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//! Utilities to support "extension" fields.
//!
//! Extensions are [described in the official protobuf documentation][exts].
//!
//! [exts]: https://developers.google.com/protocol-buffers/docs/proto#extensions
use std::marker::PhantomData;
use core::Message;
use types::ProtobufType;
/// Optional ext field
pub struct ExtFieldOptional<M: Message, T: ProtobufType> {
/// Extension field number
pub field_number: u32,
/// Marker
// TODO: hide
pub phantom: PhantomData<(M, T)>,
}
/// Repeated ext field
pub struct ExtFieldRepeated<M: Message, T: ProtobufType> {
/// Extension field number
pub field_number: u32,
/// Extension field number
// TODO: hide
pub phantom: PhantomData<(M, T)>,
}
impl<M: Message, T: ProtobufType> ExtFieldOptional<M, T> {
/// Get a copy of value from a message.
///
/// Extension data is stored in [`UnknownFields`](crate::UnknownFields).
pub fn get(&self, m: &M) -> Option<T::Value> {
m.get_unknown_fields()
.get(self.field_number)
.and_then(T::get_from_unknown)
}
}
impl<M: Message, T: ProtobufType> ExtFieldRepeated<M, T> {
/// Get a copy of value from a message (**not implemented**).
pub fn get(&self, _m: &M) -> Vec<T::Value> {
// TODO
unimplemented!()
}
}
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