org/sonews/daemon/command/NextPrevCommand.java
author chris <chris@marvin>
Fri, 26 Jun 2009 16:48:50 +0200
changeset 1 6fceb66e1ad7
child 3 2fdc9cc89502
permissions -rw-r--r--
Hooray... sonews/0.5.0 final

HG: Enter commit message. Lines beginning with 'HG:' are removed.
HG: Remove all lines to abort the collapse operation.
chris@1
     1
/*
chris@1
     2
 *   SONEWS News Server
chris@1
     3
 *   see AUTHORS for the list of contributors
chris@1
     4
 *
chris@1
     5
 *   This program is free software: you can redistribute it and/or modify
chris@1
     6
 *   it under the terms of the GNU General Public License as published by
chris@1
     7
 *   the Free Software Foundation, either version 3 of the License, or
chris@1
     8
 *   (at your option) any later version.
chris@1
     9
 *
chris@1
    10
 *   This program is distributed in the hope that it will be useful,
chris@1
    11
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@1
    12
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@1
    13
 *   GNU General Public License for more details.
chris@1
    14
 *
chris@1
    15
 *   You should have received a copy of the GNU General Public License
chris@1
    16
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@1
    17
 */
chris@1
    18
chris@1
    19
package org.sonews.daemon.command;
chris@1
    20
chris@1
    21
import java.io.IOException;
chris@1
    22
import java.sql.SQLException;
chris@1
    23
import org.sonews.daemon.NNTPConnection;
chris@1
    24
import org.sonews.daemon.storage.Article;
chris@1
    25
import org.sonews.daemon.storage.Group;
chris@1
    26
chris@1
    27
/**
chris@1
    28
 * Class handling the NEXT and LAST command.
chris@1
    29
 * @author Christian Lins
chris@1
    30
 * @author Dennis Schwerdel
chris@1
    31
 * @since n3tpd/0.1
chris@1
    32
 */
chris@1
    33
public class NextPrevCommand extends AbstractCommand
chris@1
    34
{
chris@1
    35
chris@1
    36
  public NextPrevCommand(final NNTPConnection conn)
chris@1
    37
  {
chris@1
    38
    super(conn);
chris@1
    39
  }
chris@1
    40
chris@1
    41
  @Override
chris@1
    42
  public boolean hasFinished()
chris@1
    43
  {
chris@1
    44
    return true;
chris@1
    45
  }
chris@1
    46
chris@1
    47
  @Override
chris@1
    48
  public void processLine(final String line)
chris@1
    49
    throws IOException, SQLException
chris@1
    50
  {
chris@1
    51
    final Article currA = getCurrentArticle();
chris@1
    52
    final Group   currG = getCurrentGroup();
chris@1
    53
    
chris@1
    54
    if (currA == null)
chris@1
    55
    {
chris@1
    56
      printStatus(420, "no current article has been selected");
chris@1
    57
      return;
chris@1
    58
    }
chris@1
    59
    
chris@1
    60
    if (currG == null)
chris@1
    61
    {
chris@1
    62
      printStatus(412, "no newsgroup selected");
chris@1
    63
      return;
chris@1
    64
    }
chris@1
    65
    
chris@1
    66
    final String[] command = line.split(" ");
chris@1
    67
chris@1
    68
    if(command[0].equalsIgnoreCase("NEXT"))
chris@1
    69
    {
chris@1
    70
      selectNewArticle(currA, currG, 1);
chris@1
    71
    }
chris@1
    72
    else if(command[0].equalsIgnoreCase("PREV"))
chris@1
    73
    {
chris@1
    74
      selectNewArticle(currA, currG, -1);
chris@1
    75
    }
chris@1
    76
    else
chris@1
    77
    {
chris@1
    78
      printStatus(500, "internal server error");
chris@1
    79
    }
chris@1
    80
  }
chris@1
    81
  
chris@1
    82
  private void selectNewArticle(Article article, Group grp, final int delta)
chris@1
    83
    throws IOException, SQLException
chris@1
    84
  {
chris@1
    85
    assert article != null;
chris@1
    86
chris@1
    87
    article = Article.getByArticleNumber(article.getIndexInGroup(grp) + delta, grp);
chris@1
    88
chris@1
    89
    if(article == null)
chris@1
    90
    {
chris@1
    91
      printStatus(421, "no next article in this group");
chris@1
    92
    }
chris@1
    93
    else
chris@1
    94
    {
chris@1
    95
      setCurrentArticle(article);
chris@1
    96
      printStatus(223, article.getIndexInGroup(getCurrentGroup()) + " " + article.getMessageID() + " article retrieved - request text separately");
chris@1
    97
    }
chris@1
    98
  }
chris@1
    99
chris@1
   100
}