logscommand.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.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import org.jpxx.mail.Constants;
import org.jpxx.mail.Exception.ArgumentException;
import org.jpxx.mail.Service.CommandHandler;
import org.jpxx.mail.Service.Session;
import org.jpxx.mail.plugin.console.ConsoleStates;

/**
 *
 * This command manages logs file.
 * 
 * Syntax:
 * LOGS <CRLF>
 * [String]
 * <CRLF>.<CRLF>
 * 
 * The log data is terminated by a line containing only a period, that 
 * is, the character sequence "<CRLF>.<CRLF>" . 
 * 
 * @author Jun Li
 * @version $Revision: 0.0.3 $, $Date: 2008/10/25 $
 * @since JMS 0.0.3
 */
public class LogsCommand implements CommandHandler, ConsoleStates {

    /**
     * @see org.jpxx.mail.Service.CommandHandler#onCommand(Session session)
     * @param session session The Session of Server and client
     */
    public void onCommand(Session session) {
        int state = session.getLastAction();

        if (state == AUTHENTICATION || state == TRANSACTION) {
            session.setLastAction(TRANSACTION);

            String action = null;
            try {
                action = session.getCommandLine().getArgument(0).toUpperCase().trim();
            } catch (ArgumentException ae) {
            }

            if (action == null || action.equals("")) {
                try {
                    StringBuffer buffer = new StringBuffer(64);
                    buffer.append(OK);
                    buffer.append(" ");
                    buffer.append("read log file.");
                    session.writeResponse(buffer.toString());

                    File f = new File(Constants.LOG_FILE_PATH);
                    BufferedReader br = new BufferedReader(new FileReader(f));
                    String line = br.readLine();
                    while (line != null) {
                        session.writeResponse(line);
                        line = br.readLine();
                    }
                    session.writeResponse(".");
                } catch (FileNotFoundException e) {
                    StringBuffer buffer = new StringBuffer(64);
                    buffer.append(ERR);
                    buffer.append(" ");
                    buffer.append("Log file not exist.");
                    session.writeResponse(buffer.toString());
                } catch (IOException e) {
                    StringBuffer buffer = new StringBuffer(64);
                    buffer.append(ERR);
                    buffer.append(" ");
                    buffer.append("Log file read error.");
                    session.writeResponse(buffer.toString());
                }
            } else if (action.equals("CLR")) {
                try {
                    File f = new File(Constants.LOG_FILE_PATH);
                    BufferedWriter bw = new BufferedWriter(new FileWriter(f));
                    bw.write("");
                    bw.close();
                    
                    StringBuffer buffer = new StringBuffer(64);
                    buffer.append(OK);
                    buffer.append(" ");
                    buffer.append("Clear logs");
                    session.writeResponse(buffer.toString());                    
                } catch (FileNotFoundException e) {
                    StringBuffer buffer = new StringBuffer(64);
                    buffer.append(ERR);
                    buffer.append(" ");
                    buffer.append("Log file not exist.");
                    session.writeResponse(buffer.toString());
                } catch (IOException e) {
                    StringBuffer buffer = new StringBuffer(64);
                    buffer.append(ERR);
                    buffer.append(" ");
                    buffer.append("Log file clear error.");
                    session.writeResponse(buffer.toString());
                }
                
            }


        } else {
            StringBuffer buffer = new StringBuffer(64);
            buffer.append(ERR);
            buffer.append(" ");
            buffer.append("LOGS not allowed here");
            session.writeResponse(buffer.toString());
        }

    }
}