code: public List<FilterType<PortletAppType<T>>> getAllFilter()
     {
        List<FilterType<PortletAppType<T>>> list = new ArrayList<FilterType<PortletAppType<T>>>();
        List<Node> nodeList = childNode.get("filter");
        for(Node node: nodeList)
        {
           FilterType<PortletAppType<T>>  type = new FilterTypeImpl<PortletAppType<T>>(this, "filter", childNode, node);
           list.add(type);
        }
        return list;
     }
docs: Returns all <code>filter</code> elements
  @return list of <code>filter</code>