docs: public void getBaseDataClass(FieldStuff fieldStuff)
      {
          Record recClassInfo2 = m_recClassInfo2;
          FieldData recFieldData = (FieldData)this.getRecord(FieldData.FIELD_DATA_FILE);
          
          String strRecordClass = recFieldData.getField(FieldData.FIELD_CLASS).getString();
          fieldStuff.strBaseFieldClass = null;
          try   {
              while (true)
              {
                  recClassInfo2.setKeyArea(ClassInfo.CLASS_NAME_KEY);
                  recClassInfo2.getField(ClassInfo.CLASS_NAME).setString(strRecordClass);   // Class of this record
                  if ((!recClassInfo2.seek("=")) || (strRecordClass == null) || (strRecordClass.length() == 0))
                  {
                      if (fieldStuff.strBaseFieldClass == null)
                          fieldStuff.strBaseFieldClass = recFieldData.getField(FieldData.FIELD_CLASS).getString();   // Never
                      return;
                  }
                  if (fieldStuff.strBaseFieldClass == null)
                  {
                  	String packageName = ((ClassInfo)recClassInfo2).getPackageName(null);
                      if (packageName.endsWith(".base.field"))
                          fieldStuff.strBaseFieldClass = recClassInfo2.getField(ClassInfo.CLASS_NAME).toString();
                  }
                  if (strRecordClass.indexOf("Field") != -1)
                  {
                      String strType = strRecordClass.substring(0, strRecordClass.indexOf("Field"));
                      if ((strType.equals("DateTime")) || (strType.equals("Time")))
                          strType = "Date";
                      if (strType.length() > 0)
                          if ("Short Integer Double Float Boolean String Date".indexOf(strType) != -1)
                      {
                          if ((fieldStuff.strDataClass == null) || (fieldStuff.strDataClass.length() == 0))
                              fieldStuff.strDataClass = strType;      // End of based records - not found
                          return;
                      }
                  }
                  strRecordClass = recClassInfo2.getField(ClassInfo.BASE_CLASS_NAME).getString();
              }
          } catch (DBException ex)    {
              ex.printStackTrace();
          }
      }