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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const createHash = require("../util/createHash");
/** @typedef {import("../util/Hash")} Hash */
/**
* @typedef {Object} HashableObject
* @property {function(Hash): void} updateHash
*/
class LazyHashedEtag {
/**
* @param {HashableObject} obj object with updateHash method
*/
constructor(obj) {
this._obj = obj;
this._hash = undefined;
}
/**
* @returns {string} hash of object
*/
toString() {
if (this._hash === undefined) {
const hash = createHash("md4");
this._obj.updateHash(hash);
this._hash = /** @type {string} */ (hash.digest("base64"));
}
return this._hash;
}
}
/** @type {WeakMap<HashableObject, LazyHashedEtag>} */
const map = new WeakMap();
/**
* @param {HashableObject} obj object with updateHash method
* @returns {LazyHashedEtag} etag
*/
const getter = obj => {
const hash = map.get(obj);
if (hash !== undefined) return hash;
const newHash = new LazyHashedEtag(obj);
map.set(obj, newHash);
return newHash;
};
module.exports = getter;