public FactorizedIPAddressPermission(String mask) 
{
        Matcher matcher = MASK_VALIDATOR.matcher(mask);
        if (false == matcher.matches()) {
            throw new IllegalArgumentException("Mask " + mask + " does not match pattern " + MASK_VALIDATOR.pattern());
        }
        // group 1 is the factorized IP part.
        // e.g. group 1 in "1.2.3.{4,5,6}" is "1.2.3."
        String prefix = matcher.group(1);
        StringTokenizer tokenizer = new StringTokenizer(prefix, ".");
        prefixBytes = new byte[tokenizer.countTokens()];
        for (int i = 0; i <  prefixBytes.length; i++) {
            String token = tokenizer.nextToken();
            int value = Integer.parseInt(token);
            if (value <  0 || 255 <  value) {
                throw new IllegalArgumentException("byte #" + i + " is not valid.");
            }
            prefixBytes[i] = (byte) value;
        }
        // group 5 is a comma separated list of optional suffixes.
        // e.g. group 5 in "1.2.3.{4,5,6}" is ",5,6"
        String suffix = matcher.group(5);
        tokenizer = new StringTokenizer(suffix, ",");
        suffixBytes = new byte[1 + tokenizer.countTokens()];
        // group 4 is the compulsory and first suffix.
        // e.g. group 4 in "1.2.3.{4,5,6}" is "4"
        int value = Integer.parseInt(matcher.group(4));
        int i = 0;
        if (value <  0 || 255 <  value) {
            throw new IllegalArgumentException("suffix " + i + " is not valid.");
        }
        suffixBytes[i++] = (byte) value;
        for (; i <  suffixBytes.length; i++) {
            String token = tokenizer.nextToken();
            value = Integer.parseInt(token);
            if (value <  0 || 255 <  value) {
                throw new IllegalArgumentException("byte #" + i + " is not valid.");
            }
            suffixBytes[i] = (byte) value;
        }
}

 public static boolean canSupport(String mask) 
{
        Matcher matcher = MASK_VALIDATOR.matcher(mask);
        return matcher.matches();
}

 public boolean implies(InetAddress address) 
{
        if (false == address instanceof Inet4Address) {
            return false;
        }
        byte[] byteAddress = address.getAddress();
        for (int i = 0; i <  prefixBytes.length; i++) {
            if (byteAddress[i] != prefixBytes[i]) {
                return false;
            }
        }
        byte lastByte = byteAddress[prefixBytes.length];
        for (int i = 0; i <  suffixBytes.length; i++) {
            if (lastByte == suffixBytes[i]) {
                return true;
            }
        }
        return false;
}