public static boolean isValidIPV4Address()

in resolver/src/main/java/org/apache/james/jspf/core/Inet6Util.java [395:430]

• 33 lines of code
• 12 McCabe index (conditional complexity)

    public static boolean isValidIPV4Address(String value) {

        int periods = 0;
        int i = 0;
        int length = value.length();

        if (length > 15)
            return false;
        char c = 0;
        String word = "";
        for (i = 0; i < length; i++) {
            c = value.charAt(i);
            if (c == '.') {
                periods++;
                if (periods > 3)
                    return false;
                if (word == "")
                    return false;
                if (Integer.parseInt(word) > 255)
                    return false;
                word = "";
            } else if (!(Character.isDigit(c)))
                return false;
            else {
                if (word.length() > 2)
                    return false;
                word += c;
            }
        }

        if (word == "" || Integer.parseInt(word) > 255)
            return false;
        if (periods != 3)
            return false;
        return true;
    }