/*
* 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.log4j.Appender;
import org.apache.log4j.Layout;
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;
public class LayoutAction extends Action {
static final Logger logger = Logger.getLogger(LayoutAction.class);
Layout layout;
boolean inError = false;
/**
* Instantiates an layout of the given class and sets its name.
*
*/
public void begin(ExecutionContext ec, String name, Attributes attributes) {
// Let us forget about previous errors (in this object)
inError = false;
String className =
attributes.getValue(CLASS_ATTRIBUTE);
try {
logger.debug("About to instantiate layout of type [" + className + "]");
Object instance =
OptionConverter.instantiateByClassName(
className, org.apache.log4j.Layout.class, null);
layout = (Layout) instance;
logger.debug("Pushing layout on top of the object stack.");
ec.pushObject(layout);
} catch (Exception oops) {
inError = true;
logger.error(
"Could not create an Layout. Reported error follows.", oops);
ec.addError(new ErrorItem("Could not create layout 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 e) {
if (inError) {
return;
}
if (layout instanceof OptionHandler) {
((OptionHandler) layout).activateOptions();
}
Object o = ec.peekObject();
if (o != layout) {
logger.warn(
"The object on the top the of the stack is not the layout pushed earlier.");
} else {
logger.debug("Popping layout from the object stack");
ec.popObject();
try {
logger.debug("About to set the layout of the containing appender.");
Appender appender = (Appender) ec.peekObject();
appender.setLayout(layout);
} catch(Exception ex) {
logger.error("Could not set the layout for containing appender.", ex);
}
}
}
public void finish(ExecutionContext ec) {
}
}