/* * 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 java.util.logging.Level;import java.util.logging.Logger;import org.apache.commons.logging.Log;/** * <p>Implementation of the <code>org.apache.commons.logging.Log</code> * interface that wraps the standard JDK logging mechanisms that were * introduced in the Merlin release (JDK 1.4).</p> * * @author <a href="mailto:sanders@apache.org">Scott Sanders</a> * @author <a href="mailto:bloritsch@apache.org">Berin Loritsch</a> * @author <a href="mailto:donaldp@apache.org">Peter Donald</a> * @version $Revision: 1.13 $ $Date: 2004/06/06 21:10:21 $ */public class Jdk14Logger implements Log, Serializable {    // ----------------------------------------------------------- Constructors    /**     * Construct a named instance of this Logger.     *     * @param name Name of the logger to be constructed     */    public Jdk14Logger(String name) {        this.name = name;        logger = getLogger();    }    // ----------------------------------------------------- Instance Variables    /**     * The underlying Logger implementation we are using.     */    protected transient Logger logger = null;    /**     * The name of the logger we are wrapping.     */    protected String name = null;    // --------------------------------------------------------- Public Methods    private void log( Level level, String msg, Throwable ex ) {        Logger logger = getLogger();        if (logger.isLoggable(level)) {            // Hack (?) to get the stack trace.            Throwable dummyException=new Throwable();            StackTraceElement locations[]=dummyException.getStackTrace();            // Caller will be the third element            String cname="unknown";            String method="unknown";            if( locations!=null && locations.length >2 ) {                StackTraceElement caller=locations[2];                cname=caller.getClassName();                method=caller.getMethodName();            }            if( ex==null ) {                logger.logp( level, cname, method, msg );            } else {                logger.logp( level, cname, method, msg, ex );            }        }    }    /**     * Log a message with debug log level.     */    public void debug(Object message) {        log(Level.FINE, String.valueOf(message), null);    }    /**     * Log a message and exception with debug log level.     */    public void debug(Object message, Throwable exception) {        log(Level.FINE, String.valueOf(message), exception);    }    /**     * Log a message with error log level.     */    public void error(Object message) {        log(Level.SEVERE, String.valueOf(message), null);    }    /**     * Log a message and exception with error log level.     */    public void error(Object message, Throwable exception) {        log(Level.SEVERE, String.valueOf(message), exception);    }    /**     * Log a message with fatal log level.     */    public void fatal(Object message) {        log(Level.SEVERE, String.valueOf(message), null);    }    /**     * Log a message and exception with fatal log level.     */    public void fatal(Object message, Throwable exception) {        log(Level.SEVERE, String.valueOf(message), exception);    }    /**     * Return the native Logger instance we are using.     */    public Logger getLogger() {        if (logger == null) {            logger = Logger.getLogger(name);        }        return (logger);    }    /**     * Log a message with info log level.     */    public void info(Object message) {        log(Level.INFO, String.valueOf(message), null);    }    /**     * Log a message and exception with info log level.     */    public void info(Object message, Throwable exception) {        log(Level.INFO, String.valueOf(message), exception);    }    /**     * Is debug logging currently enabled?     */    public boolean isDebugEnabled() {        return (getLogger().isLoggable(Level.FINE));    }    /**     * Is error logging currently enabled?     */    public boolean isErrorEnabled() {        return (getLogger().isLoggable(Level.SEVERE));    }    /**     * Is fatal logging currently enabled?     */    public boolean isFatalEnabled() {        return (getLogger().isLoggable(Level.SEVERE));    }    /**     * Is info logging currently enabled?     */    public boolean isInfoEnabled() {        return (getLogger().isLoggable(Level.INFO));    }    /**     * Is trace logging currently enabled?     */    public boolean isTraceEnabled() {        return (getLogger().isLoggable(Level.FINEST));    }    /**     * Is warn logging currently enabled?     */    public boolean isWarnEnabled() {        return (getLogger().isLoggable(Level.WARNING));    }    /**     * Log a message with trace log level.     */    public void trace(Object message) {        log(Level.FINEST, String.valueOf(message), null);    }    /**     * Log a message and exception with trace log level.     */    public void trace(Object message, Throwable exception) {        log(Level.FINEST, String.valueOf(message), exception);    }    /**     * Log a message with warn log level.     */    public void warn(Object message) {        log(Level.WARNING, String.valueOf(message), null);    }    /**     * Log a message and exception with warn log level.     */    public void warn(Object message, Throwable exception) {        log(Level.WARNING, String.valueOf(message), exception);    }}