001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.log4j.pattern; 019 020import org.apache.log4j.spi.LoggingEvent; 021 022 023/** 024 * Formats a logger name. 025 * 026 * @author Ceki Gülcü 027 * 028 */ 029public final class LoggerPatternConverter extends NamePatternConverter { 030 /** 031 * Singleton. 032 */ 033 private static final LoggerPatternConverter INSTANCE = 034 new LoggerPatternConverter(null); 035 036 /** 037 * Private constructor. 038 * @param options options, may be null. 039 */ 040 private LoggerPatternConverter(final String[] options) { 041 super("Logger", "logger", options); 042 } 043 044 /** 045 * Obtains an instance of pattern converter. 046 * @param options options, may be null. 047 * @return instance of pattern converter. 048 */ 049 public static LoggerPatternConverter newInstance( 050 final String[] options) { 051 if ((options == null) || (options.length == 0)) { 052 return INSTANCE; 053 } 054 055 return new LoggerPatternConverter(options); 056 } 057 058 /** 059 * {@inheritDoc} 060 */ 061 public void format(final LoggingEvent event, final StringBuffer toAppendTo) { 062 final int initialLength = toAppendTo.length(); 063 toAppendTo.append(event.getLoggerName()); 064 abbreviate(initialLength, toAppendTo); 065 } 066}