private static void appendFullDigits()

in src/main/java/org/apache/commons/lang3/time/FastDatePrinter.java [705:769]
52 lines of code
15 McCabe index (conditional complexity)

    private static void appendFullDigits(final Appendable buffer, int value, int minFieldWidth) throws IOException {
        // specialized paths for 1 to 4 digits -> avoid the memory allocation from the temporary work array
        // see LANG-1248
        if (value < 10000) {
            // less memory allocation path works for four digits or less

            int nDigits = 4;
            if (value < 1000) {
                --nDigits;
                if (value < 100) {
                    --nDigits;
                    if (value < 10) {
                        --nDigits;
                    }
                }
            }
            // left zero pad
            for (int i = minFieldWidth - nDigits; i > 0; --i) {
                buffer.append('0');
            }

            switch (nDigits) {
            case 4:
                buffer.append((char) (value / 1000 + '0'));
                value %= 1000;
            case 3:
                if (value >= 100) {
                    buffer.append((char) (value / 100 + '0'));
                    value %= 100;
                } else {
                    buffer.append('0');
                }
            case 2:
                if (value >= 10) {
                    buffer.append((char) (value / 10 + '0'));
                    value %= 10;
                } else {
                    buffer.append('0');
                }
            case 1:
                buffer.append((char) (value + '0'));
            }
        } else {
            // more memory allocation path works for any digits

            // build up decimal representation in reverse
            final char[] work = new char[MAX_DIGITS];
            int digit = 0;
            while (value != 0) {
                work[digit++] = (char) (value % 10 + '0');
                value = value / 10;
            }

            // pad with zeros
            while (digit < minFieldWidth) {
                buffer.append('0');
                --minFieldWidth;
            }

            // reverse
            while (--digit >= 0) {
                buffer.append(work[digit]);
            }
        }
    }