| #!/usr/bin/env python |
| # |
| # Copyright 2007 Google Inc. |
| # |
| # 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. |
| # |
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| """Base operation class.""" |
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| __all__ = ['Operation'] |
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| |
| class Operation(object): |
| """Base class for all mapper operations. |
| |
| All operations should implement __call__(self, ctx) function, which will be |
| called upon operation yield. |
| """ |
| |
| def __call__(self, ctx): |
| raise NotImplementedError("__call__() not implemented in %s" % |
| self.__class__) |
