public String getStringDataFilter() {
   return AnalysisHelper.getStringDataFilter(analysis);
 }
 /**
  * Method "setStringDataFilter".
  *
  * @param datafilterString
  * @return true when a new data filter is created, false if it is only updated
  */
 public boolean setStringDataFilter(String datafilterString) {
   return AnalysisHelper.setStringDataFilter(analysis, datafilterString);
 }