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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) | |