com.mchange.v1.db.sql.WeakHashPSManager Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of mchange-commons-java Show documentation

mchange-commons-java

There is a newer version: 0.3.1

/*
 * Distributed as part of mchange-commons-java v.0.2.3
 *
 * Copyright (C) 2012 Machinery For Change, Inc.
 *
 * Author: Steve Waldman 
 *
 * This library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 2.1, as 
 * published by the Free Software Foundation.
 *
 * 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.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this software; see the file LICENSE.  If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */


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);
    }
}