/*

  *   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;

 /**

  * <pre>

  *  The CAPABILITIES command allows a client to determine the

  *  capabilities of the server at any given time.

  *

  *  This command MAY be issued at any time; the server MUST NOT require

  *  it to be issued in order to make use of any capability. The response

  *  generated by this command MAY change during a session because of

  *  other state information (which, in turn, may be changed by the

  *  effects of other commands or by external events).  An NNTP client is

  *  only able to get the current and correct information concerning

  *  available capabilities at any point during a session by issuing a

  *  CAPABILITIES command at that point of that session and processing the

  *  response.

  * </pre>

  * @author Christian Lins

  * @since sonews/0.5.0

  */

 public class CapabilitiesCommand implements Command

 {

   static final String[] CAPABILITIES = new String[]

     {

       "VERSION 2", // MUST be the first one; VERSION 2 refers to RFC3977

       "READER",    // Server implements commands for reading

       "POST",      // Server implements POST command

       "OVER"       // Server implements OVER command

     };

   @Override

   public String[] getSupportedCommandStrings()

   {

     return new String[] {"CAPABILITIES"};

   }

   /**

    * First called after one call to processLine().

    * @return

    */

   @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

   {

     conn.println("101 Capabilities list:");

     for(String cap : CAPABILITIES)

     {

       conn.println(cap);

     }

     conn.println(".");

   }

 }