Subject.js
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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 '../internal/symbol/rxSubscriber';
export class SubjectSubscriber extends Subscriber {
constructor(destination) {
super(destination);
this.destination = destination;
}
}
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);
};
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;
}
}
}
//# sourceMappingURL=Subject.js.map