es6/operator/defaultIfEmpty.js

import { Subscriber } from '../Subscriber';
/* tslint:disable:max-line-length */
export function defaultIfEmpty(defaultValue) {
    if (defaultValue === void 0) { defaultValue = null; }
    return this.lift(new DefaultIfEmptyOperator(defaultValue));
}
var DefaultIfEmptyOperator = (function () {
    function DefaultIfEmptyOperator(defaultValue) {
        this.defaultValue = defaultValue;
    }
    DefaultIfEmptyOperator.prototype.call = function (subscriber, source) {
        return source._subscribe(new DefaultIfEmptySubscriber(subscriber, this.defaultValue));
    };
    return DefaultIfEmptyOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var DefaultIfEmptySubscriber = (function (_super) {
    __extends(DefaultIfEmptySubscriber, _super);
    function DefaultIfEmptySubscriber(destination, defaultValue) {
        _super.call(this, destination);
        this.defaultValue = defaultValue;
        this.isEmpty = true;
    }
    DefaultIfEmptySubscriber.prototype._next = function (value) {
        this.isEmpty = false;
        this.destination.next(value);
    };
    DefaultIfEmptySubscriber.prototype._complete = function () {
        if (this.isEmpty) {
            this.destination.next(this.defaultValue);
        }
        this.destination.complete();
    };
    return DefaultIfEmptySubscriber;
}(Subscriber));
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