switchMap.js
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import { map } from './map';
import { from } from '../observable/from';
import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';
export function switchMap(project, resultSelector) {
if (typeof resultSelector === 'function') {
return (source) => source.pipe(switchMap((a, i) => from(project(a, i)).pipe(map((b, ii) => resultSelector(a, b, i, ii)))));
}
return (source) => source.lift(new SwitchMapOperator(project));
}
class SwitchMapOperator {
constructor(project) {
this.project = project;
}
call(subscriber, source) {
return source.subscribe(new SwitchMapSubscriber(subscriber, this.project));
}
}
class SwitchMapSubscriber extends SimpleOuterSubscriber {
constructor(destination, project) {
super(destination);
this.project = project;
this.index = 0;
}
_next(value) {
let result;
const index = this.index++;
try {
result = this.project(value, index);
}
catch (error) {
this.destination.error(error);
return;
}
this._innerSub(result);
}
_innerSub(result) {
const innerSubscription = this.innerSubscription;
if (innerSubscription) {
innerSubscription.unsubscribe();
}
const innerSubscriber = new SimpleInnerSubscriber(this);
const destination = this.destination;
destination.add(innerSubscriber);
this.innerSubscription = innerSubscribe(result, innerSubscriber);
if (this.innerSubscription !== innerSubscriber) {
destination.add(this.innerSubscription);
}
}
_complete() {
const { innerSubscription } = this;
if (!innerSubscription || innerSubscription.closed) {
super._complete();
}
this.unsubscribe();
}
_unsubscribe() {
this.innerSubscription = undefined;
}
notifyComplete() {
this.innerSubscription = undefined;
if (this.isStopped) {
super._complete();
}
}
notifyNext(innerValue) {
this.destination.next(innerValue);
}
}
//# sourceMappingURL=switchMap.js.map