public NetmaskIPv6AddressPermission()

in activeio-core/src/main/java/org/apache/activeio/xnet/hba/NetmaskIPv6AddressPermission.java [40:76]

35 lines of code
6 McCabe index (conditional complexity)


    public NetmaskIPv6AddressPermission(String mask) {
        Matcher matcher = MASK_VALIDATOR.matcher(mask);
        if (false == matcher.matches()) {
            throw new IllegalArgumentException("Mask " + mask + " does not match pattern " + MASK_VALIDATOR.pattern());
        }

        networkAddressBytes = new byte[16];
        int pos = 0;
        StringTokenizer tokenizer = new StringTokenizer(matcher.group(1), ":");
        while (tokenizer.hasMoreTokens()) {
            String token = tokenizer.nextToken();
            int value = Integer.parseInt(token, 16);
            networkAddressBytes[pos++] = (byte) ((value & 0xff00) >> 8);
            networkAddressBytes[pos++] = (byte) value;
        }

        netmaskBytes = new byte[16];
        String netmask = matcher.group(4);
        if (null != netmask) {
            int value = Integer.parseInt(netmask);
            pos = value / 8;
            int shift = 8 - value % 8;
            for (int i = 0; i < pos; i++) {
                netmaskBytes[i] = (byte) 0xff;
            }
            netmaskBytes[pos] = (byte) (0xff << shift);
        } else {
            pos = 0;
            tokenizer = new StringTokenizer(matcher.group(5), ":");
            while (tokenizer.hasMoreTokens()) {
                String token = tokenizer.nextToken();
                int value = Integer.parseInt(token, 16);
                netmaskBytes[pos++] = (byte) ((value & 0xff00) >> 8);
                netmaskBytes[pos++] = (byte) value;
            }
        }
    }