eu.etaxonomy.taxeditor.navigation/src/main/java/eu/etaxonomy/taxeditor/navigation/navigator/TaxonNodeContentProvider.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
  10 package eu.etaxonomy.taxeditor.navigation.navigator;
  11
  12 import java.util.List;
  13
  14 import org.apache.log4j.Logger;
  15 import org.eclipse.jface.viewers.ITreeContentProvider;
  16 import org.eclipse.jface.viewers.Viewer;
  17
  18 import eu.etaxonomy.cdm.hibernate.HHH_9751_Util;
  19 import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;
  20 import eu.etaxonomy.cdm.model.taxon.ITaxonTreeNode;
  21 import eu.etaxonomy.cdm.model.taxon.TaxonNode;
  22
  23 /**
  24  * <p>TaxonNodeContentProvider class.</p>
  25  *
  26  * @author p.ciardelli
  27  * @created 02.06.2009
  28  * @version 1.0
  29  */
  30 public class TaxonNodeContentProvider implements ITreeContentProvider {
  31         private static final Logger logger = Logger
  32                         .getLogger(TaxonNodeContentProvider.class);
  33
  34         private static final Object[] NO_CHILDREN = new Object[0];
  35
  36         /** {@inheritDoc} */
  37         @Override
  38     public Object[] getChildren(Object parentElement) {
  39                 Object[] children = null;
  40
  41                 if(parentElement instanceof ITaxonTreeNode){
  42                     ITaxonTreeNode treeNode = (ITaxonTreeNode) HibernateProxyHelper.deproxy(parentElement);
  43                         List<TaxonNode> childrenSet = treeNode.getChildNodes();
  44                         HHH_9751_Util.removeAllNull(childrenSet);
  45                         children = childrenSet.toArray();
  46
  47                 }
  48
  49                 return children != null ? children : NO_CHILDREN;
  50         }
  51
  52         /** {@inheritDoc} */
  53         @Override
  54     public Object getParent(Object element) {
  55                 if(element instanceof TaxonNode){
  56                         return ((TaxonNode) element).getParent();
  57                 }
  58                 return null;
  59         }
  60
  61         /** {@inheritDoc} */
  62         @Override
  63     public boolean hasChildren(Object element) {
  64                 if(element instanceof TaxonNode){
  65                         return ((TaxonNode) element).getCountChildren() > 0;
  66                 }
  67                 return getChildren(element).length > 0;
  68         }
  69
  70         /** {@inheritDoc} */
  71         @Override
  72     public Object[] getElements(Object inputElement) {
  73                 return this.getChildren(inputElement);
  74         }
  75
  76         /**
  77          * <p>dispose</p>
  78          */
  79         @Override
  80     public void dispose() {
  81         }
  82
  83         /** {@inheritDoc} */
  84         @Override
  85     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  86         }
  87 }