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use {Poll, Async};
use stream::Stream;
#[derive(Debug)]
#[must_use = "streams do nothing unless polled"]
pub struct Fuse<S> {
stream: S,
done: bool,
}
impl<S> ::sink::Sink for Fuse<S>
where S: ::sink::Sink
{
type SinkItem = S::SinkItem;
type SinkError = S::SinkError;
fn start_send(&mut self, item: S::SinkItem) -> ::StartSend<S::SinkItem, S::SinkError> {
self.stream.start_send(item)
}
fn poll_complete(&mut self) -> Poll<(), S::SinkError> {
self.stream.poll_complete()
}
fn close(&mut self) -> Poll<(), S::SinkError> {
self.stream.close()
}
}
pub fn new<S: Stream>(s: S) -> Fuse<S> {
Fuse { stream: s, done: false }
}
impl<S: Stream> Stream for Fuse<S> {
type Item = S::Item;
type Error = S::Error;
fn poll(&mut self) -> Poll<Option<S::Item>, S::Error> {
if self.done {
Ok(Async::Ready(None))
} else {
let r = self.stream.poll();
if let Ok(Async::Ready(None)) = r {
self.done = true;
}
r
}
}
}
impl<S> Fuse<S> {
pub fn is_done(&self) -> bool {
self.done
}
pub fn get_ref(&self) -> &S {
&self.stream
}
pub fn get_mut(&mut self) -> &mut S {
&mut self.stream
}
pub fn into_inner(self) -> S {
self.stream
}
}