/**
 * 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;
	}
}