factory.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;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.apache.log4j.Logger;
import org.apache.log4j.xml.DOMConfigurator;
import org.jpxx.mail.Config.Configuration;
import org.jpxx.mail.Config.XmlConfig;
import org.jpxx.mail.Exception.InvalidServiceException;
import org.jpxx.mail.Pop3.Pop3Server;
import org.jpxx.mail.Service.AbstractServer;
import org.jpxx.mail.Service.Server;
import org.jpxx.mail.Smtp.SmtpServer;
import org.jpxx.mail.plugin.console.ConsoleServer;

/**
 * This is a Calss factory to create instance of some classes.
 * 
 * @author Jun Li
 * @version $Revision: 0.0.3 $, $Date: 2008/05/20 $
 * @since JMS 0.0.1
 */
public class Factory {

    private static Factory singletonInstance = null;

    /**
     * Gets a singleton instance of Factory.
     * @since JMS 0.0.1
     * @return a singleton instance of Factory
     */
    public static Factory getSingletonInstance() {
        if (singletonInstance == null) {
            // Creates a instance.
            singletonInstance = new Factory();
        }
        return singletonInstance;
    }

    private Factory() {
        init();
    }

    /**   
     * Creates an instance of <tt>Server<tt>.
     * 
     * <p>This function needs to make better.</p>
     * 
     * @deprecated NEED IMPROVE
     * 
     * @since JMS 0.0.1
     * @param serviceName Such as "SMTP", "POP3"
     * @return the object of Server. if this is no service found, return null.
     * @throws org.jpxx.mail.Exception.InvalidServiceException
     */
    public Server getServer(String serviceName) throws InvalidServiceException {
        if (serviceName == null) {
            throw new InvalidServiceException("Service Name is NULL");
        }
        AbstractServer server = null;
        if (serviceName.toUpperCase().equals("SMTP")) {
            server = SmtpServer.getSingletonInstance();
        } else if (serviceName.toUpperCase().equals("POP") ||
                serviceName.toUpperCase().equals("POP3")) {
            server = Pop3Server.getSingletonInstance();
        } else if (serviceName.toUpperCase().equals("CONSOLE") ||
                serviceName.toUpperCase().equals("CONSOLE")) {
            server = ConsoleServer.getSingletonInstance();
        }

        if (server != null) {
            return server;
        } else {
            throw new InvalidServiceException("Service Name Not found");
        }
    }

    /**
     * Creates an instance of <tt>Configuration<tt>.
     * @since JMS 0.0.1
     * @return an instance of XmlConfig.
     */
    public Configuration getConfiguration() {
        return new XmlConfig(Constants.CONFIG_FILE_PATH);
    }

    /**
     * Creates an instance of <tt>org.apache.log4j.Logger<tt>.
     * @param className The class you will write log.
     * @since JMS 0.0.1
     * @return Logger instance.
     */
    public Logger getLogger(String className) {
        return Logger.getLogger(className);
    }

    /**
     * Creates an instance of <tt>org.apache.log4j.Logger<tt>.
     * @since JMS 0.0.1
     * @param o The class you will write log.
     * @return Logger instance.
     */
    public Logger getLogger(Object o) {
        return getLogger(o.getClass().getName());
    }

    // <editor-fold defaultstate="collapsed" desc="Initialization"> 
    /**
     * Initials JMS config. Does someting before JMS started.
     * 
     * @since JMS 0.0.1
     */
    private void init() {
        File f = new File(Constants.LOG4J_FILE_PATH);
        if (!f.exists()) {
            try {
                String p = f.getAbsolutePath();
                String dir = p.substring(0, p.lastIndexOf(File.separator));
                new File(dir).mkdirs();
                f.createNewFile();

