taxeditor-navigation/src/main/java/eu/etaxonomy/taxeditor/navigation/taxonomictree/TaxonomicTreeContentProvider.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 package eu.etaxonomy.taxeditor.navigation.taxonomictree;
  10
  11 import java.util.List;
  12
  13 import org.eclipse.core.runtime.Assert;
  14 import org.eclipse.jface.viewers.ITreeContentProvider;
  15 import org.eclipse.jface.viewers.Viewer;
  16
  17 import eu.etaxonomy.cdm.model.taxon.Taxon;
  18
  19 /**
  20  * TODO maybe we want to implement ILazyTreeContentProvider
  21  *
  22  * @author p.ciardelli
  23  * @created 27.06.2008
  24  * @version 1.0
  25  * @author n.hoffmann
  26  */
  27 public class TaxonomicTreeContentProvider implements ITreeContentProvider {
  28
  29         /*
  30          * (non-Javadoc)
  31          *
  32          * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
  33          */
  34         public Object[] getChildren(Object parentElement) {
  35
  36                 String errorMessage = "getChildren(parentElement) called with non-Taxon element.";
  37
  38                 // Make sure we are dealing with taxon objects
  39                 Assert.isTrue(parentElement instanceof Taxon, errorMessage);
  40
  41                 if (parentElement instanceof Taxon) {
  42                         return ((Taxon) parentElement).getTaxonomicChildren().toArray();
  43                 }
  44
  45                 return null;
  46         }
  47
  48         /*
  49          * (non-Javadoc)
  50          *
  51          * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
  52          */
  53         public Object getParent(Object element) {
  54
  55                 Assert.isTrue(element instanceof Taxon,
  56                                 "getParent(element) called with non-Taxon element.");
  57
  58                 return ((Taxon) element).getTaxonomicParent();
  59         }
  60
  61         /*
  62          * (non-Javadoc)
  63          *
  64          * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
  65          */
  66         public boolean hasChildren(Object element) {
  67                 Assert.isTrue(element instanceof Taxon,
  68                                 "hasChildren(element) called with non-Taxon element.");
  69
  70                 return ((Taxon) element).getTaxonomicChildrenCount() > 0;
  71         }
  72
  73
  74         /*
  75          * (non-Javadoc)
  76          *
  77          * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
  78          */
  79         @SuppressWarnings("unchecked")
  80         public Object[] getElements(Object inputElement) {
  81                 List<Taxon> rootTaxa = (List<Taxon>) inputElement;
  82                 return rootTaxa.toArray();
  83         }
  84
  85         /*
  86          * (non-Javadoc)
  87          *
  88          * @see org.eclipse.jface.viewers.IContentProvider#dispose()
  89          */
  90         public void dispose() {}
  91
  92         /*
  93          * (non-Javadoc)
  94          *
  95          * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
  96          *      java.lang.Object, java.lang.Object)
  97          */
  98         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  99         }
 100 }