1 /* 2 * Copyright 2001-2004 The Apache Software Foundation. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package org.apache.log4j; 18 19 import java.util.Hashtable; 20 21 /** 22 * This class is a factory that creates and maintains org.apache.log4j.Loggers 23 * warpping org.slf4j.Loggers. 24 * 25 * It keeps a hashtable of all created org.apache.log4j.Logger instances so that 26 * all newly created instances are not dulpicates of existing loggers. 27 * 28 * @author Sébastien Pennec 29 */ 30 class Log4jLoggerFactory { 31 32 // String, Logger 33 private static Hashtable log4jLoggers = new Hashtable(); 34 35 public static synchronized Logger getLogger(String name) { 36 if (log4jLoggers.containsKey(name)) { 37 return (org.apache.log4j.Logger) log4jLoggers.get(name); 38 } else { 39 Logger log4jLogger = new Logger(name); 40 41 log4jLoggers.put(name, log4jLogger); 42 return log4jLogger; 43 } 44 } 45 46 }