1 /**
2 * This file Copyright (c) 2015-2018 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.resourceloader.Resource;
38 import info.magnolia.ui.api.availability.AvailabilityDefinition;
39 import info.magnolia.ui.api.availability.AvailabilityRuleDefinition;
40
41 import javax.inject.Inject;
42 import javax.jcr.Node;
43 import javax.jcr.RepositoryException;
44 import javax.jcr.version.VersionHistory;
45
46 import org.slf4j.Logger;
47 import org.slf4j.LoggerFactory;
48
49 /**
50 * This rule returns {@code true} if the item {@link Resource} has more than 1 version.
51 */
52 public class HasVersionsRule extends AbstractResourceAvailabilityRule {
53
54 private static final Logger log = LoggerFactory.getLogger(HasVersionsRule.class);
55
56 private final VersionManager versionManager;
57
58 @Inject
59 public HasVersionsRule(AvailabilityDefinition availabilityDefinition, AvailabilityRuleDefinition ruleDefinition, VersionManager versionManager) {
60 super(availabilityDefinition, ruleDefinition);
61 this.versionManager = versionManager;
62 }
63
64 @Override
65 protected boolean isAvailableFor(Resource resource) {
66 return getJcrNode(resource)
67 .map(this::hasVersion)
68 .orElse(false);
69 }
70
71 private boolean hasVersion(Node node) {
72 try {
73 VersionHistory versionHistory = versionManager.getVersionHistory(node);
74 if (versionHistory == null || versionHistory.getAllVersions() == null) {
75 log.debug("Node [{}] doesn't have versions.", node);
76 return false;
77 }
78 // We need at least one version (without root version - which will be included)
79 return versionHistory.getAllVersions().getSize() > 1;
80 } catch (RepositoryException e) {
81 log.debug("Could not version item [{}]", node, e);
82 return false;
83 }
84 }
85 }