public function setCaseSensitive($caseSensitive)
    {
        if (is_bool($caseSensitive)) {
            $this->caseSensitive = $caseSensitive;
        } else {
            $msg = "The attribute 'caseSensitive' must be a boolean value, '" . gettype($caseSensitive) . "'.";
            throw new InvalidArgumentException($msg);
        }
    }