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import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Observable } from '../Observable';
import { OuterSubscriber } from '../OuterSubscriber';
import { InnerSubscriber } from '../InnerSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
import { MonoTypeOperatorFunction, TeardownLogic, ObservableInput } from '../types';
import { Subscription } from '../Subscription';
/**
* Returns an Observable that skips items emitted by the source Observable until a second Observable emits an item.
*
* 
*
* @param {Observable} notifier - The second Observable that has to emit an item before the source Observable's elements begin to
* be mirrored by the resulting Observable.
* @return {Observable<T>} An Observable that skips items from the source Observable until the second Observable emits
* an item, then emits the remaining items.
* @method skipUntil
* @owner Observable
*/
export function skipUntil<T>(notifier: Observable<any>): MonoTypeOperatorFunction<T> {
return (source: Observable<T>) => source.lift(new SkipUntilOperator(notifier));
}
class SkipUntilOperator<T> implements Operator<T, T> {
constructor(private notifier: Observable<any>) {
}
call(destination: Subscriber<T>, source: any): TeardownLogic {
return source.subscribe(new SkipUntilSubscriber(destination, this.notifier));
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
class SkipUntilSubscriber<T, R> extends OuterSubscriber<T, R> {
private hasValue: boolean = false;
private innerSubscription: Subscription;
constructor(destination: Subscriber<R>, notifier: ObservableInput<any>) {
super(destination);
const innerSubscriber = new InnerSubscriber(this, undefined, undefined);
this.add(innerSubscriber);
this.innerSubscription = innerSubscriber;
subscribeToResult(this, notifier, undefined, undefined, innerSubscriber);
}
protected _next(value: T) {
if (this.hasValue) {
super._next(value);
}
}
notifyNext(outerValue: T, innerValue: R,
outerIndex: number, innerIndex: number,
innerSub: InnerSubscriber<T, R>): void {
this.hasValue = true;
if (this.innerSubscription) {
this.innerSubscription.unsubscribe();
}
}
notifyComplete() {
/* do nothing */
}
}
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