es6/operator/repeat.js

import { Subscriber } from '../Subscriber';
import { EmptyObservable } from '../observable/EmptyObservable';
/**
 * 返回的 Observable 重复由源 Observable 所发出的项的流，最多可以重复 count 次。
 *
 * <img src="./img/repeat.png" width="100%">
 *
 * @param {number} [count] 源 Observable 项重复的次数，如果 count 为0则产生一个空的 Observable 。
 * @return {Observable} 该 Observable 重复由源 Observable 所发出的项的流，最多可以重复 count 次。
 * @method repeat
 * @owner Observable
 */
export function repeat(count = -1) {
    if (count === 0) {
        return new EmptyObservable();
    }
    else if (count < 0) {
        return this.lift(new RepeatOperator(-1, this));
    }
    else {
        return this.lift(new RepeatOperator(count - 1, this));
    }
}
class RepeatOperator {
    constructor(count, source) {
        this.count = count;
        this.source = source;
    }
    call(subscriber, source) {
        return source.subscribe(new RepeatSubscriber(subscriber, this.count, this.source));
    }
}
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
class RepeatSubscriber extends Subscriber {
    constructor(destination, count, source) {
        super(destination);
        this.count = count;
        this.source = source;
    }
    complete() {
        if (!this.isStopped) {
            const { source, count } = this;
            if (count === 0) {
                return super.complete();
            }
            else if (count > -1) {
                this.count = count - 1;
            }
            source.subscribe(this._unsubscribeAndRecycle());
        }
    }
}
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