consolecommandhandler.java

Java Mail Server JAVA编写的邮件服务器

/****************************************************************
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.     *
 *                                                              *
 * Copyright 2008 Jun Li(SiChuan University, the School of      *
 * Software Engineering). All rights reserved.                  *
 *                                                              *
 * Licensed to the JMS under one  or more contributor license   *
 * agreements.  See the LICENCE file  distributed with this     *
 * work for additional information regarding copyright          *
 * ownership.  The JMS licenses this file  you may not use this *
 * file except in compliance  with the License.                 *
 *                                                              *
 * 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.jpxx.mail.plugin.console.command;

import java.util.HashMap;
import org.jpxx.mail.Service.CommandHandler;
import org.jpxx.mail.Service.CommandsHandler;
import org.jpxx.mail.Service.Session;
import org.jpxx.mail.plugin.console.ConsoleStates;

/**
 * Console CommandHandler Handler.
 * This Class parses Console commands.
 * 
 * @author Jun Li
 * @version $Revision: 0.0.3 $, $Date: 2008/10/25 $
 * 
 */
public class ConsoleCommandHandler implements CommandsHandler, ConsoleStates {

    private static HashMap map = null;
    
    private static ConsoleCommandHandler singletonInstance = null;
    
    private ConsoleCommandHandler(){
        map = new HashMap();
        map.put("VRFY", VrfyCommand.class.getName());
        map.put("USER", UserCommand.class.getName());
        map.put("ADMI", AdmiCommand.class.getName());
        map.put("DOMN", DomnCommand.class.getName());
        map.put("CONF", ConfCommand.class.getName());
        map.put("LOGS", LogsCommand.class.getName());
        map.put("QUIT", QuitCommand.class.getName());
        map.put("SERV", ServCommand.class.getName());
    }
    
    /**
     * 
     * @since JMS 0.0.3
     * @return single instance of ConsoleCommandsHandler
     */
    public static ConsoleCommandHandler getSingletonInstance(){
        if(singletonInstance==null){
            singletonInstance = new ConsoleCommandHandler();
        }        
        return singletonInstance;
    }
    
    /**
     * Do with Console CommandHandler
     * 
     * @since JMS 0.0.3
     * @param name Command name
     * @param session
     */
    public void doCommand(String name, Session session) {
        if (name == null) {
            // Quit
            session.setLastAction(UPDATE);
            session.writeResponse("100 Closing transmission channel");
            return;
        }
        
        // Get the operation class name, include package name    
        name = name.trim();
        Object className = map.get(name);
        
        try {
            CommandHandler command = (CommandHandler) Class.forName(
                    className.toString()).newInstance();
            command.onCommand(session);
        } catch (Exception e) {
            CommandHandler command = new UnknownCommand();
            command.onCommand(session);
        }
    }

}