public static String buildFilterID(String application_name, FilterType filter_type, String filter_name) {
        return application_name + ":" + filter_name + ":" + filter_type.toString();
    }
public static String buildFilterID ( String application_name , FilterType filter_type , String filter_name ) { return application_name + ":" + filter_name + ":" + filter_type . toString ( ) ; }
builds the unique filter_id key
@param application_name
@param filter_type
@param filter_name
@return key is application_name:filter_name:filter_type