| # Licensed to the Apache Software Foundation (ASF) under one or more |
| # contributor license agreements. See the NOTICE file distributed with |
| # this work for additional information regarding copyright ownership. |
| # The ASF licenses this file to You under the Apache License, Version 2.0 |
| # (the "License"); you may not use this file except in compliance with |
| # the License. You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| |
| from aria.utils.formatting import safe_repr |
| from aria.utils.type import full_type_name |
| from aria.parser.exceptions import InvalidValueError |
| from aria.parser.presentation import NULL |
| |
| |
| def data_type_class_getter(cls, allow_null=False): |
| """ |
| Wraps the field value in a specialized data type class. |
| |
| Can be used with the :func:`field_getter` decorator. |
| """ |
| |
| def getter(field, presentation, context=None): |
| raw = field.default_get(presentation, context) |
| if (raw is None) or (allow_null and (raw is NULL)): |
| return raw |
| try: |
| return cls(None, None, raw, None) |
| except ValueError as e: |
| raise InvalidValueError( |
| u'{0} is not a valid "{1}" in "{2}": {3}' |
| .format(field.full_name, full_type_name(cls), presentation._name, |
| safe_repr(raw)), |
| cause=e, locator=field.get_locator(raw)) |
| return getter |
