--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/configuration/Loader.java	Mon Mar 04 20:15:24 2019 +0100
@@ -0,0 +1,101 @@
+/**
+ * SQL-DK
+ * Copyright © 2015 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.configuration;
+
+import info.globalcode.sql.dk.*;
+import static info.globalcode.sql.dk.DatabaseConnection.JDBC_PROPERTY_USER;
+import static info.globalcode.sql.dk.DatabaseConnection.JDBC_PROPERTY_PASSWORD;
+import java.sql.Connection;
+import java.sql.Driver;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import javax.xml.bind.JAXBContext;
+import javax.xml.bind.Unmarshaller;
+
+/**
+ * Configuration loader – deserializes Configuration from the XML file.
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public class Loader {
+
+	private static final Logger log = Logger.getLogger(Loader.class.getName());
+
+	public Configuration loadConfiguration() throws ConfigurationException {
+		try {
+			JAXBContext jaxb = JAXBContext.newInstance(Configuration.class.getPackage().getName(), Configuration.class.getClassLoader());
+			Unmarshaller u = jaxb.createUnmarshaller();
+			return (Configuration) u.unmarshal(Constants.CONFIG_FILE);
+		} catch (Exception e) {
+			throw new ConfigurationException("Unable to load configuration from " + Constants.CONFIG_FILE, e);
+		}
+	}
+
+	/**
+	 * JDBC connection should not be used directly in SQL-DK.
+	 *
+	 * @see DatabaseDefinition#connect(info.globalcode.sql.dk.configuration.Properties)
+	 * @param properties
+	 * @param databaseDefinition
+	 * @return
+	 * @throws java.sql.SQLException
+	 */
+	public static Connection jdbcConnect(DatabaseDefinition databaseDefinition, Properties properties) throws SQLException {
+		synchronized (properties) {
+			/**
+			 * Avoid rewriting the properties. Usually, the connection is created only once, but
+			 * with --test-connection and with SQL-DK JDBC driver, it might be reused.
+			 */
+			properties = properties.clone();
+		}
+		if (properties.hasProperty(JDBC_PROPERTY_PASSWORD)) {
+			log.log(Level.WARNING, "Passing DB password as CLI parameter is insecure!");
+		}
+		Properties credentials = new Properties();
+		credentials.add(new Property(JDBC_PROPERTY_USER, databaseDefinition.getUserName()));
+		credentials.add(new Property(JDBC_PROPERTY_PASSWORD, databaseDefinition.getPassword()));
+		credentials.setDefaults(databaseDefinition.getProperties());
+		properties.setDefaults(credentials);
+		java.util.Properties javaProperties = properties.getJavaProperties();
+
+		String driverClassName = databaseDefinition.getDriver();
+		final String url = databaseDefinition.getUrl();
+		if (driverClassName == null) {
+			log.log(Level.FINE, "Using DriverManager to create connection for „{0}“", url);
+			return DriverManager.getConnection(url, javaProperties);
+		} else {
+			log.log(Level.FINE, "Using custom Driver „{0}“ to create connection for „{1}“", new Object[]{driverClassName, url});
+			try {
+				Class<Driver> driverClass = (Class<Driver>) Class.forName(driverClassName);
+				Driver driver = driverClass.newInstance();
+				Connection connection = driver.connect(url, javaProperties);
+				if (connection == null) {
+					log.log(Level.SEVERE, "Driver „{0}“ returend null → it does not accept the URL: „{1}“", new Object[]{driverClassName, url});
+					throw new SQLException("Unable to connect: driver returned null.");
+				} else {
+					return connection;
+				}
+			} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | SQLException e) {
+				throw new SQLException("Unable to connect usig specific driver: " + driverClassName, e);
+			}
+		}
+	}
+
+}