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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
type_checkers( t well_known_types( t wire_format( t
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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| | � 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
a Descriptor object describing this protocol message
type.
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N s c C s | S( s Returns the name of the public property attribute which
clients can use to get and (in some cases) set the value
of a protocol message field.
Args:
proto_field_name: The protocol message field name, exactly
as it appears (or would appear) in a .proto file.
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message_descriptor: A Descriptor instance describing this message type.
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.
Also exporting a class-level object that can name enum values.
Args:
descriptor: Descriptor object for this message type.
cls: Class we're constructing for this message type.
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Args:
field: FieldDescriptor object for this field.
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message: Message instance containing this field, or a weakref proxy
of same.
That function in turn returns a default value for this field. The default
value may refer back to |message| via a weak reference.
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c C s� t j � d } t | j � d k rY t | � t k rY t d t | � | | f � } n t j t | � | t j � d � d S( sC Re-raise the currently-handled TypeError with the field name added.i s %s for field %s.%si N( t syst exc_infot lent argsRF t TypeErrort strt sixt reraise( t message_namet
field_namet exc( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyt _ReraiseTypeErrorWithFieldName� s '"c s: d � � � � f d � } d | _ d | _ | | _ d S( s Adds an __init__ method to cls.c S sX t | t j � rT y | j | j SWqT t k
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:
message_descriptor: A Descriptor describing all fields in message.
field_name: The name of the field to retrieve.
Returns:
The field descriptor associated with the field name.
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| | � n
t | | � d S( s# Adds a public property for a protocol message field.
Clients can use this property to get and (in the case
of non-repeated scalar fields) directly set the value
of a protocol message field.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
t
_FIELD_NUMBERN( R t upperR� RW RH R5 Rk t _AddPropertiesForRepeatedFieldRP RQ t* _AddPropertiesForNonRepeatedCompositeFieldt' _AddPropertiesForNonRepeatedScalarField( R. R t
constant_name( ( sK /usr/lib/python2.7/site-packages/google/protobuf/internal/python_message.pyR� 2 s c sv � j � t � � } � f d � } d | _ d � | _ � f d � } d � } t | | t | | d | �� d S( s Adds a public property for a "repeated" protocol message field. Clients
can use this property to get the value of the field, which will be either a
_RepeatedScalarFieldContainer or _RepeatedCompositeFieldContainer (see
below).
Note that when clients add values to these containers, we perform
type-checking in the case of repeated scalar fields, and we also set any
necessary "has" bits as a side-effect.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
c sI | j j � � } | d k rE � j | � } | j j � | � } n | S( N( R= t getR! R_ t
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s� Adds a public property for a nonrepeated, scalar protocol message field.
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all necessary "has" bits are set as a side-effect, and we also perform
type-checking.
Args:
field: A FieldDescriptor for this field.
cls: The class we're constructing.
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c sv � j � t � � } � f d � } d | _ d � | _ � f d � } d � } t | | t | | d | �� d S( sN Adds a public property for a nonrepeated, composite protocol message field.
A composite field is a "group" or "message" field.
Clients can use this property to get the value of the field, but cannot
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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