eu.etaxonomy.taxeditor.navigation/src/main/java/eu/etaxonomy/taxeditor/navigation/navigator/TreeNodeDropAdapterAssistant.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 java.util.HashSet;
  14 import java.util.Iterator;
  15 import java.util.Set;
  16
  17 import org.apache.log4j.Logger;
  18 import org.eclipse.core.commands.operations.IUndoContext;
  19 import org.eclipse.core.runtime.IStatus;
  20 import org.eclipse.core.runtime.Status;
  21 import org.eclipse.jface.dialogs.MessageDialog;
  22 import org.eclipse.jface.util.LocalSelectionTransfer;
  23 import org.eclipse.jface.viewers.ISelection;
  24 import org.eclipse.jface.viewers.TreeSelection;
  25 import org.eclipse.swt.dnd.DropTargetEvent;
  26 import org.eclipse.swt.dnd.TransferData;
  27 import org.eclipse.ui.navigator.CommonDropAdapter;
  28 import org.eclipse.ui.navigator.CommonDropAdapterAssistant;
  29
  30 import eu.etaxonomy.cdm.model.common.CdmBase;
  31 import eu.etaxonomy.cdm.model.taxon.ITreeNode;
  32 import eu.etaxonomy.cdm.model.taxon.TaxonNode;
  33 import eu.etaxonomy.taxeditor.navigation.NavigationUtil;
  34 import eu.etaxonomy.taxeditor.navigation.navigator.operation.MoveTaxonOperation;
  35 import eu.etaxonomy.taxeditor.operation.AbstractPostOperation;
  36 import eu.etaxonomy.taxeditor.operation.IPostOperationEnabled;
  37
  38 /**
  39  * <p>TaxonNodeDropAdapterAssistant class.</p>
  40  *
  41  * @author p.ciardelli
  42  * @created 03.06.2009
  43  * @version 1.0
  44  */
  45 public class TreeNodeDropAdapterAssistant extends CommonDropAdapterAssistant implements IPostOperationEnabled{
  46         private static final Logger logger = Logger
  47                         .getLogger(TreeNodeDropAdapterAssistant.class);
  48
  49         /** Constant <code>ID="eu.etaxonomy.taxeditor.navigation.navig"{trunked}</code> */
  50         public static final String ID = "eu.etaxonomy.taxeditor.navigation.navigator.dropassistant"; //$NON-NLS-1$
  51
  52         /* (non-Javadoc)
  53          * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#handleDrop(org.eclipse.ui.navigator.CommonDropAdapter, org.eclipse.swt.dnd.DropTargetEvent, java.lang.Object)
  54          */
  55         /** {@inheritDoc} */
  56         @Override
  57         public IStatus handleDrop(CommonDropAdapter dropAdapter,
  58                         DropTargetEvent dropTargetEvent, Object target) {
  59
  60                 if (target instanceof ITreeNode) {
  61                         Set<TaxonNode> taxonNodes = getSelectedTaxa();
  62                         ITreeNode targetTreeNode = (ITreeNode) target;
  63                         if(taxonNodes != null)
  64                                 return moveTaxon(taxonNodes, targetTreeNode);
  65                 }
  66
  67                 return Status.CANCEL_STATUS;
  68         }
  69
  70         private Set<TaxonNode> getSelectedTaxa(){
  71                 HashSet<TaxonNode> taxonNodes = new HashSet<TaxonNode>();
  72
  73                 ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
  74                 if (selection instanceof TreeSelection) {
  75
  76                         Iterator selectionIterator = ((TreeSelection) selection).iterator();
  77
  78                         while (selectionIterator.hasNext()){
  79                                 Object object = selectionIterator.next();
  80                                 if(object instanceof TaxonNode){
  81                                         TaxonNode taxonNode = (TaxonNode) object;
  82                                         taxonNodes.add(taxonNode);
  83                                 }
  84                         }
  85                 }
  86                 return taxonNodes.size() > 0 ? taxonNodes : null;
  87         }
  88
  89         /* (non-Javadoc)
  90          * @see org.eclipse.ui.navigator.CommonDropAdapterAssistant#validateDrop(java.lang.Object, int, org.eclipse.swt.dnd.TransferData)
  91          */
  92         /** {@inheritDoc} */
