/*

  *   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 java.util.List;

 import org.sonews.daemon.NNTPConnection;

 import org.sonews.storage.Channel;

 import org.sonews.storage.StorageBackendException;

 /**

  * Class handling the LISTGROUP command.

  * @author Christian Lins

  * @author Dennis Schwerdel

  * @since n3tpd/0.1

  */

 public class ListGroupCommand implements Command

 {

   @Override

   public String[] getSupportedCommandStrings()

   {

     return new String[]{"LISTGROUP"};

   }

   @Override

   public boolean hasFinished()

   {

     return true;

   }

   @Override

   public String impliedCapability()

   {

     return null;

   }

   @Override

   public boolean isStateful()

   {

     return false;

   }

   @Override

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

     throws IOException, StorageBackendException

   {

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

     Channel group;

     if(command.length >= 2)

     {

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

     }

     else

     {

       group = conn.getCurrentChannel();

     }

     if (group == null)

     {

       conn.println("412 no group selected; use GROUP <group> command");

       return;

     }

     List<Long> ids = group.getArticleNumbers();

     conn.println("211 " + ids.size() + " " +

       group.getFirstArticleNumber() + " " + 

       group.getLastArticleNumber() + " list of article numbers follow");

     for(long id : ids)

     {

       // One index number per line

       conn.println(Long.toString(id));

     }

     conn.println(".");

   }

 }