es6/Subject.js

import { Observable } from './Observable';
import { Subscriber } from './Subscriber';
import { Subscription } from './Subscription';
import { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';
import { SubjectSubscription } from './SubjectSubscription';
import { rxSubscriber as rxSubscriberSymbol } from './symbol/rxSubscriber';
/**
 * @class SubjectSubscriber<T>
 */
export class SubjectSubscriber extends Subscriber {
    constructor(destination) {
        super(destination);
        this.destination = destination;
    }
}
/**
 * @class Subject<T>
 */
export class Subject extends Observable {
    constructor() {
        super();
        this.observers = [];
        this.closed = false;
        this.isStopped = false;
        this.hasError = false;
        this.thrownError = null;
    }
    [rxSubscriberSymbol]() {
        return new SubjectSubscriber(this);
    }
    lift(operator) {
        const subject = new AnonymousSubject(this, this);
        subject.operator = operator;
        return subject;
    }
    next(value) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        if (!this.isStopped) {
            const { observers } = this;
            const len = observers.length;
            const copy = observers.slice();
            for (let i = 0; i < len; i++) {
                copy[i].next(value);
            }
        }
    }
    error(err) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        this.hasError = true;
        this.thrownError = err;
        this.isStopped = true;
        const { observers } = this;
        const len = observers.length;
        const copy = observers.slice();
        for (let i = 0; i < len; i++) {
            copy[i].error(err);
        }
        this.observers.length = 0;
    }
    complete() {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        this.isStopped = true;
        const { observers } = this;
        const len = observers.length;
        const copy = observers.slice();
        for (let i = 0; i < len; i++) {
            copy[i].complete();
        }
        this.observers.length = 0;
    }
    unsubscribe() {
        this.isStopped = true;
        this.closed = true;
        this.observers = null;
    }
    _trySubscribe(subscriber) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        else {
            return super._trySubscribe(subscriber);
        }
    }
    _subscribe(subscriber) {
        if (this.closed) {
            throw new ObjectUnsubscribedError();
        }
        else if (this.hasError) {
            subscriber.error(this.thrownError);
            return Subscription.EMPTY;
        }
        else if (this.isStopped) {
            subscriber.complete();
            return Subscription.EMPTY;
        }
        else {
            this.observers.push(subscriber);
            return new SubjectSubscription(this, subscriber);
        }
    }
    asObservable() {
        const observable = new Observable();
        observable.source = this;
        return observable;
    }
}
Subject.create = (destination, source) => {
    return new AnonymousSubject(destination, source);
};
/**
 * @class AnonymousSubject<T>
 */
export class AnonymousSubject extends Subject {
    constructor(destination, source) {
        super();
        this.destination = destination;
        this.source = source;
    }
    next(value) {
        const { destination } = this;
        if (destination && destination.next) {
            destination.next(value);
        }
    }
    error(err) {
        const { destination } = this;
        if (destination && destination.error) {
            this.destination.error(err);
        }
    }
    complete() {
        const { destination } = this;
        if (destination && destination.complete) {
            this.destination.complete();
        }
    }
    _subscribe(subscriber) {
        const { source } = this;
        if (source) {
            return this.source.subscribe(subscriber);
        }
        else {
            return Subscription.EMPTY;
        }
    }
}
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