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# Protocol Buffers - Google's data interchange format
# Copyright 2008 Google Inc. All rights reserved.
#
# Use of this source code is governed by a BSD-style
# license that can be found in the LICENSE file or at
# https://developers.google.com/open-source/licenses/bsd
# This code is meant to work on Python 2.4 and above only.
"""Contains a metaclass and helper functions used to create
protocol message classes from Descriptor objects at runtime.
Recall that a metaclass is the "type" of a class.
(A class is to a metaclass what an instance is to a class.)
In this case, we use the GeneratedProtocolMessageType metaclass
to inject all the useful functionality into the classes
output by the protocol compiler at compile-time.
The upshot of all this is that the real implementation
details for ALL pure-Python protocol buffers are *here in
this file*.
"""
__author__ = '[email protected] (Will Robinson)'
from google.protobuf import message_factory
from google.protobuf import symbol_database
# The type of all Message classes.
# Part of the public interface, but normally only used by message factories.
GeneratedProtocolMessageType = message_factory._GENERATED_PROTOCOL_MESSAGE_TYPE
MESSAGE_CLASS_CACHE = {}
# Deprecated. Please NEVER use reflection.ParseMessage().
def ParseMessage(descriptor, byte_str):
"""Generate a new Message instance from this Descriptor and a byte string.
DEPRECATED: ParseMessage is deprecated because it is using MakeClass().
Please use MessageFactory.GetPrototype() instead.
Args:
descriptor: Protobuf Descriptor object
byte_str: Serialized protocol buffer byte string
Returns:
Newly created protobuf Message object.
"""
result_class = MakeClass(descriptor)
new_msg = result_class()
new_msg.ParseFromString(byte_str)
return new_msg
# Deprecated. Please NEVER use reflection.MakeClass().
def MakeClass(descriptor):
"""Construct a class object for a protobuf described by descriptor.
DEPRECATED: use MessageFactory.GetPrototype() instead.
Args:
descriptor: A descriptor.Descriptor object describing the protobuf.
Returns:
The Message class object described by the descriptor.
"""
# Original implementation leads to duplicate message classes, which won't play
# well with extensions. Message factory info is also missing.
# Redirect to message_factory.
return message_factory.GetMessageClass(descriptor)
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