/*

 *   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;

  }

}