/**
 * Various IP address utils
 *
 * @author Charles Johnson
  */
public class IpConvert {
        /**
        * For testing purposes
        *
        * @param args Test arguments
        */
        public static void main(String[] args) {
                System.out.println(toHex(args[0]));
                System.out.println(ipToLong(args[0]));
        }

        /**
        * Convert an IP address to a hex string
        *
        * @param ipAddress Input IP address
        *
        * @return The IP address in hex form
        */
        public static String toHex(String ipAddress) {
                return Long.toHexString(IpConvert.ipToLong(ipAddress));
        }

        /**
        * Convert an IP address to a number
        *
        * @param ipAddress Input IP address
        *
        * @return The IP address as a number
        */
        public static long ipToLong(String ipAddress) {
                long result = 0;
                String[] atoms = ipAddress.split("\\.");

                for (int i = 3; i >= 0; i--) {
                        result |= (Long.parseLong(atoms[3 - i]) << (i * 8));
                }

                return result & 0xFFFFFFFF;
        }
}