1 /**
2 * This file Copyright (c) 2019 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.ui.availability.rule;
35
36 import info.magnolia.jcr.util.NodeUtil;
37 import info.magnolia.ui.api.availability.AvailabilityDefinition;
38
39 import java.util.Collections;
40
41 import javax.jcr.Node;
42
43 import com.machinezoo.noexception.Exceptions;
44
45 /**
46 * Checks whether a JCR node has any children and returns true if there are any children.
47 *
48 */
49 public class JcrHasChildrenRule extends AbstractAvailabilityRule<Node, JcrHasChildrenRuleDefinition> {
50
51 private final NodeFilteringPredicate predicate = new NodeFilteringPredicate();
52
53 public JcrHasChildrenRule(AvailabilityDefinition availabilityDefinition, JcrHasChildrenRuleDefinition ruleDefinition) {
54 super(availabilityDefinition, ruleDefinition);
55 }
56
57 @Override
58 protected boolean isAvailableFor(Node item) {
59 return Exceptions.wrap().get(() -> {
60 predicate.setNodeTypes(getRuleDefinition().getNodeTypes().isEmpty() ? Collections.singletonList(item.getPrimaryNodeType().getName()) : getRuleDefinition().getNodeTypes());
61 return NodeUtil.getNodes(item, predicate).iterator().hasNext();
62 });
63 }
64
65 /**
66 * Predicate evaluating by node type.
67 */
68 static class NodeFilteringPredicate extends info.magnolia.jcr.predicate.NodeFilteringPredicate {
69 @Override
70 public boolean evaluateTyped(Node node) {
71 return !super.evaluateTyped(node);
72 }
73 }
74 }