es6/observable/ForkJoinObservable.js

import { Observable } from '../Observable';
import { EmptyObservable } from './EmptyObservable';
import { isArray } from '../util/isArray';
import { subscribeToResult } from '../util/subscribeToResult';
import { OuterSubscriber } from '../OuterSubscriber';
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
export class ForkJoinObservable extends Observable {
    constructor(sources, resultSelector) {
        super();
        this.sources = sources;
        this.resultSelector = resultSelector;
    }
    /* tslint:enable:max-line-length */
    /**
     * @param sources
     * @return {any}
     * @static true
     * @name forkJoin
     * @owner Observable
     */
    static create(...sources) {
        if (sources === null || arguments.length === 0) {
            return new EmptyObservable();
        }
        let resultSelector = null;
        if (typeof sources[sources.length - 1] === 'function') {
            resultSelector = sources.pop();
        }
        // if the first and only other argument besides the resultSelector is an array
        // assume it's been called with `forkJoin([obs1, obs2, obs3], resultSelector)`
        if (sources.length === 1 && isArray(sources[0])) {
            sources = sources[0];
        }
        if (sources.length === 0) {
            return new EmptyObservable();
        }
        return new ForkJoinObservable(sources, resultSelector);
    }
    _subscribe(subscriber) {
        return new ForkJoinSubscriber(subscriber, this.sources, this.resultSelector);
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class ForkJoinSubscriber extends OuterSubscriber {
    constructor(destination, sources, resultSelector) {
        super(destination);
        this.sources = sources;
        this.resultSelector = resultSelector;
        this.completed = 0;
        this.haveValues = 0;
        const len = sources.length;
        this.total = len;
        this.values = new Array(len);
        for (let i = 0; i < len; i++) {
            const source = sources[i];
            const innerSubscription = subscribeToResult(this, source, null, i);
            if (innerSubscription) {
                innerSubscription.outerIndex = i;
                this.add(innerSubscription);
            }
        }
    }
    notifyNext(outerValue, innerValue, outerIndex, innerIndex, innerSub) {
        this.values[outerIndex] = innerValue;
        if (!innerSub._hasValue) {
            innerSub._hasValue = true;
            this.haveValues++;
        }
    }
    notifyComplete(innerSub) {
        const destination = this.destination;
        const { haveValues, resultSelector, values } = this;
        const len = values.length;
        if (!innerSub._hasValue) {
            destination.complete();
            return;
        }
        this.completed++;
        if (this.completed !== len) {
            return;
        }
        if (haveValues === len) {
            const value = resultSelector ? resultSelector.apply(this, values) : values;
            destination.next(value);
        }
        destination.complete();
    }
}
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