combineLatest.js
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import { isScheduler } from '../util/isScheduler';
import { isArray } from '../util/isArray';
import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
import { fromArray } from './fromArray';
const NONE = {};
export function combineLatest(...observables) {
let resultSelector = undefined;
let scheduler = undefined;
if (isScheduler(observables[observables.length - 1])) {
scheduler = observables.pop();
}
if (typeof observables[observables.length - 1] === 'function') {
resultSelector = observables.pop();
}
if (observables.length === 1 && isArray(observables[0])) {
observables = observables[0];
}
return fromArray(observables, scheduler).lift(new CombineLatestOperator(resultSelector));
}
export class CombineLatestOperator {
constructor(resultSelector) {
this.resultSelector = resultSelector;
}
call(subscriber, source) {
return source.subscribe(new CombineLatestSubscriber(subscriber, this.resultSelector));
}
}
export class CombineLatestSubscriber extends OuterSubscriber {
constructor(destination, resultSelector) {
super(destination);
this.resultSelector = resultSelector;
this.active = 0;
this.values = [];
this.observables = [];
}
_next(observable) {
this.values.push(NONE);
this.observables.push(observable);
}
_complete() {
const observables = this.observables;
const len = observables.length;
if (len === 0) {
this.destination.complete();
}
else {
this.active = len;
this.toRespond = len;
for (let i = 0; i < len; i++) {
const observable = observables[i];
this.add(subscribeToResult(this, observable, undefined, i));
}
}
}
notifyComplete(unused) {
if ((this.active -= 1) === 0) {
this.destination.complete();
}
}
notifyNext(_outerValue, innerValue, outerIndex) {
const values = this.values;
const oldVal = values[outerIndex];
const toRespond = !this.toRespond
? 0
: oldVal === NONE ? --this.toRespond : this.toRespond;
values[outerIndex] = innerValue;
if (toRespond === 0) {
if (this.resultSelector) {
this._tryResultSelector(values);
}
else {
this.destination.next(values.slice());
}
}
}
_tryResultSelector(values) {
let result;
try {
result = this.resultSelector.apply(this, values);
}
catch (err) {
this.destination.error(err);
return;
}
this.destination.next(result);
}
}
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