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import { Notification } from '../Notification';
import { OperatorFunction, ObservableNotification } from '../types';
import { operate } from '../util/lift';
import { createOperatorSubscriber } from './OperatorSubscriber';
/**
* Represents all of the notifications from the source Observable as `next`
* emissions marked with their original types within {@link Notification}
* objects.
*
* <span class="informal">Wraps `next`, `error` and `complete` emissions in
* {@link Notification} objects, emitted as `next` on the output Observable.
* </span>
*
* 
*
* `materialize` returns an Observable that emits a `next` notification for each
* `next`, `error`, or `complete` emission of the source Observable. When the
* source Observable emits `complete`, the output Observable will emit `next` as
* a Notification of type "complete", and then it will emit `complete` as well.
* When the source Observable emits `error`, the output will emit `next` as a
* Notification of type "error", and then `complete`.
*
* This operator is useful for producing metadata of the source Observable, to
* be consumed as `next` emissions. Use it in conjunction with
* {@link dematerialize}.
*
* ## Example
*
* Convert a faulty Observable to an Observable of Notifications
*
* ```ts
* import { of, materialize, map } from 'rxjs';
*
* const letters = of('a', 'b', 13, 'd');
* const upperCase = letters.pipe(map((x: any) => x.toUpperCase()));
* const materialized = upperCase.pipe(materialize());
*
* materialized.subscribe(x => console.log(x));
*
* // Results in the following:
* // - Notification { kind: 'N', value: 'A', error: undefined, hasValue: true }
* // - Notification { kind: 'N', value: 'B', error: undefined, hasValue: true }
* // - Notification { kind: 'E', value: undefined, error: TypeError { message: x.toUpperCase is not a function }, hasValue: false }
* ```
*
* @see {@link Notification}
* @see {@link dematerialize}
*
* @return A function that returns an Observable that emits
* {@link Notification} objects that wrap the original emissions from the
* source Observable with metadata.
*/
export function materialize<T>(): OperatorFunction<T, Notification<T> & ObservableNotification<T>> {
return operate((source, subscriber) => {
source.subscribe(
createOperatorSubscriber(
subscriber,
(value) => {
subscriber.next(Notification.createNext(value));
},
() => {
subscriber.next(Notification.createComplete());
subscriber.complete();
},
(err) => {
subscriber.next(Notification.createError(err));
subscriber.complete();
}
)
);
});
}