
69                  Object property2 = PropertyUtils.getProperty(
70                      obj2, propertyName);
71  
72                  if (!_asc) {
73                      Object temp = property1;
74  
75                      property1 = property2;
76                      property2 = temp;
77                  }
78  
79                  if (property1 instanceof String) {
80                      int result = 0;
81  
82                      if (_caseSensitive) {
83                          result = property1.toString().compareTo(
84                              property2.toString());
85                      }
86                      else {
87                          result = property1.toString().compareToIgnoreCase(
88                              property2.toString());
89                      }
90  
91                      if (result != 0) {
92                          return result;
93                      }
94                  }
95  
96                  if (property1 instanceof Comparable) {
97                      int result = ((Comparable)property1).compareTo(property2);
98  
99                      if (result != 0) {
100                         return result;
101                     }
102                 }
103             }
104         }
105         catch (IllegalAccessException iae) {
106             _log.error(iae.getMessage());
107         }
108         catch (InvocationTargetException ite) {
109             _log.error(ite.getMessage());
110         }
111         catch (NoSuchMethodException nsme) {
112             _log.error(nsme.getMessage());
113         }
114 
115         return -1;
116     }
117 
118     private static Log _log = LogFactory.getLog(PropertyComparator.class);
119 
120     private String[] _propertyNames;
121     private boolean _asc;
122     private boolean _caseSensitive;
123 
124 }