org.apache.log4j.rewrite.ReflectionRewritePolicy Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of confluent-log4j Show documentation

A fork of Apache Log4j v1 with security patches, and repackaged as `io.confluent:confluent-log4j`

There is a newer version: 1.2.17-cp12

/*
 * 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