protected function setFile($file_id)
    {
        $this->data_file = array();

        if (is_numeric($file_id)) {

            $conditions = array(
                'language' => 'und',
                'file_id' => $file_id
            );

            $this->data_file = $this->file->get($conditions);

            if (empty($this->data_file)) {
                $this->outputHttpStatus(404);
            }

            $this->prepareFile($this->data_file);
        }
    }