| # 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) |