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import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Observable } from '../Observable';
import { OperatorFunction } from '../types';
export function isEmpty<T>(): OperatorFunction<T, boolean> {
return (source: Observable<T>) => source.lift(new IsEmptyOperator());
}
class IsEmptyOperator implements Operator<any, boolean> {
call (observer: Subscriber<boolean>, source: any): any {
return source.subscribe(new IsEmptySubscriber(observer));
}
}
/**
* We need this JSDoc comment for affecting ESDoc.
* @ignore
* @extends {Ignored}
*/
class IsEmptySubscriber extends Subscriber<any> {
constructor(destination: Subscriber<boolean>) {
super(destination);
}
private notifyComplete(isEmpty: boolean): void {
const destination = this.destination;
destination.next(isEmpty);
destination.complete();
}
protected _next(value: boolean) {
this.notifyComplete(false);
}
protected _complete() {
this.notifyComplete(true);
}
}
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