| # 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. |
| |
| """ |
| Utilities for working with open/close patterns. |
| """ |
| |
| class OpenClose(object): |
| """ |
| Wraps an object that has ``open()`` and ``close()`` methods to support the ``with`` keyword. |
| """ |
| |
| def __init__(self, wrapped): |
| self.wrapped = wrapped |
| |
| def __enter__(self): |
| if hasattr(self.wrapped, 'open'): |
| self.wrapped.open() |
| return self.wrapped |
| |
| def __exit__(self, the_type, value, traceback): |
| if hasattr(self.wrapped, 'close'): |
| self.wrapped.close() |
| return False |
