DOMConfigurator.java 文件源码

/**
    Used internally to parse an {@link ErrorHandler} element.
  */
 protected
 void parseErrorHandler(Element element, Appender appender) {
   ErrorHandler eh = (ErrorHandler) OptionConverter.instantiateByClassName(
                                      subst(element.getAttribute(CLASS_ATTR)),
                                      org.apache.log4j.spi.ErrorHandler.class, 
                       null);

   if(eh != null) {
     eh.setAppender(appender);

     PropertySetter propSetter = new PropertySetter(eh);
     NodeList children = element.getChildNodes();
     final int length   = children.getLength();

     for (int loop = 0; loop < length; loop++) {
Node currentNode = children.item(loop);
if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
  Element currentElement = (Element) currentNode;
  String tagName = currentElement.getTagName();
  if(tagName.equals(PARAM_TAG)) {
           setParameter(currentElement, propSetter);
  } else if(tagName.equals(APPENDER_REF_TAG)) {
    eh.setBackupAppender(findAppenderByReference(currentElement));
  } else if(tagName.equals(LOGGER_REF)) {
    String loggerName = currentElement.getAttribute(REF_ATTR);      
    Logger logger = (catFactory == null) ? repository.getLogger(loggerName)
               : repository.getLogger(loggerName, catFactory);
    eh.setLogger(logger);
  } else if(tagName.equals(ROOT_REF)) {
    Logger root = repository.getRootLogger();
    eh.setLogger(root);
  } else {
         quietParseUnrecognizedElement(eh, currentElement, props);
     }
}
     }
     propSetter.activate();
     appender.setErrorHandler(eh);
   }
 }