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{ Operator } from './Operator';\nimport { Observer } from './Observer';\nimport { Observable } from './Observable';\nimport { Subscriber } from './Subscriber';\nimport { ISubscription, Subscription, TeardownLogic } from './Subscription';\nimport { ObjectUnsubscribedError } from './util/ObjectUnsubscribedError';\nimport { SubjectSubscription } from './SubjectSubscription';\nimport { rxSubscriber as rxSubscriberSymbol } from './symbol/rxSubscriber';\n\n/**\n * @class SubjectSubscriber<T>\n */\nexport class SubjectSubscriber<T> extends Subscriber<T> {\n constructor(protected destination: Subject<T>) {\n super(destination);\n }\n}\n\n/**\n * @class Subject<T>\n */\nexport class Subject<T> extends Observable<T> implements ISubscription {\n\n [rxSubscriberSymbol]() {\n return new SubjectSubscriber(this);\n }\n\n observers: Observer<T>[] = [];\n\n closed = false;\n\n isStopped = false;\n\n hasError = false;\n\n thrownError: any = null;\n\n constructor() {\n super();\n }\n\n static create: Function = <T>(destination: Observer<T>, source: Observable<T>): AnonymousSubject<T> => {\n return new AnonymousSubject<T>(destination, source);\n }\n\n lift<R>(operator: Operator<T, R>): Observable<R> {\n const subject = new AnonymousSubject(this, this);\n subject.operator = <any>operator;\n return <any>subject;\n }\n\n next(value?: T) {\n if (this.closed) {\n throw new ObjectUnsubscribedError();\n }\n if (!this.isStopped) {\n const { observers } = this;\n const len = observers.length;\n const copy = observers.slice();\n for (let i = 0; i < len; i++) {\n copy[i].next(value);\n }\n }\n }\n\n error(err: any) {\n if (this.closed) {\n throw new ObjectUnsubscribedError();\n }\n this.hasError = true;\n this.thrownError = err;\n this.isStopped = true;\n const { observers } = this;\n const len = observers.length;\n const copy = observers.slice();\n for (let i = 0; i < len; i++) {\n copy[i].error(err);\n }\n this.observers.length = 0;\n }\n\n complete() {\n if (this.closed) {\n throw new ObjectUnsubscribedError();\n }\n this.isStopped = true;\n const { observers } = this;\n const len = observers.length;\n const copy = observers.slice();\n for (let i = 0; i < len; i++) {\n copy[i].complete();\n }\n this.observers.length = 0;\n }\n\n unsubscribe() {\n this.isStopped = true;\n this.closed = true;\n this.observers = null;\n }\n\n protected _trySubscribe(subscriber: Subscriber<T>): TeardownLogic {\n if (this.closed) {\n throw new ObjectUnsubscribedError();\n } else {\n return super._trySubscribe(subscriber);\n }\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>): Subscription {\n if (this.closed) {\n throw new ObjectUnsubscribedError();\n } else if (this.hasError) {\n subscriber.error(this.thrownError);\n return Subscription.EMPTY;\n } else if (this.isStopped) {\n subscriber.complete();\n return Subscription.EMPTY;\n } else {\n this.observers.push(subscriber);\n return new SubjectSubscription(this, subscriber);\n }\n }\n\n asObservable(): Observable<T> {\n const observable = new Observable<T>();\n (<any>observable).source = this;\n return observable;\n }\n}\n\n/**\n * @class AnonymousSubject<T>\n */\nexport class AnonymousSubject<T> extends Subject<T> {\n constructor(protected destination?: Observer<T>, source?: Observable<T>) {\n super();\n this.source = source;\n }\n\n next(value: T) {\n const { destination } = this;\n if (destination && destination.next) {\n destination.next(value);\n }\n }\n\n error(err: any) {\n const { destination } = this;\n if (destination && destination.error) {\n this.destination.error(err);\n }\n }\n\n complete() {\n const { destination } = this;\n if (destination && destination.complete) {\n this.destination.complete();\n }\n }\n\n /** @deprecated internal use only */ _subscribe(subscriber: Subscriber<T>): Subscription {\n const { source } = this;\n if (source) {\n return this.source.subscribe(subscriber);\n } else {\n return Subscription.EMPTY;\n }\n }\n}\n"]} |