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author | liujisi@google.com <liujisi@google.com@630680e5-0e50-0410-840e-4b1c322b438d> | 2010-11-02 13:14:58 +0000 |
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committer | liujisi@google.com <liujisi@google.com@630680e5-0e50-0410-840e-4b1c322b438d> | 2010-11-02 13:14:58 +0000 |
commit | 33165fe0d5c265c92f2a67fc2b437b567c24e294 (patch) | |
tree | 52def0850ddd2e976da238d1a437fbda79c96e44 /python/google/protobuf/internal/api_implementation.py | |
parent | 80aa23df6c63750e8cdfdcf3996fbc37d63cac61 (diff) | |
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Diffstat (limited to 'python/google/protobuf/internal/api_implementation.py')
-rwxr-xr-x | python/google/protobuf/internal/api_implementation.py | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/python/google/protobuf/internal/api_implementation.py b/python/google/protobuf/internal/api_implementation.py new file mode 100755 index 00000000..b3e412e2 --- /dev/null +++ b/python/google/protobuf/internal/api_implementation.py @@ -0,0 +1,64 @@ +# Protocol Buffers - Google's data interchange format +# Copyright 2008 Google Inc. All rights reserved. +# http://code.google.com/p/protobuf/ +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: +# +# * Redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer. +# * Redistributions in binary form must reproduce the above +# copyright notice, this list of conditions and the following disclaimer +# in the documentation and/or other materials provided with the +# distribution. +# * Neither the name of Google Inc. nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +""" +This module is the central entity that determines which implementation of the +API is used. +""" + +__author__ = 'petar@google.com (Petar Petrov)' + +import os +# This environment variable can be used to switch to a certain implementation +# of the Python API. Right now only 'python' and 'cpp' are valid values. Any +# other value will be ignored. +_implementation_type = os.getenv('PROTOCOL_BUFFERS_PYTHON_IMPLEMENTATION', + 'python') + + +if _implementation_type != 'python': + # For now, by default use the pure-Python implementation. + # The code below checks if the C extension is available and + # uses it if it is available. + _implementation_type = 'cpp' + ## Determine automatically which implementation to use. + #try: + # from google.protobuf.internal import cpp_message + # _implementation_type = 'cpp' + #except ImportError, e: + # _implementation_type = 'python' + + +# Usage of this function is discouraged. Clients shouldn't care which +# implementation of the API is in use. Note that there is no guarantee +# that differences between APIs will be maintained. +# Please don't use this function if possible. +def Type(): + return _implementation_type |