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import { Observable } from '../Observable';
import { from } from '../observable/from';
import { Operator } from '../Operator';
import { Subscriber } from '../Subscriber';
import { Subscription } from '../Subscription';
import { isArray } from '../util/isArray';
import { ObservableInput, OperatorFunction } from '../types';
import { SimpleOuterSubscriber, SimpleInnerSubscriber, innerSubscribe } from '../innerSubscribe';
/* tslint:disable:max-line-length */
export function onErrorResumeNext<T>(): OperatorFunction<T, T>;
export function onErrorResumeNext<T, T2>(v: ObservableInput<T2>): OperatorFunction<T, T | T2>;
export function onErrorResumeNext<T, T2, T3>(v: ObservableInput<T2>, v2: ObservableInput<T3>): OperatorFunction<T, T | T2 | T3>;
export function onErrorResumeNext<T, T2, T3, T4>(v: ObservableInput<T2>, v2: ObservableInput<T3>, v3: ObservableInput<T4>): OperatorFunction<T, T | T2 | T3 | T4>;
export function onErrorResumeNext<T, T2, T3, T4, T5>(v: ObservableInput<T2>, v2: ObservableInput<T3>, v3: ObservableInput<T4>, v4: ObservableInput<T5>): OperatorFunction<T, T | T2 | T3 | T4 | T5>;
export function onErrorResumeNext<T, T2, T3, T4, T5, T6>(v: ObservableInput<T2>, v2: ObservableInput<T3>, v3: ObservableInput<T4>, v4: ObservableInput<T5>, v5: ObservableInput<T6>): OperatorFunction<T, T | T2 | T3 | T4 | T5 | T6>;
export function onErrorResumeNext<T, T2, T3, T4, T5, T6, T7>(v: ObservableInput<T2>, v2: ObservableInput<T3>, v3: ObservableInput<T4>, v4: ObservableInput<T5>, v5: ObservableInput<T6>, v6: ObservableInput<T7>): OperatorFunction<T, T | T2 | T3 | T4 | T5 | T6 | T7>;
export function onErrorResumeNext<T, R>(...observables: Array<ObservableInput<any>>): OperatorFunction<T, T | R>;
export function onErrorResumeNext<T, R>(array: ObservableInput<any>[]): OperatorFunction<T, T | R>;
/* tslint:enable:max-line-length */
/**
* When any of the provided Observable emits an complete or error notification, it immediately subscribes to the next one
* that was passed.
*
* <span class="informal">Execute series of Observables no matter what, even if it means swallowing errors.</span>
*
* 
*
* `onErrorResumeNext` is an operator that accepts a series of Observables, provided either directly as
* arguments or as an array. If no single Observable is provided, returned Observable will simply behave the same
* as the source.
*
* `onErrorResumeNext` returns an Observable that starts by subscribing and re-emitting values from the source Observable.
* When its stream of values ends - no matter if Observable completed or emitted an error - `onErrorResumeNext`
* will subscribe to the first Observable that was passed as an argument to the method. It will start re-emitting
* its values as well and - again - when that stream ends, `onErrorResumeNext` will proceed to subscribing yet another
* Observable in provided series, no matter if previous Observable completed or ended with an error. This will
* be happening until there is no more Observables left in the series, at which point returned Observable will
* complete - even if the last subscribed stream ended with an error.
*
* `onErrorResumeNext` can be therefore thought of as version of {@link concat} operator, which is more permissive
* when it comes to the errors emitted by its input Observables. While `concat` subscribes to the next Observable
* in series only if previous one successfully completed, `onErrorResumeNext` subscribes even if it ended with
* an error.
*
* Note that you do not get any access to errors emitted by the Observables. In particular do not
* expect these errors to appear in error callback passed to {@link Observable#subscribe}. If you want to take
* specific actions based on what error was emitted by an Observable, you should try out {@link catchError} instead.
*
*
* ## Example
* Subscribe to the next Observable after map fails
* ```ts
* import { of } from 'rxjs';
* import { onErrorResumeNext, map } from 'rxjs/operators';
*
* of(1, 2, 3, 0).pipe(
* map(x => {
* if (x === 0) { throw Error(); }
* return 10 / x;
* }),
* onErrorResumeNext(of(1, 2, 3)),
* )
* .subscribe(
* val => console.log(val),
* err => console.log(err), // Will never be called.
