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 HELP command
037 */
038 public class HelpCmdHandler implements CommandHandler<SMTPSession> {
039 /**
040 * The name of the command handled by the command handler
041 */
042 private final static String COMMAND_NAME = "HELP";
043
044
045 /**
046 * handles HELP command
047 *
048 **/
049 public Response onCommand(SMTPSession session, Request request){
050 return new SMTPResponse(SMTPRetCode.UNIMPLEMENTED_COMMAND, DSNStatus.getStatus(DSNStatus.PERMANENT,DSNStatus.SYSTEM_NOT_CAPABLE)+" " + COMMAND_NAME + " is not supported");
051 }
052
053 /**
054 * @see org.apache.james.protocols.api.handler.CommandHandler#getImplCommands()
055 */
056 public Collection<String> getImplCommands() {
057 Collection<String> implCommands = new ArrayList<String>();
058 implCommands.add(COMMAND_NAME);
059
060 return implCommands;
061 }
062 }