| import { Subscriber } from '../Subscriber'; |
| import { Notification } from '../Notification'; |
| /** |
| * 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> |
| * |
| * <img src="./img/materialize.png" width="100%"> |
| * |
| * `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 <caption>Convert a faulty Observable to an Observable of Notifications</caption> |
| * var letters = Rx.Observable.of('a', 'b', 13, 'd'); |
| * var upperCase = letters.map(x => x.toUpperCase()); |
| * var materialized = upperCase.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: |
| * // x.toUpperCase is not a function at MapSubscriber.letters.map.x |
| * // [as project] (http://1…, hasValue: false} |
| * |
| * @see {@link Notification} |
| * @see {@link dematerialize} |
| * |
| * @return {Observable<Notification<T>>} An Observable that emits |
| * {@link Notification} objects that wrap the original emissions from the source |
| * Observable with metadata. |
| * @method materialize |
| * @owner Observable |
| */ |
| export function materialize() { |
| return function materializeOperatorFunction(source) { |
| return source.lift(new MaterializeOperator()); |
| }; |
| } |
| class MaterializeOperator { |
| call(subscriber, source) { |
| return source.subscribe(new MaterializeSubscriber(subscriber)); |
| } |
| } |
| /** |
| * We need this JSDoc comment for affecting ESDoc. |
| * @ignore |
| * @extends {Ignored} |
| */ |
| class MaterializeSubscriber extends Subscriber { |
| constructor(destination) { |
| super(destination); |
| } |
| _next(value) { |
| this.destination.next(Notification.createNext(value)); |
| } |
| _error(err) { |
| const destination = this.destination; |
| destination.next(Notification.createError(err)); |
| destination.complete(); |
| } |
| _complete() { |
| const destination = this.destination; |
| destination.next(Notification.createComplete()); |
| destination.complete(); |
| } |
| } |
| //# sourceMappingURL=materialize.js.map |