org.argeo.cms.ui/src/org/argeo/cms/ui/jcr/FullVersioningTreeContentProvider.java

   1 /*
   2  * Copyright (C) 2007-2012 Argeo GmbH
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *         http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package org.argeo.cms.ui.jcr;
  17
  18 import java.util.ArrayList;
  19 import java.util.List;
  20
  21 import javax.jcr.Node;
  22 import javax.jcr.RepositoryException;
  23 import javax.jcr.nodetype.NodeType;
  24 import javax.jcr.version.Version;
  25 import javax.jcr.version.VersionHistory;
  26 import javax.jcr.version.VersionIterator;
  27 import javax.jcr.version.VersionManager;
  28
  29 import org.argeo.eclipse.ui.EclipseUiException;
  30 import org.eclipse.jface.viewers.ITreeContentProvider;
  31 import org.eclipse.jface.viewers.Viewer;
  32
  33 /**
  34  * Display some version information of a JCR full versionable node in a tree
  35  * like structure
  36  */
  37 public class FullVersioningTreeContentProvider implements ITreeContentProvider {
  38         private static final long serialVersionUID = 8691772509491211112L;
  39
  40         /**
  41          * Sends back the first level of the Tree. input element must be a single
  42          * node object
  43          */
  44         public Object[] getElements(Object inputElement) {
  45                 try {
  46                         Node rootNode = (Node) inputElement;
  47                         String curPath = rootNode.getPath();
  48                         VersionManager vm = rootNode.getSession().getWorkspace()
  49                                         .getVersionManager();
  50
  51                         VersionHistory vh = vm.getVersionHistory(curPath);
  52                         List<Version> result = new ArrayList<Version>();
  53                         VersionIterator vi = vh.getAllLinearVersions();
  54
  55                         while (vi.hasNext()) {
  56                                 result.add(vi.nextVersion());
  57                         }
  58                         return result.toArray();
  59                 } catch (RepositoryException re) {
  60                         throw new EclipseUiException(
  61                                         "Unexpected error while getting version elements", re);
  62                 }
  63         }
  64
  65         public Object[] getChildren(Object parentElement) {
  66                 try {
  67                         if (parentElement instanceof Version) {
  68                                 List<Node> tmp = new ArrayList<Node>();
  69                                 tmp.add(((Version) parentElement).getFrozenNode());
  70                                 return tmp.toArray();
  71                         }
  72                 } catch (RepositoryException re) {
  73                         throw new EclipseUiException("Unexpected error while getting child "
  74                                         + "node for version element", re);
  75                 }
  76                 return null;
  77         }
  78
  79         public Object getParent(Object element) {
  80                 try {
  81                         // this will not work in a simpleVersionning environment, parent is
  82                         // not a node.
  83                         if (element instanceof Node
  84                                         && ((Node) element).isNodeType(NodeType.NT_FROZEN_NODE)) {
  85                                 Node node = (Node) element;
  86                                 return node.getParent();
  87                         } else
  88                                 return null;
  89                 } catch (RepositoryException e) {
  90                         return null;
  91                 }
  92         }
  93
  94         public boolean hasChildren(Object element) {
  95                 try {
  96                         if (element instanceof Version)
  97                                 return true;
  98                         else if (element instanceof Node)
  99                                 return ((Node) element).hasNodes();
 100                         else
 101                                 return false;
 102                 } catch (RepositoryException e) {
 103                         throw new EclipseUiException("Cannot check children of " + element, e);
 104                 }
 105         }
 106
 107         public void dispose() {
 108         }
 109
 110         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 111         }
 112
 113 }