work.suroh.tk/node_modules/rxjs/_esm5/observable/EmptyObservable.js

83 lines
3.0 KiB
JavaScript

/** PURE_IMPORTS_START .._Observable PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
for (var p in b)
if (b.hasOwnProperty(p))
d[p] = b[p];
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { Observable } from '../Observable';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export var EmptyObservable = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
__extends(EmptyObservable, _super);
function EmptyObservable(scheduler) {
_super.call(this);
this.scheduler = scheduler;
}
/**
* Creates an Observable that emits no items to the Observer and immediately
* emits a complete notification.
*
* <span class="informal">Just emits 'complete', and nothing else.
* </span>
*
* <img src="./img/empty.png" width="100%">
*
* This static operator is useful for creating a simple Observable that only
* emits the complete notification. It can be used for composing with other
* Observables, such as in a {@link mergeMap}.
*
* @example <caption>Emit the number 7, then complete.</caption>
* var result = Rx.Observable.empty().startWith(7);
* result.subscribe(x => console.log(x));
*
* @example <caption>Map and flatten only odd numbers to the sequence 'a', 'b', 'c'</caption>
* var interval = Rx.Observable.interval(1000);
* var result = interval.mergeMap(x =>
* x % 2 === 1 ? Rx.Observable.of('a', 'b', 'c') : Rx.Observable.empty()
* );
* result.subscribe(x => console.log(x));
*
* // Results in the following to the console:
* // x is equal to the count on the interval eg(0,1,2,3,...)
* // x will occur every 1000ms
* // if x % 2 is equal to 1 print abc
* // if x % 2 is not equal to 1 nothing will be output
*
* @see {@link create}
* @see {@link never}
* @see {@link of}
* @see {@link throw}
*
* @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
* the emission of the complete notification.
* @return {Observable} An "empty" Observable: emits only the complete
* notification.
* @static true
* @name empty
* @owner Observable
*/
EmptyObservable.create = function (scheduler) {
return new EmptyObservable(scheduler);
};
EmptyObservable.dispatch = function (arg) {
var subscriber = arg.subscriber;
subscriber.complete();
};
/** @deprecated internal use only */ EmptyObservable.prototype._subscribe = function (subscriber) {
var scheduler = this.scheduler;
if (scheduler) {
return scheduler.schedule(EmptyObservable.dispatch, 0, { subscriber: subscriber });
}
else {
subscriber.complete();
}
};
return EmptyObservable;
}(Observable));
//# sourceMappingURL=EmptyObservable.js.map