/*

  *   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;

 /**

  *

  * @author Christian Lins

  * @since sonews/1.0

  */

 public final class StorageManager

 {

   private static StorageProvider provider;

   public static Storage current()

     throws StorageBackendException

   {

     synchronized(StorageManager.class)

     {

       if(provider == null)

       {

         return null;

       }

       else

       {

         return provider.storage(Thread.currentThread());

       }

     }

   }

   public static StorageProvider loadProvider(String pluginClassName)

   {

     try

     {

       Class<?> clazz = Class.forName(pluginClassName);

       Object   inst  = clazz.newInstance();

       return (StorageProvider)inst;

     }

     catch(Exception ex)

     {

       System.err.println(ex);

       return null;

     }

   }

   /**

    * Sets the current storage provider.

    * @param provider

    */

   public static void enableProvider(StorageProvider provider)

   {

     synchronized(StorageManager.class)

     {

       if(StorageManager.provider != null)

       {

         disableProvider();

       }

       StorageManager.provider = provider;

     }

   }

   /**

    * Disables the current provider.

    */

   public static void disableProvider()

   {

     synchronized(StorageManager.class)

     {

       provider = null;

     }

   }

 }