public function setMimeType($mimeType)
    {
        if ($mimeType instanceof MimeType) {
            $this->mimeType = $mimeType;
        } elseif (is_array($mimeType)) {
            $this->mimeType = new MimeType($mimeType);
        } else {
            $this->mimeType = null;
            trigger_error('Argument must be an object of class MimeType. Data loss!', E_USER_WARNING);
        }

        return $this;
    }