EDIT

 */

public class DistributionContentProvider extends TermContentProvider {

    @Override

    public Object[] getChildren(Object parentElement) {

        Set<NamedAreaWrapper> allChildrenWrapper = new HashSet();

        return null;

    }

    /**

    *

    * @param vocabulary

       return topLevelTerms.toArray();

   }

   @Override

   public Object getParent(Object element) {

       if(element instanceof NamedAreaWrapper){

           if (((NamedAreaWrapper)element).parent!= null){

               return ((NamedAreaWrapper)element).parent;

   }

   @Override

   public boolean hasChildren(Object element) {

       if (element instanceof TermVocabulary){

           return false;

       }

       return false;

   }

}