public function __construct($str)
{
if (strstr($str, $this->getProtocol() . '://') !== 0) {
$str = $this->getProtocol() . '://' . $str;
}
parent::__construct($str);
if (!isset($this->pieces["host"]) || empty($this->pieces['host'])) {
throw new \InvalidArgumentException("Host can't be empty");
}
if (!isset($this->pieces["path"]) || empty($this->pieces['path'])) {
throw new \InvalidArgumentException("Database can't be empty");
}
}