/**
* Caching version of InetAddress.getByName(getOption("host")).getAddress(), which is slow. Caches
* numeric host names only. Will resolve but not cache resolution of DNS host names.
*
* @return IP or null
* @since 0.9.3
*/
public byte[] getIP() {
if (_ip != null) return _ip;
byte[] rv = null;
String host = getHost();
if (host != null) {
rv = Addresses.getIP(host);
if (rv != null
&& (host.replaceAll("[0-9\\.]", "").length() == 0
|| host.replaceAll("[0-9a-fA-F:]", "").length() == 0)) {
_ip = rv;
}
}
return rv;
}
