node_modules/rxjs/_esm5/operators/take.js

/** PURE_IMPORTS_START .._Subscriber,.._util_ArgumentOutOfRangeError,.._observable_EmptyObservable PURE_IMPORTS_END */
var __extends = (this && this.__extends) || function (d, b) {
    for (var p in b)
        if (b.hasOwnProperty(p))
            d[p] = b[p];
    function __() { this.constructor = d; }
    d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
import { Subscriber } from '../Subscriber';
import { ArgumentOutOfRangeError } from '../util/ArgumentOutOfRangeError';
import { EmptyObservable } from '../observable/EmptyObservable';
/**
 * Emits only the first `count` values emitted by the source Observable.
 *
 * <span class="informal">Takes the first `count` values from the source, then
 * completes.</span>
 *
 * <img src="./img/take.png" width="100%">
 *
 * `take` returns an Observable that emits only the first `count` values emitted
 * by the source Observable. If the source emits fewer than `count` values then
 * all of its values are emitted. After that, it completes, regardless if the
 * source completes.
 *
 * @example <caption>Take the first 5 seconds of an infinite 1-second interval Observable</caption>
 * var interval = Rx.Observable.interval(1000);
 * var five = interval.take(5);
 * five.subscribe(x => console.log(x));
 *
 * @see {@link takeLast}
 * @see {@link takeUntil}
 * @see {@link takeWhile}
 * @see {@link skip}
 *
 * @throws {ArgumentOutOfRangeError} When using `take(i)`, it delivers an
 * ArgumentOutOrRangeError to the Observer's `error` callback if `i < 0`.
 *
 * @param {number} count The maximum number of `next` values to emit.
 * @return {Observable<T>} An Observable that emits only the first `count`
 * values emitted by the source Observable, or all of the values from the source
 * if the source emits fewer than `count` values.
 * @method take
 * @owner Observable
 */
export function take(count) {
    return function (source) {
        if (count === 0) {
            return new EmptyObservable();
        }
        else {
            return source.lift(new TakeOperator(count));
        }
    };
}
var TakeOperator = /*@__PURE__*/ (/*@__PURE__*/ function () {
    function TakeOperator(total) {
        this.total = total;
        if (this.total < 0) {
            throw new ArgumentOutOfRangeError;
        }
    }
    TakeOperator.prototype.call = function (subscriber, source) {
        return source.subscribe(new TakeSubscriber(subscriber, this.total));
    };
    return TakeOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var TakeSubscriber = /*@__PURE__*/ (/*@__PURE__*/ function (_super) {
    __extends(TakeSubscriber, _super);
    function TakeSubscriber(destination, total) {
        _super.call(this, destination);
        this.total = total;
        this.count = 0;
    }
    TakeSubscriber.prototype._next = function (value) {
        var total = this.total;
        var count = ++this.count;
        if (count <= total) {
            this.destination.next(value);
            if (count === total) {
                this.destination.complete();
                this.unsubscribe();
            }
        }
    };
    return TakeSubscriber;
}(Subscriber));
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