es6/observable/ArrayObservable.js

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);
    }
    _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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