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reflection.pyc
� ���hc @ s� d Z d Z d d l m Z d d l m Z e j � d k rQ d d l m Z n d d l m Z e j Z i Z d � Z d � Z d S( s 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*. s# robinson@google.com (Will Robinson)i����( t api_implementation( t messaget cpp( t cpp_message( t python_messagec C s& t | � } | � } | j | � | S( s� 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. ( t MakeClasst ParseFromString( t descriptort byte_strt result_classt new_msg( ( s> /usr/lib/python2.7/site-packages/google/protobuf/reflection.pyt ParseMessageC s c C s� | t k r t | Si } x- | j j � D] \ } } t | � | | <q* W| | t j <t t | j � t j f | � } | t | <| S( s� 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. ( t MESSAGE_CLASS_CACHEt nested_types_by_namet itemsR t GeneratedProtocolMessageTypet _DESCRIPTOR_KEYt strt nameR t Message( R t attributesR t nested_typet result( ( s> /usr/lib/python2.7/site-packages/google/protobuf/reflection.pyR S s N( t __doc__t __author__t google.protobuf.internalR t google.protobufR t Typet google.protobuf.pyextR t message_implR R R R R ( ( ( s> /usr/lib/python2.7/site-packages/google/protobuf/reflection.pyt <module>. s
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