franta-hg@15: /**
franta-hg@15:  * Free Telco Dictionary
franta-hg@15:  * Copyright © 2013 František Kučera (frantovo.cz)
franta-hg@15:  *
franta-hg@15:  * This program is free software: you can redistribute it and/or modify
franta-hg@15:  * it under the terms of the GNU General Public License as published by
franta-hg@151:  * the Free Software Foundation, version 3 of the License.
franta-hg@15:  *
franta-hg@15:  * This program is distributed in the hope that it will be useful,
franta-hg@15:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
franta-hg@15:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
franta-hg@15:  * GNU General Public License for more details.
franta-hg@15:  *
franta-hg@15:  * You should have received a copy of the GNU General Public License
franta-hg@15:  * along with this program. If not, see <http://www.gnu.org/licenses/>.
franta-hg@15:  */
franta-hg@15: package cz.frantovo.telco.dictionary;
franta-hg@15: 
franta-hg@15: import java.io.Closeable;
franta-hg@15: import java.util.HashSet;
franta-hg@15: import java.util.Iterator;
franta-hg@15: import java.util.Map;
franta-hg@15: import java.util.Map.Entry;
franta-hg@15: import java.util.Set;
franta-hg@15: import java.util.logging.Level;
franta-hg@15: import java.util.logging.Logger;
franta-hg@15: import org.w3c.dom.Node;
franta-hg@15: import org.w3c.dom.NodeList;
franta-hg@15: 
franta-hg@15: /**
franta-hg@130:  * Common functions
franta-hg@130:  * 
franta-hg@15:  * @author Ing. František Kučera (frantovo.cz)
franta-hg@15:  */
franta-hg@15: public class Functions {
franta-hg@15: 
franta-hg@15: 	private static final Logger log = Logger.getLogger(Functions.class.getName());
franta-hg@15: 
franta-hg@15: 	public static Iterable<Node> nodeIterable(final NodeList list) {
franta-hg@15: 		return new Iterable<Node>() {
franta-hg@15: 			@Override
franta-hg@15: 			public Iterator<Node> iterator() {
franta-hg@15: 				return new Iterator<Node>() {
franta-hg@15: 					int position;
franta-hg@15: 
franta-hg@15: 					@Override
franta-hg@15: 					public boolean hasNext() {
franta-hg@15: 						return position < list.getLength();
franta-hg@15: 					}
franta-hg@15: 
franta-hg@15: 					@Override
franta-hg@15: 					public Node next() {
franta-hg@15: 						return list.item(position++);
franta-hg@15: 					}
franta-hg@15: 
franta-hg@15: 					@Override
franta-hg@15: 					public void remove() {
franta-hg@15: 						throw new UnsupportedOperationException("remove not supported");
franta-hg@15: 					}
franta-hg@15: 				};
franta-hg@15: 			}
franta-hg@15: 		};
franta-hg@15: 	}
franta-hg@15: 
franta-hg@15: 	public static void close(Closeable c) {
franta-hg@15: 		try {
franta-hg@15: 			c.close();
franta-hg@15: 		} catch (Exception e) {
franta-hg@15: 			log.log(Level.WARNING, "closing of " + c + " has failed", e);
franta-hg@15: 		}
franta-hg@15: 	}
franta-hg@15: 
franta-hg@15: 	public static boolean equalz(Object a, Object b) {
franta-hg@15: 		return a == null ? b == null : a.equals(b);
franta-hg@15: 	}
franta-hg@15: 
franta-hg@15: 	public static <K, V> Set<K> getKeysForValue(Map<K, V> map, V value) {
franta-hg@15: 		Set<K> keysFound = new HashSet<>();
franta-hg@15: 
franta-hg@15: 		for (Entry<K, V> entry : map.entrySet()) {
franta-hg@15: 			if (equalz(value, entry.getValue())) {
franta-hg@15: 				keysFound.add(entry.getKey());
franta-hg@15: 			}
franta-hg@15: 		}
franta-hg@15: 
franta-hg@15: 		return keysFound;
franta-hg@15: 	}
franta-hg@15: 
franta-hg@15: 	private Functions() {
franta-hg@15: 	}
franta-hg@15: }