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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 ...extension import parser
from .exceptions import PresenterNotFoundError
class PresenterSource(object):
"""
Base class for ARIA presenter sources.
Presenter sources provide appropriate :class:`Presenter` classes for agnostic raw data.
"""
def get_presenter(self, raw): # pylint: disable=unused-argument,no-self-use
raise PresenterNotFoundError('presenter not found')
class DefaultPresenterSource(PresenterSource):
"""
The default ARIA presenter source.
"""
def __init__(self, classes=None):
if classes is None:
classes = parser.presenter_class()
self.classes = classes
def get_presenter(self, raw):
for cls in self.classes:
if cls.can_present(raw):
return cls
if 'tosca_definitions_version' in raw:
if raw['tosca_definitions_version'] is None:
raise PresenterNotFoundError("'tosca_definitions_version' is not specified")
if not isinstance(raw['tosca_definitions_version'], basestring):
raise PresenterNotFoundError("'tosca_definitions_version' is not a string")
if not raw['tosca_definitions_version']:
raise PresenterNotFoundError("'tosca_definitions_version' is not specified")
return super(DefaultPresenterSource, self).get_presenter(raw)
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