public static Integer parseTime()

in paimon-common/src/main/java/org/apache/paimon/utils/DateTimeUtils.java [253:342]
88 lines of code
16 McCabe index (conditional complexity)

    public static Integer parseTime(String v) {
        final int start = 0;
        final int colon1 = v.indexOf(':', start);
        // timezone hh:mm:ss[.ssssss][[+|-]hh:mm:ss]
        // refer https://www.w3.org/TR/NOTE-datetime
        int timezoneHour;
        int timezoneMinute;
        int hour;
        int minute;
        int second;
        int milli;
        int operator = -1;
        int end = v.length();
        int timezone = v.indexOf('-', start);
        if (timezone < 0) {
            timezone = v.indexOf('+', start);
            operator = 1;
        }
        if (timezone < 0) {
            timezoneHour = 0;
            timezoneMinute = 0;
        } else {
            end = timezone;
            final int colon3 = v.indexOf(':', timezone);
            if (colon3 < 0) {
                if (!isInteger(v.substring(timezone + 1).trim())) {
                    return null;
                }
                timezoneHour = Integer.parseInt(v.substring(timezone + 1).trim());
                timezoneMinute = 0;
            } else {
                if (!isInteger(v.substring(timezone + 1, colon3).trim())) {
                    return null;
                }
                timezoneHour = Integer.parseInt(v.substring(timezone + 1, colon3).trim());
                if (!isInteger(v.substring(colon3 + 1).trim())) {
                    return null;
                }
                timezoneMinute = Integer.parseInt(v.substring(colon3 + 1).trim());
            }
        }
        if (colon1 < 0) {
            if (!isInteger(v.substring(start, end).trim())) {
                return null;
            }
            hour = Integer.parseInt(v.substring(start, end).trim());
            minute = 0;
            second = 0;
            milli = 0;
        } else {
            if (!isInteger(v.substring(start, colon1).trim())) {
                return null;
            }
            hour = Integer.parseInt(v.substring(start, colon1).trim());
            final int colon2 = v.indexOf(':', colon1 + 1);
            if (colon2 < 0) {
                if (!isInteger(v.substring(colon1 + 1, end).trim())) {
                    return null;
                }
                minute = Integer.parseInt(v.substring(colon1 + 1, end).trim());
                second = 0;
                milli = 0;
            } else {
                if (!isInteger(v.substring(colon1 + 1, colon2).trim())) {
                    return null;
                }
                minute = Integer.parseInt(v.substring(colon1 + 1, colon2).trim());
                int dot = v.indexOf('.', colon2);
                if (dot < 0) {
                    if (!isInteger(v.substring(colon2 + 1, end).trim())) {
                        return null;
                    }
                    second = Integer.parseInt(v.substring(colon2 + 1, end).trim());
                    milli = 0;
                } else {
                    if (!isInteger(v.substring(colon2 + 1, dot).trim())) {
                        return null;
                    }
                    second = Integer.parseInt(v.substring(colon2 + 1, dot).trim());
                    milli = parseFraction(v.substring(dot + 1, end).trim());
                }
            }
        }
        hour += operator * timezoneHour;
        minute += operator * timezoneMinute;
        return hour * (int) MILLIS_PER_HOUR
                + minute * (int) MILLIS_PER_MINUTE
                + second * (int) MILLIS_PER_SECOND
                + milli;
    }