  93         @Override
  94         public IStatus validateDrop(Object target, int operation,
  95                         TransferData transferType) {
  96                 if (target instanceof ITreeNode) {
  97                         // do not allow to drop onto itself
  98                         for(TaxonNode taxonNode : getSelectedTaxa()){
  99                                 if (taxonNode.equals(target)) {
 100                                         return Status.CANCEL_STATUS;
 101                                 }
 102                         }
 103                         return Status.OK_STATUS;
 104                 }
 105                 return Status.CANCEL_STATUS;
 106         }
 107
 108
 109         /**
 110          * @param childTaxonNode
 111          * @param parentTaxon
 112          * @return
 113          */
 114         private IStatus moveTaxon(Set<TaxonNode> taxonNodes, ITreeNode targetITreeNode) {
 115
 116                 TaxonNavigator taxonNavigator;
 117                 taxonNavigator = (TaxonNavigator) NavigationUtil.showView(TaxonNavigator.ID);
 118
 119                 if(targetITreeNode instanceof TaxonNode){
 120
 121                         TaxonNode targetTaxonNode = (TaxonNode) targetITreeNode;
 122
 123 //                      for(TaxonNode taxonNode : taxonNodes){
 124 //                              if (taxonNode.equals(targetTaxonNode)) {
 125 //                                      return Status.CANCEL_STATUS;
 126 //                              }
 127 //                      }
 128
 129                         // Make sure parent taxon does not have unsaved changes
 130                         if (NavigationUtil.isDirty(targetTaxonNode)){
 131                                 MessageDialog.openWarning(NavigationUtil.getShell(), "Unsaved Parent Taxon", "There are unsaved " +
 132                                 "changes in the parent taxon. Pleas save first.");
 133                                 return Status.CANCEL_STATUS;
 134                         }
 135
 136
 137                         // Make sure parentTaxon is not the drop target
 138 //                      if (!childTaxonNode.isTopmostNode() && childTaxonNode.getParent().equals(targetTaxonNode)){
 139 //                              return Status.CANCEL_STATUS;
 140 //                      }
 141
 142                         // Make sure taxon is not being dropped onto itself
 143 //                      if (childTaxonNode.equals(targetTaxonNode)) {
 144 //                              return Status.CANCEL_STATUS;
 145 //                      }
 146
 147
 148
 149                 }
 150
 151                 IUndoContext workspaceUndoContext = NavigationUtil.getWorkbenchUndoContext();
 152                 if (workspaceUndoContext == null) {
 153                         logger.error("Workspace undo context is null. DND operation cancelled");
 154                         return Status.CANCEL_STATUS;
 155                 }
 156
 157                 AbstractPostOperation operation = new MoveTaxonOperation
 158                                 ("Move Taxon", workspaceUndoContext, taxonNodes, targetITreeNode, this, taxonNavigator);
 159                 NavigationUtil.executeOperation(operation);
 160
 161                 logger.info("Moved taxa to new parent " + targetITreeNode);
 162                 return Status.OK_STATUS;
 163         }
 164
 165         /* (non-Javadoc)
 166          * @see eu.etaxonomy.taxeditor.operations.IPostOperationEnabled#postOperation(eu.etaxonomy.cdm.model.common.CdmBase)
 167          */
 168         /** {@inheritDoc} */
 169         public boolean postOperation(CdmBase objectAffectedByOperation) {
 170                 return true;
 171         }
 172
 173         /**
 174          * <p>onComplete</p>
 175          *
 176          * @return a boolean.
 177          */
 178         public boolean onComplete() {
 179                 // TODO Auto-generated method stub
 180                 return false;
 181         }
 182 }