diff -r 29df3b2e34df -r f32dac78d13a java/sql-dk/src/info/globalcode/sql/dk/Functions.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/sql-dk/src/info/globalcode/sql/dk/Functions.java	Sun Dec 15 19:20:50 2013 +0100
@@ -0,0 +1,70 @@
+package info.globalcode.sql.dk;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Map;
+
+/**
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public class Functions {
+
+	private Functions() {
+	}
+
+	public static boolean equalz(Object a, Object b) {
+		return a == null ? b == null : a.equals(b);
+	}
+
+	/**
+	 *
+	 * @param text String to be examinated
+	 * @param trim whether text should be trimmed before examination
+	 * @return whether text is not empty and one or more characters long (after prospective trim)
+	 */
+	public static boolean isEmpty(String text, boolean trim) {
+		if (text == null) {
+			return true;
+		} else {
+			if (trim) {
+				text = text.trim();
+			}
+			return text.isEmpty();
+		}
+	}
+
+	/**
+	 * @see #isEmpty(java.lang.String, boolean)
+	 */
+	public static boolean isNotEmpty(String text, boolean trim) {
+		return !isEmpty(text, trim);
+	}
+
+	public boolean isEmpty(Collection c) {
+		return c == null || c.isEmpty();
+	}
+
+	public boolean isNotEmpty(Collection c) {
+		return !isEmpty(c);
+	}
+
+	public boolean isEmpty(Map m) {
+		return m == null || m.isEmpty();
+	}
+
+	public boolean isNotEmpty(Map m) {
+		return !isEmpty(m);
+	}
+
+	/**
+	 * @return empty collection if given one is null | or the original one
+	 */
+	public static <T> Collection<T> notNull(Collection<T> c) {
+		if (c == null) {
+			return new ArrayList<>();
+		} else {
+			return c;
+		}
+	}
+}