work.suroh.tk/node_modules/rxjs/operators/switchMap.js

"use strict";
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 __());
};
var OuterSubscriber_1 = require('../OuterSubscriber');
var subscribeToResult_1 = require('../util/subscribeToResult');
/* tslint:enable:max-line-length */
/**
 * Projects each source value to an Observable which is merged in the output
 * Observable, emitting values only from the most recently projected Observable.
 *
 * <span class="informal">Maps each value to an Observable, then flattens all of
 * these inner Observables using {@link switch}.</span>
 *
 * <img src="./img/switchMap.png" width="100%">
 *
 * Returns an Observable that emits items based on applying a function that you
 * supply to each item emitted by the source Observable, where that function
 * returns an (so-called "inner") Observable. Each time it observes one of these
 * inner Observables, the output Observable begins emitting the items emitted by
 * that inner Observable. When a new inner Observable is emitted, `switchMap`
 * stops emitting items from the earlier-emitted inner Observable and begins
 * emitting items from the new one. It continues to behave like this for
 * subsequent inner Observables.
 *
 * @example <caption>Rerun an interval Observable on every click event</caption>
 * var clicks = Rx.Observable.fromEvent(document, 'click');
 * var result = clicks.switchMap((ev) => Rx.Observable.interval(1000));
 * result.subscribe(x => console.log(x));
 *
 * @see {@link concatMap}
 * @see {@link exhaustMap}
 * @see {@link mergeMap}
 * @see {@link switch}
 * @see {@link switchMapTo}
 *
 * @param {function(value: T, ?index: number): ObservableInput} project A function
 * that, when applied to an item emitted by the source Observable, returns an
 * Observable.
 * @param {function(outerValue: T, innerValue: I, outerIndex: number, innerIndex: number): any} [resultSelector]
 * A function to produce the value on the output Observable based on the values
 * and the indices of the source (outer) emission and the inner Observable
 * emission. The arguments passed to this function are:
 * - `outerValue`: the value that came from the source
 * - `innerValue`: the value that came from the projected Observable
 * - `outerIndex`: the "index" of the value that came from the source
 * - `innerIndex`: the "index" of the value from the projected Observable
 * @return {Observable} An Observable that emits the result of applying the
 * projection function (and the optional `resultSelector`) to each item emitted
 * by the source Observable and taking only the values from the most recently
 * projected inner Observable.
 * @method switchMap
 * @owner Observable
 */
function switchMap(project, resultSelector) {
    return function switchMapOperatorFunction(source) {
        return source.lift(new SwitchMapOperator(project, resultSelector));
    };
}
exports.switchMap = switchMap;
var SwitchMapOperator = (function () {
    function SwitchMapOperator(project, resultSelector) {
        this.project = project;
        this.resultSelector = resultSelector;
    }
    SwitchMapOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new SwitchMapSubscriber(subscriber, this.project, this.resultSelector));
    };
    return SwitchMapOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SwitchMapSubscriber = (function (_super) {
    __extends(SwitchMapSubscriber, _super);
    function SwitchMapSubscriber(destination, project, resultSelector) {
        _super.call(this, destination);
        this.project = project;
        this.resultSelector = resultSelector;
        this.index = 0;
    }
    SwitchMapSubscriber.prototype._next = function (value) {
        var result;
        var index = this.index++;
        try {
            result = this.project(value, index);
        }
        catch (error) {
            this.destination.error(error);
            return;
        }
        this._innerSub(result, value, index);
    };
    SwitchMapSubscriber.prototype._innerSub = function (result, value, index) {
        var innerSubscription = this.innerSubscription;
        if (innerSubscription) {
            innerSubscription.unsubscribe();
        }
        this.add(this.innerSubscription = subscribeToResult_1.subscribeToResult(this, result, value, index));
    };
    SwitchMapSubscriber.prototype._complete = function () {
        var innerSubscription = this.innerSubscription;
        if (!innerSubscription || innerSubscription.closed) {
            _super.prototype._complete.call(this);
        }
    };
    /** @deprecated internal use only */ SwitchMapSubscriber.prototype._unsubscribe = function () {
        this.innerSubscription = null;
    };
    SwitchMapSubscriber.prototype.notifyComplete = function (innerSub) {
        this.remove(innerSub);
        this.innerSubscription = null;
        if (this.isStopped) {
            _super.prototype._complete.call(this);
        }
    };
    SwitchMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        if (this.resultSelector) {
            this._tryNotifyNext(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            this.destination.next(innerValue);
        }
    };
    SwitchMapSubscriber.prototype._tryNotifyNext = function (outerValue, innerValue, outerIndex, innerIndex) {
        var result;
        try {
            result = this.resultSelector(outerValue, innerValue, outerIndex, innerIndex);
        }
        catch (err) {
            this.destination.error(err);
            return;
        }
        this.destination.next(result);
    };
    return SwitchMapSubscriber;
}(OuterSubscriber_1.OuterSubscriber));
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