| 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 = null; |
| let scheduler = null; |
| 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, observable, i)); |
| } |
| } |
| } |
| notifyComplete(unused) { |
| if ((this.active -= 1) === 0) { |
| this.destination.complete(); |
| } |
| } |
| notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) { |
| 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); |
| } |
| } |
| //# sourceMappingURL=combineLatest.js.map |