chris@1: /*
chris@1:  *   SONEWS News Server
chris@1:  *   see AUTHORS for the list of contributors
chris@1:  *
chris@1:  *   This program is free software: you can redistribute it and/or modify
chris@1:  *   it under the terms of the GNU General Public License as published by
chris@1:  *   the Free Software Foundation, either version 3 of the License, or
chris@1:  *   (at your option) any later version.
chris@1:  *
chris@1:  *   This program is distributed in the hope that it will be useful,
chris@1:  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
chris@1:  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
chris@1:  *   GNU General Public License for more details.
chris@1:  *
chris@1:  *   You should have received a copy of the GNU General Public License
chris@1:  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
chris@1:  */
chris@1: 
chris@1: package org.sonews.daemon.command;
chris@1: 
chris@1: import java.io.IOException;
chris@1: import org.sonews.daemon.NNTPConnection;
chris@1: 
chris@1: /**
chris@1:  * <pre>
cli@20:  *  The CAPABILITIES command allows a client to determine the
cli@20:  *  capabilities of the server at any given time.
chris@1:  *
cli@20:  *  This command MAY be issued at any time; the server MUST NOT require
cli@20:  *  it to be issued in order to make use of any capability. The response
cli@20:  *  generated by this command MAY change during a session because of
cli@20:  *  other state information (which, in turn, may be changed by the
cli@20:  *  effects of other commands or by external events).  An NNTP client is
cli@20:  *  only able to get the current and correct information concerning
cli@20:  *  available capabilities at any point during a session by issuing a
cli@20:  *  CAPABILITIES command at that point of that session and processing the
cli@20:  *  response.
chris@1:  * </pre>
chris@1:  * @author Christian Lins
chris@1:  * @since sonews/0.5.0
chris@1:  */
chris@3: public class CapabilitiesCommand implements Command
chris@1: {
chris@1: 
chris@3:   static final String[] CAPABILITIES = new String[]
chris@1:     {
chris@1:       "VERSION 2", // MUST be the first one; VERSION 2 refers to RFC3977
chris@1:       "READER",    // Server implements commands for reading
chris@1:       "POST",      // Server implements POST command
chris@1:       "OVER"       // Server implements OVER command
chris@1:     };
chris@3: 
chris@3:   @Override
chris@3:   public String[] getSupportedCommandStrings()
chris@1:   {
chris@3:     return new String[] {"CAPABILITIES"};
chris@1:   }
chris@1: 
chris@1:   /**
chris@1:    * First called after one call to processLine().
chris@1:    * @return
chris@1:    */
chris@1:   @Override
chris@1:   public boolean hasFinished()
chris@1:   {
chris@1:     return true;
chris@1:   }
chris@1: 
chris@1:   @Override
cli@20:   public String impliedCapability()
cli@20:   {
cli@20:     return null;
cli@20:   }
cli@20:   
cli@20:   @Override
chris@3:   public boolean isStateful()
chris@3:   {
chris@3:     return false;
chris@3:   }
chris@3: 
chris@3:   @Override
chris@3:   public void processLine(NNTPConnection conn, final String line, byte[] raw)
chris@1:     throws IOException
chris@1:   {
chris@3:     conn.println("101 Capabilities list:");
chris@1:     for(String cap : CAPABILITIES)
chris@1:     {
chris@3:       conn.println(cap);
chris@1:     }
chris@3:     conn.println(".");
chris@1:   }
chris@1: 
chris@1: }