1 # Licensed to the Apache Software Foundation (ASF) under one or more
2 # contributor license agreements. See the NOTICE file distributed with
3 # this work for additional information regarding copyright ownership.
4 # The ASF licenses this file to You under the Apache License, Version 2.0
5 # (the "License"); you may not use this file except in compliance with
6 # the License. You may obtain a copy of the License at
8 # http://www.apache.org/licenses/LICENSE-2.0
10 # Unless required by applicable law or agreed to in writing, software
11 # distributed under the License is distributed on an "AS IS" BASIS,
12 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 # See the License for the specific language governing permissions and
14 # limitations under the License.
16 from aria.utils.caching import cachedmethod
17 from aria.parser.presentation import (Presentation, has_fields, primitive_dict_field)
21 class ExtensiblePresentation(Presentation):
23 A presentation that supports an optional ``_extensions`` dict field.
26 @primitive_dict_field()
27 def _extensions(self):
31 def _get_extension(self, name, default=None):
32 extensions = self._extensions
33 return extensions.get(name, default) if extensions is not None else None # pylint: disable=no-member