1   /**
2    * Copyright (c) 2000-2009 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 com.liferay.portal.kernel.log.Log;
26  import com.liferay.portal.kernel.log.LogFactoryUtil;
27  
28  import java.lang.reflect.InvocationTargetException;
29  
30  import java.util.Comparator;
31  
32  import org.apache.commons.beanutils.PropertyUtils;
33  
34  /**
35   * <a href="PropertyComparator.java.html"><b><i>View Source</i></b></a>
36   *
37   * @author Patrick Brady
38   * @author Raymond Augé
39   *
40   */
41  public class PropertyComparator implements Comparator {
42  
43      public PropertyComparator(String propertyName) {
44          this(new String[] {propertyName}, true, false);
45      }
46  
47      public PropertyComparator(String[] propertyNames) {
48          this(propertyNames, true, false);
49      }
50  
51      public PropertyComparator(
52          String propertyName, boolean asc, boolean caseSensitive) {
53  
54          this(new String[] {propertyName}, asc, caseSensitive);
55      }
56  
57      public PropertyComparator(
58          String[] propertyNames, boolean asc, boolean caseSensitive) {
59  
60          _propertyNames = propertyNames;
61          _asc = asc;
62          _caseSensitive = caseSensitive;
63      }
64  
65      public int compare(Object obj1, Object obj2) {
66          try {
67              for (String propertyName : _propertyNames) {
68                  Object property1 = PropertyUtils.getProperty(
69                      obj1, propertyName);
70                  Object property2 = PropertyUtils.getProperty(
71                      obj2, propertyName);
72  
73                  if (!_asc) {
74                      Object temp = property1;
75  
76                      property1 = property2;
77                      property2 = temp;
78                  }
79  
80                  if (property1 instanceof String) {
81                      int result = 0;
82  
83                      if (_caseSensitive) {
84                          result = property1.toString().compareTo(
85                              property2.toString());
86                      }
87                      else {
88                          result = property1.toString().compareToIgnoreCase(
89                              property2.toString());
90                      }
91  
92                      if (result != 0) {
93                          return result;
94                      }
95                  }
96  
97                  if (property1 instanceof Comparable) {
98                      int result = ((Comparable)property1).compareTo(property2);
99  
100                     if (result != 0) {
101                         return result;
102                     }
103                 }
104             }
105         }
106         catch (IllegalAccessException iae) {
107             _log.error(iae.getMessage());
108         }
109         catch (InvocationTargetException ite) {
110             _log.error(ite.getMessage());
111         }
112         catch (NoSuchMethodException nsme) {
113             _log.error(nsme.getMessage());
114         }
115 
116         return -1;
117     }
118 
119     private static Log _log = LogFactoryUtil.getLog(PropertyComparator.class);
120 
121     private String[] _propertyNames;
122     private boolean _asc;
123     private boolean _caseSensitive;
124 
125 }