/**

  * SQL-DK

  * Copyright © 2013 František Kučera (frantovo.cz)

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, either version 3 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. If not, see <http://www.gnu.org/licenses/>.

  */

 package info.globalcode.sql.dk.logging;

 import info.globalcode.sql.dk.Constants;

 import java.util.logging.ConsoleHandler;

 import java.util.logging.Handler;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 /**

  * Configures logging subsystem.

  * Usage: java -Djava.util.logging.config.class=info.globalcode.sql.dk.logging.LoggerInitializer …

  *

  * @author Ing. František Kučera (frantovo.cz)

  */

 public class LoggerInitializer {

 	private static final Logger log = Logger.getLogger(LoggerInitializer.class.getName());

 	public static final String LEVEL_PROPERTY = LoggerInitializer.class.getName() + ".level";

 	private static final Level DEFAULT_LEVEL = Level.INFO;

 	public LoggerInitializer() {

 		Logger logger = Logger.getLogger(Constants.JAVA_PACKAGE);

 		ConsoleHandler handler = new ConsoleHandler();

 		ColorfulConsoleFormatter formatter = new ColorfulConsoleFormatter();

 		logger.addHandler(handler);

 		handler.setFormatter(formatter);

 		setLevel(logger, handler, formatter);

 		/**

 		 * TODO: optional FileHandler – detailed logs in file in ~/sql-dk/log/…

 		 */

 	}

 	private void setLevel(Logger logger, Handler handler, ColorfulConsoleFormatter formatter) {

 		boolean levelParseError = false;

 		Level level;

 		String cliLevel = System.getProperty(LEVEL_PROPERTY);

 		if (cliLevel == null) {

 			level = DEFAULT_LEVEL;

 		} else {

 			try {

 				level = Level.parse(cliLevel);

 			} catch (IllegalArgumentException e) {

 				level = DEFAULT_LEVEL;

 				levelParseError = true;

 			}

 		}

 		handler.setLevel(level);

 		logger.setLevel(level);

 		if (levelParseError) {

 			log.log(Level.WARNING, "Invalid logging level „{0}“ specified in „{1}“ → using default level „{2}“", new Object[]{cliLevel, LEVEL_PROPERTY, DEFAULT_LEVEL});

 		}

 		formatter.setPrintStacktrace(level.intValue() < Level.INFO.intValue());

 	}

 }