1   /**
2    * Copyright (c) 2000-2007 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   *
38   */
39  public class PropertyComparator implements Comparator {
40  
41      public PropertyComparator(String propertyName) {
42          _propertyNames = new String[]{propertyName};
43      }
44  
45      public PropertyComparator(String[] propertyNames) {
46          _propertyNames = propertyNames;
47      }
48  
49      public int compare(Object obj1, Object obj2) {
50          try {
51              for (int i = 0; i < _propertyNames.length; i++) {
52                  String propertyName = _propertyNames[i];
53  
54                  Object property1 =
55                      PropertyUtils.getProperty(obj1, propertyName);
56                  Object property2 =
57                      PropertyUtils.getProperty(obj2, propertyName);
58  
59                  if (property1 instanceof String) {
60                      int result = property1.toString().compareToIgnoreCase(
61                          property2.toString());
62  
63                      if (result != 0) {
64                          return result;
65                      }
66                  }
67  
68                  if (property1 instanceof Comparable) {
69                      int result = ((Comparable)property1).compareTo(property2);
70  
71                      if (result != 0) {
72                          return result;
73                      }
74                  }
75              }
76          }
77          catch (IllegalAccessException iae) {
78              _log.error(iae.getMessage());
79          }
80          catch (InvocationTargetException ite) {
81              _log.error(ite.getMessage());
82          }
83          catch (NoSuchMethodException nsme) {
84              _log.error(nsme.getMessage());
85          }
86  
87          return -1;
88      }
89  
90      private static Log _log = LogFactory.getLog(PropertyComparator.class);
91  
92      private String[] _propertyNames;
93  
94  }