/*

  *   SONEWS News Server

  *   see AUTHORS for the list of contributors

  *

  *   This program 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.

  *

  *   This program 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 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 <http://www.gnu.org/licenses/>.

  */

 package org.sonews.storage.impl;

 import org.sonews.storage.*;

 import java.sql.SQLException;

 import java.util.Map;

 import java.util.concurrent.ConcurrentHashMap;

 /**

  *

  * @author Christian Lins

  * @since sonews/1.0

  */

 public class JDBCDatabaseProvider implements StorageProvider

 {

   protected static final Map<Thread, JDBCDatabase> instances

     = new ConcurrentHashMap<Thread, JDBCDatabase>();

   @Override

   public boolean isSupported(String uri)

   {

     throw new UnsupportedOperationException("Not supported yet.");

   }

   @Override

   public Storage storage(Thread thread)

     throws StorageBackendException

   {

     try

     {

     if(!instances.containsKey(Thread.currentThread()))

     {

       JDBCDatabase db = new JDBCDatabase();

       db.arise();

       instances.put(Thread.currentThread(), db);

       return db;

     }

     else

     {

       return instances.get(Thread.currentThread());

     }

     }

     catch(SQLException ex)

     {

       throw new StorageBackendException(ex);

     }

   }

 }