protected function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'csrf_parameter' => '_csrf_token',
            'csrf_protection' => true,
            'collection_type' => FormCollectionInterface::COLLECTION_TYPE_ALL,
            'locale' => 'en_EN',
            'fallback_locales' => array('en_EN'),
            'translator_paths' => array(),
            'config_paths' => array(),
            'validation_groups' => null
        ));

        $resolver->setAllowedValues('collection_type', array(FormCollectionInterface::COLLECTION_TYPE_ALL, FormCollectionInterface::COLLECTION_TYPE_ANY, FormCollectionInterface::COLLECTION_TYPE_MANY, FormCollectionInterface::COLLECTION_TYPE_ONE));
    }