"use strict";

var indexOf = require("es5-ext/array/#/e-index-of");

module.exports = function () {
	var lastId = 0, argsMap = [], cache = [];
	return {
		get: function (args) {
			var index = indexOf.call(argsMap, args[0]);
			return index === -1 ? null : cache[index];
		},
		set: function (args) {
			argsMap.push(args[0]);
			cache.push(++lastId);
			return lastId;
		},
		delete: function (id) {
			var index = indexOf.call(cache, id);
			if (index !== -1) {
				argsMap.splice(index, 1);
				cache.splice(index, 1);
			}
		},
		clear: function () {
			argsMap = [];
			cache = [];
		}
	};
};