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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2014-present Raymond Hill
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
'use strict';
export class MRUCache {
constructor(maxSize) {
this.maxSize = maxSize;
this.array = [];
this.map = new Map();
this.resetTime = Date.now();
}
add(key, value) {
const found = this.map.has(key);
this.map.set(key, value);
if ( found ) { return; }
if ( this.array.length === this.maxSize ) {
this.map.delete(this.array.pop());
}
this.array.unshift(key);
}
remove(key) {
if ( this.map.delete(key) === false ) { return; }
this.array.splice(this.array.indexOf(key), 1);
}
lookup(key) {
const value = this.map.get(key);
if ( value === undefined ) { return; }
if ( this.array[0] === key ) { return value; }
const i = this.array.indexOf(key);
this.array.copyWithin(1, 0, i);
this.array[0] = key;
return value;
}
reset() {
this.array = [];
this.map.clear();
this.resetTime = Date.now();
}
}
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