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#!/usr/bin/python
#
# Copyright 2012 Google Inc. All Rights Reserved.
#
# Licensed 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.
"""Functionality to allow easily retrieving the right definition generator."""
__author__ = 'msu@google.com (Martin Suess)'
import dns_generator
class Error(Exception):
"""Base error class."""
class GeneratorIdentificationError(Error):
"""Exception to use when GeneratorFactory fails to identify the Generator."""
class GeneratorFactory(object):
"""Functionality to get a definition generator easily based on its name."""
def __init__(self):
"""Initializer."""
self._generators = {
'DnsGenerator': dns_generator.DnsGenerator,
}
def GetGenerator(self, identifier):
"""Returns a specific generator instance based on the identifier.
Args:
identifier: String identifier for the generator to get.
Raises:
GeneratorIdentificationError: If the generator cannot be identified.
Returns:
Generator instance based on the identifier passed in.
"""
if identifier not in self._generators:
raise GeneratorIdentificationError(
'Generator \'%s\' could not be identified.' % identifier)
return self._generators[identifier]()
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