taxeditor-navigation/src/main/java/eu/etaxonomy/taxeditor/navigation/navigator/TaxonDropAdapterAssistant.java

   1 // $Id$
   2 /**
   3 * Copyright (C) 2007 EDIT
   4 * European Distributed Institute of Taxonomy
   5 * http://www.e-taxonomy.eu
   6 *
   7 * The contents of this file are subject to the Mozilla Public License Version 1.1
   8 * See LICENSE.TXT at the top of this package for the full license terms.
   9 */
  10
  11 package eu.etaxonomy.taxeditor.navigation.navigator;
  12
  13 import org.apache.log4j.Logger;
  14 import org.eclipse.core.commands.operations.IUndoContext;
  15 import org.eclipse.core.commands.operations.IUndoableOperation;
  16 import org.eclipse.core.runtime.IStatus;
  17 import org.eclipse.core.runtime.Status;
  18 import org.eclipse.jface.dialogs.MessageDialog;
  19 import org.eclipse.jface.util.LocalSelectionTransfer;
  20 import org.eclipse.jface.viewers.ISelection;
  21 import org.eclipse.jface.viewers.TreeSelection;
  22 import org.eclipse.swt.dnd.DropTargetEvent;
  23 import org.eclipse.swt.dnd.TransferData;
  24 import org.eclipse.ui.navigator.CommonDropAdapter;
  25 import org.eclipse.ui.navigator.CommonDropAdapterAssistant;
  26
  27 import eu.etaxonomy.cdm.model.taxon.Taxon;
  28 import eu.etaxonomy.taxeditor.model.NameUtil;
  29 import eu.etaxonomy.taxeditor.model.TaxonUtil;
  30 import eu.etaxonomy.taxeditor.navigation.NavigationUtil;
  31 import eu.etaxonomy.taxeditor.operations.MoveTaxonOperation;
  32
  33 /**
  34  * @author p.ciardelli
  35  * @created 03.06.2009
  36  * @version 1.0
  37  */
  38 public class TaxonDropAdapterAssistant extends CommonDropAdapterAssistant {
  39         private static final Logger logger = Logger
  40                         .getLogger(TaxonDropAdapterAssistant.class);
  41
  42         public static final String ID = "eu.etaxonomy.taxeditor.navigation.navigator.dropassistant"; //$NON-NLS-1$
  43
  44         /* (non-Javadoc)
  45          * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#handleDrop(org.eclipse.ui.navigator.CommonDropAdapter, org.eclipse.swt.dnd.DropTargetEvent, java.lang.Object)
  46          */
  47         @Override
  48         public IStatus handleDrop(CommonDropAdapter dropAdapter,
  49                         DropTargetEvent dropTargetEvent, Object target) {
  50
  51                 ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
  52                 if (selection instanceof TreeSelection) {
  53                         Object element = ((TreeSelection) selection).getFirstElement();
  54                         if (element instanceof Taxon) {
  55                                 Taxon childTaxon = (Taxon) element;
  56                                 if (target instanceof Taxon) {
  57                                         Taxon parentTaxon = (Taxon) target;
  58
  59                                         return moveTaxon(childTaxon, parentTaxon);
  60                                 }
  61                         }
  62                 }
  63
  64 //              IContainer target = getActualTarget((IResource) dropAdapter
  65 //                              .getCurrentTarget());
  66 //              IContainer target =
  67 //              if (target != null && target.isAccessible()) {
  68 //                      try {
  69 //                              target.refreshLocal(IResource.DEPTH_ONE, null);
  70 //                      } catch (CoreException e) {
  71 //                      }
  72 //              }
  73
  74                 return Status.CANCEL_STATUS;
  75         }
  76
  77         /* (non-Javadoc)
  78          * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#validateDrop(java.lang.Object, int, org.eclipse.swt.dnd.TransferData)
  79          */
  80         @Override
  81         public IStatus validateDrop(Object target, int operation,
  82                         TransferData transferType) {
  83                 if (target instanceof Taxon) {
  84                         return Status.OK_STATUS;
  85                 }
  86                 return Status.CANCEL_STATUS;
  87         }
  88
  89
  90         /**
  91          * @param childTaxon
  92          * @param parentTaxon
  93          * @return
  94          */
  95         private IStatus moveTaxon(Taxon childTaxon, Taxon newParentTaxon) {
  96
  97                 // Make sure parentTaxon is not a child
  98                 if (TaxonUtil.isTaxonChildOfTaxon(newParentTaxon, childTaxon)) {
  99
 100                         MessageDialog.openError(NavigationUtil.getShell(), "Can't move taxon.",
 101                                         "'" + NameUtil.getDisplayName(childTaxon) + "' sits above " +
 102                                         "'" + NameUtil.getDisplayName(newParentTaxon) + "' " +
 103                                         "in the taxonomic hierarchy.");
 104
 105                         return Status.CANCEL_STATUS;
 106                 }
 107
 108                 // Make sure taxon is not being dropped onto itself
 109                 if (childTaxon.equals(newParentTaxon)) {
 110                         return Status.CANCEL_STATUS;
 111                 }
 112
 113                 // Make sure parent taxon does not have unsaved changes
 114                 if (NavigationUtil.isDirty(newParentTaxon)){
 115                         MessageDialog.openWarning(NavigationUtil.getShell(), "Unsaved Parent Taxon", "There are unsaved " +
 116                         "changes in the parent taxon. Pleas save first.");
 117                         return Status.CANCEL_STATUS;
 118                 }
 119
 120                 IUndoContext workspaceUndoContext = NavigationUtil.getWorkbenchUndoContext();
 121                 if (workspaceUndoContext == null) {
 122                         logger.error("Workspace undo context is null. DND operation cancelled");
 123                         return Status.CANCEL_STATUS;
 124                 }
 125                 IUndoableOperation operation = new MoveTaxonOperation
 126                                 ("Move Taxon", workspaceUndoContext, childTaxon, newParentTaxon);
 127                 NavigationUtil.executeOperation(operation);
 128
 129                 logger.info("Moved taxon " + childTaxon + " to new parent " + newParentTaxon);
 130
 131                 NavigationUtil.selectInNavigator(childTaxon, newParentTaxon);
 132
 133                 return Status.OK_STATUS;
 134         }
 135 }