plugins/org.argeo.slc.akb.ui/src/main/java/org/argeo/slc/akb/ui/providers/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 active AKB environments */
  33 public class TemplatesTreeContentProvider implements ITreeContentProvider {
  34         private final static Log log = LogFactory
  35                         .getLog(TemplatesTreeContentProvider.class);
  36
  37         /**
  38          * @param parent
  39          */
  40         public Object[] getElements(Object parent) {
  41                 if (parent instanceof Object[])
  42                         return (Object[]) parent;
  43                 else
  44                         return null;
  45         }
  46
  47         public Object getParent(Object child) {
  48                 try {
  49                         Node node = (Node) child;
  50
  51                         // Manual sanity check to avoid exception when trying to refresh an
  52                         // element that displays a node which has been removed
  53                         try {
  54                                 String id = node.getIdentifier();
  55                                 node.getSession().getNodeByIdentifier(id);
  56                         } catch (Exception e) {
  57                                 log.warn("Trying to refresh an unexisting node");
  58                                 return null;
  59                         }
  60
  61                         if (node.getDepth() == 0)
  62                                 return null;
  63                         else
  64                                 return node.getParent();
  65
  66                 } catch (RepositoryException e) {
  67                         throw new AkbException("Error while getting parent node", e);
  68                 }
  69         }
  70
  71         public Object[] getChildren(Object parent) {
  72                 try {
  73                         NodeIterator ni = ((Node) parent).getNodes();
  74                         List<Node> nodes = new ArrayList<Node>();
  75
  76                         while (ni.hasNext()) {
  77                                 Node currNode = ni.nextNode();
  78                                 if (!currNode.isNodeType(AkbTypes.AKB_CONNECTOR_FOLDER))
  79                                         nodes.add(currNode);
  80                         }
  81
  82                         return nodes.toArray();
  83                 } catch (RepositoryException e) {
  84                         throw new AkbException("Error while getting children nodes", e);
  85                 }
  86         }
  87
  88         public boolean hasChildren(Object parent) {
  89                 try {
  90                         // refine this
  91                         return ((Node) parent).hasNodes();
  92                 } catch (RepositoryException e) {
  93                         throw new AkbException("Error while checking children nodes", e);
  94                 }
  95         }
  96
  97         public void dispose() {
  98                 // FIXME implement if needed
  99         }
 100
 101         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 102         }
 103
 104
 105
 106 }