Struct protobuf::reflect::FieldDescriptor

pub struct FieldDescriptor { /* private fields */ }

Field descriptor.

Can be used for runtime reflection.

Implementations

impl FieldDescriptor

pub fn proto(&self) -> &'static FieldDescriptorProto

Get .proto description of field

pub fn name(&self) -> &'static str

Field name as specified in .proto file

pub fn json_name(&self) -> &str

JSON field name.

Can be different from .proto field name.

See JSON mapping for details.

pub fn is_repeated(&self) -> bool

If this field repeated?

pub fn has_field(&self, m: &dyn Message) -> bool

Check if field is set in given message.

For repeated field or map field return true if collection is not empty.

Panics

If this field belongs to a different message type.

pub fn len_field(&self, m: &dyn Message) -> usize

Return length of repeated field.

For singular field return 1 if field is set and 0 otherwise.

Panics

If this field belongs to a different message type.

pub fn get_message<'a>(&self, m: &'a dyn Message) -> &'a dyn Message

Get message field or default instance if field is unset.

Panics

If this field belongs to a different message type or field type is not message.

pub fn get_enum(&self, m: &dyn Message) -> &'static EnumValueDescriptor

Get enum field.

Panics

If this field belongs to a different message type or field type is not singular enum.

pub fn get_str<'a>(&self, m: &'a dyn Message) -> &'a str

Get string field.

Panics

If this field belongs to a different message type or field type is not singular string.

pub fn get_bytes<'a>(&self, m: &'a dyn Message) -> &'a [u8]

Get bytes field.

Panics

If this field belongs to a different message type or field type is not singular bytes.

pub fn get_u32(&self, m: &dyn Message) -> u32

Get u32 field.

Panics

If this field belongs to a different message type or field type is not singular u32.

pub fn get_u64(&self, m: &dyn Message) -> u64

Get u64 field.

Panics

If this field belongs to a different message type or field type is not singular u64.

pub fn get_i32(&self, m: &dyn Message) -> i32

Get i32 field.

Panics

If this field belongs to a different message type or field type is not singular i32.

pub fn get_i64(&self, m: &dyn Message) -> i64

Get i64 field.

Panics

If this field belongs to a different message type or field type is not singular i64.

pub fn get_bool(&self, m: &dyn Message) -> bool

Get bool field.

Panics

If this field belongs to a different message type or field type is not singular bool.

pub fn get_f32(&self, m: &dyn Message) -> f32

Get float field.

Panics

If this field belongs to a different message type or field type is not singular float.

pub fn get_f64(&self, m: &dyn Message) -> f64

Get double field.

Panics

If this field belongs to a different message type or field type is not singular double.

pub fn get_reflect<'a>(&self, m: &'a dyn Message) -> ReflectFieldRef<'a>

Get field of any type.

Panics

If this field belongs to a different message type.