View Javadoc

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.action;
35  
36  import info.magnolia.cms.core.version.VersionManager;
37  import info.magnolia.ui.api.action.AbstractAction;
38  import info.magnolia.ui.api.action.ActionExecutionException;
39  import info.magnolia.ui.api.location.LocationController;
40  import info.magnolia.ui.contentapp.detail.DetailLocation;
41  import info.magnolia.ui.contentapp.detail.DetailView;
42  import info.magnolia.ui.vaadin.integration.jcr.AbstractJcrNodeAdapter;
43  
44  import javax.inject.Inject;
45  import javax.jcr.RepositoryException;
46  import javax.jcr.version.Version;
47  import javax.jcr.version.VersionIterator;
48  
49  import org.apache.commons.lang3.StringUtils;
50  import org.slf4j.Logger;
51  import org.slf4j.LoggerFactory;
52  
53  /**
54   * Opens a preview of the previous version of the selected page.
55   */
56  public class PreviewPreviousVersionAction extends AbstractAction<PreviewPreviousVersionActionDefinition> {
57      private final Logger log = LoggerFactory.getLogger(getClass());
58      private final AbstractJcrNodeAdapter nodeItemToEdit;
59      private final LocationController locationController;
60      private final VersionManager versionManager;
61  
62      @Inject
63      public PreviewPreviousVersionAction(PreviewPreviousVersionActionDefinition definition, AbstractJcrNodeAdapter nodeItemToEdit, LocationController locationController, VersionManager versionManager) {
64          super(definition);
65          this.nodeItemToEdit = nodeItemToEdit;
66          this.locationController = locationController;
67          this.versionManager = versionManager;
68      }
69  
70      @Override
71      public void execute() throws ActionExecutionException {
72          try {
73              final String path = nodeItemToEdit.getJcrItem().getPath();
74              final String previousVersion = getPreviousVersion();
75              DetailLocation location = new DetailLocation("pages", "detail", DetailView.ViewType.VIEW, path, previousVersion);
76              locationController.goTo(location);
77  
78          } catch (RepositoryException e) {
79              throw new ActionExecutionException("Could not execute PreviewPreviousVersionAction: ", e);
80          }
81      }
82  
83      /**
84       * @return Last version if present or an empty string if no version are available.
85       */
86      private String getPreviousVersion() throws RepositoryException {
87          String previousVersion = StringUtils.EMPTY;
88          VersionIterator versionIterator = versionManager.getAllVersions(nodeItemToEdit.getJcrItem());
89          // Check.
90          if (versionIterator == null) {
91              return previousVersion;
92          }
93          // Get last Version.
94          while (versionIterator.hasNext()) {
95              Version version = versionIterator.nextVersion();
96              previousVersion = version.getName();
97          }
98  
99          return previousVersion;
100     }
101 
102 }