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Java > Open Source Codes > org > opencms > workplace > list > CmsListItemNumericalComparator


1 /*
2  * File : $Source: /usr/local/cvs/opencms/src/org/opencms/workplace/list/CmsListItemNumericalComparator.java,v $
3  * Date : $Date: 2006/03/27 14:52:28 $
4  * Version: $Revision: 1.2 $
5  *
6  * This library is part of OpenCms -
7  * the Open Source Content Mananagement System
8  *
9  * Copyright (c) 2005 Alkacon Software GmbH (http://www.alkacon.com)
10  *
11  * This library is free software; you can redistribute it and/or
12  * modify it under the terms of the GNU Lesser General Public
13  * License as published by the Free Software Foundation; either
14  * version 2.1 of the License, or (at your option) any later version.
15  *
16  * This library is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19  * Lesser General Public License for more details.
20  *
21  * For further information about Alkacon Software GmbH, please see the
22  * company website: http://www.alkacon.com
23  *
24  * For further information about OpenCms, please see the
25  * project website: http://www.opencms.org
26  *
27  * You should have received a copy of the GNU Lesser General Public
28  * License along with this library; if not, write to the Free Software
29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30  */
31
32 package org.opencms.workplace.list;
33
34 import java.text.Collator JavaDoc;
35 import java.util.Comparator JavaDoc;
36 import java.util.Locale JavaDoc;
37
38 /**
39  * Default comparator for case sensitive column sorting with string localization.<p>
40  *
41  * If both list items column values are Strings then a localized collector is used for sorting;
42  * if not, the <code>{@link Comparable}</code> interface is used.<p>
43  *
44  * @author Jan Baudisch
45  *
46  * @version $Revision: 1.2 $
47  *
48  * @since 6.0.0
49  *
50  * @see org.opencms.workplace.list.CmsListColumnDefinition
51  */
52 public class CmsListItemNumericalComparator implements I_CmsListItemComparator {
53
54     /**
55      * Default Constructor.<p>
56      */
57     public CmsListItemNumericalComparator() {
58
59         // no-op
60 }
61
62     /**
63      * @see org.opencms.workplace.list.I_CmsListItemComparator#getComparator(java.lang.String, java.util.Locale)
64      */
65     public Comparator JavaDoc getComparator(final String JavaDoc columnId, final Locale JavaDoc locale) {
66
67         final Collator JavaDoc collator = Collator.getInstance(locale);
68         return new Comparator JavaDoc() {
69
70             /**
71              * @see java.util.Comparator#compare(java.lang.Object, java.lang.Object)
72              */
73             public int compare(Object JavaDoc o1, Object JavaDoc o2) {
74
75                 Comparable JavaDoc c1 = (Comparable JavaDoc)((CmsListItem)o1).get(columnId);
76                 Comparable JavaDoc c2 = (Comparable JavaDoc)((CmsListItem)o2).get(columnId);
77                 if (c1 instanceof String JavaDoc && c2 instanceof String JavaDoc) {
78                     return collator.compare(c1, c2);
79                 } else if (c1 != null) {
80                     if (c2 == null) {
81                         return 1;
82                     }
83                     return c1.compareTo(c2);
84                 } else if (c2 != null) {
85                     return -1;
86                 }
87                 return 0;
88             }
89         };
90     }
91 }
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