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authorJohan Lundberg <lundberg@nordu.net>2015-04-02 10:43:33 +0200
committerJohan Lundberg <lundberg@nordu.net>2015-04-02 10:43:33 +0200
commitbd611ac59f7c4db885a2f8631ef0bcdcd1901ca0 (patch)
treee60f5333a7699cd021b33c7f5292af55b774001b /definate/generator_factory.py
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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]()