public function setIdent($ident)
    {
        if ($ident === null) {
            $this->ident = null;
            return $this;
        }

        if (!is_string($ident)) {
            throw new InvalidArgumentException(
                'Ident needs to be a string'
            );
        }

        $this->ident = $ident;

        return $this;
    }