org.argeo.cms.ui.workbench/src/org/argeo/cms/ui/workbench/internal/jcr/JcrTreeContentProvider.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.workbench.internal.jcr;
  17
  18 import java.util.ArrayList;
  19 import java.util.Arrays;
  20 import java.util.List;
  21
  22 import javax.jcr.Node;
  23 import javax.jcr.NodeIterator;
  24 import javax.jcr.RepositoryException;
  25
  26 import org.argeo.eclipse.ui.EclipseUiException;
  27 import org.argeo.eclipse.ui.jcr.utils.JcrItemsComparator;
  28 import org.eclipse.jface.viewers.ITreeContentProvider;
  29 import org.eclipse.jface.viewers.Viewer;
  30
  31 /**
  32  * Implementation of the {@code ITreeContentProvider} in order to display a
  33  * single JCR node and its children in a tree like structure
  34  */
  35 public class JcrTreeContentProvider implements ITreeContentProvider {
  36         private static final long serialVersionUID = -2128326504754297297L;
  37         // private Node rootNode;
  38         private JcrItemsComparator itemComparator = new JcrItemsComparator();
  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                         List<Node> result = new ArrayList<Node>();
  48                         NodeIterator ni = rootNode.getNodes();
  49                         while (ni.hasNext())
  50                                 result.add(ni.nextNode());
  51                         return result.toArray();
  52                 } catch (RepositoryException re) {
  53                         throw new EclipseUiException("Unable to retrieve elements for " + inputElement, re);
  54                 }
  55         }
  56
  57         public Object[] getChildren(Object parentElement) {
  58                 return childrenNodes((Node) parentElement);
  59         }
  60
  61         public Object getParent(Object element) {
  62                 try {
  63                         Node node = (Node) element;
  64                         if (!node.getPath().equals("/"))
  65                                 return node.getParent();
  66                         else
  67                                 return null;
  68                 } catch (RepositoryException e) {
  69                         return null;
  70                 }
  71         }
  72
  73         public boolean hasChildren(Object element) {
  74                 try {
  75                         return ((Node) element).hasNodes();
  76                 } catch (RepositoryException e) {
  77                         throw new EclipseUiException("Cannot check children existence on " + element, e);
  78                 }
  79         }
  80
  81         protected Object[] childrenNodes(Node parentNode) {
  82                 try {
  83                         List<Node> children = new ArrayList<Node>();
  84                         NodeIterator nit = parentNode.getNodes();
  85                         while (nit.hasNext())
  86                                 children.add(nit.nextNode());
  87                         Node[] arr = children.toArray(new Node[0]);
  88                         Arrays.sort(arr, itemComparator);
  89                         return arr;
  90                 } catch (RepositoryException e) {
  91                         throw new EclipseUiException("Cannot list children of " + parentNode, e);
  92                 }
  93         }
  94
  95         public void dispose() {
  96         }
  97
  98         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  99         }
 100 }