eu.etaxonomy.taxeditor.editor/src/main/java/eu/etaxonomy/taxeditor/editor/view/media/operation/MoveMediaInListOperation.java

   1 /**
   2 * Copyright (C) 2007 EDIT
   3 * European Distributed Institute of Taxonomy
   4 * http://www.e-taxonomy.eu
   5 *
   6 * The contents of this file are subject to the Mozilla Public License Version 1.1
   7 * See LICENSE.TXT at the top of this package for the full license terms.
   8 */
   9 package eu.etaxonomy.taxeditor.editor.view.media.operation;
  10
  11 import java.util.Collections;
  12 import java.util.List;
  13 import java.util.Set;
  14
  15 import org.eclipse.core.commands.ExecutionException;
  16 import org.eclipse.core.commands.operations.IUndoContext;
  17 import org.eclipse.core.runtime.IAdaptable;
  18 import org.eclipse.core.runtime.IProgressMonitor;
  19 import org.eclipse.core.runtime.IStatus;
  20
  21 import eu.etaxonomy.cdm.model.description.DescriptionBase;
  22 import eu.etaxonomy.cdm.model.description.DescriptionElementBase;
  23 import eu.etaxonomy.cdm.model.media.Media;
  24 import eu.etaxonomy.cdm.model.taxon.Taxon;
  25 import eu.etaxonomy.taxeditor.editor.l10n.Messages;
  26 import eu.etaxonomy.taxeditor.model.MessagingUtils;
  27 import eu.etaxonomy.taxeditor.operation.AbstractPostTaxonOperation;
  28 import eu.etaxonomy.taxeditor.operation.IPostOperationEnabled;
  29
  30 /**
  31  * <p>MoveMediaInListOperation class.</p>
  32  *
  33  * @author p.ciardelli
  34  * @created 05.02.2009
  35  */
  36 public class MoveMediaInListOperation extends AbstractPostTaxonOperation {
  37
  38         /** Constant <code>UP=1</code> */
  39         public static final int UP = -1;
  40         /** Constant <code>DOWN=-1</code> */
  41         public static final int DOWN = 1;
  42
  43         private DescriptionBase<?> description;
  44         private Media media;
  45         private int direction;
  46
  47         /**
  48          * <p>Constructor for MoveMediaInListOperation.</p>
  49          *
  50          * @param undoContext a {@link org.eclipse.core.commands.operations.IUndoContext} object.
  51          * @param taxon a {@link eu.etaxonomy.cdm.model.taxon.Taxon} object.
  52          * @param label a {@link java.lang.String} object.
  53          * @param description a {@link eu.etaxonomy.cdm.model.description.DescriptionBase} object.
  54          * @param media a {@link eu.etaxonomy.cdm.model.media.Media} object.
  55          * @param direction a int.
  56          * @param postOperationEnabled a {@link eu.etaxonomy.taxeditor.operation.IPostOperationEnabled} object.
  57          */
  58         public MoveMediaInListOperation(String label, IUndoContext undoContext,
  59                         Taxon taxon, DescriptionBase description, Media media,
  60                         int direction, IPostOperationEnabled postOperationEnabled) {
  61                 super(label, undoContext, taxon, postOperationEnabled);
  62
  63                 this.description = description;
  64                 this.media = media;
  65                 this.direction = direction;
  66         }
  67
  68         @Override
  69         public IStatus execute(IProgressMonitor monitor, IAdaptable info)
  70                         throws ExecutionException {
  71
  72                 monitor.worked(20);
  73
  74                 moveMedia(description, media, direction);
  75                 monitor.worked(40);
  76
  77                 return postExecute(media);
  78         }
  79
  80         @Override
  81         public IStatus redo(IProgressMonitor monitor, IAdaptable info)
  82                         throws ExecutionException {
  83                 return execute(monitor, info);
  84         }
  85
  86         @Override
  87         public IStatus undo(IProgressMonitor monitor, IAdaptable info)
  88                         throws ExecutionException {
  89                 moveMedia(description, media, direction * -1);
  90                 return postExecute(media);
  91         }
  92
  93         private void moveMedia(DescriptionBase<?> description, Media media, int direction){
  94                 Set<DescriptionElementBase> elements = description.getElements();
  95
  96                 if(elements.size() != 1){
  97                         MessagingUtils.error(this.getClass(), Messages.MoveMediaInListOperation_MORE_DESC, null);
  98                 }
  99
 100                 DescriptionElementBase element = elements.iterator().next();
 101
 102                 List<Media> medias = element.getMedia();
 103
 104                 int index = medias.indexOf(media);
 105                 int newIndex = index + direction;
 106
 107                 if(index < 0){
 108                         return;
 109                 }
 110
 111                 if (newIndex >= 0 && newIndex < medias.size()) {
 112                         try{
 113                                 Collections.swap(medias, newIndex, index);
 114                         }catch(ArrayIndexOutOfBoundsException e){
 115                                 MessagingUtils.error(this.getClass(), e);
 116                         }
 117                 }
 118         }
 119 }