public function createStoredFieldsFiles()
    {
        $this->_fdxFile = $this->_directory->createFile($this->_name . '.fdx');
        $this->_fdtFile = $this->_directory->createFile($this->_name . '.fdt');

        $this->_files[] = $this->_name . '.fdx';
        $this->_files[] = $this->_name . '.fdt';
    }