001package org.eclipse.aether.internal.impl.slf4j; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import javax.inject.Inject; 023import javax.inject.Named; 024 025import org.eclipse.aether.spi.locator.Service; 026import org.eclipse.aether.spi.locator.ServiceLocator; 027import org.eclipse.aether.spi.log.Logger; 028import org.eclipse.aether.spi.log.LoggerFactory; 029import org.eclipse.sisu.Nullable; 030import org.slf4j.ILoggerFactory; 031import org.slf4j.spi.LocationAwareLogger; 032 033/** 034 * A logger factory that delegates to <a href="http://www.slf4j.org/" target="_blank">SLF4J</a> logging. 035 */ 036@Named( "slf4j" ) 037public class Slf4jLoggerFactory 038 implements LoggerFactory, Service 039{ 040 041 private static final boolean AVAILABLE; 042 043 static 044 { 045 boolean available; 046 try 047 { 048 Slf4jLoggerFactory.class.getClassLoader().loadClass( "org.slf4j.ILoggerFactory" ); 049 available = true; 050 } 051 catch ( Exception | LinkageError e ) 052 { 053 available = false; 054 } 055 AVAILABLE = available; 056 } 057 058 public static boolean isSlf4jAvailable() 059 { 060 return AVAILABLE; 061 } 062 063 private ILoggerFactory factory; 064 065 /** 066 * Creates an instance of this logger factory. 067 */ 068 public Slf4jLoggerFactory() 069 { 070 // enables no-arg constructor 071 } 072 073 @Inject 074 Slf4jLoggerFactory( @Nullable ILoggerFactory factory ) 075 { 076 setLoggerFactory( factory ); 077 } 078 079 public void initService( ServiceLocator locator ) 080 { 081 setLoggerFactory( locator.getService( ILoggerFactory.class ) ); 082 } 083 084 public Slf4jLoggerFactory setLoggerFactory( ILoggerFactory factory ) 085 { 086 this.factory = factory; 087 return this; 088 } 089 090 public Logger getLogger( String name ) 091 { 092 org.slf4j.Logger logger = getFactory().getLogger( name ); 093 if ( logger instanceof LocationAwareLogger ) 094 { 095 return new Slf4jLoggerEx( (LocationAwareLogger) logger ); 096 } 097 return new Slf4jLogger( logger ); 098 } 099 100 private ILoggerFactory getFactory() 101 { 102 if ( factory == null ) 103 { 104 factory = org.slf4j.LoggerFactory.getILoggerFactory(); 105 } 106 return factory; 107 } 108 109 private static final class Slf4jLogger 110 implements Logger 111 { 112 113 private final org.slf4j.Logger logger; 114 115 Slf4jLogger( org.slf4j.Logger logger ) 116 { 117 this.logger = logger; 118 } 119 120 public boolean isDebugEnabled() 121 { 122 return logger.isDebugEnabled(); 123 } 124 125 public void debug( String msg ) 126 { 127 logger.debug( msg ); 128 } 129 130 public void debug( String msg, Throwable error ) 131 { 132 logger.debug( msg, error ); 133 } 134 135 public boolean isWarnEnabled() 136 { 137 return logger.isWarnEnabled(); 138 } 139 140 public void warn( String msg ) 141 { 142 logger.warn( msg ); 143 } 144 145 public void warn( String msg, Throwable error ) 146 { 147 logger.warn( msg, error ); 148 } 149 150 } 151 152 private static final class Slf4jLoggerEx 153 implements Logger 154 { 155 156 private static final String FQCN = Slf4jLoggerEx.class.getName(); 157 158 private final LocationAwareLogger logger; 159 160 Slf4jLoggerEx( LocationAwareLogger logger ) 161 { 162 this.logger = logger; 163 } 164 165 public boolean isDebugEnabled() 166 { 167 return logger.isDebugEnabled(); 168 } 169 170 public void debug( String msg ) 171 { 172 logger.log( null, FQCN, LocationAwareLogger.DEBUG_INT, msg, null, null ); 173 } 174 175 public void debug( String msg, Throwable error ) 176 { 177 logger.log( null, FQCN, LocationAwareLogger.DEBUG_INT, msg, null, error ); 178 } 179 180 public boolean isWarnEnabled() 181 { 182 return logger.isWarnEnabled(); 183 } 184 185 public void warn( String msg ) 186 { 187 logger.log( null, FQCN, LocationAwareLogger.WARN_INT, msg, null, null ); 188 } 189 190 public void warn( String msg, Throwable error ) 191 { 192 logger.log( null, FQCN, LocationAwareLogger.WARN_INT, msg, null, error ); 193 } 194 195 } 196 197}