001    /****************************************************************
002     * Licensed to the Apache Software Foundation (ASF) under one   *
003     * or more contributor license agreements.  See the NOTICE file *
004     * distributed with this work for additional information        *
005     * regarding copyright ownership.  The ASF licenses this file   *
006     * to you under the Apache License, Version 2.0 (the            *
007     * "License"); you may not use this file except in compliance   *
008     * with the License.  You may obtain a copy of the License at   *
009     *                                                              *
010     *   http://www.apache.org/licenses/LICENSE-2.0                 *
011     *                                                              *
012     * Unless required by applicable law or agreed to in writing,   *
013     * software distributed under the License is distributed on an  *
014     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
015     * KIND, either express or implied.  See the License for the    *
016     * specific language governing permissions and limitations      *
017     * under the License.                                           *
018     ****************************************************************/
019    
020    
021    
022    package org.apache.james.protocols.smtp.core;
023    
024    import java.util.ArrayList;
025    import java.util.Collection;
026    
027    import org.apache.james.protocols.api.Request;
028    import org.apache.james.protocols.api.Response;
029    import org.apache.james.protocols.api.handler.CommandHandler;
030    import org.apache.james.protocols.smtp.SMTPResponse;
031    import org.apache.james.protocols.smtp.SMTPRetCode;
032    import org.apache.james.protocols.smtp.SMTPSession;
033    import org.apache.james.protocols.smtp.dsn.DSNStatus;
034    
035    /**
036      * Handles EXPN command
037      */
038    public class ExpnCmdHandler implements CommandHandler<SMTPSession> {
039    
040        /**
041         * The name of the command handled by the command handler
042         */
043        private final static String COMMAND_NAME = "EXPN";
044        
045        /**
046         * Handler method called upon receipt of a EXPN command.
047         * This method informs the client that the command is
048         * not implemented.
049         *
050         */
051        public Response onCommand(SMTPSession session, Request request) {
052            return new SMTPResponse(SMTPRetCode.UNIMPLEMENTED_COMMAND, DSNStatus.getStatus(DSNStatus.PERMANENT,DSNStatus.SYSTEM_NOT_CAPABLE)+" EXPN is not supported");
053        }
054        
055        /**
056         * @see org.apache.james.protocols.api.handler.CommandHandler#getImplCommands()
057         */
058        public Collection<String> getImplCommands() {
059            Collection<String> implCommands = new ArrayList<String>();
060            implCommands.add(COMMAND_NAME);
061            
062            return implCommands;
063        }
064    
065    }