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1   /**
2    * This file Copyright (c) 2013-2014 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.pages.app.availability;
35  
36  import info.magnolia.jcr.util.NodeTypes;
37  import info.magnolia.jcr.util.NodeUtil;
38  import info.magnolia.ui.api.availability.AbstractAvailabilityRule;
39  import javax.jcr.Item;
40  import javax.jcr.Node;
41  import javax.jcr.RepositoryException;
42  
43  import org.slf4j.Logger;
44  import org.slf4j.LoggerFactory;
45  
46  /**
47   * This rule returns true, if the item is node of the mgnl:page type and has a subnode of the same type.
48   */
49  public class PageHasSubpagesRule extends AbstractAvailabilityRule {
50  
51      private static final Logger log = LoggerFactory.getLogger(PageHasSubpagesRule.class);
52  
53      @Override
54      public boolean isAvailableForItem(Item item) {
55          // item must be a Node
56          if (item != null && item.isNode()) {
57              Node node = (Node) item;
58              try {
59                  // node must be of the Page type
60                  if (NodeUtil.isNodeType(node, NodeTypes.Page.NAME)) {
61                      // has sub-pages?
62                      return NodeUtil.getNodes(node, NodeTypes.Page.NAME).iterator().hasNext();
63                  }
64              } catch (RepositoryException e) {
65                  String path = "unknown";
66                  try {
67                      path = node.getPath();
68                  } catch (RepositoryException e1) {
69                      // nothing to do
70                  }
71                  log.warn("Error evaluating availability for node [{}], returning false: {}", path, e.getMessage());
72              }
73          }
74          return false;
75      }
76  }