Optional <Method> callMethod = ROUTE_METHODS.get (routeAnnotation).stream ()
                                     . map (m -> Pair.mp (m, m.getAnnotation (routeAnnotation)))
                                     . filter (p -> namespace.matches (p.S.namespace ()))
                                     . filter (p -> author.matches (p.S.author ()))
                                     . filter (p -> room.matches   (p.S.room ()))