TemplatesTreeContentProvider.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.slc.akb.ui.providers;
  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.apache.commons.logging.Log;
  26 import org.apache.commons.logging.LogFactory;
  27 import org.argeo.slc.akb.AkbException;
  28 import org.argeo.slc.akb.AkbTypes;
  29 import org.eclipse.jface.viewers.ITreeContentProvider;
  30 import org.eclipse.jface.viewers.Viewer;
  31
  32 /** Basic content provider for a tree of AKB environment templates */
  33 public class TemplatesTreeContentProvider implements ITreeContentProvider {
  34         private final static Log log = LogFactory
  35                         .getLog(TemplatesTreeContentProvider.class);
  36
  37         /**
  38          * @param parent
  39          *            Pass current user home as parameter
  40          *
  41          */
  42         public Object[] getElements(Object parent) {
  43                 if (parent instanceof Object[])
  44                         return (Object[]) parent;
  45                 else
  46                         return null;
  47         }
  48
  49         public Object getParent(Object child) {
  50                 try {
  51                         Node node = (Node) child;
  52
  53                         // Manual sanity check to avoid exception when tryin to refresh an
  54                         // element that displays a node which has been removed
  55                         try {
  56                                 String id = node.getIdentifier();
  57                                 node.getSession().getNodeByIdentifier(id);
  58                         } catch (Exception e) {
  59                                 log.warn("Trying to refresh an unexisting node");
  60                                 return null;
  61                         }
  62
  63                         if (node.getDepth() == 0)
  64                                 return null;
  65                         else
  66                                 return node.getParent();
  67
  68                 } catch (RepositoryException e) {
  69                         throw new AkbException("Error while getting parent node", e);
  70                 }
  71         }
  72
  73         public Object[] getChildren(Object parent) {
  74                 try {
  75                         NodeIterator ni = ((Node) parent).getNodes();
  76                         List<Node> nodes = new ArrayList<Node>();
  77
  78                         while (ni.hasNext()) {
  79                                 Node currNode = ni.nextNode();
  80                                 if (!currNode.isNodeType(AkbTypes.AKB_CONNECTOR_FOLDER))
  81                                         nodes.add(currNode);
  82                         }
  83
  84                         return nodes.toArray();
  85                 } catch (RepositoryException e) {
  86                         throw new AkbException("Error while getting children nodes", e);
  87                 }
  88         }
  89
  90         public boolean hasChildren(Object parent) {
  91                 try {
  92                         // refine this
  93                         return ((Node) parent).hasNodes();
  94                 } catch (RepositoryException e) {
  95                         throw new AkbException("Error while checking children nodes", e);
  96                 }
  97         }
  98
  99         public void dispose() {
 100                 // FIXME implement if needed
 101         }
 102
 103         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 104         }
 105 }