source: trunk/quest-ui-core/src/main/java/de/ugoe/cs/quest/log4j/Log4JLogger.java @ 633

package de.ugoe.cs.quest.log4j;

import java.util.logging.Level;

import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

import de.ugoe.cs.util.console.Console;
import de.ugoe.cs.util.console.listener.ICommandListener;
import de.ugoe.cs.util.console.listener.IErrorListener;
import de.ugoe.cs.util.console.listener.IExceptionListener;
import de.ugoe.cs.util.console.listener.ITraceListener;

/**
 * <p>
 * Implements logging based on the log4j API.
 * </p>
 * 
 * @author Steffen Herbold
 * @version 1.0
 */
public class Log4JLogger implements IErrorListener, ITraceListener,
                IExceptionListener, ICommandListener {

        /**
         * <p>
         * Reference to the logger.
         * </p>
         */
        Logger logger;

        /**
         * <p>
         * Constructor. Creates a new Log4JLogger and registers the implemented
         * listener with the {@link Console}.
         * </p>
         */
        public Log4JLogger() {
                PropertyConfigurator.configure("data/log4j.properties");
                logger = Logger.getLogger("de.ugoe.cs.quest");
                Console.getInstance().registerErrorListener(this);
                Console.getInstance().registerTraceListener(this);
                Console.getInstance().registerExceptionListener(this);
                Console.getInstance().registerCommandListener(this);
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * de.ugoe.cs.util.console.listener.ICommandListener#commandNotification
         * (java.lang.String)
         */
        @Override
        public void commandNotification(String command) {
                logger.info("Command executed: " + command);
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * de.ugoe.cs.util.console.listener.IExceptionListener#printStacktrace(java
         * .lang.Exception)
         */
        @Override
        public void logException(Exception e) {
                logger.error("", e);
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * de.ugoe.cs.util.console.listener.ITraceListener#traceMsg(java.lang.String
         * )
         */
        @Override
        public void traceMsg(String traceMessage, Level level) {
            logger.log(convertToLog4JLevel(level), traceMessage);
        }

        /*
         * (non-Javadoc)
         * 
         * @see
         * de.ugoe.cs.util.console.listener.IErrorListener#errorMsg(java.lang.String
         * )
         */
        @Override
        public void errorMsg(String errMessage) {
                logger.error(errMessage);
        }
        
        /**
         * <p>
         * Converts the log level described by {@link Level} into a {@link org.apache.log4j.Level}.
         * </p>
         *
         * @param level java.util.logger.Level severity
         * @return org.apache.log4j.Level severity
         */
        private org.apache.log4j.Level convertToLog4JLevel(Level level) {
            if(level==Level.OFF) {
                return org.apache.log4j.Level.OFF;
            }
            if(level==Level.SEVERE) {
                return org.apache.log4j.Level.FATAL;
            }
            if(level==Level.WARNING) {
                return org.apache.log4j.Level.WARN;
            }
            if(level==Level.INFO || level==Level.CONFIG) {
                return org.apache.log4j.Level.INFO;
            }
            // remaining levels: FINE, FINER, FINEST, ALL
            return org.apache.log4j.Level.ALL;
        }
}