* () => console.log('that\'s it!')
* );
*
* // Logs:
* // 10
* // 5
* // 3.3333333333333335
* // 1
* // 2
* // 3
* // "that's it!"
* ```
*
* @see {@link concat}
* @see {@link catchError}
*
* @param {...ObservableInput} observables Observables passed either directly or as an array.
* @return {Observable} An Observable that emits values from source Observable, but - if it errors - subscribes
* to the next passed Observable and so on, until it completes or runs out of Observables.
* @method onErrorResumeNext
* @owner Observable
*/
export function onErrorResumeNext<T, R>(...nextSources: Array<ObservableInput<any> |
Array<ObservableInput<any>>>): OperatorFunction<T, R> {
if (nextSources.length === 1 && isArray(nextSources[0])) {
nextSources = <Array<Observable<any>>>nextSources[0];
}
return (source: Observable<T>) => source.lift(new OnErrorResumeNextOperator<T, R>(nextSources));
}
/* tslint:disable:max-line-length */
export function onErrorResumeNextStatic<R>(v: ObservableInput<R>): Observable<R>;
export function onErrorResumeNextStatic<T2, T3, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>): Observable<R>;
export function onErrorResumeNextStatic<T2, T3, T4, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>): Observable<R>;
export function onErrorResumeNextStatic<T2, T3, T4, T5, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>): Observable<R>;
export function onErrorResumeNextStatic<T2, T3, T4, T5, T6, R>(v2: ObservableInput<T2>, v3: ObservableInput<T3>, v4: ObservableInput<T4>, v5: ObservableInput<T5>, v6: ObservableInput<T6>): Observable<R>;
export function onErrorResumeNextStatic<R>(...observables: Array<ObservableInput<any> | ((...values: Array<any>) => R)>): Observable<R>;
export function onErrorResumeNextStatic<R>(array: ObservableInput<any>[]): Observable<R>;
/* tslint:enable:max-line-length */
export function onErrorResumeNextStatic<T, R>(...nextSources: Array<ObservableInput<any> |
Array<ObservableInput<any>> |
((...values: Array<any>) => R)>): Observable<R> {
let source: ObservableInput<any>|undefined = undefined;
if (nextSources.length === 1 && isArray(nextSources[0])) {
nextSources = nextSources[0] as ObservableInput<any>[];
}
// TODO: resolve issue with passing no arguments.
source = nextSources.shift()!;
return from(source).lift(new OnErrorResumeNextOperator<T, R>(nextSources));
}
class OnErrorResumeNextOperator<T, R> implements Operator<T, R> {
constructor(private nextSources: Array<ObservableInput<any>>) {
}
call(subscriber: Subscriber<R>, source: any): any {
return source.subscribe(new OnErrorResumeNextSubscriber(subscriber, this.nextSources));
}
}
class OnErrorResumeNextSubscriber<T, R> extends SimpleOuterSubscriber<T, R> {
constructor(protected destination: Subscriber<T>,
private nextSources: Array<ObservableInput<any>>) {
super(destination);
}
notifyError(): void {
this.subscribeToNextSource();
}
notifyComplete(): void {
this.subscribeToNextSource();
}
protected _error(err: any): void {
this.subscribeToNextSource();
this.unsubscribe();
}
protected _complete(): void {
this.subscribeToNextSource();
this.unsubscribe();
}
private subscribeToNextSource(): void {
const next = this.nextSources.shift();
if (!!next) {
const innerSubscriber = new SimpleInnerSubscriber(this);
const destination = this.destination as Subscription;
destination.add(innerSubscriber);
const innerSubscription = innerSubscribe(next, innerSubscriber);
// The returned subscription will usually be the subscriber that was
// passed. However, interop subscribers will be wrapped and for
// unsubscriptions to chain correctly, the wrapper needs to be added, too.
if (innerSubscription !== innerSubscriber) {
destination.add(innerSubscription);
}
} else {
this.destination.complete();
}
}
}