/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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*/
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"use strict";
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/**
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* @template T, K, C
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* @typedef {import("./SerializerMiddleware")<T, K, C>} SerializerMiddleware
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*/
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/**
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* @template DeserializedValue
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* @template SerializedValue
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* @template Context
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*/
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class Serializer {
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/**
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* @param {SerializerMiddleware<EXPECTED_ANY, EXPECTED_ANY, EXPECTED_ANY>[]} middlewares serializer middlewares
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* @param {Context=} context context
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*/
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constructor(middlewares, context) {
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this.serializeMiddlewares = middlewares.slice();
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this.deserializeMiddlewares = middlewares.slice().reverse();
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this.context = context;
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}
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/**
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* @template ExtendedContext
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* @param {DeserializedValue | Promise<DeserializedValue>} obj object
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* @param {Context & ExtendedContext} context context object
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* @returns {Promise<SerializedValue>} result
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*/
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serialize(obj, context) {
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const ctx = { ...context, ...this.context };
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let current = obj;
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for (const middleware of this.serializeMiddlewares) {
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if (
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current &&
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typeof (/** @type {Promise<DeserializedValue>} */ (current).then) ===
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"function"
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) {
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current =
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/** @type {Promise<DeserializedValue>} */
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(current).then(data => data && middleware.serialize(data, ctx));
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} else if (current) {
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try {
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current = middleware.serialize(current, ctx);
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} catch (err) {
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current = Promise.reject(err);
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}
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} else break;
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}
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return /** @type {Promise<SerializedValue>} */ (current);
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}
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/**
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* @template ExtendedContext
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* @param {SerializedValue | Promise<SerializedValue>} value value
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* @param {Context & ExtendedContext} context object
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* @returns {Promise<DeserializedValue>} result
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*/
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deserialize(value, context) {
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const ctx = { ...context, ...this.context };
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let current = value;
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for (const middleware of this.deserializeMiddlewares) {
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current =
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current &&
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typeof (/** @type {Promise<SerializedValue>} */ (current).then) ===
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"function"
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? /** @type {Promise<SerializedValue>} */ (current).then(data =>
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middleware.deserialize(data, ctx)
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)
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: middleware.deserialize(current, ctx);
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}
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return /** @type {Promise<DeserializedValue>} */ (current);
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}
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}
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module.exports = Serializer;
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