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# 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
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