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.LocationInfo; 021import org.apache.log4j.spi.LoggingEvent; 022 023 024/** 025 * Return the event's line location information in a StringBuffer. 026 * 027 * @author Ceki Gülcü 028 */ 029public final class LineLocationPatternConverter 030 extends LoggingEventPatternConverter { 031 /** 032 * Singleton. 033 */ 034 private static final LineLocationPatternConverter INSTANCE = 035 new LineLocationPatternConverter(); 036 037 /** 038 * Private constructor. 039 */ 040 private LineLocationPatternConverter() { 041 super("Line", "line"); 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 LineLocationPatternConverter newInstance( 050 final String[] options) { 051 return INSTANCE; 052 } 053 054 /** 055 * {@inheritDoc} 056 */ 057 public void format(final LoggingEvent event, final StringBuffer output) { 058 LocationInfo locationInfo = event.getLocationInformation(); 059 060 if (locationInfo != null) { 061 output.append(locationInfo.getLineNumber()); 062 } 063 } 064}