50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
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# Protocol Buffers - Google's data interchange format
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# Copyright 2008 Google Inc. All rights reserved.
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#
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# Use of this source code is governed by a BSD-style
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# license that can be found in the LICENSE file or at
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# https://developers.google.com/open-source/licenses/bsd
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"""Protocol message implementation hooks for C++ implementation.
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Contains helper functions used to create protocol message classes from
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Descriptor objects at runtime backed by the protocol buffer C++ API.
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"""
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__author__ = 'tibell@google.com (Johan Tibell)'
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from google.protobuf.internal import api_implementation
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# pylint: disable=protected-access
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_message = api_implementation._c_module
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# TODO: Remove this import after fix api_implementation
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if _message is None:
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from google.protobuf.pyext import _message
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class GeneratedProtocolMessageType(_message.MessageMeta):
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"""Metaclass for protocol message classes created at runtime from Descriptors.
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The protocol compiler currently uses this metaclass to create protocol
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message classes at runtime. Clients can also manually create their own
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classes at runtime, as in this example:
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mydescriptor = Descriptor(.....)
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factory = symbol_database.Default()
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factory.pool.AddDescriptor(mydescriptor)
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MyProtoClass = factory.GetPrototype(mydescriptor)
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myproto_instance = MyProtoClass()
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myproto.foo_field = 23
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...
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The above example will not work for nested types. If you wish to include them,
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use reflection.MakeClass() instead of manually instantiating the class in
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order to create the appropriate class structure.
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"""
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# Must be consistent with the protocol-compiler code in
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# proto2/compiler/internal/generator.*.
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_DESCRIPTOR_KEY = 'DESCRIPTOR'
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