| # 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__ = 'robinson@google.com (Will Robinson)' | |
| import warnings | |
| 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 = {} | |