org.argeo.eclipse.ui/src/org/argeo/eclipse/ui/jcr/NodesWrapper.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.eclipse.ui.jcr;
  17
  18 import java.util.ArrayList;
  19 import java.util.List;
  20
  21 import javax.jcr.Node;
  22 import javax.jcr.NodeIterator;
  23 import javax.jcr.RepositoryException;
  24
  25 import org.argeo.eclipse.ui.EclipseUiException;
  26
  27 /**
  28  * Element of tree which is based on a node, but whose children are not
  29  * necessarily this node children.
  30  */
  31 public class NodesWrapper {
  32         private final Node node;
  33
  34         public NodesWrapper(Node node) {
  35                 super();
  36                 this.node = node;
  37         }
  38
  39         protected NodeIterator getNodeIterator() throws RepositoryException {
  40                 return node.getNodes();
  41         }
  42
  43         protected List<WrappedNode> getWrappedNodes() throws RepositoryException {
  44                 List<WrappedNode> nodes = new ArrayList<WrappedNode>();
  45                 for (NodeIterator nit = getNodeIterator(); nit.hasNext();)
  46                         nodes.add(new WrappedNode(this, nit.nextNode()));
  47                 return nodes;
  48         }
  49
  50         public Object[] getChildren() {
  51                 try {
  52                         return getWrappedNodes().toArray();
  53                 } catch (RepositoryException e) {
  54                         throw new EclipseUiException("Cannot get wrapped children", e);
  55                 }
  56         }
  57
  58         /**
  59          * @return true by default because we don't want to compute the wrapped
  60          *         nodes twice
  61          */
  62         public Boolean hasChildren() {
  63                 return true;
  64         }
  65
  66         public Node getNode() {
  67                 return node;
  68         }
  69
  70         @Override
  71         public int hashCode() {
  72                 return node.hashCode();
  73         }
  74
  75         @Override
  76         public boolean equals(Object obj) {
  77                 if (obj instanceof NodesWrapper)
  78                         return node.equals(((NodesWrapper) obj).getNode());
  79                 else
  80                         return false;
  81         }
  82
  83         public String toString() {
  84                 return "nodes wrapper based on " + node;
  85         }
  86 }