public Class<?> propertyTypeFor(Method method) {
            requireSingleParam(method);
            return method.getParameterTypes()[0];
        }

        @Override
        public Type genericPropertyTypeFor(Method method) {
            requireSingleParam(method);
            return method.getGenericParameterTypes()[0];
        }

        private void requireSingleParam(Method method) {
            if (!takesSingleParameter(method)) {