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Enables C3P0 with Hibernate connections in the GuicedPersistence provider Requires JDK 8 and up

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/*
 * Distributed as part of mchange-commons-java 0.2.11
 *
 * Copyright (C) 2015 Machinery For Change, Inc.
 *
 * Author: Steve Waldman 
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of EITHER:
 *
 *     1) The GNU Lesser General Public License (LGPL), version 2.1, as 
 *        published by the Free Software Foundation
 *
 * OR
 *
 *     2) The Eclipse Public License (EPL), version 1.0
 *
 * You may choose which license to accept if you wish to redistribute
 * or modify this work. You may offer derivatives of this work
 * under the license you have chosen, or you may provide the same
 * choice of license which you have been offered here.
 *
 * This software 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.
 *
 * You should have received copies of both LGPL v2.1 and EPL v1.0
 * along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
 * If not, the text of these licenses are currently available at
 *
 * LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
 *  EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php 
 * 
 */

package com.mchange.v1.db.sql;

import java.sql.*;
import java.util.*;

/*
 * I think this class is insufficient, because the 
 * values may be strongly referenced by the map, and
 * PreparedStatements may contain a backreference to
 * their connections.
 */
public class WeakHashPSManager implements PSManager
{
    WeakHashMap wmap = new WeakHashMap();

    public PreparedStatement getPS(Connection con, String stmt_name)
    {
	Map nameMap = (Map) wmap.get(con);
	return (nameMap == null ? null : (PreparedStatement) nameMap.get(stmt_name));
    }

    public void putPS(Connection con, String name, PreparedStatement stmt)
    {
	Map nameMap = (Map) wmap.get(con);
	if (nameMap == null)
	    {
		nameMap = new HashMap();
		wmap.put(con, nameMap);
	    }
	nameMap.put(name, stmt);
    }
}