1 # Protocol Buffers - Google's data interchange format
2 # Copyright 2008 Google Inc. All rights reserved.
3 # https://developers.google.com/protocol-buffers/
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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.
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13 # in the documentation and/or other materials provided with the
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17 # this software without specific prior written permission.
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31 """Protocol message implementation hooks for C++ implementation.
33 Contains helper functions used to create protocol message classes from
34 Descriptor objects at runtime backed by the protocol buffer C++ API.
37 __author__ = 'tibell@google.com (Johan Tibell)'
39 from google.protobuf.pyext import _message
40 from google.protobuf import message
43 def NewMessage(bases, message_descriptor, dictionary):
44 """Creates a new protocol message *class*."""
47 if base is message.Message:
48 # _message.Message must come before message.Message as it
49 # overrides methods in that class.
50 new_bases.append(_message.Message)
51 new_bases.append(base)
52 return tuple(new_bases)
55 def InitMessage(message_descriptor, cls):
56 """Constructs a new message instance (called before instance's __init__)."""
58 def SubInit(self, **kwargs):
59 super(cls, self).__init__(message_descriptor, **kwargs)
60 cls.__init__ = SubInit
61 cls.AddDescriptors(message_descriptor)