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use container_traits::MapContainer;
use fd;
use std::io;
use subfield::{subfield_length, write_subfield_length};
use Argdata;
use ArgdataRef;
use ReadError;
use Value;
#[derive(Clone, Copy, Debug)]
pub struct Map<'d, T: 'd> {
items: &'d T,
length: usize,
}
pub fn map<'d, T>(items: &'d T) -> Map<'d, T>
where
T: MapContainer,
<T as MapContainer>::Key: Argdata<'d>,
<T as MapContainer>::Value: Argdata<'d>,
{
let mut length = 1;
for i in 0..items.len() {
let (k, v) = items.get(i).unwrap();
length += subfield_length(k.serialized_length());
length += subfield_length(v.serialized_length());
}
Map { items, length }
}
impl<'d, T> Map<'d, T>
where
T: MapContainer,
<T as MapContainer>::Key: Argdata<'d>,
<T as MapContainer>::Value: Argdata<'d>,
{
pub fn elements(&self) -> &'d T {
self.items
}
}
impl<'d, T> Argdata<'d> for Map<'d, T>
where
T: MapContainer,
<T as MapContainer>::Key: Argdata<'d>,
<T as MapContainer>::Value: Argdata<'d>,
{
fn read<'a>(&'a self) -> Result<Value<'a, 'd>, ReadError>
where
'd: 'a,
{
Ok(Value::Map(self))
}
fn serialized_length(&self) -> usize {
self.length
}
fn serialize(
&self,
writer: &mut io::Write,
mut fd_map: Option<&mut fd::FdMapping>,
) -> io::Result<()> {
writer.write_all(&[6])?;
for i in 0..self.items.len() {
let (k, v) = self.items.get(i).unwrap();
write_subfield_length(k.serialized_length(), writer)?;
k.serialize(writer, fd_map.as_mut().map(|x| *x as _))?;
write_subfield_length(v.serialized_length(), writer)?;
v.serialize(writer, fd_map.as_mut().map(|x| *x as _))?;
}
Ok(())
}
}
impl<'d, T> ::Map<'d> for Map<'d, T>
where
T: MapContainer,
<T as MapContainer>::Key: Argdata<'d>,
<T as MapContainer>::Value: Argdata<'d>,
{
fn iter_map_next<'a>(
&'a self,
cookie: &mut usize,
) -> Option<Result<(ArgdataRef<'a, 'd>, ArgdataRef<'a, 'd>), ReadError>>
where
'd: 'a,
{
self.items.get(*cookie).map(|(k, v)| {
*cookie += 1;
Ok((ArgdataRef::reference(k), ArgdataRef::reference(v)))
})
}
}