es6/observable/UsingObservable.js

import { Observable } from '../Observable';
import { subscribeToResult } from '../util/subscribeToResult';
import { OuterSubscriber } from '../OuterSubscriber';
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @extends {Ignored}
 * @hide true
 */
export var UsingObservable = (function (_super) {
    __extends(UsingObservable, _super);
    function UsingObservable(resourceFactory, observableFactory) {
        _super.call(this);
        this.resourceFactory = resourceFactory;
        this.observableFactory = observableFactory;
    }
    UsingObservable.create = function (resourceFactory, observableFactory) {
        return new UsingObservable(resourceFactory, observableFactory);
    };
    UsingObservable.prototype._subscribe = function (subscriber) {
        var _a = this, resourceFactory = _a.resourceFactory, observableFactory = _a.observableFactory;
        var resource;
        try {
            resource = resourceFactory();
            return new UsingSubscriber(subscriber, resource, observableFactory);
        }
        catch (err) {
            subscriber.error(err);
        }
    };
    return UsingObservable;
}(Observable));
var UsingSubscriber = (function (_super) {
    __extends(UsingSubscriber, _super);
    function UsingSubscriber(destination, resource, observableFactory) {
        _super.call(this, destination);
        this.resource = resource;
        this.observableFactory = observableFactory;
        destination.add(resource);
        this.tryUse();
    }
    UsingSubscriber.prototype.tryUse = function () {
        try {
            var source = this.observableFactory.call(this, this.resource);
            if (source) {
                this.add(subscribeToResult(this, source));
            }
        }
        catch (err) {
            this._error(err);
        }
    };
    return UsingSubscriber;
}(OuterSubscriber));
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