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reflection.cpython-36.pyc
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3 S�Lj� � @ sd d Z dZddlmZ ddlmZ ej� dkr:ddlmZ n ddlm Z e j Z i Z 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)� )�api_implementation)�messageZcpp)� cpp_message)�python_messagec C s t | �}|� }|j|� |S )z�Generate 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. )� MakeClassZParseFromString)� descriptorZbyte_strZ result_classZnew_msg� r � /usr/lib/python3.6/reflection.py� ParseMessageC s r c C sd | t krt | S i }x"| jj� D ]\}}t|�||< q W | |tj< tt| j�tj f|�}|t | < |S )a� Construct a class object for a protobuf described by descriptor. Composite descriptors are handled by defining the new class as a member of the parent class, recursing as deep as necessary. This is the dynamic equivalent to: class Parent(message.Message): __metaclass__ = GeneratedProtocolMessageType DESCRIPTOR = descriptor class Child(message.Message): __metaclass__ = GeneratedProtocolMessageType DESCRIPTOR = descriptor.nested_types[0] Sample usage: file_descriptor = descriptor_pb2.FileDescriptorProto() file_descriptor.ParseFromString(proto2_string) msg_descriptor = descriptor.MakeDescriptor(file_descriptor.message_type[0]) msg_class = reflection.MakeClass(msg_descriptor) msg = msg_class() Args: descriptor: A descriptor.Descriptor object describing the protobuf. Returns: The Message class object described by the descriptor. ) �MESSAGE_CLASS_CACHEZnested_types_by_name�itemsr � GeneratedProtocolMessageTypeZ_DESCRIPTOR_KEY�str�namer ZMessage)r Z attributesr Z nested_type�resultr r r r S s r N)�__doc__� __author__Zgoogle.protobuf.internalr Zgoogle.protobufr ZTypeZgoogle.protobuf.pyextr Z message_implr r r r r r r r r �<module>. s