--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/logging/LoggerInitializer.java	Mon Mar 04 20:15:24 2019 +0100
@@ -0,0 +1,78 @@
+/**
+ * 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());
+	}
+}