code: @Override
      public Enumeration getAllAppenders() {
          if (appenderList == null)
              return null;
          else {
              Iterator<Appender> it = appenderList.iterator();
              return new IteratorEnumeration(it);
          }
      }
docs: /*
  (non-Javadoc)
  
  @see org.apache.log4j.helpers.AppenderAttachableImpl#getAllAppenders()