blob: 92c218fe46a0eec7eb4c43fcf9835ce106b975e8 [file] [log] [blame]
use core::marker::PhantomData;
use {Sink, Poll, StartSend};
/// A sink combinator to change the error type of a sink.
///
/// This is created by the `Sink::from_err` method.
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct SinkFromErr<S, E> {
sink: S,
f: PhantomData<E>
}
pub fn new<S, E>(sink: S) -> SinkFromErr<S, E>
where S: Sink
{
SinkFromErr {
sink: sink,
f: PhantomData
}
}
impl<S, E> SinkFromErr<S, E> {
/// Get a shared reference to the inner sink.
pub fn get_ref(&self) -> &S {
&self.sink
}
/// Get a mutable reference to the inner sink.
pub fn get_mut(&mut self) -> &mut S {
&mut self.sink
}
/// Consumes this combinator, returning the underlying sink.
///
/// Note that this may discard intermediate state of this combinator, so
/// care should be taken to avoid losing resources when this is called.
pub fn into_inner(self) -> S {
self.sink
}
}
impl<S, E> Sink for SinkFromErr<S, E>
where S: Sink,
E: From<S::SinkError>
{
type SinkItem = S::SinkItem;
type SinkError = E;
fn start_send(&mut self, item: Self::SinkItem) -> StartSend<Self::SinkItem, Self::SinkError> {
self.sink.start_send(item).map_err(|e| e.into())
}
fn poll_complete(&mut self) -> Poll<(), Self::SinkError> {
self.sink.poll_complete().map_err(|e| e.into())
}
fn close(&mut self) -> Poll<(), Self::SinkError> {
self.sink.close().map_err(|e| e.into())
}
}
impl<S: ::stream::Stream, E> ::stream::Stream for SinkFromErr<S, E> {
type Item = S::Item;
type Error = S::Error;
fn poll(&mut self) -> Poll<Option<S::Item>, S::Error> {
self.sink.poll()
}
}