java - How to control parsing xml using xStream? -

now using xstream parse object xml-format string. hope when parse xml can want according different fileds, if encounter filed a, add cdata block before it, when encounter filed b, make upper case, this, , here doing now.

public static string textmessagetoxml(responsetextmessage textmsg){     xstream.alias("xml", textmsg.getclass());     return xstream.toxml(textmsg); }    private static xstream xstream = new xstream(new xppdriver() {         @override         public hierarchicalstreamwriter createwriter(writer out) {               return new prettyprintwriter(out) {                   // add cdata block                   boolean cdata = ...;//i need add cdata fields                   boolean isneedupper=...;//only need                  protected void writetext(quickwriter writer, string text) {                       if (cdata) {                           writer.write("<![cdata[");                           writer.write(text);                           writer.write("]]>");                       } else if (isneedupper){                           writer.write(text.touppercase());                       }                       else writer.write(text);                 }               };           }       });