diff -r d78b74a2abe9 -r 93208f791318 java/dictionary-generator/src/cz/frantovo/telco/dictionary/Functions.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/dictionary-generator/src/cz/frantovo/telco/dictionary/Functions.java	Tue Jul 09 18:59:07 2013 +0200
@@ -0,0 +1,92 @@
+/**
+ * Free Telco Dictionary
+ * 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 cz.frantovo.telco.dictionary;
+
+import java.io.Closeable;
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.w3c.dom.Node;
+import org.w3c.dom.NodeList;
+
+/**
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public class Functions {
+
+	private static final Logger log = Logger.getLogger(Functions.class.getName());
+
+	public static Iterable<Node> nodeIterable(final NodeList list) {
+		return new Iterable<Node>() {
+			@Override
+			public Iterator<Node> iterator() {
+				return new Iterator<Node>() {
+					int position;
+
+					@Override
+					public boolean hasNext() {
+						return position < list.getLength();
+					}
+
+					@Override
+					public Node next() {
+						return list.item(position++);
+					}
+
+					@Override
+					public void remove() {
+						throw new UnsupportedOperationException("remove not supported");
+					}
+				};
+			}
+		};
+	}
+
+	public static void close(Closeable c) {
+		try {
+			c.close();
+		} catch (Exception e) {
+			log.log(Level.WARNING, "closing of " + c + " has failed", e);
+		}
+	}
+
+	public static boolean equalz(Object a, Object b) {
+		return a == null ? b == null : a.equals(b);
+	}
+
+	public static <K, V> Set<K> getKeysForValue(Map<K, V> map, V value) {
+		Set<K> keysFound = new HashSet<>();
+
+		for (Entry<K, V> entry : map.entrySet()) {
+			if (equalz(value, entry.getValue())) {
+				keysFound.add(entry.getKey());
+			}
+		}
+
+		return keysFound;
+	}
+
+	private Functions() {
+	}
+}