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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.
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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