/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.log4j.joran.action;
import org.apache.joran.ExecutionContext;
import org.apache.joran.action.Action;
import org.apache.joran.helper.Option;
import org.apache.log4j.Appender;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.OptionConverter;
import org.apache.log4j.spi.ErrorItem;
import org.apache.log4j.spi.OptionHandler;
import org.xml.sax.Attributes;
import java.util.HashMap;
public class AppenderAction extends Action {
static final Logger logger = Logger.getLogger(AppenderAction.class);
Appender appender;
private boolean inError = false;
/**
* Instantiates an appender of the given class and sets its name.
*
* The appender thus generated is placed in the ExecutionContext appender bag.
*/
public void begin(
ExecutionContext ec, String localName, Attributes attributes) {
String className = attributes.getValue(CLASS_ATTRIBUTE);
try {
logger.debug(
"About to instantiate appender of type [" + className + "]");
Object instance =
OptionConverter.instantiateByClassName(
className, org.apache.log4j.Appender.class, null);
appender = (Appender) instance;
String appenderName = attributes.getValue(NAME_ATTRIBUTE);
if (Option.isEmpty(appenderName)) {
logger.warn(
"No appender name given for appender of type " + className + "].");
} else {
appender.setName(appenderName);
logger.debug("Appender named as [" + appenderName + "]");
}
// The execution context contains a bag which contains the appenders
// created thus far.
HashMap appenderBag =
(HashMap) ec.getObjectMap().get(ActionConst.APPENDER_BAG);
// add the appender just created to the appender bag.
appenderBag.put(appenderName, appender);
logger.debug("Pushing appender on to the object stack.");
ec.pushObject(appender);
} catch (Exception oops) {
inError = true;
logger.error(
"Could not create an Appender. Reported error follows.", oops);
ec.addError(
new ErrorItem(
"Could not create appender of type " + className + "]."));
}
}
/**
* Once the children elements are also parsed, now is the time to activate
* the appender options.
*/
public void end(ExecutionContext ec, String name) {
if (inError) {
return;
}
if (appender instanceof OptionHandler) {
((OptionHandler) appender).activateOptions();
}
Object o = ec.peekObject();
if (o != appender) {
logger.warn(
"The object at the of the stack is not the appender named ["
+ appender.getName() + "] pushed earlier.");
} else {
logger.debug(
"Popping appender named [" + appender.getName()
+ "] from the object stack");
ec.popObject();
}
}
public void finish(ExecutionContext ec) {
}
}