/*
* Copyright 2012 Netflix, Inc.
*
* 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 com.netflix.logging.log4jAdapter;
import java.util.Arrays;
import java.util.List;
import org.apache.log4j.helpers.FormattingInfo;
import org.apache.log4j.helpers.PatternConverter;
import org.apache.log4j.helpers.PatternParser;
import org.apache.log4j.spi.LocationInfo;
import org.apache.log4j.spi.LoggingEvent;
import com.netflix.blitz4j.LoggingContext;
/**
* A custom parser class that provides a better performing implementation than the one in log4j for finding location information such
* as class, line number etc.
*
* @author Karthik Ranganathan
*
*/
public class NFPatternParser extends PatternParser {
private static List<Character> contextCharList = Arrays.asList(Character.valueOf('c'),
Character.valueOf('l'),
Character.valueOf('M'),
Character.valueOf('C'),
Character.valueOf('L'),
Character.valueOf('F'));
public NFPatternParser(String pattern) {
super(pattern);
}
protected void finalizeConverter(char c) {
if (contextCharList.contains(Character.valueOf(c))) {
PatternConverter pc = new NFPatternConverter(formattingInfo, c);
addConverter(pc);
currentLiteral.setLength(0);
} else {
super.finalizeConverter(c);
}
}
private static class NFPatternConverter extends PatternConverter {
private char type;
NFPatternConverter(FormattingInfo formattingInfo, char type) {
super(formattingInfo);
this.type = type;
}
@Override
public String convert(LoggingEvent event) {
LocationInfo locationInfo = LoggingContext.getInstance().getLocationInfo(event);
if (locationInfo == null) {
return "";
}
switch (type) {
case 'M':
return locationInfo.getMethodName();
case 'c':
return event.getLoggerName();
case 'C':
return locationInfo.getClassName();
case 'L':
return locationInfo.getLineNumber();
case 'l':
return (locationInfo.getFileName() + ":"
+ locationInfo.getClassName() + " "
+ locationInfo.getLineNumber() + " " + locationInfo
.getMethodName());
case 'F':
return locationInfo.getFileName();
}
return "";
}
}
}