chris@0: /*
chris@0:  *   StarOffice News Server
chris@0:  *   see AUTHORS for the list of contributors
chris@0:  *
chris@0:  *   This program is free software: you can redistribute it and/or modify
chris@0:  *   it under the terms of the GNU General Public License as published by
chris@0:  *   the Free Software Foundation, either version 3 of the License, or
chris@0:  *   (at your option) any later version.
chris@0:  *
chris@0:  *   This program is distributed in the hope that it will be useful,
chris@0:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@0:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@0:  *   GNU General Public License for more details.
chris@0:  *
chris@0:  *   You should have received a copy of the GNU General Public License
chris@0:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@0:  */
chris@0: 
chris@0: package com.so.news.command;
chris@0: 
chris@0: import java.io.IOException;
chris@0: import com.so.news.NNTPConnection;
chris@0: import com.so.news.storage.Article;
chris@0: import com.so.news.storage.Group;
chris@0: 
chris@0: /**
chris@0:  * Class handling the NEXT and LAST command.
chris@0:  * @author Christian Lins
chris@0:  * @author Dennis Schwerdel
chris@0:  */
chris@0: public class NextCommand extends Command
chris@0: {
chris@0:   public NextCommand(NNTPConnection conn)
chris@0:   {
chris@0:     super(conn);
chris@0:   }
chris@0: 
chris@0:   public boolean process(String[] command) throws IOException
chris@0:   {
chris@0:     String commandName = command[0];
chris@0:     if (!(commandName.equalsIgnoreCase("NEXT") || commandName
chris@0:         .equalsIgnoreCase("LAST")))
chris@0:       return false;
chris@0:     // untested, RFC977 complient
chris@0:     Article currA = getCurrentArticle();
chris@0:     Group currG = getCurrentGroup();
chris@0:     if (currA == null)
chris@0:     {
chris@0:       printStatus(420, "no current article has been selected");
chris@0:       return true;
chris@0:     }
chris@0:     if (currG == null)
chris@0:     {
chris@0:       printStatus(412, "no newsgroup selected");
chris@0:       return true;
chris@0:     }
chris@0:     Article article;
chris@0:     if (commandName.equalsIgnoreCase("NEXT"))
chris@0:     {
chris@0:       article = currA.nextArticleInGroup();
chris@0:       if (article == null)
chris@0:       {
chris@0:         printStatus(421, "no next article in this group");
chris@0:         return true;
chris@0:       }
chris@0:     }
chris@0:     else
chris@0:     {
chris@0:       article = currA.prevArticleInGroup();
chris@0:       if (article == null)
chris@0:       {
chris@0:         printStatus(422, "no previous article in this group");
chris@0:         return true;
chris@0:       }
chris@0:     }
chris@0:     setCurrentArticle(article);
chris@0:     printStatus(223, article.getNumberInGroup() + " " + article.getMessageID()
chris@0:         + " article retrieved - request text separately");
chris@0:     return true;
chris@0:   }
chris@0: 
chris@0: }