import { Operator } from './Operator';
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import { Observable } from './Observable';
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import { Subscriber } from './Subscriber';
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import { Subscription } from './Subscription';
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import { Observer, SubscriptionLike, TeardownLogic } from './types';
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import { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';
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import { SubjectSubscription } from './SubjectSubscription';
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import { rxSubscriber as rxSubscriberSymbol } from '../internal/symbol/rxSubscriber';
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/**
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* @class SubjectSubscriber<T>
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*/
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export class SubjectSubscriber<T> extends Subscriber<T> {
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constructor(protected destination: Subject<T>) {
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super(destination);
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}
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}
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/**
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* A Subject is a special type of Observable that allows values to be
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* multicasted to many Observers. Subjects are like EventEmitters.
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*
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* Every Subject is an Observable and an Observer. You can subscribe to a
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* Subject, and you can call next to feed values as well as error and complete.
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*
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* @class Subject<T>
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*/
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export class Subject<T> extends Observable<T> implements SubscriptionLike {
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[rxSubscriberSymbol]() {
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return new SubjectSubscriber(this);
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}
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observers: Observer<T>[] = [];
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closed = false;
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isStopped = false;
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hasError = false;
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thrownError: any = null;
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constructor() {
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super();
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}
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/**@nocollapse
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* @deprecated use new Subject() instead
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*/
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static create: Function = <T>(destination: Observer<T>, source: Observable<T>): AnonymousSubject<T> => {
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return new AnonymousSubject<T>(destination, source);
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}
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lift<R>(operator: Operator<T, R>): Observable<R> {
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const subject = new AnonymousSubject(this, this);
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subject.operator = <any>operator;
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return <any>subject;
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}
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next(value?: T) {
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if (this.closed) {
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throw new ObjectUnsubscribedError();
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}
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if (!this.isStopped) {
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const { observers } = this;
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const len = observers.length;
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const copy = observers.slice();
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for (let i = 0; i < len; i++) {
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copy[i].next(value);
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}
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}
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}
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error(err: any) {
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if (this.closed) {
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throw new ObjectUnsubscribedError();
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}
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this.hasError = true;
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this.thrownError = err;
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this.isStopped = true;
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const { observers } = this;
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const len = observers.length;
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const copy = observers.slice();
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for (let i = 0; i < len; i++) {
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copy[i].error(err);
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}
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this.observers.length = 0;
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}
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complete() {
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if (this.closed) {
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throw new ObjectUnsubscribedError();
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}
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this.isStopped = true;
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const { observers } = this;
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const len = observers.length;
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const copy = observers.slice();
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for (let i = 0; i < len; i++) {
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copy[i].complete();
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}
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this.observers.length = 0;
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}
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unsubscribe() {
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this.isStopped = true;
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this.closed = true;
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this.observers = null;
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}
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/** @deprecated This is an internal implementation detail, do not use. */
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_trySubscribe(subscriber: Subscriber<T>): TeardownLogic {
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if (this.closed) {
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throw new ObjectUnsubscribedError();
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} else {
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return super._trySubscribe(subscriber);
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}
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}
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/** @deprecated This is an internal implementation detail, do not use. */
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_subscribe(subscriber: Subscriber<T>): Subscription {
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if (this.closed) {
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throw new ObjectUnsubscribedError();
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} else if (this.hasError) {
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subscriber.error(this.thrownError);
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return Subscription.EMPTY;
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} else if (this.isStopped) {
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subscriber.complete();
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return Subscription.EMPTY;
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} else {
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this.observers.push(subscriber);
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return new SubjectSubscription(this, subscriber);
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}
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}
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/**
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* Creates a new Observable with this Subject as the source. You can do this
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* to create customize Observer-side logic of the Subject and conceal it from
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* code that uses the Observable.
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* @return {Observable} Observable that the Subject casts to
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*/
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asObservable(): Observable<T> {
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const observable = new Observable<T>();
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(<any>observable).source = this;
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return observable;
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}
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}
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/**
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* @class AnonymousSubject<T>
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*/
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export class AnonymousSubject<T> extends Subject<T> {
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constructor(protected destination?: Observer<T>, source?: Observable<T>) {
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super();
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this.source = source;
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}
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next(value: T) {
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const { destination } = this;
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if (destination && destination.next) {
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destination.next(value);
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}
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}
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error(err: any) {
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const { destination } = this;
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if (destination && destination.error) {
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this.destination.error(err);
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}
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}
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complete() {
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const { destination } = this;
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if (destination && destination.complete) {
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this.destination.complete();
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}
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}
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/** @deprecated This is an internal implementation detail, do not use. */
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_subscribe(subscriber: Subscriber<T>): Subscription {
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const { source } = this;
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if (source) {
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return this.source.subscribe(subscriber);
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} else {
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return Subscription.EMPTY;
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}
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}
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}
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