server/plugins/org.argeo.jcr.ui.explorer/src/main/java/org/argeo/jcr/ui/explorer/commands/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.jcr.ui.explorer.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.TreeParent;
  26 import org.argeo.jcr.ui.explorer.model.SingleJcrNode;
  27 import org.argeo.jcr.ui.explorer.model.WorkspaceNode;
  28 import org.argeo.jcr.ui.explorer.views.GenericJcrBrowser;
  29 import org.eclipse.core.commands.AbstractHandler;
  30 import org.eclipse.core.commands.ExecutionEvent;
  31 import org.eclipse.core.commands.ExecutionException;
  32 import org.eclipse.jface.viewers.ISelection;
  33 import org.eclipse.jface.viewers.IStructuredSelection;
  34 import org.eclipse.ui.handlers.HandlerUtil;
  35
  36 /**
  37  * Deletes the selected nodes: both in the JCR repository and in the UI view.
  38  * Warning no check is done, except implementation dependent native checks,
  39  * handle with care.
  40  *
  41  * This handler is still 'hard linked' to a GenericJcrBrowser view to enable
  42  * correct tree refresh when a node is added. This must be corrected in future
  43  * versions.
  44  */
  45 public class DeleteNodes extends AbstractHandler {
  46         public Object execute(ExecutionEvent event) throws ExecutionException {
  47                 ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event)
  48                                 .getActivePage().getSelection();
  49                 GenericJcrBrowser view = (GenericJcrBrowser) HandlerUtil
  50                                 .getActiveWorkbenchWindow(event).getActivePage()
  51                                 .findView(HandlerUtil.getActivePartId(event));
  52
  53                 if (selection != null && selection instanceof IStructuredSelection) {
  54                         Iterator<?> it = ((IStructuredSelection) selection).iterator();
  55                         Object obj = null;
  56                         SingleJcrNode ancestor = null;
  57                         WorkspaceNode rootAncestor = null;
  58                         try {
  59                                 while (it.hasNext()) {
  60                                         obj = it.next();
  61                                         if (obj instanceof SingleJcrNode) {
  62                                                 // Cache objects
  63                                                 SingleJcrNode sjn = (SingleJcrNode) obj;
  64                                                 TreeParent tp = (TreeParent) sjn.getParent();
  65                                                 Node node = sjn.getNode();
  66
  67                                                 // Jcr Remove
  68                                                 node.remove();
  69                                                 node.getSession().save();
  70                                                 // UI remove
  71                                                 tp.removeChild(sjn);
  72
  73                                                 // Check if the parent is the root node
  74                                                 if (tp instanceof WorkspaceNode)
  75                                                         rootAncestor = (WorkspaceNode) tp;
  76                                                 else
  77                                                         ancestor = getOlder(ancestor, (SingleJcrNode) tp);
  78                                         }
  79                                 }
  80                                 if (rootAncestor != null)
  81                                         view.nodeRemoved(rootAncestor);
  82                                 else if (ancestor != null)
  83                                         view.nodeRemoved(ancestor);
  84                         } catch (Exception e) {
  85                                 ErrorFeedback.show("Cannot delete selected node ", e);
  86                         }
  87                 }
  88                 return null;
  89         }
  90
  91         private SingleJcrNode getOlder(SingleJcrNode A, SingleJcrNode B) {
  92                 try {
  93                         if (A == null)
  94                                 return B == null ? null : B;
  95                         // Todo enhanced this method
  96                         else
  97                                 return A.getNode().getDepth() <= B.getNode().getDepth() ? A : B;
  98                 } catch (RepositoryException re) {
  99                         throw new ArgeoException("Cannot find ancestor", re);
 100                 }
 101         }
 102 }