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use super::ReadGuard;
use crate::{inner::Inner, values::Values};
use std::borrow::Borrow;
use std::hash::{BuildHasher, Hash};
use std::mem::ManuallyDrop;
#[derive(Debug)]
pub struct MapReadRef<'rh, K, V, M, S>
where
K: Hash + Eq,
S: BuildHasher,
{
pub(super) guard: Option<ReadGuard<'rh, Inner<K, ManuallyDrop<V>, M, S>>>,
}
impl<'rh, K, V, M, S> MapReadRef<'rh, K, V, M, S>
where
K: Hash + Eq,
S: BuildHasher,
{
pub fn iter(&self) -> ReadGuardIter<'_, K, V, S> {
ReadGuardIter {
iter: self.guard.as_ref().map(|rg| rg.data.iter()),
}
}
pub fn len(&self) -> usize {
self.guard
.as_ref()
.map(|inner| inner.data.len())
.unwrap_or(0)
}
pub fn is_empty(&self) -> bool {
self.guard
.as_ref()
.map(|inner| inner.data.is_empty())
.unwrap_or(true)
}
pub fn meta(&self) -> Option<&M> {
self.guard.as_ref().map(|inner| &inner.meta)
}
pub fn get<'a, Q: ?Sized>(&'a self, key: &'_ Q) -> Option<&'a Values<V, S>>
where
K: Borrow<Q>,
Q: Hash + Eq,
{
let inner = self.guard.as_ref()?;
if !inner.is_ready() {
return None;
}
inner.data.get(key).map(Values::user_friendly)
}
pub fn is_destroyed(&self) -> bool {
self.guard.is_none()
}
pub fn contains_key<Q: ?Sized>(&self, key: &Q) -> bool
where
K: Borrow<Q>,
Q: Hash + Eq,
{
let inner = self.guard.as_ref();
match inner {
None => false,
Some(ref inner) if !inner.is_ready() => false,
Some(ref inner) => inner.data.contains_key(key),
}
}
}
impl<'rh, K, Q, V, M, S> std::ops::Index<&'_ Q> for MapReadRef<'rh, K, V, M, S>
where
K: Eq + Hash + Borrow<Q>,
Q: Eq + Hash + ?Sized,
S: BuildHasher,
{
type Output = Values<V, S>;
fn index(&self, key: &Q) -> &Self::Output {
self.get(key).unwrap()
}
}
impl<'rg, 'rh, K, V, M, S> IntoIterator for &'rg MapReadRef<'rh, K, V, M, S>
where
K: Eq + Hash,
S: BuildHasher,
{
type Item = (&'rg K, &'rg Values<V, S>);
type IntoIter = ReadGuardIter<'rg, K, V, S>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
#[derive(Debug)]
pub struct ReadGuardIter<'rg, K, V, S>
where
K: Eq + Hash,
S: BuildHasher,
{
iter: Option<
<&'rg crate::inner::MapImpl<K, Values<ManuallyDrop<V>, S>, S> as IntoIterator>::IntoIter,
>,
}
impl<'rg, K, V, S> Iterator for ReadGuardIter<'rg, K, V, S>
where
K: Eq + Hash,
S: BuildHasher,
{
type Item = (&'rg K, &'rg Values<V, S>);
fn next(&mut self) -> Option<Self::Item> {
self.iter
.as_mut()
.and_then(|iter| iter.next().map(|(k, v)| (k, v.user_friendly())))
}
}