/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2006, Red Hat Middleware LLC, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * 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; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.resource.adapter.jdbc.vendor;

import java.sql.Connection;
import java.sql.SQLException;
import java.lang.reflect.Method;

import org.jboss.logging.Logger;
import org.jboss.resource.adapter.jdbc.ReauthenticationMechansim;

public class MySqlReauthenticationMechansimImpl implements ReauthenticationMechansim
{
	private static final Logger log = Logger.getLogger(MySqlReauthenticationMechansimImpl.class);
	private Method changeUser;
	private Object[] params;
	
	public MySqlReauthenticationMechansimImpl() 
	{
		try 
		{
			Class mysqlConnection = Thread.currentThread().getContextClassLoader().loadClass("com.mysql.jdbc.jdbc2.optional.ConnectionWrapper");
			changeUser = mysqlConnection.getMethod("changeUser", new Class[] {String.class,String.class});			
		} 
		catch (Exception e) 
		{
			log.warn("Cannot resolve com.mysq.jdbc.Connection.changeUser method.", e);
		}
	}	
	public void reauthenticate(Connection con, String user, String password) throws SQLException
	{
	   log.trace("Going to Authenticate the Connection here "+con+" with credentianls as username="+user+" password="+password);
	   params = new Object[]{user,password};
	   try 
	   {
		   changeUser.invoke(con, params);
	   }
	   catch (Exception e) 
	   {
		    Throwable t = e.getCause();		    
			if (t instanceof SQLException) {
				throw (SQLException)e;
			} else {
				log.error("Unexpected error in changeUser", e);				
			}
	   }
	   log.trace("Re-Authentication succeeded !!!");
	}
}