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.resources.app.availability;
35
36 import info.magnolia.cms.core.version.VersionManager;
37 import info.magnolia.jcr.util.SessionUtil;
38 import info.magnolia.resourceloader.Resource;
39 import info.magnolia.resourceloader.ResourceOrigin;
40 import info.magnolia.resourceloader.jcr.JcrResourceOrigin;
41 import info.magnolia.resourceloader.layered.LayeredResource;
42
43 import javax.inject.Inject;
44 import javax.jcr.Node;
45 import javax.jcr.RepositoryException;
46 import javax.jcr.version.VersionHistory;
47
48 import org.slf4j.Logger;
49 import org.slf4j.LoggerFactory;
50
51 /**
52 * This rule returns {@code true} if the item {@link Resource} has more than 1 version.
53 */
54 public class HasVersionsRule extends AbstractResourceAvailabilityRule {
55
56 private static final Logger log = LoggerFactory.getLogger(HasVersionsRule.class);
57
58 private final VersionManager versionManager;
59
60 @Inject
61 public HasVersionsRule(ResourceOrigin origin, VersionManager versionManager) {
62 super(origin);
63 this.versionManager = versionManager;
64 }
65
66 @Override
67 protected boolean isAvailableFor(Resource itemId) {
68 LayeredResource layeredResource = (LayeredResource) itemId;
69 if (layeredResource.getFirst().getOrigin() instanceof JcrResourceOrigin) {
70 String resourcePath = layeredResource.getFirst().getPath();
71 Node node = SessionUtil.getNode(JcrResourceOrigin.RESOURCES_WORKSPACE, resourcePath);
72
73 if (node != null) {
74 try {
75 VersionHistory versionHistory = versionManager.getVersionHistory(node);
76 if (versionHistory == null || versionHistory.getAllVersions() == null) {
77 log.debug("Node [{}] doesn't have versions.", node);
78 return false;
79 }
80 // We need at least one version (without root version - which will be included)
81 return versionHistory.getAllVersions().getSize() > 1;
82 } catch (RepositoryException e) {
83 log.debug("Could not version item [{}]", node, e);
84 return false;
85 }
86 }
87 }
88 return false;
89 }
90 }