| PropertyComparator.java |
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 }