@Override
      public boolean process(String name, Object value) {
        count ++;
        if (count == 2) builder.insert(prevOffset, prevName +"=");
        if (count > 1) builder.append(", ");
        prevOffset = builder.length();
        if (count > 1) builder.append(name).append("=");
        appendValue(builder, indent, value);
        prevName = name;
        return true;
      }
@Override
      public boolean process(String name, Object value)