1
# Protocol Buffers - Google's data interchange format
2
# Copyright 2008 Google Inc. All rights reserved.
3
# http://code.google.com/p/protobuf/
5
# Redistribution and use in source and binary forms, with or without
6
# modification, are permitted provided that the following conditions are
9
# * Redistributions of source code must retain the above copyright
10
# notice, this list of conditions and the following disclaimer.
11
# * Redistributions in binary form must reproduce the above
12
# copyright notice, this list of conditions and the following disclaimer
13
# in the documentation and/or other materials provided with the
15
# * Neither the name of Google Inc. nor the names of its
16
# contributors may be used to endorse or promote products derived from
17
# this software without specific prior written permission.
19
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32
This module is the central entity that determines which implementation of the
36
__author__ = 'petar@google.com (Petar Petrov)'
39
# This environment variable can be used to switch to a certain implementation
40
# of the Python API. Right now only 'python' and 'cpp' are valid values. Any
41
# other value will be ignored.
42
_implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION',
46
if _implementation_type != 'python':
47
# For now, by default use the pure-Python implementation.
48
# The code below checks if the C extension is available and
49
# uses it if it is available.
50
_implementation_type = 'cpp'
51
## Determine automatically which implementation to use.
53
# from google.protobuf.internal import cpp_message
54
# _implementation_type = 'cpp'
55
#except ImportError, e:
56
# _implementation_type = 'python'
59
# Usage of this function is discouraged. Clients shouldn't care which
60
# implementation of the API is in use. Note that there is no guarantee
61
# that differences between APIs will be maintained.
62
# Please don't use this function if possible.
64
return _implementation_type
added
removed
python/google/protobuf/internal/api_implementation.py
