Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/google/protobuf/pyext/cpp_message.py: 88%

1# Protocol Buffers - Google's data interchange format 

2# Copyright 2008 Google Inc. All rights reserved. 

3# https://developers.google.com/protocol-buffers/ 

4# 

5# Redistribution and use in source and binary forms, with or without 

6# modification, are permitted provided that the following conditions are 

7# met: 

8# 

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 

14# distribution. 

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. 

18# 

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 

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25# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 

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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. 

30 

31"""Protocol message implementation hooks for C++ implementation. 

32 

33Contains helper functions used to create protocol message classes from 

34Descriptor objects at runtime backed by the protocol buffer C++ API. 

35""" 

36 

37__author__ = 'tibell@google.com (Johan Tibell)' 

38 

39from google.protobuf.internal import api_implementation 

40 

41 

42# pylint: disable=protected-access 

43_message = api_implementation._c_module 

44# TODO(jieluo): Remove this import after fix api_implementation 

45if _message is None: 

46 from google.protobuf.pyext import _message 

47 

48 

49class GeneratedProtocolMessageType(_message.MessageMeta): 

50 

51 """Metaclass for protocol message classes created at runtime from Descriptors. 

52 

53 The protocol compiler currently uses this metaclass to create protocol 

54 message classes at runtime. Clients can also manually create their own 

55 classes at runtime, as in this example: 

56 

57 mydescriptor = Descriptor(.....) 

58 factory = symbol_database.Default() 

59 factory.pool.AddDescriptor(mydescriptor) 

60 MyProtoClass = factory.GetPrototype(mydescriptor) 

61 myproto_instance = MyProtoClass() 

62 myproto.foo_field = 23 

63 ... 

64 

65 The above example will not work for nested types. If you wish to include them, 

66 use reflection.MakeClass() instead of manually instantiating the class in 

67 order to create the appropriate class structure. 

68 """ 

69 

70 # Must be consistent with the protocol-compiler code in 

71 # proto2/compiler/internal/generator.*. 

72 _DESCRIPTOR_KEY = 'DESCRIPTOR'