@reactivex/rxjs/dist/amd/observable/PromiseObservable.js

Reactive Extensions for modern JavaScript

var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
define(["require", "exports", '../util/root', '../Observable'], function (require, exports, root_1, Observable_1) {
    "use strict";
    /**
     * We need this JSDoc comment for affecting ESDoc.
     * @extends {Ignored}
     * @hide true
     */
    var PromiseObservable = (function (_super) {
        __extends(PromiseObservable, _super);
        function PromiseObservable(promise, scheduler) {
            if (scheduler === void 0) { scheduler = null; }
            _super.call(this);
            this.promise = promise;
            this.scheduler = scheduler;
        }
        /**
         * @param promise
         * @param scheduler
         * @return {PromiseObservable}
         * @static true
         * @name fromPromise
         * @owner Observable
         */
        PromiseObservable.create = function (promise, scheduler) {
            if (scheduler === void 0) { scheduler = null; }
            return new PromiseObservable(promise, scheduler);
        };
        PromiseObservable.prototype._subscribe = function (subscriber) {
            var _this = this;
            var promise = this.promise;
            var scheduler = this.scheduler;
            if (scheduler == null) {
                if (this._isScalar) {
                    if (!subscriber.isUnsubscribed) {
                        subscriber.next(this.value);
                        subscriber.complete();
                    }
                }
                else {
                    promise.then(function (value) {
                        _this.value = value;
                        _this._isScalar = true;
                        if (!subscriber.isUnsubscribed) {
                            subscriber.next(value);
                            subscriber.complete();
                        }
                    }, function (err) {
                        if (!subscriber.isUnsubscribed) {
                            subscriber.error(err);
                        }
                    })
                        .then(null, function (err) {
                        // escape the promise trap, throw unhandled errors
                        root_1.root.setTimeout(function () { throw err; });
                    });
                }
            }
            else {
                if (this._isScalar) {
                    if (!subscriber.isUnsubscribed) {
                        return scheduler.schedule(dispatchNext, 0, { value: this.value, subscriber: subscriber });
                    }
                }
                else {
                    promise.then(function (value) {
                        _this.value = value;
                        _this._isScalar = true;
                        if (!subscriber.isUnsubscribed) {
                            subscriber.add(scheduler.schedule(dispatchNext, 0, { value: value, subscriber: subscriber }));
                        }
                    }, function (err) {
                        if (!subscriber.isUnsubscribed) {
                            subscriber.add(scheduler.schedule(dispatchError, 0, { err: err, subscriber: subscriber }));
                        }
                    })
                        .then(null, function (err) {
                        // escape the promise trap, throw unhandled errors
                        root_1.root.setTimeout(function () { throw err; });
                    });
                }
            }
        };
        return PromiseObservable;
    }(Observable_1.Observable));
    exports.PromiseObservable = PromiseObservable;
    function dispatchNext(arg) {
        var value = arg.value, subscriber = arg.subscriber;
        if (!subscriber.isUnsubscribed) {
            subscriber.next(value);
            subscriber.complete();
        }
    }
    function dispatchError(arg) {
        var err = arg.err, subscriber = arg.subscriber;
        if (!subscriber.isUnsubscribed) {
            subscriber.error(err);
        }
    }
});
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