Struct prost_types::FieldDescriptorProto

pub struct FieldDescriptorProto {
    pub name: Option<String>,
    pub number: Option<i32>,
    pub label: Option<i32>,
    pub type: Option<i32>,
    pub type_name: Option<String>,
    pub extendee: Option<String>,
    pub default_value: Option<String>,
    pub oneof_index: Option<i32>,
    pub json_name: Option<String>,
    pub options: Option<FieldOptions>,
    pub proto3_optional: Option<bool>,
}

Describes a field within a message.

Fields

name: Option<String>

number: Option<i32>

label: Option<i32>

type: Option<i32>

If type_name is set, this need not be set. If both this and type_name are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP.

type_name: Option<String>

For message and enum types, this is the name of the type. If the name starts with a ‘.’, it is fully-qualified. Otherwise, C++-like scoping rules are used to find the type (i.e. first the nested types within this message are searched, then within the parent, on up to the root namespace).

extendee: Option<String>

For extensions, this is the name of the type being extended. It is resolved in the same manner as type_name.

default_value: Option<String>

For numeric types, contains the original text representation of the value. For booleans, “true” or “false”. For strings, contains the default text contents (not escaped in any way). For bytes, contains the C escaped value. All bytes >= 128 are escaped. TODO(kenton): Base-64 encode?

oneof_index: Option<i32>

If set, gives the index of a oneof in the containing type’s oneof_decl list. This field is a member of that oneof.

json_name: Option<String>

JSON name of this field. The value is set by protocol compiler. If the user has set a “json_name” option on this field, that option’s value will be used. Otherwise, it’s deduced from the field’s name by converting it to camelCase.

options: Option<FieldOptions>

proto3_optional: Option<bool>

If true, this is a proto3 “optional”. When a proto3 field is optional, it tracks presence regardless of field type.

When proto3_optional is true, this field must be belong to a oneof to signal to old proto3 clients that presence is tracked for this field. This oneof is known as a “synthetic” oneof, and this field must be its sole member (each proto3 optional field gets its own synthetic oneof). Synthetic oneofs exist in the descriptor only, and do not generate any API. Synthetic oneofs must be ordered after all “real” oneofs.

For message fields, proto3_optional doesn’t create any semantic change, since non-repeated message fields always track presence. However it still indicates the semantic detail of whether the user wrote “optional” or not. This can be useful for round-tripping the .proto file. For consistency we give message fields a synthetic oneof also, even though it is not required to track presence. This is especially important because the parser can’t tell if a field is a message or an enum, so it must always create a synthetic oneof.

Proto2 optional fields do not set this flag, because they already indicate optional with LABEL_OPTIONAL.

Implementations

impl FieldDescriptorProto

pub fn name(&self) -> &str

Returns the value of name, or the default value if name is unset.

pub fn extendee(&self) -> &str

Returns the value of extendee, or the default value if extendee is unset.

pub fn number(&self) -> i32

Returns the value of number, or the default value if number is unset.

pub fn label(&self) -> Label

Returns the enum value of label, or the default if the field is unset or set to an invalid enum value.

pub fn set_label(&mut self, value: Label)

Sets label to the provided enum value.

pub fn type(&self) -> Type

Returns the enum value of type, or the default if the field is unset or set to an invalid enum value.

pub fn set_type(&mut self, value: Type)

Sets type to the provided enum value.

pub fn type_name(&self) -> &str

Returns the value of type_name, or the default value if type_name is unset.

pub fn default_value(&self) -> &str

Returns the value of default_value, or the default value if default_value is unset.

pub fn oneof_index(&self) -> i32

Returns the value of oneof_index, or the default value if oneof_index is unset.

pub fn json_name(&self) -> &str

Returns the value of json_name, or the default value if json_name is unset.

pub fn proto3_optional(&self) -> bool

Returns the value of proto3_optional, or the default value if proto3_optional is unset.

Trait Implementations

impl Clone for FieldDescriptorProto

fn clone(&self) -> FieldDescriptorProto

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for FieldDescriptorProto

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for FieldDescriptorProto

fn default() -> Self

Returns the “default value” for a type.

impl Message for FieldDescriptorProto

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
    B: BufMut,
    Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8, Global>where
    Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError>where
    B: BufMut,
    Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8, Global>where
    Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode<B>(buf: B) -> Result<Self, DecodeError>where
    B: Buf,
    Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>where
    B: Buf,
    Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError>where
    B: Buf,
    Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError>where
    B: Buf,
    Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq<FieldDescriptorProto> for FieldDescriptorProto

fn eq(&self, other: &FieldDescriptorProto) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for FieldDescriptorProto