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