public StringBuffer format()

in log4j-1.2-api/src/main/java/org/apache/log4j/helpers/ISO8601DateFormat.java [56:163]
89 lines of code
21 McCabe index (conditional complexity)

    public StringBuffer format(final Date date, final StringBuffer sbuf, final FieldPosition fieldPosition) {

        final long now = date.getTime();
        final int millis = (int) (now % 1000);

        if ((now - millis) != lastTime || lastTimeString[0] == 0) {
            // We reach this point at most once per second
            // across all threads instead of each time format()
            // is called. This saves considerable CPU time.

            calendar.setTime(date);

            final int start = sbuf.length();

            final int year = calendar.get(Calendar.YEAR);
            sbuf.append(year);

            String month;
            switch (calendar.get(Calendar.MONTH)) {
            case Calendar.JANUARY:
                month = "-01-";
                break;
            case Calendar.FEBRUARY:
                month = "-02-";
                break;
            case Calendar.MARCH:
                month = "-03-";
                break;
            case Calendar.APRIL:
                month = "-04-";
                break;
            case Calendar.MAY:
                month = "-05-";
                break;
            case Calendar.JUNE:
                month = "-06-";
                break;
            case Calendar.JULY:
                month = "-07-";
                break;
            case Calendar.AUGUST:
                month = "-08-";
                break;
            case Calendar.SEPTEMBER:
                month = "-09-";
                break;
            case Calendar.OCTOBER:
                month = "-10-";
                break;
            case Calendar.NOVEMBER:
                month = "-11-";
                break;
            case Calendar.DECEMBER:
                month = "-12-";
                break;
            default:
                month = "-NA-";
                break;
            }
            sbuf.append(month);

            final int day = calendar.get(Calendar.DAY_OF_MONTH);
            if (day < 10) {
                sbuf.append('0');
            }
            sbuf.append(day);

            sbuf.append(' ');

            final int hour = calendar.get(Calendar.HOUR_OF_DAY);
            if (hour < 10) {
                sbuf.append('0');
            }
            sbuf.append(hour);
            sbuf.append(':');

            final int mins = calendar.get(Calendar.MINUTE);
            if (mins < 10) {
                sbuf.append('0');
            }
            sbuf.append(mins);
            sbuf.append(':');

            final int secs = calendar.get(Calendar.SECOND);
            if (secs < 10) {
                sbuf.append('0');
            }
            sbuf.append(secs);

            sbuf.append(',');

            // store the time string for next time to avoid recomputation
            sbuf.getChars(start, sbuf.length(), lastTimeString, 0);
            lastTime = now - millis;
        } else {
            sbuf.append(lastTimeString);
        }

        if (millis < 100) {
            sbuf.append('0');
        }
        if (millis < 10) {
            sbuf.append('0');
        }

        sbuf.append(millis);
        return sbuf;
    }