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