code: public void build(Keyset keyset)
      {
          if (keyset.hasValues())
          {
              DawgBuilder dawgBuilder = new DawgBuilder();
              buildDawg(keyset, dawgBuilder);
              buildFromDawg(dawgBuilder);
              dawgBuilder.clear();
          }
          else
          {
              buildFromKeyset(keyset);
          }
      }
docs: 构建
  @param keyset