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flexmark-java format utility classes

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package com.vladsch.flexmark.util.format;

public enum NumberFormat {
  NONE,
  ARABIC,
  LETTERS,
  ROMAN,
  CUSTOM,
  ;

  public static String getFormat(NumberFormat format, int count) {
    switch (format) {
      case NONE:
        return "";
      case ARABIC:
        return String.valueOf(count);
      case LETTERS:
        if (count < 1)
          throw new NumberFormatException("Letter format count must be > 0, actual " + count);
        return getFormat(count - 1, "abcdefghijklmnopqrstuvwxyz");
      case ROMAN:
        return new RomanNumeral(count).toString();
      case CUSTOM:
        throw new IllegalStateException(
            "CounterFormat.CUSTOM has to use custom conversion, possibly by calling getFormat(int count, CharSequence digitSet)");
    }
    return "";
  }

  public static String getFormat(int count, CharSequence digitSet) {
    StringBuilder sb = new StringBuilder(10);
    int base = digitSet.length();
    do {
      int next = count / base;
      int dig = count - next * base;
      sb.append(digitSet.charAt(dig));
      count = next;
    } while (count > 0);

    int iMax = sb.length();
    StringBuilder out = new StringBuilder(iMax);
    for (int i = iMax; i-- > 0; ) {
      out.append(sb.charAt(i));
    }

    return out.toString();
  }
}