src/Factory/Form/AbstractCustomizableFieldsetFactory.php
protected function getCustomizationOptions(ContainerInterface $container, $requestedName, array $options = null)
    {
        if (!static::OPTIONS_NAME) {
            throw new \RuntimeException('The class constants "OPTIONS_NAME" must be non empty.');
        }

        return $container->get(static::OPTIONS_NAME);
    }
protected function getCustomizationOptions(ContainerInterface $container, $requestedName, array $options = null)
    {
        if (!static::OPTIONS_NAME) {
            throw new \RuntimeException('The class constants "OPTIONS_NAME" must be non empty.');
        }

        return $container->get(static::OPTIONS_NAME);
    }
Get the customization options.

@param ContainerInterface $container
@param string             $requestedName
@param array              $options

@return \Core\Options\FieldsetCustomizationOptions
@throws \RuntimeException