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