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OpenSearchServer is a powerful, enterprise-class, search engine program. Using the web user interface, the crawlers (web, file, database, ...) and the REST/RESTFul API you will be able to integrate quickly and easily advanced full-text search capabilities in your application. OpenSearchServer runs on Windows and Linux/Unix/BSD.

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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2008-2012 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer 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.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see .
 **/

package com.jaeksoft.searchlib.util.map;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map.Entry;
import java.util.TreeMap;

public class GenericMap {

	private TreeMap> map;
	private List> list;

	public GenericMap() {
		map = new TreeMap>();
		list = null;
	}

	public List> getList() {
		synchronized (this) {
			if (list != null)
				return list;
			list = new ArrayList>(0);
			Iterator>> it = map.entrySet().iterator();
			while (it.hasNext()) {
				Entry> entry = it.next();
				for (T2 t : entry.getValue())
					list.add(new GenericLink(entry.getKey(), t));
			}
			return list;
		}
	}

	public void clear() {
		synchronized (this) {
			map.clear();
			list = null;
		}
	}

	public void copyTo(GenericMap dest) {
		synchronized (this) {
			dest.clear();
			for (GenericLink lnk : getList())
				dest.add(lnk.getSource(), lnk.getTarget());
		}
	}

	public void add(T1 source, T2 target) {
		synchronized (this) {
			List l = map.get(source);
			if (l == null) {
				l = new ArrayList();
				map.put(source, l);
			} else if (l.contains(target))
				return;
			l.add(target);
			list = null;
		}
	}

	public void remove(GenericLink link) {
		synchronized (this) {
			T1 source = link.getSource();
			List l = map.get(source);
			if (l == null)
				return;
			l.remove(link.getTarget());
			if (l.size() == 0)
				map.remove(source);
			list = null;
		}
	}

	public List getLinks(T1 source) {
		synchronized (this) {
			return map.get(source);
		}
	}

}