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 package org.slf4j.impl; 018 019 import org.slf4j.ILoggerFactory; 020 import org.slf4j.helpers.Log4JLoggerFactory; 021 import org.slf4j.spi.LoggerFactoryBinder; 022 023 /** 024 * 025 */ 026 public final class StaticLoggerBinder implements LoggerFactoryBinder { 027 028 /** 029 * Declare the version of the SLF4J API this implementation is compiled 030 * against. The value of this field is usually modified with each release. 031 */ 032 // to avoid constant folding by the compiler, this field must *not* be final 033 public static String REQUESTED_API_VERSION = "1.6"; // !final 034 035 private static final String LOGGER_FACTORY_CLASS_STR = Log4JLoggerFactory.class.getName(); 036 037 /** 038 * The unique instance of this class. 039 */ 040 private static final StaticLoggerBinder SINGLETON = new StaticLoggerBinder(); 041 042 /** 043 * The ILoggerFactory instance returned by the {@link #getLoggerFactory} 044 * method should always be the same object 045 */ 046 private final ILoggerFactory loggerFactory; 047 048 /** 049 * Private constructor to prevent instantiation 050 */ 051 private StaticLoggerBinder() { 052 loggerFactory = new Log4JLoggerFactory(); 053 } 054 055 /** 056 * Return the singleton of this class. 057 * 058 * @return the StaticLoggerBinder singleton 059 */ 060 public static StaticLoggerBinder getSingleton() { 061 return SINGLETON; 062 } 063 064 /** 065 * Return the factory. 066 * @return the factor. 067 */ 068 public ILoggerFactory getLoggerFactory() { 069 return loggerFactory; 070 } 071 072 /** 073 * Return the class name. 074 * @return the class name; 075 */ 076 public String getLoggerFactoryClassStr() { 077 return LOGGER_FACTORY_CLASS_STR; 078 } 079 }