import { Operator } from '../Operator';
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import { Subscriber } from '../Subscriber';
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import { Subscription } from '../Subscription';
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import { Observable } from '../Observable';
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import { MonoTypeOperatorFunction, TeardownLogic } from '../types';
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/**
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* Returns an Observable that mirrors the source Observable, but will call a specified function when
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* the source terminates on complete or error.
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* @param {function} callback Function to be called when source terminates.
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* @return {Observable} An Observable that mirrors the source, but will call the specified function on termination.
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* @method finally
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* @owner Observable
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*/
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export function finalize<T>(callback: () => void): MonoTypeOperatorFunction<T> {
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return (source: Observable<T>) => source.lift(new FinallyOperator(callback));
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}
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class FinallyOperator<T> implements Operator<T, T> {
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constructor(private callback: () => void) {
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}
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call(subscriber: Subscriber<T>, source: any): TeardownLogic {
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return source.subscribe(new FinallySubscriber(subscriber, this.callback));
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}
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}
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/**
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* We need this JSDoc comment for affecting ESDoc.
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* @ignore
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* @extends {Ignored}
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*/
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class FinallySubscriber<T> extends Subscriber<T> {
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constructor(destination: Subscriber<T>, callback: () => void) {
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super(destination);
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this.add(new Subscription(callback));
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}
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}
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