import {Operator} from '../Operator';
import {Subscriber} from '../Subscriber';
import {Observable} from '../Observable';
import {Subject} from '../Subject';
import {Subscription} from '../Subscription';
import {tryCatch} from '../util/tryCatch';
import {errorObject} from '../util/errorObject';
import {OuterSubscriber} from '../OuterSubscriber';
import {subscribeToResult} from '../util/subscribeToResult';
export function windowToggle<T, O>(openings: Observable<O>,
closingSelector: (openValue: O) => Observable<any>): Observable<Observable<T>> {
return this.lift(new WindowToggleOperator(openings, closingSelector));
}
class WindowToggleOperator<T, O> implements Operator<T, Observable<T>> {
constructor(private openings: Observable<O>,
private closingSelector: (openValue: O) => Observable<any>) {
}
call(subscriber: Subscriber<Observable<T>>): Subscriber<T> {
return new WindowToggleSubscriber(
subscriber, this.openings, this.closingSelector
);
}
}
interface WindowContext<T> {
window: Subject<T>;
subscription: Subscription;
}
class WindowToggleSubscriber<T, R, O> extends OuterSubscriber<T, R> {
private contexts: WindowContext<T>[] = [];
private openSubscription: Subscription;
constructor(destination: Subscriber<Observable<T>>,
private openings: Observable<O>,
private closingSelector: (openValue: O) => Observable<any>) {
super(destination);
this.add(this.openSubscription = subscribeToResult(this, openings, openings));
}
protected _next(value: T) {
const { contexts } = this;
Eif (contexts) {
const len = contexts.length;
for (let i = 0; i < len; i++) {
contexts[i].window.next(value);
}
}
}
protected _error(err: any) {
const { contexts } = this;
this.contexts = null;
Eif (contexts) {
const len = contexts.length;
let index = -1;
while (++index < len) {
const context = contexts[index];
context.window.error(err);
context.subscription.unsubscribe();
}
}
super._error(err);
}
protected _complete() {
const { contexts } = this;
this.contexts = null;
Eif (contexts) {
const len = contexts.length;
let index = -1;
while (++index < len) {
const context = contexts[index];
context.window.complete();
context.subscription.unsubscribe();
}
}
super._complete();
}
_unsubscribe() {
const { contexts } = this;
this.contexts = null;
if (contexts) {
const len = contexts.length;
let index = -1;
while (++index < len) {
const context = contexts[index];
context.window.unsubscribe();
context.subscription.unsubscribe();
}
}
}
notifyNext(outerValue: any, innerValue: any, outerIndex: number, innerIndex: number): void {
if (outerValue === this.openings) {
const { closingSelector } = this;
const closingNotifier = tryCatch(closingSelector)(innerValue);
if (closingNotifier === errorObject) {
return this.error(errorObject.e);
} else {
const window = new Subject<T>();
const subscription = new Subscription();
const context = { window, subscription };
this.contexts.push(context);
const innerSubscription = subscribeToResult(this, closingNotifier, context);
(<any> innerSubscription).context = context;
subscription.add(innerSubscription);
this.destination.next(window);
}
} else {
this.closeWindow(this.contexts.indexOf(outerValue));
}
}
notifyError(err: any): void {
this.error(err);
}
notifyComplete(inner: Subscription): void {
if (inner !== this.openSubscription) {
this.closeWindow(this.contexts.indexOf((<any> inner).context));
}
}
closeWindow(index: number) {
const { contexts } = this;
const context = contexts[index];
const { window, subscription } = context;
contexts.splice(index, 1);
window.complete();
subscription.unsubscribe();
}
}
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