es6/operator/catch.js

import { OuterSubscriber } from '../OuterSubscriber';
import { subscribeToResult } from '../util/subscribeToResult';
/**
 * Catches errors on the observable to be handled by returning a new observable or throwing an error.
 * @param {function} selector a function that takes as arguments `err`, which is the error, and `caught`, which
 *  is the source observable, in case you'd like to "retry" that observable by returning it again. Whatever observable
 *  is returned by the `selector` will be used to continue the observable chain.
 * @return {Observable} an observable that originates from either the source or the observable returned by the
 *  catch `selector` function.
 * @method catch
 * @owner Observable
 */
export function _catch(selector) {
    var operator = new CatchOperator(selector);
    var caught = this.lift(operator);
    return (operator.caught = caught);
}
var CatchOperator = (function () {
    function CatchOperator(selector) {
        this.selector = selector;
    }
    CatchOperator.prototype.call = function (subscriber, source) {
        return source._subscribe(new CatchSubscriber(subscriber, this.selector, this.caught));
    };
    return CatchOperator;
}());
/**
 * We need this JSDoc comment for affecting ESDoc.
 * @ignore
 * @extends {Ignored}
 */
var CatchSubscriber = (function (_super) {
    __extends(CatchSubscriber, _super);
    function CatchSubscriber(destination, selector, caught) {
        _super.call(this, destination);
        this.selector = selector;
        this.caught = caught;
    }
    // NOTE: overriding `error` instead of `_error` because we don't want
    // to have this flag this subscriber as `isStopped`.
    CatchSubscriber.prototype.error = function (err) {
        if (!this.isStopped) {
            var result = void 0;
            try {
                result = this.selector(err, this.caught);
            }
            catch (err) {
                this.destination.error(err);
                return;
            }
            this.unsubscribe();
            this.destination.remove(this);
            subscribeToResult(this, result);
        }
    };
    return CatchSubscriber;
}(OuterSubscriber));
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