1 /**

     2  * SQL-DK

     3  * Copyright © 2013 František Kučera (frantovo.cz)

     4  *

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

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

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

     8  * (at your option) any later version.

     9  *

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

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

    12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

    13  * GNU General Public License for more details.

    14  *

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

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

    17  */

    18 package info.globalcode.sql.dk.logging;

    19 

    20 import info.globalcode.sql.dk.Constants;

    21 import java.util.logging.ConsoleHandler;

    22 import java.util.logging.Handler;

    23 import java.util.logging.Level;

    24 import java.util.logging.Logger;

    25 

    26 /**

    27  * Configures logging subsystem.

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

    29  *

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

    31  */

    32 public class LoggerInitializer {

    33 

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

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

    36 	private static final Level DEFAULT_LEVEL = Level.INFO;

    37 

    38 	public LoggerInitializer() {

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

    40 		ConsoleHandler handler = new ConsoleHandler();

    41 		ColorfulConsoleFormatter formatter = new ColorfulConsoleFormatter();

    42 

    43 		logger.addHandler(handler);

    44 		handler.setFormatter(formatter);

    45 

    46 		setLevel(logger, handler, formatter);

    47 

    48 

    49 		/**

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

    51 		 */

    52 	}

    53 

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

    55 		boolean levelParseError = false;

    56 		Level level;

    57 		String cliLevel = System.getProperty(LEVEL_PROPERTY);

    58 		if (cliLevel == null) {

    59 			level = DEFAULT_LEVEL;

    60 		} else {

    61 			try {

    62 				level = Level.parse(cliLevel);

    63 			} catch (IllegalArgumentException e) {

    64 				level = DEFAULT_LEVEL;

    65 				levelParseError = true;

    66 			}

    67 		}

    68 

    69 		handler.setLevel(level);

    70 		logger.setLevel(level);

    71 

    72 		if (levelParseError) {

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

    74 		}

    75 

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

    77 	}

    78 }