@reactivex/rxjs/dist/amd/observable/IfObservable.js

Reactive Extensions for modern JavaScript

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 __());
};
define(["require", "exports", '../Observable', '../util/subscribeToResult', '../OuterSubscriber'], function (require, exports, Observable_1, subscribeToResult_1, OuterSubscriber_1) {
    "use strict";
    /**
     * We need this JSDoc comment for affecting ESDoc.
     * @extends {Ignored}
     * @hide true
     */
    var IfObservable = (function (_super) {
        __extends(IfObservable, _super);
        function IfObservable(condition, thenSource, elseSource) {
            _super.call(this);
            this.condition = condition;
            this.thenSource = thenSource;
            this.elseSource = elseSource;
        }
        IfObservable.create = function (condition, thenSource, elseSource) {
            return new IfObservable(condition, thenSource, elseSource);
        };
        IfObservable.prototype._subscribe = function (subscriber) {
            var _a = this, condition = _a.condition, thenSource = _a.thenSource, elseSource = _a.elseSource;
            return new IfSubscriber(subscriber, condition, thenSource, elseSource);
        };
        return IfObservable;
    }(Observable_1.Observable));
    exports.IfObservable = IfObservable;
    var IfSubscriber = (function (_super) {
        __extends(IfSubscriber, _super);
        function IfSubscriber(destination, condition, thenSource, elseSource) {
            _super.call(this, destination);
            this.condition = condition;
            this.thenSource = thenSource;
            this.elseSource = elseSource;
            this.tryIf();
        }
        IfSubscriber.prototype.tryIf = function () {
            var _a = this, condition = _a.condition, thenSource = _a.thenSource, elseSource = _a.elseSource;
            var result;
            try {
                result = condition();
                var source = result ? thenSource : elseSource;
                if (source) {
                    this.add(subscribeToResult_1.subscribeToResult(this, source));
                }
                else {
                    this._complete();
                }
            }
            catch (err) {
                this._error(err);
            }
        };
        return IfSubscriber;
    }(OuterSubscriber_1.OuterSubscriber));
});
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