protected function getSourceParams()
    {
        $params = [];
        if (Injector::inst()->has(HTTPRequest::class)) {
            /** @var HTTPRequest $request */
            $request = Injector::inst()->get(HTTPRequest::class);
            $params = $request->param('filters') ?: $request->requestVar('filters') ?: [];
        }

        $this->extend('updateSourceParams', $params);

        return $params;
    }