/*
 * 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;

import java.io.Serializable;
import java.sql.Connection;
import java.sql.Statement;
import java.sql.SQLException;

/**
 * Implements check valid connection sql
 *
 * @author <a href="mailto:adrian@jboss.org">Adrian Brock</a>
 * @version $Revision: 57189 $
 */
public class CheckValidConnectionSQL
   implements ValidConnectionChecker, Serializable
{
   private static final long serialVersionUID = -222752863430216887L;
   
   String sql;
   
   public CheckValidConnectionSQL()
   {
   }

   public CheckValidConnectionSQL(String sql)
   {
      this.sql = sql;
   }

   public SQLException isValidConnection(Connection c)
   {
      try    
      {
         Statement s = c.createStatement();
         try
         {
            s.execute(sql);
            return null;
         }
         finally
         {
            s.close();
         }
      }
      catch (SQLException e)
      {
         return e;
      }
   }
}