1   /**
2    * Copyright (c) 2000-2009 Liferay, Inc. All rights reserved.
3    *
4    *
5    *
6    *
7    * The contents of this file are subject to the terms of the Liferay Enterprise
8    * Subscription License ("License"). You may not use this file except in
9    * compliance with the License. You can obtain a copy of the License by
10   * contacting Liferay, Inc. See the License for the specific language governing
11   * permissions and limitations under the License, including but not limited to
12   * distribution rights 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  public class PropertyComparator implements Comparator<Object> {
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<Object>)property1).compareTo(
98                          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 }