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    }