1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/logging/LoggerInitializer.java	Mon Mar 04 20:15:24 2019 +0100
     1.3 @@ -0,0 +1,78 @@
     1.4 +/**
     1.5 + * SQL-DK
     1.6 + * Copyright © 2013 František Kučera (frantovo.cz)
     1.7 + *
     1.8 + * This program is free software: you can redistribute it and/or modify
     1.9 + * it under the terms of the GNU General Public License as published by
    1.10 + * the Free Software Foundation, either version 3 of the License, or
    1.11 + * (at your option) any later version.
    1.12 + *
    1.13 + * This program is distributed in the hope that it will be useful,
    1.14 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
    1.15 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    1.16 + * GNU General Public License for more details.
    1.17 + *
    1.18 + * You should have received a copy of the GNU General Public License
    1.19 + * along with this program. If not, see <http://www.gnu.org/licenses/>.
    1.20 + */
    1.21 +package info.globalcode.sql.dk.logging;
    1.22 +
    1.23 +import info.globalcode.sql.dk.Constants;
    1.24 +import java.util.logging.ConsoleHandler;
    1.25 +import java.util.logging.Handler;
    1.26 +import java.util.logging.Level;
    1.27 +import java.util.logging.Logger;
    1.28 +
    1.29 +/**
    1.30 + * Configures logging subsystem.
    1.31 + * Usage: java -Djava.util.logging.config.class=info.globalcode.sql.dk.logging.LoggerInitializer …
    1.32 + *
    1.33 + * @author Ing. František Kučera (frantovo.cz)
    1.34 + */
    1.35 +public class LoggerInitializer {
    1.36 +
    1.37 +	private static final Logger log = Logger.getLogger(LoggerInitializer.class.getName());
    1.38 +	public static final String LEVEL_PROPERTY = LoggerInitializer.class.getName() + ".level";
    1.39 +	private static final Level DEFAULT_LEVEL = Level.INFO;
    1.40 +
    1.41 +	public LoggerInitializer() {
    1.42 +		Logger logger = Logger.getLogger(Constants.JAVA_PACKAGE);
    1.43 +		ConsoleHandler handler = new ConsoleHandler();
    1.44 +		ColorfulConsoleFormatter formatter = new ColorfulConsoleFormatter();
    1.45 +
    1.46 +		logger.addHandler(handler);
    1.47 +		handler.setFormatter(formatter);
    1.48 +
    1.49 +		setLevel(logger, handler, formatter);
    1.50 +
    1.51 +
    1.52 +		/**
    1.53 +		 * TODO: optional FileHandler – detailed logs in file in ~/sql-dk/log/…
    1.54 +		 */
    1.55 +	}
    1.56 +
    1.57 +	private void setLevel(Logger logger, Handler handler, ColorfulConsoleFormatter formatter) {
    1.58 +		boolean levelParseError = false;
    1.59 +		Level level;
    1.60 +		String cliLevel = System.getProperty(LEVEL_PROPERTY);
    1.61 +		if (cliLevel == null) {
    1.62 +			level = DEFAULT_LEVEL;
    1.63 +		} else {
    1.64 +			try {
    1.65 +				level = Level.parse(cliLevel);
    1.66 +			} catch (IllegalArgumentException e) {
    1.67 +				level = DEFAULT_LEVEL;
    1.68 +				levelParseError = true;
    1.69 +			}
    1.70 +		}
    1.71 +
    1.72 +		handler.setLevel(level);
    1.73 +		logger.setLevel(level);
    1.74 +
    1.75 +		if (levelParseError) {
    1.76 +			log.log(Level.WARNING, "Invalid logging level „{0}“ specified in „{1}“ → using default level „{2}“", new Object[]{cliLevel, LEVEL_PROPERTY, DEFAULT_LEVEL});
    1.77 +		}
    1.78 +
    1.79 +		formatter.setPrintStacktrace(level.intValue() < Level.INFO.intValue());
    1.80 +	}
    1.81 +}