java/dictionary-generator/src/cz/frantovo/telco/dictionary/Functions.java
author František Kučera <franta-hg@frantovo.cz>
Sun, 18 Aug 2013 16:54:57 +0200
changeset 104 6429725efb09
parent 47 b87ea854d920
child 130 b8dc8a6f82cf
permissions -rw-r--r--
data: user generated content
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/**
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 * Free Telco Dictionary
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 * Copyright © 2013 František Kučera (frantovo.cz)
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation, either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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 */
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package cz.frantovo.telco.dictionary;
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import java.io.Closeable;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Set;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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/**
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 *
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 * @author Ing. František Kučera (frantovo.cz)
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 */
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public class Functions {
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	private static final Logger log = Logger.getLogger(Functions.class.getName());
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	public static Iterable<Node> nodeIterable(final NodeList list) {
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		return new Iterable<Node>() {
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			@Override
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			public Iterator<Node> iterator() {
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				return new Iterator<Node>() {
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					int position;
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					@Override
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					public boolean hasNext() {
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						return position < list.getLength();
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					}
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					@Override
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					public Node next() {
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						return list.item(position++);
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					}
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					@Override
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					public void remove() {
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						throw new UnsupportedOperationException("remove not supported");
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					}
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				};
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			}
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		};
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	}
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	public static void close(Closeable c) {
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		try {
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			c.close();
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		} catch (Exception e) {
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			log.log(Level.WARNING, "closing of " + c + " has failed", e);
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		}
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	}
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	public static boolean equalz(Object a, Object b) {
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		return a == null ? b == null : a.equals(b);
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	}
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	public static <K, V> Set<K> getKeysForValue(Map<K, V> map, V value) {
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		Set<K> keysFound = new HashSet<>();
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		for (Entry<K, V> entry : map.entrySet()) {
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			if (equalz(value, entry.getValue())) {
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				keysFound.add(entry.getKey());
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			}
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		}
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		return keysFound;
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	}
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	private Functions() {
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	}
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}