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