org.apache.log4j.rewrite.ReflectionRewritePolicy Maven / Gradle / Ivy
/*
* 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.apache.log4j.rewrite;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.util.HashMap;
import java.util.Map;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.LogLog;
import org.apache.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;
}
}