| # 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.caching import cachedmethod |
| from aria.parser.presentation import (Presentation, has_fields, primitive_dict_field) |
| |
| |
| @has_fields |
| class ExtensiblePresentation(Presentation): |
| """ |
| A presentation that supports an optional ``_extensions`` dict field. |
| """ |
| |
| @primitive_dict_field() |
| def _extensions(self): |
| pass |
| |
| @cachedmethod |
| def _get_extension(self, name, default=None): |
| extensions = self._extensions |
| return extensions.get(name, default) if extensions is not None else None # pylint: disable=no-member |