/*

  *   StarOffice 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 com.so.news.command;

 import java.io.IOException;

 import com.so.news.NNTPConnection;

 import com.so.news.storage.Article;

 import com.so.news.storage.Group;

 /**

  * Class handling the NEXT and LAST command.

  * @author Christian Lins

  * @author Dennis Schwerdel

  */

 public class NextCommand extends Command

 {

   public NextCommand(NNTPConnection conn)

   {

     super(conn);

   }

   public boolean process(String[] command) throws IOException

   {

     String commandName = command[0];

     if (!(commandName.equalsIgnoreCase("NEXT") || commandName

         .equalsIgnoreCase("LAST")))

       return false;

     // untested, RFC977 complient

     Article currA = getCurrentArticle();

     Group currG = getCurrentGroup();

     if (currA == null)

     {

       printStatus(420, "no current article has been selected");

       return true;

     }

     if (currG == null)

     {

       printStatus(412, "no newsgroup selected");

       return true;

     }

     Article article;

     if (commandName.equalsIgnoreCase("NEXT"))

     {

       article = currA.nextArticleInGroup();

       if (article == null)

       {

         printStatus(421, "no next article in this group");

         return true;

       }

     }

     else

     {

       article = currA.prevArticleInGroup();

       if (article == null)

       {

         printStatus(422, "no previous article in this group");

         return true;

       }

     }

     setCurrentArticle(article);

     printStatus(223, article.getNumberInGroup() + " " + article.getMessageID()

         + " article retrieved - request text separately");

     return true;

   }

 }