public FactorizedIPAddressPermission()

in activeio-core/src/main/java/org/apache/activeio/xnet/hba/FactorizedIPAddressPermission.java [40:83]
34 lines of code
10 McCabe index (conditional complexity)

    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;
        }
    }