work.suroh.tk/node_modules/rxjs/_esm2015/observable/ArrayObservable.js

109 lines
3.7 KiB
JavaScript

import { Observable } from '../Observable';
import { ScalarObservable } from './ScalarObservable';
import { EmptyObservable } from './EmptyObservable';
import { isScheduler } from '../util/isScheduler';
/**
* We need this JSDoc comment for affecting ESDoc.
* @extends {Ignored}
* @hide true
*/
export class ArrayObservable extends Observable {
constructor(array, scheduler) {
super();
this.array = array;
this.scheduler = scheduler;
if (!scheduler && array.length === 1) {
this._isScalar = true;
this.value = array[0];
}
}
static create(array, scheduler) {
return new ArrayObservable(array, scheduler);
}
/**
* Creates an Observable that emits some values you specify as arguments,
* immediately one after the other, and then emits a complete notification.
*
* <span class="informal">Emits the arguments you provide, then completes.
* </span>
*
* <img src="./img/of.png" width="100%">
*
* This static operator is useful for creating a simple Observable that only
* emits the arguments given, and the complete notification thereafter. It can
* be used for composing with other Observables, such as with {@link concat}.
* By default, it uses a `null` IScheduler, which means the `next`
* notifications are sent synchronously, although with a different IScheduler
* it is possible to determine when those notifications will be delivered.
*
* @example <caption>Emit 10, 20, 30, then 'a', 'b', 'c', then start ticking every second.</caption>
* var numbers = Rx.Observable.of(10, 20, 30);
* var letters = Rx.Observable.of('a', 'b', 'c');
* var interval = Rx.Observable.interval(1000);
* var result = numbers.concat(letters).concat(interval);
* result.subscribe(x => console.log(x));
*
* @see {@link create}
* @see {@link empty}
* @see {@link never}
* @see {@link throw}
*
* @param {...T} values Arguments that represent `next` values to be emitted.
* @param {Scheduler} [scheduler] A {@link IScheduler} to use for scheduling
* the emissions of the `next` notifications.
* @return {Observable<T>} An Observable that emits each given input value.
* @static true
* @name of
* @owner Observable
*/
static of(...array) {
let scheduler = array[array.length - 1];
if (isScheduler(scheduler)) {
array.pop();
}
else {
scheduler = null;
}
const len = array.length;
if (len > 1) {
return new ArrayObservable(array, scheduler);
}
else if (len === 1) {
return new ScalarObservable(array[0], scheduler);
}
else {
return new EmptyObservable(scheduler);
}
}
static dispatch(state) {
const { array, index, count, subscriber } = state;
if (index >= count) {
subscriber.complete();
return;
}
subscriber.next(array[index]);
if (subscriber.closed) {
return;
}
state.index = index + 1;
this.schedule(state);
}
/** @deprecated internal use only */ _subscribe(subscriber) {
let index = 0;
const array = this.array;
const count = array.length;
const scheduler = this.scheduler;
if (scheduler) {
return scheduler.schedule(ArrayObservable.dispatch, 0, {
array, index, count, subscriber
});
}
else {
for (let i = 0; i < count && !subscriber.closed; i++) {
subscriber.next(array[i]);
}
subscriber.complete();
}
}
}
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