diff -r 7e08730da258 -r 4a1864c3e867 java/sql-dk/src/main/java/info/globalcode/sql/dk/configuration/Properties.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/main/java/info/globalcode/sql/dk/configuration/Properties.java	Mon Mar 04 20:15:24 2019 +0100
@@ -0,0 +1,129 @@
+/**
+ * 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.configuration;
+
+import java.util.ArrayList;
+import javax.xml.bind.annotation.XmlTransient;
+import static info.globalcode.sql.dk.Functions.findByName;
+import java.util.Collections;
+
+/**
+ * <p>
+ * List of configurables.</p>
+ *
+ * <p>
+ * Can be backed by defaults – if value for given name is nof found in this instance, we will
+ * look into defaults. Methods also accept defaultValue parameter – is used if property is nof found
+ * even in default properties.</p>
+ *
+ * <p>
+ * Typical use: </p>
+ * <ul>
+ * <li>this instance – ad-hoc properties from CLI options</li>
+ * <li>default properties – from config file</li>
+ * <li>defaultValue – hardcoded default</li>
+ * </ul>
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public class Properties extends ArrayList<Property> implements Cloneable {
+
+	private Properties defaults;
+
+	public Properties() {
+	}
+
+	public Properties(int initialCapacity) {
+		super(initialCapacity);
+	}
+
+	@XmlTransient
+	public Properties getDefaults() {
+		return defaults;
+	}
+
+	public void setDefaults(Properties defaults) {
+		this.defaults = defaults;
+	}
+
+	/**
+	 * @param defaults the last/deepest defaults
+	 */
+	public void setLastDefaults(Properties defaults) {
+		if (this.defaults == null) {
+			this.defaults = defaults;
+		} else {
+			this.defaults.setLastDefaults(defaults);
+		}
+	}
+
+	private Property findProperty(String name) {
+		Property p = findByName(this, name);
+		if (p == null && defaults != null) {
+			p = defaults.findProperty(name);
+		}
+		return p;
+	}
+
+	public String getString(String name, String defaultValue) {
+		Property p = findProperty(name);
+		return p == null ? defaultValue : p.getValue();
+	}
+
+	public boolean getBoolean(String name, boolean defaultValue) {
+		Property p = findProperty(name);
+		return p == null ? defaultValue : Boolean.valueOf(p.getValue());
+	}
+
+	public int getInteger(String name, int defaultValue) {
+		Property p = findProperty(name);
+		return p == null ? defaultValue : Integer.valueOf(p.getValue());
+	}
+
+	public boolean hasProperty(String name) {
+		return findByName(this, name) != null;
+	}
+
+	@Override
+	public Properties clone() {
+		Properties clone = new Properties(size());
+		Collections.copy(clone, this);
+		return clone;
+	}
+
+	/**
+	 * @return merged this and backing defaults as Java Properties
+	 */
+	public java.util.Properties getJavaProperties() {
+		java.util.Properties javaProperties = new java.util.Properties();
+		duplicateTo(javaProperties);
+		return javaProperties;
+	}
+
+	private void duplicateTo(java.util.Properties javaProperties) {
+		if (defaults != null) {
+			defaults.duplicateTo(javaProperties);
+		}
+		for (Property p : this) {
+			String value = p.getValue();
+			if (value != null) {
+				javaProperties.setProperty(p.getName(), value);
+			}
+		}
+	}
+}