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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# [email protected] (Will Robinson)i����( t BytesION( t api_implementation( t
containers( t decoder( t encoder( t enum_type_wrapper( t message_listener( t
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descriptor( t message( t text_formats google.protobuf.Anyt GeneratedProtocolMessageTypec B s& e Z d Z d Z d � Z d � Z RS( sQ Metaclass for protocol message classes created at runtime from Descriptors.
We add implementations for all methods described in the Message class. We
also create properties to allow getting/setting all fields in the protocol
message. Finally, we create slots to prevent users from accidentally
"setting" nonexistent fields in the protocol message, which then wouldn't get
serialized / deserialized properly.
The protocol compiler currently uses this metaclass to create protocol
message classes at runtime. Clients can also manually create their own
classes at runtime, as in this example:
mydescriptor = Descriptor(.....)
factory = symbol_database.Default()
factory.pool.AddDescriptor(mydescriptor)
MyProtoClass = factory.GetPrototype(mydescriptor)
myproto_instance = MyProtoClass()
myproto.foo_field = 23
...
t
DESCRIPTORc C s~ | t j } | j t j k r9 | t j | j f 7} n t | | � t | | � t t | � } | j | | | | � } | S( s Custom allocation for runtime-generated class types.
We override __new__ because this is apparently the only place
where we can meaningfully set __slots__ on the class we're creating(?).
(The interplay between metaclasses and slots is not very well-documented).
Args:
name: Name of the class (ignored, but required by the
metaclass protocol).
bases: Base classes of the class we're constructing.
(Should be message.Message). We ignore this field, but
it's required by the metaclass protocol
dictionary: The class dictionary of the class we're
constructing. dictionary[_DESCRIPTOR_KEY] must contain
a Descriptor object describing this protocol message
type.
Returns:
Newly-allocated class.
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field: A FieldDescriptor for this field.
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field_number: Field number of this value. (Since the field number
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field_type: The type of the field. One of the TYPE_* constants
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r4 t d | � � n X| j j | d � } | d k ro | j | j � ro | j Sd Sd S( sD Returns the name of the currently set field inside a oneof, or None.s) Protocol message has no oneof "%s" field.N( R� R6 R� RC R� R! Ro R ( R� t
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In order to support semantics like:
foo.bar.baz.qux = 23
assert foo.HasField('bar')
...child objects must have back references to their parents.
This helper class is at the heart of this support.
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field: The descriptor of the field being set in the parent message.
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sK Cannot assign to extension "%s" because it is a repeated or composite type.N( R: R RH R5 Rk RP RQ R� R R R� R� R= R� ( R� R9 RN R� ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt __setitem__� s c C s | j j j | d � S( s� Tries to find a known extension with the specified name.
Args:
name: Extension full name.
Returns:
Extension field descriptor.
N( R R� R� R! ( R� R ( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _FindExtensionByName s c C s | j j j | d � S( s� Tries to find a known extension with the field number.
Args:
number: Extension field number.
Returns:
Extension field descriptor.
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