+++ /dev/null
-import { Operator } from '../Operator';
-import { Subscriber } from '../Subscriber';
-import { Observable } from '../Observable';
-import { Subject } from '../Subject';
-import { OperatorFunction } from '../types';
-
-/**
- * Branch out the source Observable values as a nested Observable with each
- * nested Observable emitting at most `windowSize` values.
- *
- * <span class="informal">It's like {@link bufferCount}, but emits a nested
- * Observable instead of an array.</span>
- *
- * ![](windowCount.png)
- *
- * Returns an Observable that emits windows of items it collects from the source
- * Observable. The output Observable emits windows every `startWindowEvery`
- * items, each containing no more than `windowSize` items. When the source
- * Observable completes or encounters an error, the output Observable emits
- * the current window and propagates the notification from the source
- * Observable. If `startWindowEvery` is not provided, then new windows are
- * started immediately at the start of the source and when each window completes
- * with size `windowSize`.
- *
- * ## Examples
- * Ignore every 3rd click event, starting from the first one
- * ```ts
- * import { fromEvent } from 'rxjs';
- * import { windowCount, map, mergeAll, skip } from 'rxjs/operators';
- *
- * const clicks = fromEvent(document, 'click');
- * const result = clicks.pipe(
- * windowCount(3),
- * map(win => win.pipe(skip(1))), // skip first of every 3 clicks
- * mergeAll() // flatten the Observable-of-Observables
- * );
- * result.subscribe(x => console.log(x));
- * ```
- *
- * Ignore every 3rd click event, starting from the third one
- * ```ts
- * import { fromEvent } from 'rxjs';
- * import { windowCount, mergeAll } from 'rxjs/operators';
- *
- * const clicks = fromEvent(document, 'click');
- * const result = clicks.pipe(
- * windowCount(2, 3),
- * mergeAll(), // flatten the Observable-of-Observables
- * );
- * result.subscribe(x => console.log(x));
- * ```
- *
- * @see {@link window}
- * @see {@link windowTime}
- * @see {@link windowToggle}
- * @see {@link windowWhen}
- * @see {@link bufferCount}
- *
- * @param {number} windowSize The maximum number of values emitted by each
- * window.
- * @param {number} [startWindowEvery] Interval at which to start a new window.
- * For example if `startWindowEvery` is `2`, then a new window will be started
- * on every other value from the source. A new window is started at the
- * beginning of the source by default.
- * @return {Observable<Observable<T>>} An Observable of windows, which in turn
- * are Observable of values.
- * @method windowCount
- * @owner Observable
- */
-export function windowCount<T>(windowSize: number,
- startWindowEvery: number = 0): OperatorFunction<T, Observable<T>> {
- return function windowCountOperatorFunction(source: Observable<T>) {
- return source.lift(new WindowCountOperator<T>(windowSize, startWindowEvery));
- };
-}
-
-class WindowCountOperator<T> implements Operator<T, Observable<T>> {
-
- constructor(private windowSize: number,
- private startWindowEvery: number) {
- }
-
- call(subscriber: Subscriber<Observable<T>>, source: any): any {
- return source.subscribe(new WindowCountSubscriber(subscriber, this.windowSize, this.startWindowEvery));
- }
-}
-
-/**
- * We need this JSDoc comment for affecting ESDoc.
- * @ignore
- * @extends {Ignored}
- */
-class WindowCountSubscriber<T> extends Subscriber<T> {
- private windows: Subject<T>[] = [ new Subject<T>() ];
- private count: number = 0;
-
- constructor(protected destination: Subscriber<Observable<T>>,
- private windowSize: number,
- private startWindowEvery: number) {
- super(destination);
- destination.next(this.windows[0]);
- }
-
- protected _next(value: T) {
- const startWindowEvery = (this.startWindowEvery > 0) ? this.startWindowEvery : this.windowSize;
- const destination = this.destination;
- const windowSize = this.windowSize;
- const windows = this.windows;
- const len = windows.length;
-
- for (let i = 0; i < len && !this.closed; i++) {
- windows[i].next(value);
- }
- const c = this.count - windowSize + 1;
- if (c >= 0 && c % startWindowEvery === 0 && !this.closed) {
- windows.shift().complete();
- }
- if (++this.count % startWindowEvery === 0 && !this.closed) {
- const window = new Subject<T>();
- windows.push(window);
- destination.next(window);
- }
- }
-
- protected _error(err: any) {
- const windows = this.windows;
- if (windows) {
- while (windows.length > 0 && !this.closed) {
- windows.shift().error(err);
- }
- }
- this.destination.error(err);
- }
-
- protected _complete() {
- const windows = this.windows;
- if (windows) {
- while (windows.length > 0 && !this.closed) {
- windows.shift().complete();
- }
- }
- this.destination.complete();
- }
-
- protected _unsubscribe() {
- this.count = 0;
- this.windows = null;
- }
-}