es6/operator/exhaustMap.js

import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/* tslint:disable:max-line-length */
export function exhaustMap(project, resultSelector) {
    return this.lift(new SwitchFirstMapOperator(project, resultSelector));
}
var SwitchFirstMapOperator = (function () {
    function SwitchFirstMapOperator(project, resultSelector) {
        this.project = project;
        this.resultSelector = resultSelector;
    }
    SwitchFirstMapOperator.prototype.call = function (subscriber, source) {
        return source._subscribe(new SwitchFirstMapSubscriber(subscriber, this.project, this.resultSelector));
    };
    return SwitchFirstMapOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var SwitchFirstMapSubscriber = (function (_super) {
    __extends(SwitchFirstMapSubscriber, _super);
    function SwitchFirstMapSubscriber(destination, project, resultSelector) {
        _super.call(this, destination);
        this.project = project;
        this.resultSelector = resultSelector;
        this.hasSubscription = false;
        this.hasCompleted = false;
        this.index = 0;
    }
    SwitchFirstMapSubscriber.prototype._next = function (value) {
        if (!this.hasSubscription) {
            this.tryNext(value);
        }
    };
    SwitchFirstMapSubscriber.prototype.tryNext = function (value) {
        var index = this.index++;
        var destination = this.destination;
        try {
            var result = this.project(value, index);
            this.hasSubscription = true;
            this.add(subscribeToResult(this, result, value, index));
        }
        catch (err) {
            destination.error(err);
        }
    };
    SwitchFirstMapSubscriber.prototype._complete = function () {
        this.hasCompleted = true;
        if (!this.hasSubscription) {
            this.destination.complete();
        }
    };
    SwitchFirstMapSubscriber.prototype.notifyNext = function (outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        if (resultSelector) {
            this.trySelectResult(outerValue, innerValue, outerIndex, innerIndex);
        }
        else {
            destination.next(innerValue);
        }
    };
    SwitchFirstMapSubscriber.prototype.trySelectResult = function (outerValue, innerValue, outerIndex, innerIndex) {
        var _a = this, resultSelector = _a.resultSelector, destination = _a.destination;
        try {
            var result = resultSelector(outerValue, innerValue, outerIndex, innerIndex);
            destination.next(result);
        }
        catch (err) {
            destination.error(err);
        }
    };
    SwitchFirstMapSubscriber.prototype.notifyError = function (err) {
        this.destination.error(err);
    };
    SwitchFirstMapSubscriber.prototype.notifyComplete = function (innerSub) {
        this.remove(innerSub);
        this.hasSubscription = false;
        if (this.hasCompleted) {
            this.destination.complete();
        }
    };
    return SwitchFirstMapSubscriber;
}(OuterSubscriber));
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