1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package org.apache.log4j.pattern; 19 20 import org.apache.log4j.spi.LoggingEvent; 21 22 23 /** 24 * Formats a logger name. 25 * 26 * @author Ceki Gülcü 27 * 28 */ 29 public final class LoggerPatternConverter extends NamePatternConverter { 30 /** 31 * Singleton. 32 */ 33 private static final LoggerPatternConverter INSTANCE = 34 new LoggerPatternConverter(null); 35 36 /** 37 * Private constructor. 38 * @param options options, may be null. 39 */ 40 private LoggerPatternConverter(final String[] options) { 41 super("Logger", "logger", options); 42 } 43 44 /** 45 * Obtains an instance of pattern converter. 46 * @param options options, may be null. 47 * @return instance of pattern converter. 48 */ 49 public static LoggerPatternConverter newInstance( 50 final String[] options) { 51 if ((options == null) || (options.length == 0)) { 52 return INSTANCE; 53 } 54 55 return new LoggerPatternConverter(options); 56 } 57 58 /** 59 * {@inheritDoc} 60 */ 61 public void format(final LoggingEvent event, final StringBuffer toAppendTo) { 62 final int initialLength = toAppendTo.length(); 63 toAppendTo.append(event.getLoggerName()); 64 abbreviate(initialLength, toAppendTo); 65 } 66 }