DeleteNodes.java

   1 /*
   2  * Copyright (C) 2007-2012 Mathieu Baudier
   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.commands;
  17
  18 import java.util.Iterator;
  19
  20 import javax.jcr.Node;
  21 import javax.jcr.RepositoryException;
  22
  23 import org.argeo.ArgeoException;
  24 import org.argeo.eclipse.ui.ErrorFeedback;
  25 import org.argeo.eclipse.ui.jcr.views.AbstractJcrBrowser;
  26 import org.eclipse.core.commands.AbstractHandler;
  27 import org.eclipse.core.commands.ExecutionEvent;
  28 import org.eclipse.core.commands.ExecutionException;
  29 import org.eclipse.jface.viewers.ISelection;
  30 import org.eclipse.jface.viewers.IStructuredSelection;
  31 import org.eclipse.ui.handlers.HandlerUtil;
  32
  33 /**
  34  * Deletes the selected nodes and refresh the corresponding AbstractJcrView.
  35  * Note that no model specific check is done to see if the node can be removed
  36  * or not. Extend or override to implement specific behaviour.
  37  */
  38 public class DeleteNodes extends AbstractHandler {
  39         public final static String ID = "org.argeo.eclipse.ui.jcr.deleteNodes";
  40         public final static String DEFAULT_LABEL = "Delete selected nodes";
  41
  42         public Object execute(ExecutionEvent event) throws ExecutionException {
  43                 ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event)
  44                                 .getActivePage().getSelection();
  45                 AbstractJcrBrowser view = (AbstractJcrBrowser) HandlerUtil
  46                                 .getActiveWorkbenchWindow(event).getActivePage()
  47                                 .findView(HandlerUtil.getActivePartId(event));
  48
  49                 if (selection != null && selection instanceof IStructuredSelection) {
  50                         Iterator<?> it = ((IStructuredSelection) selection).iterator();
  51                         Object obj = null;
  52                         Node ancestor = null;
  53                         try {
  54                                 while (it.hasNext()) {
  55                                         obj = it.next();
  56                                         if (obj instanceof Node) {
  57                                                 Node node = (Node) obj;
  58                                                 Node parentNode = node.getParent();
  59                                                 node.remove();
  60                                                 node.getSession().save();
  61                                                 ancestor = getOlder(ancestor, parentNode);
  62                                         }
  63                                 }
  64                                 if (ancestor != null)
  65                                         view.nodeRemoved(ancestor);
  66                         } catch (Exception e) {
  67                                 ErrorFeedback.show("Cannot delete node " + obj, e);
  68                         }
  69                 }
  70                 return null;
  71         }
  72
  73         protected Node getOlder(Node A, Node B) {
  74                 try {
  75
  76                         if (A == null)
  77                                 return B == null ? null : B;
  78                         // Todo enhanced this method
  79                         else
  80                                 return A.getDepth() <= B.getDepth() ? A : B;
  81                 } catch (RepositoryException re) {
  82                         throw new ArgeoException("Cannot find ancestor", re);
  83                 }
  84         }
  85 }