eu.etaxonomy.taxeditor.navigation/src/main/java/eu/etaxonomy/taxeditor/navigation/navigator/TaxonNodeContentProvider.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.List;
  14
  15 import org.apache.log4j.Logger;
  16 import org.eclipse.jface.viewers.ITreeContentProvider;
  17 import org.eclipse.jface.viewers.Viewer;
  18
  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                         while (childrenSet.contains(null)){
  45                             childrenSet.remove(null);
  46                         }
  47                     children = childrenSet.toArray();
  48
  49                 }
  50
  51                 return children != null ? children : NO_CHILDREN;
  52         }
  53
  54         /** {@inheritDoc} */
  55         @Override
  56     public Object getParent(Object element) {
  57                 if(element instanceof TaxonNode){
  58                         return ((TaxonNode) element).getParent();
  59                 }
  60                 return null;
  61         }
  62
  63         /** {@inheritDoc} */
  64         @Override
  65     public boolean hasChildren(Object element) {
  66                 if(element instanceof TaxonNode){
  67                         return ((TaxonNode) element).getCountChildren() > 0;
  68                 }
  69                 return getChildren(element).length > 0;
  70         }
  71
  72         /** {@inheritDoc} */
  73         @Override
  74     public Object[] getElements(Object inputElement) {
  75                 return this.getChildren(inputElement);
  76         }
  77
  78         /**
  79          * <p>dispose</p>
  80          */
  81         @Override
  82     public void dispose() {
  83         }
  84
  85         /** {@inheritDoc} */
  86         @Override
  87     public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  88         }
  89 }