/*

  *   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 java.sql.SQLException;

 import org.sonews.daemon.NNTPConnection;

 /**

  * <pre>

  *   XPAT header range|<message-id> pat [pat...]

  *

  *   The XPAT command is used to retrieve specific headers from

  *   specific articles, based on pattern matching on the contents of

  *   the header. This command was first available in INN.

  *

  *   The required header parameter is the name of a header line (e.g.

  *   "subject") in a news group article. See RFC-1036 for a list

  *   of valid header lines. The required range argument may be

  *   any of the following:

  *               an article number

  *               an article number followed by a dash to indicate

  *                  all following

  *               an article number followed by a dash followed by

  *                  another article number

  *

  *   The required message-id argument indicates a specific

  *   article. The range and message-id arguments are mutually

  *   exclusive. At least one pattern in wildmat must be specified

  *   as well. If there are additional arguments the are joined

  *   together separated by a single space to form one complete

  *   pattern. Successful responses start with a 221 response

  *   followed by a the headers from all messages in which the

  *   pattern matched the contents of the specified header line. This

  *   includes an empty list. Once the output is complete, a period

  *   is sent on a line by itself. If the optional argument is a

  *   message-id and no such article exists, the 430 error response

  *   is returned. A 502 response will be returned if the client only

  *   has permission to transfer articles.

  *

  *   Responses

  *

  *       221 Header follows

  *       430 no such article

  *       502 no permission

  * </pre>

  * [Source:"draft-ietf-nntp-imp-02.txt"] [Copyright: 1998 S. Barber]

  * 

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class XPatCommand extends AbstractCommand

 {

   public XPatCommand(final NNTPConnection conn)

   {

     super(conn);

   }

   @Override

   public boolean hasFinished()

   {

     return true;

   }

   @Override

   public void processLine(final String line) 

     throws IOException, SQLException

   {

     printStatus(500, "not (yet) supported");

   }

 }