org.argeo.cms.ui.workbench/src/org/argeo/cms/ui/workbench/internal/jcr/model/SingleJcrNodeElem.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.model;
  17
  18 import javax.jcr.Node;
  19 import javax.jcr.NodeIterator;
  20 import javax.jcr.RepositoryException;
  21 import javax.jcr.Workspace;
  22
  23 import org.argeo.eclipse.ui.EclipseUiException;
  24 import org.argeo.eclipse.ui.TreeParent;
  25
  26 /**
  27  * UI Tree component. Wraps a node of a JCR {@link Workspace}. It also keeps a
  28  * reference to its parent node that can either be a {@link WorkspaceElem}, a
  29  * {@link SingleJcrNodeElem} or null if the node is "mounted" as the root of the UI
  30  * tree.
  31  */
  32
  33 public class SingleJcrNodeElem extends TreeParent {
  34
  35         private final Node node;
  36         private String alias = null;
  37
  38         // keeps a local reference to the node's name to avoid exception when the
  39         // session is lost
  40         // private final String name;
  41
  42         /** Creates a new UiNode in the UI Tree */
  43         public SingleJcrNodeElem(TreeParent parent, Node node, String name) {
  44                 super(name);
  45                 setParent(parent);
  46                 this.node = node;
  47         }
  48
  49         /**
  50          * Creates a new UiNode in the UI Tree, keeping a reference to the alias of
  51          * the corresponding repository in the current UI environment. It is useful
  52          * to be able to mount nodes as roots of the UI tree.
  53          */
  54         public SingleJcrNodeElem(TreeParent parent, Node node, String name, String alias) {
  55                 super(name);
  56                 setParent(parent);
  57                 this.node = node;
  58                 this.alias = alias;
  59         }
  60
  61         /** returns the node wrapped by the current Ui object */
  62         public Node getNode() {
  63                 return node;
  64         }
  65
  66         protected String getRepositoryAlias() {
  67                 return alias;
  68         }
  69
  70         /**
  71          * Override normal behavior to initialize children only when first requested
  72          */
  73         @Override
  74         public synchronized Object[] getChildren() {
  75                 if (isLoaded()) {
  76                         return super.getChildren();
  77                 } else {
  78                         // initialize current object
  79                         try {
  80                                 NodeIterator ni = node.getNodes();
  81                                 while (ni.hasNext()) {
  82                                         Node curNode = ni.nextNode();
  83                                         addChild(new SingleJcrNodeElem(this, curNode, curNode.getName()));
  84                                 }
  85                                 return super.getChildren();
  86                         } catch (RepositoryException re) {
  87                                 throw new EclipseUiException(
  88                                                 "Unexcpected error while initializing children SingleJcrNode",
  89                                                 re);
  90                         }
  91                 }
  92         }
  93
  94         @Override
  95         public boolean hasChildren() {
  96                 try {
  97                         if (node.getSession().isLive())
  98                                 return node.hasNodes();
  99                         else
 100                                 return false;
 101                 } catch (RepositoryException re) {
 102                         throw new EclipseUiException(
 103                                         "Unexpected error while checking children node existence",
 104                                         re);
 105                 }
 106         }
 107
 108 }