1 /**
2 * This file Copyright (c) 2003-2012 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.module.forum;
35
36 import info.magnolia.cms.core.HierarchyManager;
37
38 import java.util.ArrayList;
39 import java.util.List;
40
41 import javax.jcr.Node;
42 import javax.jcr.NodeIterator;
43 import javax.jcr.RepositoryException;
44 import javax.jcr.query.QueryResult;
45
46 /**
47 * Pages a {@link javax.jcr.query.QueryResult} while checking for permissions using a given {@link info.magnolia.cms.security.AccessManager}.
48 *
49 * @author gjoseph
50 * @version $Revision: $ ($Author: $)
51 */
52 public class Pager {
53 private final HierarchyManager hierarchyManager;
54 private final QueryResult queryResult;
55
56 public Pager(final HierarchyManager hierarchyManager, final QueryResult jcrResult) {
57 this.hierarchyManager = hierarchyManager;
58 queryResult = jcrResult;
59 }
60
61 public PagedResult page(long skip, long maxResult) throws RepositoryException {
62 long endPosition = skip + maxResult;
63 final List<Node> res = new ArrayList<Node>();
64 final NodeIterator nodeIterator = queryResult.getNodes();
65
66 final long total = nodeIterator.getSize();
67 nodeIterator.skip(skip);
68
69 while (nodeIterator.hasNext()) {
70 final Node node = nodeIterator.nextNode();
71 res.add(node);
72
73 if (nodeIterator.getPosition() >= endPosition) {
74 break;
75 }
76 }
77
78 return new PagedResult(res, total);
79 }
80 }