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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 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
...
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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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| | � t | | � t | | � t | | � t | � t | | � t | | � t t | � } | j | | | � d S( s� Here we perform the majority of our work on the class.
We add enum getters, an __init__ method, implementations
of all Message methods, and properties for all fields
in the protocol type.
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
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type.
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clients can use to get and (in some cases) set the value
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Args:
proto_field_name: The protocol message field name, exactly
as it appears (or would appear) in a .proto file.
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dictionary: Class dictionary to which we'll add a '__slots__' entry.
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Wd S( s Sets class-level attributes for all enum fields defined in this message.
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Args:
descriptor: Descriptor object for this message type.
cls: Class we're constructing for this message type.
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value may refer back to |message| via a weak reference.
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rP t d | j | f � � qT Xn | S( s Convert a string or integer enum value to an integer.
If the value is a string, it is converted to the enum value in
enum_type with the same name. If the value is not a string, it's
returned as-is. (No conversion or bounds-checking is done.)
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r; t d | j | f � � n Xd S( s� Returns a field descriptor by field name.
Args:
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field_name: The name of the field to retrieve.
Returns:
The field descriptor associated with the field name.
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cls: The class we're constructing.
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necessary "has" bits as a side-effect.
Args:
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type-checking.
Args:
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cls: The class we're constructing.
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assign to the property directly.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
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c C s= t | t j � r | | _ n t j | � | _ t | _ d S( s� Args:
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field: The descriptor of the field being set in the parent message.
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name: Extension full name.
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number: Extension field number.
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