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//! Utilities to support "extension" fields.
//!
//! This is a stopgap implementation, it only allows to fetch basic singular values,
//! and that's it. Anything similar to extension registry is not implemented yet.
//!
//! Extensions are [described in the official protobuf documentation][exts].
//!
//! [exts]: https://developers.google.com/protocol-buffers/docs/proto#extensions
use std::marker::PhantomData;
use crate::descriptor::field_descriptor_proto::Type;
use crate::reflect::runtime_types::RuntimeTypeTrait;
use crate::reflect::ProtobufValue;
use crate::Message;
/// Optional ext field
///
/// This is initialized from generated code, do not instantiate directly.
pub struct ExtFieldOptional<M, T> {
/// Extension field number.
field_number: u32,
/// Extension field type.
field_type: Type,
/// Marker
phantom: PhantomData<(M, T)>,
}
/// Repeated ext field
///
/// This is initialized from generated code, do not instantiate directly.
pub struct ExtFieldRepeated<M, V> {
/// Extension field number
#[allow(dead_code)]
field_number: u32,
/// Field type.
#[allow(dead_code)]
field_type: Type,
/// Extension field number
phantom: PhantomData<(M, V)>,
}
impl<M, V> ExtFieldOptional<M, V> {
/// Constructor. Called from generated code.
pub const fn new(field_number: u32, field_type: Type) -> Self {
ExtFieldOptional {
field_number,
field_type,
phantom: PhantomData,
}
}
}
impl<M: Message, V: ProtobufValue> ExtFieldOptional<M, V> {
/// Get a copy of value from a message.
///
/// Extension data is stored in [`UnknownFields`](crate::UnknownFields).
pub fn get(&self, m: &M) -> Option<V> {
m.unknown_fields()
.get(self.field_number)
.and_then(|u| V::RuntimeType::get_from_unknown(u, self.field_type))
}
}
impl<M, V> ExtFieldRepeated<M, V> {
/// Constructor. Called from generated code.
pub const fn new(field_number: u32, field_type: Type) -> Self {
ExtFieldRepeated {
field_number,
field_type,
phantom: PhantomData,
}
}
}
impl<M: Message, V: ProtobufValue> ExtFieldRepeated<M, V> {
/// Get a copy of value from a message (**not implemented**).
pub fn get(&self, _m: &M) -> Vec<V> {
unimplemented!("extension fields implementation in rust-protobuf is stopgap")
}
}