return visitor;
        }

        @Override
        public Service getFactory(Class<?> elementType) {
            if (!isFactory(serviceType, elementType)) {
                return null;
            }
            return prepare();
        }

        private boolean isFactory(Type type, Class<?> elementType) {
            Class<?> c = unwrap(type);
            if (!Factory.class.isAssignableFrom(c)) {