String className = subst(appenderElement.getAttribute(CLASS_ATTR));
LogLog.debug("Class name: [" + className+']');
try {
Object instance = Loader.loadClass(className).newInstance();
Appender appender = (Appender)instance;
PropertySetter propSetter = new PropertySetter(appender);
appender.setName(subst(appenderElement.getAttribute(NAME_ATTR)));
NodeList children = appenderElement.getChildNodes();
final int length = children.getLength();
for (int loop = 0; loop < length; loop++) {
Node currentNode = children.item(loop);
/* We're only interested in Elements */
if (currentNode.getNodeType() == Node.ELEMENT_NODE) {
Element currentElement = (Element)currentNode;
// Parse appender parameters
if (currentElement.getTagName().equals(PARAM_TAG)) {
setParameter(currentElement, propSetter);
}
// Set appender layout
else if (currentElement.getTagName().equals(LAYOUT_TAG)) {
appender.setLayout(parseLayout(currentElement));
}
// Add filters
else if (currentElement.getTagName().equals(FILTER_TAG)) {
parseFilters(currentElement, appender);
}
else if (currentElement.getTagName().equals(ERROR_HANDLER_TAG)) {
parseErrorHandler(currentElement, appender);
}
else if (currentElement.getTagName().equals(APPENDER_REF_TAG)) {
String refName = subst(currentElement.getAttribute(REF_ATTR));
if(appender instanceof AppenderAttachable) {
AppenderAttachable aa = (AppenderAttachable) appender;
LogLog.debug("Attaching appender named ["+ refName+
"] to appender named ["+ appender.getName()+"].");
aa.addAppender(findAppenderByReference(currentElement));
} else {
LogLog.error("Requesting attachment of appender named ["+
refName+ "] to appender named ["+ appender.getName()+
"] which does not implement org.apache.log4j.spi.AppenderAttachable.");
}
} else {
parseUnrecognizedElement(instance, currentElement, props);
}
}
}
propSetter.activate();
return appender;
}
/* Yes, it's ugly. But all of these exceptions point to the same
problem: we can't create an Appender */
catch (Exception oops) {