Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.11/site-packages/google/protobuf/pyext/cpp_message.py: 78%

1# Protocol Buffers - Google's data interchange format 

2# Copyright 2008 Google Inc. All rights reserved. 

3# 

4# Use of this source code is governed by a BSD-style 

5# license that can be found in the LICENSE file or at 

6# https://developers.google.com/open-source/licenses/bsd 

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

8 

9Contains helper functions used to create protocol message classes from 

10Descriptor objects at runtime backed by the protocol buffer C++ API. 

11""" 

12 

13__author__ = 'tibell@google.com (Johan Tibell)' 

14 

15from google.protobuf.internal import api_implementation 

16 

17# pylint: disable=protected-access 

18_message = api_implementation._c_module 

19# TODO: Remove this import after fix api_implementation 

20if _message is None: 

21 from google.protobuf.pyext import _message 

22 

23 

24class GeneratedProtocolMessageType(_message.MessageMeta): 

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

26 

27 The protocol compiler currently uses this metaclass to create protocol 

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

29 classes at runtime, as in this example: 

30 

31 mydescriptor = Descriptor(.....) 

32 factory = symbol_database.Default() 

33 factory.pool.AddDescriptor(mydescriptor) 

34 MyProtoClass = message_factory.GetMessageClass(mydescriptor) 

35 myproto_instance = MyProtoClass() 

36 myproto.foo_field = 23 

37 ... 

38 

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

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

41 order to create the appropriate class structure. 

42 """ 

43 

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

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

46 _DESCRIPTOR_KEY = 'DESCRIPTOR'