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use crate::reference::*;
use crate::table::Table;
use crate::weak_entry::*;
pub struct TableVecSortedWeak<D, R, RW> {
v: Vec<WeakEntry<D, R, RW>>,
}
impl<D, R, RW> TableVecSortedWeak<D, R, RW>
where
D: std::hash::Hash + std::cmp::Eq + std::fmt::Debug,
R: Reference<D>,
RW: ReferenceWeak<D, R>,
{
fn linear_search<Range>(&self, range: Range, hash: u64, data: &D) -> Option<R>
where
Range: Iterator<Item = usize>,
{
for x in range {
let m = self.v[x].get_existing_near(hash, &data);
match m {
Err(()) => {
break;
}
Ok(y) => {
if let Some(p) = y {
return Some(p);
}
}
}
}
None
}
fn linear_search_up(&self, idx: usize, hash: u64, data: &D) -> Option<R> {
self.linear_search(idx..self.v.len(), hash, data)
}
fn linear_search_down(&self, idx: usize, hash: u64, data: &D) -> Option<R> {
self.linear_search((0..idx).rev(), hash, data)
}
fn linear_search_around(&self, idx: usize, hash: u64, data: &D) -> Option<R> {
self.linear_search_up(idx, hash, data)
.or_else(|| self.linear_search_down(idx, hash, data))
}
}
impl<D, R, RW> Default for TableVecSortedWeak<D, R, RW>
where
D: std::hash::Hash + std::cmp::Eq + std::fmt::Debug,
R: Reference<D>,
RW: ReferenceWeak<D, R>,
{
fn default() -> Self {
Self { v: Vec::new() }
}
}
impl<D, R, RW> Table<D, R> for TableVecSortedWeak<D, R, RW>
where
D: std::hash::Hash + std::cmp::Eq + std::fmt::Debug,
R: Reference<D>,
RW: ReferenceWeak<D, R>,
{
fn get(&self, hash: u64, data: &D) -> Option<R> {
let result = self.v.binary_search_by(|probe| probe.hash_cmp(&hash));
match result {
Ok(idx) => {
if let Some(p) = self.linear_search_around(idx, hash, data) {
return Some(p);
}
}
Err(_) => {}
};
None
}
fn get_or_insert<CF>(&mut self, hash: u64, mut data: D, creation_meta: CF) -> R
where
D: std::hash::Hash + std::cmp::Eq + std::fmt::Debug,
CF: FnOnce(&mut D),
{
let result = self.v.binary_search_by(|probe| probe.hash_cmp(&hash));
let index = match result {
Ok(idx) => {
if let Some(p) = self.linear_search_around(idx, hash, &data) {
return p;
}
idx
}
Err(idx) => idx,
};
creation_meta(&mut data);
let obj = R::new(data);
let weak = RW::weak_downgrade(&obj);
self.v.insert(index, WeakEntry::new(hash, weak));
return obj;
}
}