code: public String next() {
      seq++;
      String text = pattern;
      for (final Integer paramLevel : params) {
        text = Strings.replace(text, "{" + paramLevel + "}", generator.getSytle(paramLevel.intValue())
            .curSeqText());
      }
      return Strings.replace(text, "{" + level + "}", seqNumStyle.build(seq));
    }
docs: <p>
  next.
  </p>
  
  @return a {@link java.lang.String} object.