import {isNumeric} from '../util/isNumeric';
import {Scheduler} from '../Scheduler';
import {Observable} from '../Observable';
import {asap} from '../scheduler/asap';
import {isScheduler} from '../util/isScheduler';
import {isDate} from '../util/isDate';
import {Subscription} from '../Subscription';
import {Subscriber} from '../Subscriber';
export class TimerObservable extends Observable<number> {
static create(IdueTime: number | Date = 0, period?: number | Scheduler, scheduler?: Scheduler): Observable<number> {
return new TimerObservable(dueTime, period, scheduler);
}
static dispatch(state: any) {
const { index, period, subscriber } = state;
const action = (<any> this);
subscriber.next(index);
if (subscriber.isUnsubscribed) {
return;
} else if (period === -1) {
return subscriber.complete();
}
state.index = index + 1;
action.schedule(state, period);
}
private period: number = -1;
private dueTime: number = 0;
private scheduler: Scheduler;
constructor(IdueTime: number | Date = 0,
period?: number | Scheduler,
scheduler?: Scheduler) {
super();
if (isNumeric(period)) {
this.period = Number(period) < 1 && 1 || Number(period);
} else if (isScheduler(period)) {
scheduler = <Scheduler> period;
}
if (!isScheduler(scheduler)) {
scheduler = asap;
}
this.scheduler = scheduler;
this.dueTime = isDate(dueTime) ?
(+dueTime - this.scheduler.now()) :
(<number> dueTime);
}
protected _subscribe(subscriber: Subscriber<number>): Subscription | Function | void {
const index = 0;
const { period, dueTime, scheduler } = this;
return scheduler.schedule(TimerObservable.dispatch, dueTime, {
index, period, subscriber
});
}
}
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