code: def _GetPrimitiveEncoder(self):
      
      # Decide what should the primitive type be for packing the target rdfvalue
      # into the protobuf and create a delegate descriptor to control that.
      primitive_cls = self._PROTO_DATA_STORE_LOOKUP[self.type.data_store_type]
      self.primitive_desc = primitive_cls(**self._kwargs)
  
      # Our wiretype is the same as the delegate's.
      self.wire_type = self.primitive_desc.wire_type
      self.proto_type_name = self.primitive_desc.proto_type_name
  
      # Recalculate our tags.
      self.CalculateTags()
docs: Finds the primitive encoder according to the type's data_store_type.