80 lines
3.0 KiB
JavaScript
80 lines
3.0 KiB
JavaScript
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import { Subscriber } from '../Subscriber';
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import { Notification } from '../Notification';
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/**
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* Represents all of the notifications from the source Observable as `next`
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* emissions marked with their original types within {@link Notification}
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* objects.
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*
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* <span class="informal">Wraps `next`, `error` and `complete` emissions in
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* {@link Notification} objects, emitted as `next` on the output Observable.
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* </span>
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*
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* <img src="./img/materialize.png" width="100%">
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*
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* `materialize` returns an Observable that emits a `next` notification for each
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* `next`, `error`, or `complete` emission of the source Observable. When the
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* source Observable emits `complete`, the output Observable will emit `next` as
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* a Notification of type "complete", and then it will emit `complete` as well.
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* When the source Observable emits `error`, the output will emit `next` as a
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* Notification of type "error", and then `complete`.
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*
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* This operator is useful for producing metadata of the source Observable, to
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* be consumed as `next` emissions. Use it in conjunction with
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* {@link dematerialize}.
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*
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* @example <caption>Convert a faulty Observable to an Observable of Notifications</caption>
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* var letters = Rx.Observable.of('a', 'b', 13, 'd');
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* var upperCase = letters.map(x => x.toUpperCase());
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* var materialized = upperCase.materialize();
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* materialized.subscribe(x => console.log(x));
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*
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* // Results in the following:
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* // - Notification {kind: "N", value: "A", error: undefined, hasValue: true}
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* // - Notification {kind: "N", value: "B", error: undefined, hasValue: true}
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* // - Notification {kind: "E", value: undefined, error: TypeError:
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* // x.toUpperCase is not a function at MapSubscriber.letters.map.x
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* // [as project] (http://1…, hasValue: false}
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*
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* @see {@link Notification}
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* @see {@link dematerialize}
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*
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* @return {Observable<Notification<T>>} An Observable that emits
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* {@link Notification} objects that wrap the original emissions from the source
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* Observable with metadata.
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* @method materialize
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* @owner Observable
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*/
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export function materialize() {
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return function materializeOperatorFunction(source) {
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return source.lift(new MaterializeOperator());
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};
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}
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class MaterializeOperator {
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call(subscriber, source) {
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return source.subscribe(new MaterializeSubscriber(subscriber));
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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 MaterializeSubscriber extends Subscriber {
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constructor(destination) {
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super(destination);
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}
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_next(value) {
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this.destination.next(Notification.createNext(value));
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}
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_error(err) {
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const destination = this.destination;
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destination.next(Notification.createError(err));
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destination.complete();
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}
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_complete() {
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const destination = this.destination;
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destination.next(Notification.createComplete());
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destination.complete();
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}
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}
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//# sourceMappingURL=materialize.js.map
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