1#!/usr/bin/env python3 2# 3# Copyright 2019 - The Android Open Source Project 4# 5# Licensed under the Apache License, Version 2.0 (the "License"); 6# you may not use this file except in compliance with the License. 7# You may obtain a copy of the License at 8# 9# http://www.apache.org/licenses/LICENSE-2.0 10# 11# Unless required by applicable law or agreed to in writing, software 12# distributed under the License is distributed on an "AS IS" BASIS, 13# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14# See the License for the specific language governing permissions and 15# limitations under the License. 16 17from abc import ABC, abstractmethod 18 19 20class Closable(ABC): 21 22 def __enter__(self): 23 return self 24 25 def __exit__(self, type, value, traceback): 26 self.close() 27 return traceback is None 28 29 def __del__(self): 30 self.close() 31 32 @abstractmethod 33 def close(self): 34 pass 35 36 37def safeClose(closable): 38 if closable is not None: 39 closable.close() 40