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