65 lines
2.2 KiB
JavaScript
65 lines
2.2 KiB
JavaScript
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import { Subscriber } from '../Subscriber';
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/**
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* Converts an Observable of {@link Notification} objects into the emissions
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* that they represent.
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*
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* <span class="informal">Unwraps {@link Notification} objects as actual `next`,
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* `error` and `complete` emissions. The opposite of {@link materialize}.</span>
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*
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* <img src="./img/dematerialize.png" width="100%">
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*
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* `dematerialize` is assumed to operate an Observable that only emits
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* {@link Notification} objects as `next` emissions, and does not emit any
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* `error`. Such Observable is the output of a `materialize` operation. Those
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* notifications are then unwrapped using the metadata they contain, and emitted
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* as `next`, `error`, and `complete` on the output Observable.
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*
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* Use this operator in conjunction with {@link materialize}.
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*
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* @example <caption>Convert an Observable of Notifications to an actual Observable</caption>
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* var notifA = new Rx.Notification('N', 'A');
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* var notifB = new Rx.Notification('N', 'B');
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* var notifE = new Rx.Notification('E', void 0,
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* new TypeError('x.toUpperCase is not a function')
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* );
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* var materialized = Rx.Observable.of(notifA, notifB, notifE);
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* var upperCase = materialized.dematerialize();
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* upperCase.subscribe(x => console.log(x), e => console.error(e));
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*
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* // Results in:
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* // A
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* // B
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* // TypeError: x.toUpperCase is not a function
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*
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* @see {@link Notification}
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* @see {@link materialize}
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*
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* @return {Observable} An Observable that emits items and notifications
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* embedded in Notification objects emitted by the source Observable.
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* @method dematerialize
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* @owner Observable
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*/
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export function dematerialize() {
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return function dematerializeOperatorFunction(source) {
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return source.lift(new DeMaterializeOperator());
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};
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}
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class DeMaterializeOperator {
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call(subscriber, source) {
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return source.subscribe(new DeMaterializeSubscriber(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 DeMaterializeSubscriber 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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value.observe(this.destination);
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}
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}
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//# sourceMappingURL=dematerialize.js.map
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