class AdvaggFormBase

abstract class AdvaggFormBase extends ConfigFormBase {
    
    /**
     * The AdvAgg file status state information storage service.
     *
     * @var \Drupal\Core\State\StateInterface
     */
    protected $advaggFiles;
    
    /**
     * The AdvAgg aggregates state information storage service.
     *
     * @var \Drupal\Core\State\StateInterface
     */
    protected $advaggAggregates;
    
    /**
     * The request stack.
     *
     * @var \Symfony\Component\HttpFoundation\RequestStack
     */
    protected $requestStack;
    
    /**
     * Constructs a SettingsForm object.
     *
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The factory for configuration objects.
     * @param \Drupal\Core\State\StateInterface $advagg_files
     *   The AdvAgg file status state information storage service.
     * @param \Drupal\Core\State\StateInterface $advagg_aggregates
     *   The AdvAgg aggregate state information storage service.
     * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
     *   The request stack.
     */
    public function __construct(ConfigFactoryInterface $config_factory, StateInterface $advagg_files, StateInterface $advagg_aggregates, RequestStack $request_stack) {
        parent::__construct($config_factory);
        $this->advaggFiles = $advagg_files;
        $this->advaggAggregates = $advagg_aggregates;
        $this->requestStack = $request_stack;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('config.factory'), $container->get('state.advagg.files'), $container->get('state.advagg.aggregates'), $container->get('request_stack'));
    }
    
    /**
     * Checks if the form was submitted by AJAX.
     *
     * @return bool
     *   TRUE if the form was submitted via AJAX, otherwise FALSE.
     */
    protected function isAjax() {
        $request = $this->requestStack
            ->getCurrentRequest();
        if ($request->query
            ->has(FormBuilderInterface::AJAX_FORM_REQUEST)) {
            return TRUE;
        }
        return FALSE;
    }

}