[Myfaces Wiki] Update of "Trinidad and Common Logging" by MarkusDoering

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The following page has been changed by MarkusDoering:
http://wiki.apache.org/myfaces/Trinidad_and_Common_Logging

New page:
I've build a little wrapper around the trinidad / java.util.logging to send the log messages to common logging.
I had a little help on the mailing list but don't find these old mails, so just write it in here if oyu think you should be mentioned for this ;)

here is the source:

{{{
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Writes JDK log messages to commons logging.
 */
public class JavaLoggingToCommonLoggingRedirector {
	static JDKLogHandler activeHandler;

	/**
	 * Activates this feature.
	 */
	public static void activate() {
		try {
			Logger rootLogger = LogManager.getLogManager().getLogger("");
			// remove old handlers
			for (Handler handler : rootLogger.getHandlers()) {
				rootLogger.removeHandler(handler);
			}
			// add our own
			activeHandler = new JDKLogHandler();
			activeHandler.setLevel(Level.ALL);
			rootLogger.addHandler(activeHandler);
			rootLogger.setLevel(Level.ALL);
			// done, let's check it right away!!!

			Logger.getLogger(JavaLoggingToCommonLoggingRedirector.class.getName()).info("activated: sending JDK log messages to Commons Logging");
		} catch (Exception exc) {
			LogFactory.getLog(JavaLoggingToCommonLoggingRedirector.class).error("activation failed", exc);
		}
	}

	public static void deactivate() {
		Logger rootLogger = LogManager.getLogManager().getLogger("");
		rootLogger.removeHandler(activeHandler);

		Logger.getLogger(JavaLoggingToCommonLoggingRedirector.class.getName()).info("dactivated");
	}

	protected static class JDKLogHandler extends Handler {
		private Map<String, Log> cachedLogs = new ConcurrentHashMap<String, Log>();

		private Log getLog(String logName) {
			Log log = cachedLogs.get(logName);
			if (log == null) {
				log = LogFactory.getLog(logName);
				cachedLogs.put(logName, log);
			}
			return log;
		}

		@Override
		public void publish(LogRecord record) {
			Log log = getLog(record.getLoggerName());
			String message = record.getMessage();
			Throwable exception = record.getThrown();
			Level level = record.getLevel();
			if (level == Level.SEVERE) {
				log.error(message, exception);
			} else if (level == Level.WARNING) {
				log.warn(message, exception);
			} else if (level == Level.INFO) {
				log.info(message, exception);
			} else if (level == Level.CONFIG) {
				log.debug(message, exception);
			} else {
				log.trace(message, exception);
			}
		}

		@Override
		public void flush() {
			// nothing to do
		}

		@Override
		public void close() {
			// nothing to do
		}
	}
}
}}}

after this you just have to call JavaLoggingToCommonLoggingRedirector.activate() once in your code (startup / startup-servlet someting like this)