/*

 *   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");

  }

}