+++ /dev/null
-import { Observable } from '../Observable';
-import { OperatorFunction } from '../types';
-import { Subject } from '../Subject';
-import { Subscriber } from '../Subscriber';
-import { Operator } from '../Operator';
-import { SimpleOuterSubscriber, innerSubscribe, SimpleInnerSubscriber } from '../innerSubscribe';
-
-/**
- * Branch out the source Observable values as a nested Observable whenever
- * `windowBoundaries` emits.
- *
- * <span class="informal">It's like {@link buffer}, but emits a nested Observable
- * instead of an array.</span>
- *
- * ![](window.png)
- *
- * Returns an Observable that emits windows of items it collects from the source
- * Observable. The output Observable emits connected, non-overlapping
- * windows. It emits the current window and opens a new one whenever the
- * Observable `windowBoundaries` emits an item. Because each window is an
- * Observable, the output is a higher-order Observable.
- *
- * ## Example
- * In every window of 1 second each, emit at most 2 click events
- * ```ts
- * import { fromEvent, interval } from 'rxjs';
- * import { window, mergeAll, map, take } from 'rxjs/operators';
- *
- * const clicks = fromEvent(document, 'click');
- * const sec = interval(1000);
- * const result = clicks.pipe(
- * window(sec),
- * map(win => win.pipe(take(2))), // each window has at most 2 emissions
- * mergeAll(), // flatten the Observable-of-Observables
- * );
- * result.subscribe(x => console.log(x));
- * ```
- * @see {@link windowCount}
- * @see {@link windowTime}
- * @see {@link windowToggle}
- * @see {@link windowWhen}
- * @see {@link buffer}
- *
- * @param {Observable<any>} windowBoundaries An Observable that completes the
- * previous window and starts a new window.
- * @return {Observable<Observable<T>>} An Observable of windows, which are
- * Observables emitting values of the source Observable.
- * @method window
- * @owner Observable
- */
-export function window<T>(windowBoundaries: Observable<any>): OperatorFunction<T, Observable<T>> {
- return function windowOperatorFunction(source: Observable<T>) {
- return source.lift(new WindowOperator(windowBoundaries));
- };
-}
-
-class WindowOperator<T> implements Operator<T, Observable<T>> {
-
- constructor(private windowBoundaries: Observable<any>) {
- }
-
- call(subscriber: Subscriber<Observable<T>>, source: any): any {
- const windowSubscriber = new WindowSubscriber(subscriber);
- const sourceSubscription = source.subscribe(windowSubscriber);
- if (!sourceSubscription.closed) {
- windowSubscriber.add(innerSubscribe(this.windowBoundaries, new SimpleInnerSubscriber(windowSubscriber)));
- }
- return sourceSubscription;
- }
-}
-
-/**
- * We need this JSDoc comment for affecting ESDoc.
- * @ignore
- * @extends {Ignored}
- */
-class WindowSubscriber<T> extends SimpleOuterSubscriber<T, any> {
-
- private window: Subject<T> = new Subject<T>();
-
- constructor(destination: Subscriber<Observable<T>>) {
- super(destination);
- destination.next(this.window);
- }
-
- notifyNext(): void {
- this.openWindow();
- }
-
- notifyError(error: any): void {
- this._error(error);
- }
-
- notifyComplete(): void {
- this._complete();
- }
-
- protected _next(value: T): void {
- this.window.next(value);
- }
-
- protected _error(err: any): void {
- this.window.error(err);
- this.destination.error!(err);
- }
-
- protected _complete(): void {
- this.window.complete();
- this.destination.complete!();
- }
-
- /** @deprecated This is an internal implementation detail, do not use. */
- _unsubscribe() {
- this.window = null!;
- }
-
- private openWindow(): void {
- const prevWindow = this.window;
- if (prevWindow) {
- prevWindow.complete();
- }
- const destination = this.destination;
- const newWindow = this.window = new Subject<T>();
- destination.next!(newWindow);
- }
-}