Subject.js
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import { Observable } from './Observable';
import { Subscription, EMPTY_SUBSCRIPTION } from './Subscription';
import { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';
import { arrRemove } from './util/arrRemove';
import { errorContext } from './util/errorContext';
export class Subject extends Observable {
constructor() {
super();
this.closed = false;
this.currentObservers = null;
this.observers = [];
this.isStopped = false;
this.hasError = false;
this.thrownError = null;
}
lift(operator) {
const subject = new AnonymousSubject(this, this);
subject.operator = operator;
return subject;
}
_throwIfClosed() {
if (this.closed) {
throw new ObjectUnsubscribedError();
}
}
next(value) {
errorContext(() => {
this._throwIfClosed();
if (!this.isStopped) {
if (!this.currentObservers) {
this.currentObservers = Array.from(this.observers);
}
for (const observer of this.currentObservers) {
observer.next(value);
}
}
});
}
error(err) {
errorContext(() => {
this._throwIfClosed();
if (!this.isStopped) {
this.hasError = this.isStopped = true;
this.thrownError = err;
const { observers } = this;
while (observers.length) {
observers.shift().error(err);
}
}
});
}
complete() {
errorContext(() => {
this._throwIfClosed();
if (!this.isStopped) {
this.isStopped = true;
const { observers } = this;
while (observers.length) {
observers.shift().complete();
}
}
});
}
unsubscribe() {
this.isStopped = this.closed = true;
this.observers = this.currentObservers = null;
}
get observed() {
var _a;
return ((_a = this.observers) === null || _a === void 0 ? void 0 : _a.length) > 0;
}
_trySubscribe(subscriber) {
this._throwIfClosed();
return super._trySubscribe(subscriber);
}
_subscribe(subscriber) {
this._throwIfClosed();
this._checkFinalizedStatuses(subscriber);
return this._innerSubscribe(subscriber);
}
_innerSubscribe(subscriber) {
const { hasError, isStopped, observers } = this;
if (hasError || isStopped) {
return EMPTY_SUBSCRIPTION;
}
this.currentObservers = null;
observers.push(subscriber);
return new Subscription(() => {
this.currentObservers = null;
arrRemove(observers, subscriber);
});
}
_checkFinalizedStatuses(subscriber) {
const { hasError, thrownError, isStopped } = this;
if (hasError) {
subscriber.error(thrownError);
}
else if (isStopped) {
subscriber.complete();
}
}
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) {
var _a, _b;
(_b = (_a = this.destination) === null || _a === void 0 ? void 0 : _a.next) === null || _b === void 0 ? void 0 : _b.call(_a, value);
}
error(err) {
var _a, _b;
(_b = (_a = this.destination) === null || _a === void 0 ? void 0 : _a.error) === null || _b === void 0 ? void 0 : _b.call(_a, err);
}
complete() {
var _a, _b;
(_b = (_a = this.destination) === null || _a === void 0 ? void 0 : _a.complete) === null || _b === void 0 ? void 0 : _b.call(_a);
}
_subscribe(subscriber) {
var _a, _b;
return (_b = (_a = this.source) === null || _a === void 0 ? void 0 : _a.subscribe(subscriber)) !== null && _b !== void 0 ? _b : EMPTY_SUBSCRIPTION;
}
}
//# sourceMappingURL=Subject.js.map