code: private void selectLogFile(List<Appender> appender, String filePath) {
  
          for (Appender app : appender) {
  
              String fileName = CmsLogFileApp.getFileName(app);
              if ((fileName != null) && fileName.equals(filePath)) {
                  m_logfile.select(fileName);
                  return;
              }
          }
          if (!appender.isEmpty()) {
              Appender app = appender.get(0);
              String fileName = CmsLogFileApp.getFileName(app);
              if (fileName != null) {
                  m_logfile.select(fileName); //Default, take file from root appender
              }
          }
      }
docs: Selects the currently set log file.<p>
  
  @param appender all given appender
  @param filePath of log file