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 import java.util.Set;
  13
  14 import org.apache.log4j.Logger;
  15 import org.eclipse.core.runtime.Assert;
  16 import org.eclipse.jface.viewers.ITreeContentProvider;
  17 import org.eclipse.jface.viewers.Viewer;
  18
  19 import eu.etaxonomy.cdm.model.taxon.Taxon;
  20
  21 /**
  22  * TODO maybe we want to implement ILazyTreeContentProvider
  23  *
  24  * @author p.ciardelli
  25  * @created 27.06.2008
  26  * @version 1.0
  27  * @author n.hoffmann
  28  */
  29 public class TaxonomicTreeContentProvider implements ITreeContentProvider {
  30         private static final Logger logger = Logger
  31                         .getLogger(TaxonomicTreeContentProvider.class);
  32
  33         /*
  34          * (non-Javadoc)
  35          *
  36          * @see org.eclipse.jface.viewers.ITreeContentProvider#getChildren(java.lang.Object)
  37          */
  38         public Object[] getChildren(Object parentElement) {
  39
  40                 String errorMessage = "getChildren(parentElement) called with non-Taxon element.";
  41
  42                 // Make sure we are dealing with taxon objects
  43                 Assert.isTrue(parentElement instanceof Taxon, errorMessage);
  44
  45                 if (parentElement instanceof Taxon) {
  46                         return ((Taxon) parentElement).getTaxonomicChildren().toArray();
  47                 }
  48
  49                 return null;
  50         }
  51
  52         private Set<Taxon> getTaxonChildren(Taxon parentTaxon) {
  53                 return parentTaxon.getTaxonomicChildren();
  54         }
  55
  56         /*
  57          * (non-Javadoc)
  58          *
  59          * @see org.eclipse.jface.viewers.ITreeContentProvider#getParent(java.lang.Object)
  60          */
  61         public Object getParent(Object element) {
  62
  63                 Assert.isTrue(element instanceof Taxon,
  64                                 "getParent(element) called with non-Taxon element.");
  65
  66                 return ((Taxon) element).getTaxonomicParent();
  67         }
  68
  69         /*
  70          * (non-Javadoc)
  71          *
  72          * @see org.eclipse.jface.viewers.ITreeContentProvider#hasChildren(java.lang.Object)
  73          */
  74         public boolean hasChildren(Object element) {
  75                 Assert.isTrue(element instanceof Taxon,
  76                                 "hasChildren(element) called with non-Taxon element.");
  77
  78                 return ((Taxon) element).getTaxonomicChildrenCount() > 0;
  79         }
  80
  81
  82         /*
  83          * (non-Javadoc)
  84          *
  85          * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
  86          */
  87         @SuppressWarnings("unchecked")
  88         public Object[] getElements(Object inputElement) {
  89                 List<Taxon> rootTaxa = (List<Taxon>) inputElement;
  90                 return rootTaxa.toArray();
  91         }
  92
  93         /*
  94          * (non-Javadoc)
  95          *
  96          * @see org.eclipse.jface.viewers.IContentProvider#dispose()
  97          */
  98         public void dispose() {}
  99
 100         /*
 101          * (non-Javadoc)
 102          *
 103          * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
 104          *      java.lang.Object, java.lang.Object)
 105          */
 106         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
 107         }
 108 }