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feat: Use BTreeMap instead of a custom algo

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Kerollmops 2018-05-13 15:49:52 +02:00 committed by Clément Renault
parent 22c26a5dd0
commit bb08a9842c
1 changed files with 13 additions and 14 deletions
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27
src/map.rs
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@ -2,6 +2,8 @@ use bincode;
use fst::{self, Automaton};
use serde::de::DeserializeOwned;
use serde::ser::Serialize;
use std::collections::BTreeMap;
use std::collections::btree_map::Entry;
use std::fs::File;
use std::io::{Write, BufReader};
use std::ops::Range;
@ -109,7 +111,7 @@ impl<T> Values<T> {
#[derive(Debug)]
pub struct MapBuilder<T> {
map: Vec<(String, u64)>,
map: BTreeMap<String, u64>,
// This makes many memory indirections but it is only used
// at index time, not kept for query time.
values: Vec<Vec<T>>,
@ -118,26 +120,23 @@ pub struct MapBuilder<T> {
impl<T> MapBuilder<T> {
pub fn new() -> Self {
Self {
map: Vec::new(),
map: BTreeMap::new(),
values: Vec::new(),
}
}
pub fn insert<S: Into<String>>(&mut self, key: S, value: T) {
let key = key.into();
match self.map.binary_search_by_key(&key.as_str(), |&(ref k, _)| k) {
Ok(index) => {
let (_, index) = self.map[index];
let values = &mut self.values[index as usize];
values.push(value);
},
Err(index) => {
match self.map.entry(key) {
Entry::Vacant(e) => {
self.values.push(vec![value]);
let values_index = (self.values.len() - 1) as u64;
let value = (key, values_index);
self.map.insert(index, value);
let index = (self.values.len() - 1) as u64;
e.insert(index);
},
Entry::Occupied(e) => {
let index = *e.get();
let values = &mut self.values[index as usize];
values.push(value);
},
}
}