| # 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 |