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// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Implementations of I/O traits for the Option type
//!
//! I/O constructors return option types to allow errors to be handled.
//! These implementations allow e.g. `Option<FileStream>` to be used
//! as a `Reader` without unwrapping the option first.
//!
//! # XXX Seek and Close
use option::*;
use super::{Reader, Writer, Listener, Acceptor};
use super::{standard_error, PreviousIoError, io_error, read_error, IoError};
fn prev_io_error() -> IoError {
standard_error(PreviousIoError)
}
impl<W: Writer> Writer for Option<W> {
fn write(&mut self, buf: &[u8]) {
match *self {
Some(ref mut writer) => writer.write(buf),
None => io_error::cond.raise(prev_io_error())
}
}
fn flush(&mut self) {
match *self {
Some(ref mut writer) => writer.flush(),
None => io_error::cond.raise(prev_io_error())
}
}
}
impl<R: Reader> Reader for Option<R> {
fn read(&mut self, buf: &mut [u8]) -> Option<uint> {
match *self {
Some(ref mut reader) => reader.read(buf),
None => {
read_error::cond.raise(prev_io_error());
None
}
}
}
fn eof(&mut self) -> bool {
match *self {
Some(ref mut reader) => reader.eof(),
None => {
io_error::cond.raise(prev_io_error());
true
}
}
}
}
impl<T, A: Acceptor<T>, L: Listener<T, A>> Listener<T, A> for Option<L> {
fn listen(self) -> Option<A> {
match self {
Some(listener) => listener.listen(),
None => {
io_error::cond.raise(prev_io_error());
None
}
}
}
}
impl<T, A: Acceptor<T>> Acceptor<T> for Option<A> {
fn accept(&mut self) -> Option<T> {
match *self {
Some(ref mut acceptor) => acceptor.accept(),
None => {
io_error::cond.raise(prev_io_error());
None
}
}
}
}
#[cfg(test)]
mod test {
use option::*;
use super::super::mem::*;
use rt::test::*;
use super::super::{PreviousIoError, io_error, read_error};
#[test]
fn test_option_writer() {
do run_in_mt_newsched_task {
let mut writer: Option<MemWriter> = Some(MemWriter::new());
writer.write([0, 1, 2]);
writer.flush();
assert_eq!(writer.unwrap().inner(), ~[0, 1, 2]);
}
}
#[test]
fn test_option_writer_error() {
do run_in_mt_newsched_task {
let mut writer: Option<MemWriter> = None;
let mut called = false;
do io_error::cond.trap(|err| {
assert_eq!(err.kind, PreviousIoError);
called = true;
}).inside {
writer.write([0, 0, 0]);
}
assert!(called);
let mut called = false;
do io_error::cond.trap(|err| {
assert_eq!(err.kind, PreviousIoError);
called = true;
}).inside {
writer.flush();
}
assert!(called);
}
}
#[test]
fn test_option_reader() {
do run_in_mt_newsched_task {
let mut reader: Option<MemReader> = Some(MemReader::new(~[0, 1, 2, 3]));
let mut buf = [0, 0];
reader.read(buf);
assert_eq!(buf, [0, 1]);
assert!(!reader.eof());
}
}
#[test]
fn test_option_reader_error() {
let mut reader: Option<MemReader> = None;
let mut buf = [];
let mut called = false;
do read_error::cond.trap(|err| {
assert_eq!(err.kind, PreviousIoError);
called = true;
}).inside {
reader.read(buf);
}
assert!(called);
let mut called = false;
do io_error::cond.trap(|err| {
assert_eq!(err.kind, PreviousIoError);
called = true;
}).inside {
assert!(reader.eof());
}
assert!(called);
}
}
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