es6/operator/switchMap.js

import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/* tslint:disable:max-line-length */
export function switchMap(project, resultSelector) {
    return this.lift(new SwitchMapOperator(project, resultSelector));
}
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(this, result, value, index));
    };
    SwitchMapSubscriber.prototype._complete = function () {
        var innerSubscription = this.innerSubscription;
        if (!innerSubscription || innerSubscription.closed) {
            _super.prototype._complete.call(this);
        }
    };
    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));
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