60 lines
2.2 KiB
Python
60 lines
2.2 KiB
Python
# Copyright (c) 2013 Hortonworks, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os
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from sahara.utils import general
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class VersionHandlerFactory(object):
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versions = None
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modules = None
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initialized = False
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@staticmethod
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def get_instance():
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if not VersionHandlerFactory.initialized:
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src_dir = os.path.join(os.path.dirname(__file__), '')
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versions = [name[8:].replace('_', '.')
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for name in os.listdir(src_dir)
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if os.path.isdir(os.path.join(src_dir, name))
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and name.startswith('version_')]
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versions.sort(key=general.natural_sort_key)
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VersionHandlerFactory.versions = versions
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VersionHandlerFactory.modules = {}
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for version in VersionHandlerFactory.versions:
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module_name = ('sahara.plugins.hdp.versions.version_{0}.'
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'versionhandler'.format(
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version.replace('.', '_')))
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module_class = getattr(
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__import__(module_name, fromlist=['sahara']),
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'VersionHandler')
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module = module_class()
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# would prefer to use __init__ or some constructor, but keep
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# getting exceptions...
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module._set_version(version)
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VersionHandlerFactory.modules[version] = module
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VersionHandlerFactory.initialized = True
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return VersionHandlerFactory()
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def get_versions(self):
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return VersionHandlerFactory.versions
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def get_version_handler(self, version):
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return VersionHandlerFactory.modules[version]
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