RProtoBuf (version 0.4.22)

has-methods: Indicates if an object has the given field set

Description

This generic method, currently implemented for Message and EnumDescriptor indicates if the message or enum descriptor has the given field set.

For messages and non-repeated fields, a call to the HasField method of the corresponding Message is issued.

For messages and repeated fields, a call to the FieldSize method is issued, and the message is declared to have the field if the size is greater than 0.

NULL is returned if the descriptor for the message does not contain the given field at all.

For EnumDescriptors, a boolean value indicates if the given name is present in the enum definition.

Methods

has

signature(object = "Message"): Indicates if the message has a given field.

has

signature(object = "EnumDescriptor"): Indicates if the EnumDescriptor has a given named element.

Examples

unitest.proto.file <- system.file("tinytest", "data", "unittest.proto",
				  package = "RProtoBuf" )
readProtoFiles(file = unitest.proto.file)

test <- new(protobuf_unittest.TestAllTypes)
test$has("optional_int32")
# FALSE
test$add("repeated_int32", 1:10)
test$has("repeated_int32")
# TRUE
test$has("nonexistant")
# NULL

has(protobuf_unittest.TestAllTypes$NestedEnum, "FOO")
has(protobuf_unittest.TestAllTypes$NestedEnum, "BAR")
has(protobuf_unittest.TestAllTypes$NestedEnum, "XXX")