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Awake SQL is an open source framework that allows remote and secure JDBC access through HTTP.
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/*
 * This file is part of Awake SQL. 
 * Awake SQL: Remote JDBC access over HTTP.                                    
 * Copyright (C) 2013,  KawanSoft SAS
 * (http://www.kawansoft.com). All rights reserved.                    
 *                                                                         
 * Awake SQL 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.         
 *              
 * Awake SQL 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          
 * Lesser 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 .
 *
 * If you develop commercial activities using Awake SQL, you must: 
 * a) disclose and distribute all source code of your own product,
 * b) license your own product under the GNU General Public License.
 * 
 * You can be released from the requirements of the license by
 * purchasing a commercial license. Buying such a license will allow you 
 * to ship Awake SQL with your closed source products without disclosing 
 * the source code.
 *
 * For more information, please contact KawanSoft SAS at this
 * address: [email protected]
 * 
 * Any modifications to this file must keep this entire header
 * intact.
 */
package org.awakefw.sql.util;

import java.util.HashMap;
import java.util.Hashtable;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.TreeMap;

/**
 * 
 * Utility class to build a defensive copy of a Map, backed by a Hashmap,
 * Hashtable , LinkedHashMap or TreeMap.
 * 
 * @author Nicolas de Pomereu
 * 
 */
public class MapCopier {

    /**
     * Protected constructor
     */
    public MapCopier() {

    }

    /**
     * Copy a Map to another Map
     * 
     * @param map
     *            the map to copy
     * @return the copied map
     */
    public Map copy(Map map) {
	Map mapCopy = null;

	if (map instanceof HashMap) {
	    mapCopy = new HashMap(map);
	} else if (map instanceof Hashtable) {
	    mapCopy = new Hashtable(map);
	} else if (map instanceof LinkedHashMap) {
	    mapCopy = new LinkedHashMap(map);
	} else if (map instanceof TreeMap) {
	    mapCopy = new TreeMap(map);
	} else {
	    throw new IllegalArgumentException(
		    "copy implementation not supported for Map class: "
			    + map.getClass());
	}

	/*
	 * Set keys = map.keySet();
	 * 
	 * for (Iterator iterator = keys.iterator(); iterator.hasNext();) { K
	 * key = (K) iterator.next(); V value = map.get(key);
	 * 
	 * mapCopy.put(key, value); }
	 */

	return mapCopy;
    }

}