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use std::marker::PhantomData;
use std::fmt::{self, Formatter};
use serde::de::{Deserialize, Deserializer, Visitor, MapAccess};
use serde::ser::{SerializeMap, Serializer, Serialize};
use super::{IdMap, IntegerId};
use super::table::EntryTable;
struct IdMapVisitor<K: IntegerId, V, T: EntryTable<K, V>>(PhantomData<IdMap<K, V, T>>);
impl<'de, K, V, T> Visitor<'de> for IdMapVisitor<K, V, T>
where K: IntegerId, T: EntryTable<K, V>, K: Deserialize<'de>, V: Deserialize<'de> {
type Value = IdMap<K, V, T>;
#[inline]
fn expecting(&self, f: &mut Formatter) -> fmt::Result {
f.write_str("an IdMap")
}
#[inline]
fn visit_map<M>(self, mut access: M) -> Result<Self::Value, M::Error> where M: MapAccess<'de> {
let mut result = IdMap::with_capacity_other(
access.size_hint().unwrap_or(0)
);
while let Some((key, value)) = access.next_entry()? {
result.insert(key, value);
}
Ok(result)
}
}
impl<'de, K, V, T> Deserialize<'de> for IdMap<K, V, T>
where K: Deserialize<'de>, T: EntryTable<K, V>,
K: IntegerId, V: Deserialize<'de> {
#[inline]
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
deserializer.deserialize_map(IdMapVisitor(PhantomData))
}
}
impl<K, V, T> Serialize for IdMap<K, V, T>
where K: IntegerId, K: Serialize, V: Serialize, T: EntryTable<K, V> {
#[inline]
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
let mut map = serializer.serialize_map(Some(self.len()))?;
for (k, v) in self.iter() {
map.serialize_entry(k, v)?;
}
map.end()
}
}