| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.ftpserver.command.impl; |
| |
| import java.io.IOException; |
| |
| import org.apache.ftpserver.command.AbstractCommand; |
| import org.apache.ftpserver.ftplet.FtpReply; |
| import org.apache.ftpserver.ftplet.FtpRequest; |
| import org.apache.ftpserver.impl.FtpIoSession; |
| import org.apache.ftpserver.impl.FtpServerContext; |
| import org.apache.ftpserver.impl.LocalizedFtpReply; |
| import org.apache.ftpserver.message.MessageResource; |
| |
| /** |
| * <strong>Internal class, do not use directly.</strong> |
| * |
| * <code>HELP [<SP> <string>] <CRLF></code><br> |
| * |
| * This command shall cause the server to send helpful information regarding its |
| * implementation status over the control connection to the user. The command |
| * may take an argument (e.g., any command name) and return more specific |
| * information as a response. |
| * |
| * @author <a href="http://mina.apache.org">Apache MINA Project</a> |
| */ |
| public class HELP extends AbstractCommand { |
| |
| /** |
| * Execute command. |
| */ |
| public void execute(final FtpIoSession session, |
| final FtpServerContext context, final FtpRequest request) |
| throws IOException { |
| |
| // reset state variables |
| session.resetState(); |
| |
| // print global help |
| if (!request.hasArgument()) { |
| session.write(LocalizedFtpReply.translate(session, request, context, |
| FtpReply.REPLY_214_HELP_MESSAGE, null, null)); |
| return; |
| } |
| |
| // print command specific help if available |
| String ftpCmd = request.getArgument().toUpperCase(); |
| MessageResource resource = context.getMessageResource(); |
| if (resource.getMessage(FtpReply.REPLY_214_HELP_MESSAGE, ftpCmd, |
| session.getLanguage()) == null) { |
| ftpCmd = null; |
| } |
| session.write(LocalizedFtpReply.translate(session, request, context, |
| FtpReply.REPLY_214_HELP_MESSAGE, ftpCmd, null)); |
| } |
| } |