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use ffi;
use glib::translate::*;
use Stream;
use StreamCollection;
pub struct Iter<'a> {
collection: &'a StreamCollection,
idx: u32,
size: u32,
}
impl<'a> Iter<'a> {
fn new(collection: &'a StreamCollection) -> Iter<'a> {
skip_assert_initialized!();
Iter {
collection,
idx: 0,
size: collection.len() as u32,
}
}
}
impl<'a> Iterator for Iter<'a> {
type Item = Stream;
fn next(&mut self) -> Option<Self::Item> {
if self.idx >= self.size {
return None;
}
let item = self.collection.get_stream(self.idx);
self.idx += 1;
item
}
fn size_hint(&self) -> (usize, Option<usize>) {
if self.idx == self.size {
return (0, Some(0));
}
let remaining = (self.size - self.idx) as usize;
(remaining, Some(remaining))
}
}
impl<'a> DoubleEndedIterator for Iter<'a> {
fn next_back(&mut self) -> Option<Self::Item> {
if self.idx == self.size {
return None;
}
self.size -= 1;
self.collection.get_stream(self.size)
}
}
impl<'a> ExactSizeIterator for Iter<'a> {}
impl StreamCollection {
pub fn new<'a, P: Into<Option<&'a str>>>(upstream_id: P) -> StreamCollection {
assert_initialized_main_thread!();
let upstream_id = upstream_id.into();
let upstream_id = upstream_id.to_glib_none();
let (major, minor, _, _) = ::version();
if (major, minor) > (1, 12) {
unsafe { from_glib_full(ffi::gst_stream_collection_new(upstream_id.0)) }
} else {
unsafe { from_glib_none(ffi::gst_stream_collection_new(upstream_id.0)) }
}
}
pub fn iter(&self) -> Iter {
Iter::new(self)
}
pub fn len(&self) -> usize {
self.get_size() as usize
}
pub fn is_empty(&self) -> bool {
self.len() == 0
}
}