org.argeo.cms.e4/src/org/argeo/cms/e4/jcr/handlers/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.cms.e4.jcr.handlers;
  17
  18 import java.util.List;
  19
  20 import javax.inject.Named;
  21 import javax.jcr.Node;
  22 import javax.jcr.RepositoryException;
  23
  24 import org.argeo.cms.e4.jcr.JcrBrowserView;
  25 import org.argeo.cms.ui.jcr.model.SingleJcrNodeElem;
  26 import org.argeo.cms.ui.jcr.model.WorkspaceElem;
  27 import org.argeo.eclipse.ui.EclipseUiException;
  28 import org.argeo.eclipse.ui.TreeParent;
  29 import org.argeo.eclipse.ui.dialogs.ErrorFeedback;
  30 import org.eclipse.e4.core.di.annotations.Execute;
  31 import org.eclipse.e4.ui.model.application.ui.basic.MPart;
  32 import org.eclipse.e4.ui.services.IServiceConstants;
  33 import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
  34 import org.eclipse.jface.dialogs.MessageDialog;
  35 import org.eclipse.swt.widgets.Display;
  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 {
  47         @Execute
  48         public void execute(@Named(IServiceConstants.ACTIVE_PART) MPart part, ESelectionService selectionService) {
  49                 List<?> selection = (List<?>) selectionService.getSelection();
  50                 if (selection == null)
  51                         return;
  52
  53                 JcrBrowserView view = (JcrBrowserView) part.getObject();
  54
  55                 // confirmation
  56                 StringBuffer buf = new StringBuffer("");
  57                 for (Object o : selection) {
  58                         SingleJcrNodeElem sjn = (SingleJcrNodeElem) o;
  59                         buf.append(sjn.getName()).append(' ');
  60                 }
  61                 Boolean doRemove = MessageDialog.openConfirm(Display.getCurrent().getActiveShell(), "Confirm deletion",
  62                                 "Do you want to delete " + buf + "?");
  63
  64                 // operation
  65                 if (doRemove) {
  66                         SingleJcrNodeElem ancestor = null;
  67                         WorkspaceElem rootAncestor = null;
  68                         try {
  69                                 for (Object obj : selection) {
  70                                         if (obj instanceof SingleJcrNodeElem) {
  71                                                 // Cache objects
  72                                                 SingleJcrNodeElem sjn = (SingleJcrNodeElem) obj;
  73                                                 TreeParent tp = (TreeParent) sjn.getParent();
  74                                                 Node node = sjn.getNode();
  75
  76                                                 // Jcr Remove
  77                                                 node.remove();
  78                                                 node.getSession().save();
  79                                                 // UI remove
  80                                                 tp.removeChild(sjn);
  81
  82                                                 // Check if the parent is the root node
  83                                                 if (tp instanceof WorkspaceElem)
  84                                                         rootAncestor = (WorkspaceElem) tp;
  85                                                 else
  86                                                         ancestor = getOlder(ancestor, (SingleJcrNodeElem) tp);
  87                                         }
  88                                 }
  89                                 if (rootAncestor != null)
  90                                         view.nodeRemoved(rootAncestor);
  91                                 else if (ancestor != null)
  92                                         view.nodeRemoved(ancestor);
  93                         } catch (Exception e) {
  94                                 ErrorFeedback.show("Cannot delete selected node ", e);
  95                         }
  96                 }
  97         }
  98
  99         private SingleJcrNodeElem getOlder(SingleJcrNodeElem A, SingleJcrNodeElem B) {
 100                 try {
 101                         if (A == null)
 102                                 return B == null ? null : B;
 103                         // Todo enhanced this method
 104                         else
 105                                 return A.getNode().getDepth() <= B.getNode().getDepth() ? A : B;
 106                 } catch (RepositoryException re) {
 107                         throw new EclipseUiException("Cannot find ancestor", re);
 108                 }
 109         }
 110 }