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Log4j implemented over SLF4J
There is a newer version: 2.1.0-alpha1
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.log4j;

import org.apache.log4j.spi.LoggerFactory;
import org.slf4j.spi.LocationAwareLogger;

/**
 * 
 * This class is a minimal implementation of the original
 * org.apache.log4j.Logger class (as found in log4j 1.2) 
 * delegating all calls to a {@link org.slf4j.Logger} instance.
 * 
 *
 * @author Ceki Gülcü 
 * */
@SuppressWarnings("rawtypes")
public class Logger extends Category {

    private static final String LOGGER_FQCN = Logger.class.getName();

    protected Logger(String name) {
        super(name);
    }

    public static Logger getLogger(String name) {
        return Log4jLoggerFactory.getLogger(name);
    }

    public static Logger getLogger(String name, LoggerFactory loggerFactory) {
        return Log4jLoggerFactory.getLogger(name, loggerFactory);
    }

    public static Logger getLogger(Class clazz) {
        return getLogger(clazz.getName());
    }

    /**
     * Does the obvious.
     * 
     * @return the root logger
     */
    public static Logger getRootLogger() {
        return Log4jLoggerFactory.getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
    }

    /**
     * Delegates to {@link org.slf4j.Logger#isTraceEnabled} 
     * method of SLF4J.
     * 
     * @return whether this logger is enabled for the level TRACE
     */
    public boolean isTraceEnabled() {
        return slf4jLogger.isTraceEnabled();
    }

    /**
     * Delegates to {@link org.slf4j.Logger#trace(String)} method in SLF4J.
     *     
     * @param message the message to log
     *      
     */
    public void trace(Object message) {
        differentiatedLog(null, LOGGER_FQCN, LocationAwareLogger.TRACE_INT, message, null);
    }

    /**
     * Delegates to {@link org.slf4j.Logger#trace(String,Throwable)} 
     * method in SLF4J.
     * 
     * @param message the message to log
     * @param t a Throwable to log
     */
    public void trace(Object message, Throwable t) {
        differentiatedLog(null, LOGGER_FQCN, LocationAwareLogger.TRACE_INT, message, t);
    }

}