public Object[] getElements(Object inputElement) {
   // model = (ISite) inputElement;
   ArrayList<IWritable> result = new ArrayList<IWritable>();
   ISiteCategoryDefinition[] catDefs = fModel.getSite().getCategoryDefinitions();
   for (int i = 0; i < catDefs.length; i++) {
     result.add(catDefs[i]);
   }
   ISiteFeature[] features = fModel.getSite().getFeatures();
   for (int i = 0; i < features.length; i++) {
     if (features[i].getCategories().length == 0)
       result.add(new SiteFeatureAdapter(null, features[i]));
   }
   return result.toArray();
 }
 private ISiteFeature[] getFeaturesFromSelection(IStructuredSelection sel) {
   if (sel.isEmpty()) return new ISiteFeature[0];
   if (cachedSelection == sel) return cachedFeatures;
   cachedSelection = sel;
   ArrayList<ISiteFeature> features = new ArrayList<ISiteFeature>(sel.size());
   Iterator<?> iterator = sel.iterator();
   while (iterator.hasNext()) {
     Object next = iterator.next();
     if (next instanceof SiteFeatureAdapter) {
       if ((((SiteFeatureAdapter) next).feature) != null) {
         features.add(((SiteFeatureAdapter) next).feature);
       }
     }
   }
   cachedFeatures = features.toArray(new ISiteFeature[features.size()]);
   return cachedFeatures;
 }