/*

  *   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.daemon.command;

 import java.io.IOException;

 import org.sonews.daemon.NNTPConnection;

 import org.sonews.storage.Channel;

 import org.sonews.storage.StorageBackendException;

 /**

  * Class handling the GROUP command.

  * <pre>

  *  Syntax

  *    GROUP group

  *

  *  Responses

  *    211 number low high group     Group successfully selected

  *    411                           No such newsgroup

  *

  *  Parameters

  *    group     Name of newsgroup

  *    number    Estimated number of articles in the group

  *    low       Reported low water mark

  *    high      Reported high water mark

  * </pre>

  * (from RFC 3977)

  * 

  * @author Christian Lins

  * @author Dennis Schwerdel

  * @since n3tpd/0.1

  */

 public class GroupCommand implements Command

 {

   @Override

   public String[] getSupportedCommandStrings()

   {

     return new String[]{"GROUP"};

   }

   @Override

   public boolean hasFinished()

   {

     return true;

   }

   @Override

   public boolean isStateful()

   {

     return true;

   }

   @Override

   public void processLine(NNTPConnection conn, final String line, byte[] raw)

     throws IOException, StorageBackendException

   {

     final String[] command = line.split(" ");

     Channel group;

     if(command.length >= 2)

     {

       group = Channel.getByName(command[1]);

       if(group == null || group.isDeleted())

       {

         conn.println("411 no such news group");

       }

       else

       {

         conn.setCurrentGroup(group);

         conn.println("211 " + group.getPostingsCount() + " " + group.getFirstArticleNumber()

           + " " + group.getLastArticleNumber() + " " + group.getName() + " group selected");

       }

     }

     else

     {

       conn.println("500 no group name given");

     }

   }

 }