U µ£ dØã@sddZdZddlmZddlmZe ¡dkr:ddlmZ n ddlm Z e j Z iZ dd „Z d d „Zd S) a 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*. z#robinson@google.com (Will Robinson)é)Úapi_implementation)ÚmessageZcpp)Ú cpp_message)Úpython_messagecCst|ƒ}|ƒ}| |¡|S)zêGenerate a new Message instance from this Descriptor and a byte string. Args: descriptor: Protobuf Descriptor object byte_str: Serialized protocol buffer byte string Returns: Newly created protobuf Message object. )Ú MakeClassZParseFromString)Ú descriptorZbyte_strZ result_classZnew_msg©rú!s