/*

 *   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 java.sql.SQLException;

import java.util.Map;

import java.util.concurrent.ConcurrentHashMap;

import org.sonews.storage.Storage;

import org.sonews.storage.StorageBackendException;

import org.sonews.storage.StorageProvider;

/**

 *

 * @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);

    }

  }

}