/* * 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.commons.logging.impl;import java.io.Serializable;import org.apache.commons.logging.Log;import org.apache.log4j.Logger;import org.apache.log4j.Priority;import org.apache.log4j.Level;/** * <p>Implementation of {@link Log} that maps directly to a Log4J * <strong>Logger</strong>.  Initial configuration of the corresponding * Logger instances should be done in the usual manner, as outlined in * the Log4J documentation.</p> * * @author <a href="mailto:sanders@apache.org">Scott Sanders</a> * @author Rod Waldhoff * @author Robert Burrell Donkin * @version $Id: Log4JLogger.java,v 1.11 2004/05/19 21:01:23 rdonkin Exp $ */public class Log4JLogger implements Log, Serializable {    // ------------------------------------------------------------- Attributes    /** The fully qualified name of the Log4JLogger class. */    private static final String FQCN = Log4JLogger.class.getName();        private static final boolean is12 = Priority.class.isAssignableFrom(Level.class);    /** Log to this logger */    private transient Logger logger = null;    /** Logger name */    private String name = null;    // ------------------------------------------------------------ Constructor    public Log4JLogger() {    }    /**     * Base constructor.     */    public Log4JLogger(String name) {        this.name = name;        this.logger = getLogger();    }    /** For use with a log4j factory.     */    public Log4JLogger(Logger logger ) {        this.name = logger.getName();        this.logger=logger;    }    // --------------------------------------------------------- Implementation    /**     * Log a message to the Log4j Logger with <code>TRACE</code> priority.     * Currently logs to <code>DEBUG</code> level in Log4J.     */    public void trace(Object message) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.DEBUG, message, null );        } else {            getLogger().log(FQCN, Level.DEBUG, message, null );        }    }    /**     * Log an error to the Log4j Logger with <code>TRACE</code> priority.     * Currently logs to <code>DEBUG</code> level in Log4J.     */    public void trace(Object message, Throwable t) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.DEBUG, message, t );        } else {            getLogger().log(FQCN, Level.DEBUG, message, t );        }    }    /**     * Log a message to the Log4j Logger with <code>DEBUG</code> priority.     */    public void debug(Object message) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.DEBUG, message, null );        } else {            getLogger().log(FQCN, Level.DEBUG, message, null );        }    }    /**     * Log an error to the Log4j Logger with <code>DEBUG</code> priority.     */    public void debug(Object message, Throwable t) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.DEBUG, message, t );        } else {            getLogger().log(FQCN, Level.DEBUG, message, t );        }    }    /**     * Log a message to the Log4j Logger with <code>INFO</code> priority.     */    public void info(Object message) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.INFO, message, null );        } else {            getLogger().log(FQCN, Level.INFO, message, null );        }        }    /**     * Log an error to the Log4j Logger with <code>INFO</code> priority.     */    public void info(Object message, Throwable t) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.INFO, message, t );        } else {            getLogger().log(FQCN, Level.INFO, message, t );        }    }    /**     * Log a message to the Log4j Logger with <code>WARN</code> priority.     */    public void warn(Object message) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.WARN, message, null );        } else {            getLogger().log(FQCN, Level.WARN, message, null );        }    }    /**     * Log an error to the Log4j Logger with <code>WARN</code> priority.     */    public void warn(Object message, Throwable t) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.WARN, message, t );        } else {            getLogger().log(FQCN, Level.WARN, message, t );        }    }    /**     * Log a message to the Log4j Logger with <code>ERROR</code> priority.     */    public void error(Object message) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.ERROR, message, null );        } else {            getLogger().log(FQCN, Level.ERROR, message, null );        }    }    /**     * Log an error to the Log4j Logger with <code>ERROR</code> priority.     */    public void error(Object message, Throwable t) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.ERROR, message, t );        } else {            getLogger().log(FQCN, Level.ERROR, message, t );        }    }    /**     * Log a message to the Log4j Logger with <code>FATAL</code> priority.     */    public void fatal(Object message) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.FATAL, message, null );        } else {            getLogger().log(FQCN, Level.FATAL, message, null );        }    }    /**     * Log an error to the Log4j Logger with <code>FATAL</code> priority.     */    public void fatal(Object message, Throwable t) {        if(is12) {            getLogger().log(FQCN, (Priority) Level.FATAL, message, t );        } else {            getLogger().log(FQCN, Level.FATAL, message, t );        }    }    /**     * Return the native Logger instance we are using.     */    public Logger getLogger() {        if (logger == null) {            logger = Logger.getLogger(name);        }        return (this.logger);    }    /**     * Check whether the Log4j Logger used is enabled for <code>DEBUG</code> priority.     */    public boolean isDebugEnabled() {        return getLogger().isDebugEnabled();    }     /**     * Check whether the Log4j Logger used is enabled for <code>ERROR</code> priority.     */    public boolean isErrorEnabled() {        if(is12) {            return getLogger().isEnabledFor((Priority) Level.ERROR);        } else {            return getLogger().isEnabledFor(Level.ERROR);        }    }    /**     * Check whether the Log4j Logger used is enabled for <code>FATAL</code> priority.     */    public boolean isFatalEnabled() {        if(is12) {            return getLogger().isEnabledFor((Priority) Level.FATAL);        } else {            return getLogger().isEnabledFor(Level.FATAL);        }    }    /**     * Check whether the Log4j Logger used is enabled for <code>INFO</code> priority.     */    public boolean isInfoEnabled() {        return getLogger().isInfoEnabled();    }    /**     * Check whether the Log4j Logger used is enabled for <code>TRACE</code> priority.     * For Log4J, this returns the value of <code>isDebugEnabled()</code>     */    public boolean isTraceEnabled() {        return getLogger().isDebugEnabled();    }    /**     * Check whether the Log4j Logger used is enabled for <code>WARN</code> priority.     */    public boolean isWarnEnabled() {        if(is12) {            return getLogger().isEnabledFor((Priority) Level.WARN);        } else {            return getLogger().isEnabledFor(Level.WARN);        }    }}