/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.googlecode.perftrace.log4j.rewrite;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.Map;
import org.googlecode.perftrace.log4j.Logger;
import org.googlecode.perftrace.log4j.helpers.LogLog;
import org.googlecode.perftrace.log4j.spi.LoggingEvent;
/**
* This policy rewrites events by evaluating any
* JavaBean properties on the message object and adding them
* to the event properties. If the message object has a
* message property, the value of that property will be
* used as the message for the rewritten event and will
* not be added to the event properties. Values from the
* JavaBean properties will replace any existing property
* with the same name.
*
* The combination of the RewriteAppender and this policy
* performs the same actions as the ReflectionFilter from log4j 1.3.
*/
public class ReflectionRewritePolicy implements RewritePolicy {
/**
* {@inheritDoc}
*/
public LoggingEvent rewrite(final LoggingEvent source) {
Object msg = source.getMessage();
if (!(msg instanceof String)) {
Object newMsg = msg;
Map rewriteProps = new HashMap(source.getProperties());
try {
PropertyDescriptor[] props = Introspector.getBeanInfo(
msg.getClass(), Object.class).getPropertyDescriptors();
if (props.length > 0) {
for (int i=0;i<props.length;i++) {
try {
Object propertyValue =
props[i].getReadMethod().invoke(msg,
(Object[]) null);
if ("message".equalsIgnoreCase(props[i].getName())) {
newMsg = propertyValue;
} else {
rewriteProps.put(props[i].getName(), propertyValue);
}
} catch (Exception e) {
LogLog.warn("Unable to evaluate property " +
props[i].getName(), e);
}
}
return new LoggingEvent(
source.getFQNOfLoggerClass(),
source.getLogger() != null ? source.getLogger(): Logger.getLogger(source.getLoggerName()),
source.getTimeStamp(),
source.getLevel(),
newMsg,
source.getThreadName(),
source.getThrowableInformation(),
source.getNDC(),
source.getLocationInformation(),
rewriteProps);
}
} catch (Exception e) {
LogLog.warn("Unable to get property descriptors", e);
}
}
return source;
}
}