diffusion/src/internal/events/stream.js

Diffusion JavaScript client

"use strict";
var __values = (this && this.__values) || function(o) {
    var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0;
    if (m) return m.call(o);
    if (o && typeof o.length === "number") return {
        next: function () {
            if (o && i >= o.length) o = void 0;
            return { value: o && o[i++], done: !o };
        }
    };
    throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined.");
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.StreamImpl = void 0;
/**
 * Implementation of the {@link Stream} interface.
 *
 * @inheritdoc
 */
var StreamImpl = /** @class */ (function () {
    /**
     * Create a new `Stream` object
     *
     * @param  listeners the listeners that will be attached to this stream
     * @param  error     a callback to call in the case of an error
     * @param  close     a callback to call when the stream is closed
     * @param  events    a list of allowed event names. If `events` is not specified
     *                   then any events are allowed in the `on` and `off`
     *                   methods. If events are specified, then any event
     *                   listener will be checked agains the list of allowed
     *                   events. The events `close`, `error`, and `complete` are
     *                   always allowed because they are used by {@link Stream}
     *                   and {@link Result} internally.
     */
    function StreamImpl(helper) {
        this.listeners = helper.getListeners();
        this.errorCallback = helper.getErrorCallback();
        this.closeCallback = helper.getCloseCallback();
    }
    /**
     * @inheritdoc
     */
    StreamImpl.prototype.on = function (events, listener) {
        this.attach(events, listener);
        return this;
    };
    /**
     * @inheritdoc
     */
    StreamImpl.prototype.off = function (events, listener) {
        this.remove(events, listener);
        return this;
    };
    /**
     * @inheritdoc
     *
     * Will cause `closeCallback` to be called.
     *
     * @param reason the reason for closing the stream. This can be of any type.
     *               The type of the close reason should be documented in the
     *               class extending StreamImpl.
     */
    StreamImpl.prototype.close = function (reason) {
        this.closeCallback(reason);
        return this;
    };
    /**
     * Close the stream. This will emit a 'close' event to any assigned listeners.
     * No further events will be emitted.
     */
    StreamImpl.prototype.error = function (reason) {
        this.errorCallback(reason);
        return this;
    };
    /**
     * Set one or more properties on an object;
     *
     * @param {Object} object - The object to attach properties to
     * @param {String|Object} key - The key, or an object map of properties
     * @param {*} value - If the key is a string, this is the value to be associated with it
     *
     * @returns The object, with attached properties
     */
    StreamImpl.prototype.attach = function (key, value) {
        var e_1, _a;
        if (typeof key === 'object') {
            try {
                for (var _b = __values(Object.keys(key)), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var k = _c.value;
                    this.attach(k, key[k]);
                }
            }
            catch (e_1_1) { e_1 = { error: e_1_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_1) throw e_1.error; }
            }
        }
        else if (value) {
            if (!this.listeners.hasOwnProperty(key)) { // eslint-disable-line no-prototype-builtins
                this.listeners[key] = [];
            }
            this.listeners[key].push(value);
        }
    };
    /**
     * Remove one or more properties from an object
     *
     * @param {Object} object - The object to remove properties from
     * @param {String|Object} key - The key, or an object map of properties
     * @param {*} value - If the key is a string, this is the value to remove from it
     *
     * @returns The object, sans specified properties
     */
    StreamImpl.prototype.remove = function (key, value) {
        var e_2, _a;
        if (typeof key === 'object') {
            try {
                for (var _b = __values(Object.keys(key)), _c = _b.next(); !_c.done; _c = _b.next()) {
                    var k = _c.value;
                    this.remove(k, key[k]);
                }
            }
            catch (e_2_1) { e_2 = { error: e_2_1 }; }
            finally {
                try {
                    if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
                }
                finally { if (e_2) throw e_2.error; }
            }
        }
        else if (this.listeners.hasOwnProperty(key)) { // eslint-disable-line no-prototype-builtins
            if (value) {
                this.listeners[key] = this.listeners[key].filter(function (e) {
                    return e !== value;
                });
            }
            else {
                this.listeners[key] = [];
            }
        }
    };
    return StreamImpl;
}());
exports.StreamImpl = StreamImpl;