public function manipulate($value, $row = array(), $fieldName = '') {
        $type = $this->type;
        if ($type && is_callable(array($this, $type))) {
            return $this->$type($value, $row, $fieldName);
        } else {
            error_log('Invalid Data Manipulator type: "' . $type . '"');
            return $value . ' (Invalid Type: "' . $type . '")';
        }
    }