org/sonews/daemon/command/ListCommand.java
author cli
Thu, 20 Aug 2009 14:31:19 +0200
changeset 12 bb6990c0dd1a
parent 3 2fdc9cc89502
child 17 4ae6ada7ea23
permissions -rw-r--r--
Merging fixes from sonews/1.0.3
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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.util.List;
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import org.sonews.daemon.NNTPConnection;
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import org.sonews.storage.Channel;
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import org.sonews.storage.StorageBackendException;
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/**
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 * Class handling the LIST 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 ListCommand implements Command
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{
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  @Override
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  public String[] getSupportedCommandStrings()
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  {
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    return new String[]{"LIST"};
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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 boolean isStateful()
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  {
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    return false;
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  }
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  @Override
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  public void processLine(NNTPConnection conn, final String line, byte[] raw)
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    throws IOException, StorageBackendException
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  {
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    final String[] command = line.split(" ");
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    if(command.length >= 2)
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    {
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      if(command[1].equalsIgnoreCase("OVERVIEW.FMT"))
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      {
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        conn.println("215 information follows");
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        conn.println("Subject:\nFrom:\nDate:\nMessage-ID:\nReferences:\nBytes:\nLines:\nXref");
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("NEWSGROUPS"))
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      {
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        conn.println("215 information follows");
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        final List<Channel> list = Channel.getAll();
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        for (Channel g : list)
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        {
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          conn.println(g.getName() + "\t" + "-");
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        }
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("SUBSCRIPTIONS"))
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      {
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        conn.println("215 information follows");
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("EXTENSIONS"))
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      {
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        conn.println("202 Supported NNTP extensions.");
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        conn.println("LISTGROUP");
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        conn.println("XDAEMON");
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        conn.println("XPAT");
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        conn.println(".");
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      }
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      else if(command[1].equalsIgnoreCase("ACTIVE"))
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      {
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        // TODO: Implement wildcards for LIST ACTIVE
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        printGroupInfo(conn);
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      }
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      else
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      {
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        conn.println("500 unknown argument to LIST command");
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      }
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    }
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    else
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    {
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      printGroupInfo(conn);
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    }
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  }
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  private void printGroupInfo(NNTPConnection conn)
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    throws IOException, StorageBackendException
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  {
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    final List<Channel> groups = Channel.getAll();
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    if (groups != null)
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    {
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      conn.println("215 list of newsgroups follows");
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      for (Channel g : groups)
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      {
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        if (!g.isDeleted())
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        {
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          String writeable = g.isWriteable() ? " y" : " n";
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          // Indeed first the higher article number then the lower
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          conn.println(g.getName() + " " + g.getLastArticleNumber() + " " + g.getFirstArticleNumber() + writeable);
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        }
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      }
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      conn.println(".");
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    }
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    else
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    {
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      conn.println("500 server database malfunction");
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    }
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  }
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}