private static void validatePathName()

in stream/distributedlog/core/src/main/java/org/apache/distributedlog/util/DLUtils.java [301:364]
57 lines of code
31 McCabe index (conditional complexity)

    private static void validatePathName(String logName) throws InvalidStreamNameException {
        if (logName == null) {
            throw new InvalidStreamNameException("Log name cannot be null");
        } else if (logName.length() == 0) {
            throw new InvalidStreamNameException("Log name length must be > 0");
        } else if (logName.charAt(0) != '/') {
            throw new InvalidStreamNameException("Log name must start with / character");
        } else if (logName.length() != 1) {
            if (logName.charAt(logName.length() - 1) == '/') {
                throw new InvalidStreamNameException("Log name must not end with / character");
            } else {
                String reason = null;
                char lastc = '/';
                char[] chars = logName.toCharArray();

                for (int i = 1; i < chars.length; ++i) {
                    char c = chars[i];
                    if (c == 0) {
                        reason = "null character not allowed @" + i;
                        break;
                    }

                    if (c == '<' || c == '>') {
                        reason = "< or > specified @" + i;
                        break;
                    }

                    if (c == ' ') {
                        reason = "empty space specified @" + i;
                        break;
                    }

                    if (c == '/' && lastc == '/') {
                        reason = "empty node name specified @" + i;
                        break;
                    }

                    if (c == '.' && lastc == '.') {
                        if (chars[i - 2] == '/' && (i + 1 == chars.length || chars[i + 1] == '/')) {
                            reason = "relative paths not allowed @" + i;
                            break;
                        }
                    } else if (c == '.') {
                        if (chars[i - 1] == '/' && (i + 1 == chars.length || chars[i + 1] == '/')) {
                            reason = "relative paths not allowed @" + i;
                            break;
                        }
                    } else if (c > '\u0000' && c < '\u001f'
                        || c > '\u007f' && c < '\u009F'
                        || c > '\ud800' && c < '\uf8ff'
                        || c > '\ufff0' && c < '\uffff') {
                        reason = "invalid character @" + i;
                        break;
                    }
                    lastc = chars[i];
                }

                if (reason != null) {
                    throw new InvalidStreamNameException("Invalid log name \"" + logName + "\" caused by " + reason);
                }
            }
        }

    }