1 /**
2 * This file Copyright (c) 2015 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.jcr.comparator;
35
36 import info.magnolia.jcr.util.NodeTypes;
37
38 import java.util.Calendar;
39 import java.util.Comparator;
40
41 import javax.jcr.Node;
42 import javax.jcr.RepositoryException;
43
44 /**
45 * Compares the creation date of two nodes.
46 *
47 * <p>Not having the created property ({@link NodeTypes.Created#getCreated(Node)} will return <code>null</code>) will be
48 * considered as a lesser value. When both nodes do not have the created property they will be considered equal.</p>
49 *
50 * @see info.magnolia.jcr.util.NodeTypes.Created
51 */
52 public class CreationDateComparator implements Comparator<Node> {
53
54 @Override
55 public int compare(Node node1, Node node2) {
56 try {
57 final Calendar date1 = NodeTypes.Created.getCreated(node1);
58 final Calendar date2 = NodeTypes.Created.getCreated(node2);
59
60 if (date1 == date2) {
61 return 0;
62 }
63 if (date1 == null) {
64 return -1;
65 }
66 if (date2 == null) {
67 return 1;
68 }
69 return date1.compareTo(date2);
70 } catch (RepositoryException e) {
71 throw new RuntimeException("Error retrieving creation date from jcr node.", e);
72 }
73 }
74
75 }