work.suroh.tk/node_modules/rxjs/_esm2015/operators/dematerialize.js

65 lines
2.2 KiB
JavaScript

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