org.argeo.eclipse.ui.workbench/src/org/argeo/eclipse/ui/workbench/commands/DeleteNodes.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.eclipse.ui.workbench.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.TreeParent;
  25 import org.argeo.eclipse.ui.dialogs.ErrorFeedback;
  26 import org.argeo.eclipse.ui.workbench.internal.jcr.model.SingleJcrNodeElem;
  27 import org.argeo.eclipse.ui.workbench.internal.jcr.model.WorkspaceElem;
  28 import org.argeo.eclipse.ui.workbench.jcr.JcrBrowserView;
  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.dialogs.MessageDialog;
  33 import org.eclipse.jface.viewers.ISelection;
  34 import org.eclipse.jface.viewers.IStructuredSelection;
  35 import org.eclipse.ui.handlers.HandlerUtil;
  36
  37 /**
  38  * Delete the selected nodes: both in the JCR repository and in the UI view.
  39  * Warning no check is done, except implementation dependent native checks,
  40  * handle with care.
  41  *
  42  * This handler is still 'hard linked' to a GenericJcrBrowser view to enable
  43  * correct tree refresh when a node is added. This must be corrected in future
  44  * versions.
  45  */
  46 public class DeleteNodes extends AbstractHandler {
  47         public Object execute(ExecutionEvent event) throws ExecutionException {
  48                 ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event)
  49                                 .getActivePage().getSelection();
  50                 if (selection == null || !(selection instanceof IStructuredSelection))
  51                         return null;
  52
  53                 JcrBrowserView view = (JcrBrowserView) HandlerUtil
  54                                 .getActiveWorkbenchWindow(event).getActivePage()
  55                                 .findView(HandlerUtil.getActivePartId(event));
  56
  57                 // confirmation
  58                 StringBuffer buf = new StringBuffer("");
  59                 Iterator<?> lst = ((IStructuredSelection) selection).iterator();
  60                 while (lst.hasNext()) {
  61                         SingleJcrNodeElem sjn = ((SingleJcrNodeElem) lst.next());
  62                         buf.append(sjn.getName()).append(' ');
  63                 }
  64                 Boolean ok = MessageDialog.openConfirm(
  65                                 HandlerUtil.getActiveShell(event), "Confirm deletion",
  66                                 "Do you want to delete " + buf + "?");
  67
  68                 // operation
  69                 if (ok) {
  70                         Iterator<?> it = ((IStructuredSelection) selection).iterator();
  71                         Object obj = null;
  72                         SingleJcrNodeElem ancestor = null;
  73                         WorkspaceElem rootAncestor = null;
  74                         try {
  75                                 while (it.hasNext()) {
  76                                         obj = it.next();
  77                                         if (obj instanceof SingleJcrNodeElem) {
  78                                                 // Cache objects
  79                                                 SingleJcrNodeElem sjn = (SingleJcrNodeElem) obj;
  80                                                 TreeParent tp = (TreeParent) sjn.getParent();
  81                                                 Node node = sjn.getNode();
  82
  83                                                 // Jcr Remove
  84                                                 node.remove();
  85                                                 node.getSession().save();
  86                                                 // UI remove
  87                                                 tp.removeChild(sjn);
  88
  89                                                 // Check if the parent is the root node
  90                                                 if (tp instanceof WorkspaceElem)
  91                                                         rootAncestor = (WorkspaceElem) tp;
  92                                                 else
  93                                                         ancestor = getOlder(ancestor, (SingleJcrNodeElem) tp);
  94                                         }
  95                                 }
  96                                 if (rootAncestor != null)
  97                                         view.nodeRemoved(rootAncestor);
  98                                 else if (ancestor != null)
  99                                         view.nodeRemoved(ancestor);
 100                         } catch (Exception e) {
 101                                 ErrorFeedback.show("Cannot delete selected node ", e);
 102                         }
 103                 }
 104                 return null;
 105         }
 106
 107         private SingleJcrNodeElem getOlder(SingleJcrNodeElem A, SingleJcrNodeElem B) {
 108                 try {
 109                         if (A == null)
 110                                 return B == null ? null : B;
 111                         // Todo enhanced this method
 112                         else
 113                                 return A.getNode().getDepth() <= B.getNode().getDepth() ? A : B;
 114                 } catch (RepositoryException re) {
 115                         throw new ArgeoException("Cannot find ancestor", re);
 116                 }
 117         }
 118 }