org.apache.log4j.rewrite.PropertyRewritePolicy 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.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.StringTokenizer;
import org.apache.log4j.Logger;
import org.apache.log4j.spi.LoggingEvent;
/**
* This policy rewrites events by adding
* a user-specified list of properties to the event.
* Existing properties are not modified.
*
* The combination of the RewriteAppender and this policy
* performs the same actions as the PropertyFilter from log4j 1.3.
*/
public class PropertyRewritePolicy implements RewritePolicy {
private Map properties = Collections.EMPTY_MAP;
public PropertyRewritePolicy() {
}
/**
* Set a string representing the property name/value pairs.
*
* Form: propname1=propvalue1,propname2=propvalue2
*
* @param props
*/
public void setProperties(String props) {
Map hashTable = new HashMap();
StringTokenizer pairs = new StringTokenizer(props, ",");
while (pairs.hasMoreTokens()) {
StringTokenizer entry = new StringTokenizer(pairs.nextToken(), "=");
hashTable.put(entry.nextElement().toString().trim(), entry.nextElement().toString().trim());
}
synchronized(this) {
properties = hashTable;
}
}
/**
* {@inheritDoc}
*/
public LoggingEvent rewrite(final LoggingEvent source) {
if (!properties.isEmpty()) {
Map rewriteProps = new HashMap(source.getProperties());
for(Iterator iter = properties.entrySet().iterator();
iter.hasNext();
) {
Map.Entry entry = (Map.Entry) iter.next();
if (!rewriteProps.containsKey(entry.getKey())) {
rewriteProps.put(entry.getKey(), entry.getValue());
}
}
return new LoggingEvent(
source.getFQNOfLoggerClass(),
source.getLogger() != null ? source.getLogger(): Logger.getLogger(source.getLoggerName()),
source.getTimeStamp(),
source.getLevel(),
source.getMessage(),
source.getThreadName(),
source.getThrowableInformation(),
source.getNDC(),
source.getLocationInformation(),
rewriteProps);
}
return source;
}
}