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# 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
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