diff -r 6ae5e4f8329b -r c404a87db5b7 src/org/sonews/daemon/command/NextPrevCommand.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/sonews/daemon/command/NextPrevCommand.java	Sun Aug 29 17:43:58 2010 +0200
@@ -0,0 +1,116 @@
+/*
+ *   SONEWS 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 org.sonews.daemon.command;
+
+import java.io.IOException;
+import org.sonews.daemon.NNTPConnection;
+import org.sonews.storage.Article;
+import org.sonews.storage.Channel;
+import org.sonews.storage.StorageBackendException;
+
+/**
+ * Class handling the NEXT and LAST command.
+ * @author Christian Lins
+ * @author Dennis Schwerdel
+ * @since n3tpd/0.1
+ */
+public class NextPrevCommand implements Command
+{
+
+  @Override
+  public String[] getSupportedCommandStrings()
+  {
+    return new String[]{"NEXT", "PREV"};
+  }
+
+  @Override
+  public boolean hasFinished()
+  {
+    return true;
+  }
+
+  @Override
+  public String impliedCapability()
+  {
+    return null;
+  }
+
+  @Override
+  public boolean isStateful()
+  {
+    return false;
+  }
+
+  @Override
+  public void processLine(NNTPConnection conn, final String line, byte[] raw)
+    throws IOException, StorageBackendException
+  {
+    final Article currA = conn.getCurrentArticle();
+    final Channel currG = conn.getCurrentChannel();
+    
+    if (currA == null)
+    {
+      conn.println("420 no current article has been selected");
+      return;
+    }
+    
+    if (currG == null)
+    {
+      conn.println("412 no newsgroup selected");
+      return;
+    }
+    
+    final String[] command = line.split(" ");
+
+    if(command[0].equalsIgnoreCase("NEXT"))
+    {
+      selectNewArticle(conn, currA, currG, 1);
+    }
+    else if(command[0].equalsIgnoreCase("PREV"))
+    {
+      selectNewArticle(conn, currA, currG, -1);
+    }
+    else
+    {
+      conn.println("500 internal server error");
+    }
+  }
+  
+  private void selectNewArticle(NNTPConnection conn, Article article, Channel grp,
+    final int delta)
+    throws IOException, StorageBackendException
+  {
+    assert article != null;
+
+    article = grp.getArticle(grp.getIndexOf(article) + delta);
+
+    if(article == null)
+    {
+      conn.println("421 no next article in this group");
+    }
+    else
+    {
+      conn.setCurrentArticle(article);
+      conn.println("223 " + conn.getCurrentChannel().getIndexOf(article)
+                    + " " + article.getMessageID()
+                    + " article retrieved - request text separately");
+    }
+  }
+
+}