org/sonews/daemon/command/NextPrevCommand.java
author chris <chris@marvin>
Wed, 01 Jul 2009 10:48:22 +0200
changeset 2 1090e2141798
parent 1 6fceb66e1ad7
child 3 2fdc9cc89502
permissions -rw-r--r--
sonews/0.5.1 fixes merged
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/*
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 *   SONEWS News Server
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 *   see AUTHORS for the list of contributors
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 *
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 *   This program is free software: you can redistribute it and/or modify
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 *   it under the terms of the GNU General Public License as published by
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 *   the Free Software Foundation, either version 3 of the License, or
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 *   (at your option) any later version.
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 *
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 *   This program is distributed in the hope that it will be useful,
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 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *   GNU General Public License for more details.
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 *
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 *   You should have received a copy of the GNU General Public License
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 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 */
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package org.sonews.daemon.command;
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import java.io.IOException;
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import java.sql.SQLException;
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import org.sonews.daemon.NNTPConnection;
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import org.sonews.daemon.storage.Article;
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import org.sonews.daemon.storage.Group;
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/**
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 * Class handling the NEXT and LAST command.
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 * @author Christian Lins
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 * @author Dennis Schwerdel
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 * @since n3tpd/0.1
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 */
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public class NextPrevCommand extends AbstractCommand
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{
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  public NextPrevCommand(final NNTPConnection conn)
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  {
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    super(conn);
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  }
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  @Override
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  public boolean hasFinished()
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  {
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    return true;
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  }
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  @Override
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  public void processLine(final String line)
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    throws IOException, SQLException
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  {
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    final Article currA = getCurrentArticle();
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    final Group   currG = getCurrentGroup();
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    if (currA == null)
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    {
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      printStatus(420, "no current article has been selected");
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      return;
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    }
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    if (currG == null)
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    {
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      printStatus(412, "no newsgroup selected");
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      return;
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    }
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    final String[] command = line.split(" ");
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    if(command[0].equalsIgnoreCase("NEXT"))
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    {
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      selectNewArticle(currA, currG, 1);
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    }
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    else if(command[0].equalsIgnoreCase("PREV"))
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    {
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      selectNewArticle(currA, currG, -1);
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    }
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    else
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    {
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      printStatus(500, "internal server error");
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    }
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  }
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  private void selectNewArticle(Article article, Group grp, final int delta)
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    throws IOException, SQLException
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  {
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    assert article != null;
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    article = Article.getByArticleNumber(article.getIndexInGroup(grp) + delta, grp);
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    if(article == null)
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    {
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      printStatus(421, "no next article in this group");
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    }
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    else
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    {
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      setCurrentArticle(article);
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      printStatus(223, article.getIndexInGroup(getCurrentGroup()) + " " + article.getMessageID() + " article retrieved - request text separately");
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    }
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  }
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}