                StringBuilder s = new StringBuilder();
                s.append("<?xml version=\"1.0\" encoding=\"UTF-8\" ?>\r\n");
                s.append("<!DOCTYPE log4j:configuration SYSTEM \"log4j.dtd\">\r\n");
                s.append("<log4j:configuration xmlns:log4j=\"http://jakarta.apache.org/log4j/\">\r\n");
                s.append("\r\n");
                s.append("  <appender name=\"rollingFileAppender\" class=\"org.apache.log4j.RollingFileAppender\">\r\n");
                s.append("      <param name=\"Threshold\" value=\"ALL\"/>\r\n");
                s.append("      <param name=\"File\" value=\"" + Constants.LOG_FILE_PATH + "\" />\r\n");
                s.append("      <param name=\"Append\" value=\"true\" />\r\n");
                s.append("      <param name=\"MaxFileSize\" value=\"1024KB\" />\r\n");
                s.append("      <layout class=\"org.apache.log4j.PatternLayout\">\r\n");
                s.append("          <!--<param name=\"ConversionPattern\" value=\"%d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n\" />-->\r\n");
                s.append("          <param name=\"ConversionPattern\" value=\"[%d{yyyy-MM-dd HH:mm:ss}] %m%n\" />\r\n");
                s.append("      </layout>\r\n");
                s.append("  </appender>\r\n");
                s.append("\r\n");
                s.append("  <appender name=\"dailyRollingFileAppender\" class=\"org.apache.log4j.DailyRollingFileAppender\">\r\n");
                s.append("      <param name=\"Threshold\" value=\"ALL\"/>\r\n");
                s.append("      <param name=\"File\" value=\"" + Constants.LOG_FILE_PATH + "\" />\r\n");
                s.append("      <param name=\"Append\" value=\"false\" />\r\n");
                s.append("      <param name=\"DatePattern\" value=\"'.'yyyy-MM-dd'.log'\" />\r\n");
                s.append("      <layout class=\"org.apache.log4j.PatternLayout\">\r\n");
                s.append("          <param name=\"ConversionPattern\" value=\"%d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n\" />\r\n");
                s.append("      </layout>\r\n");
                s.append("  </appender>\r\n");
                s.append("\r\n");
                s.append("  <appender name=\"STDOUT\" class=\"org.apache.log4j.ConsoleAppender\">\r\n");
                s.append("      <param name=\"Target\" value=\"System.out\" />\r\n");
                s.append("      <layout class=\"org.apache.log4j.PatternLayout\">\r\n");
                s.append("          <param name=\"ConversionPattern\" value=\"%d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n\" />\r\n");
                s.append("      </layout>\r\n");
                s.append("      <filter class=\"org.apache.log4j.varia.LevelRangeFilter\">\r\n");
                s.append("          <param name=\"LevelMin\" value=\"DEBUG\"/>\r\n");
                s.append("          <param name=\"LevelMax\" value=\"INFO\"/>\r\n");
                s.append("      </filter>\r\n");
                s.append("  </appender>\r\n");
                s.append("\r\n");
                s.append("\r\n");
                s.append("  <appender name=\"STDERR\" class=\"org.apache.log4j.ConsoleAppender\">\r\n");
                s.append("      <param name=\"Target\" value=\"System.err\" />\r\n");
                s.append("      <layout class=\"org.apache.log4j.PatternLayout\">\r\n");
                s.append("          <param name=\"ConversionPattern\" value=\"%d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n\" />\r\n");
                s.append("      </layout>\r\n");
                s.append("      <filter class=\"org.apache.log4j.varia.LevelRangeFilter\">\r\n");
                s.append("          <param name=\"LevelMin\" value=\"WARN\"/>\r\n");
                s.append("          <param name=\"LevelMax\" value=\"FATAL\"/>\r\n");
                s.append("      </filter>\r\n");
                s.append("  </appender>\r\n");
                s.append("\r\n");
                s.append("\r\n");
                s.append("  <logger name=\"org.jpxx.mail\" additivity=\"true\">\r\n");
                s.append("      <appender-ref ref=\"rollingFileAppender\" />\r\n");
                s.append("  </logger>\r\n");
                s.append("  <root>\r\n");
                s.append("      <level value=\"all\" />\r\n");
                s.append("      <appender-ref ref=\"STDOUT\" />\r\n");
                s.append("      <appender-ref ref=\"STDERR\" />\r\n");
                s.append("  </root>\r\n");
                s.append("</log4j:configuration>\r\n");

                FileOutputStream fos = new FileOutputStream(f);
                Writer out = new OutputStreamWriter(fos, "UTF-8");
                out.write(s.toString());
                out.close();
            } catch (IOException ex) {
            }
        }

        DOMConfigurator.configure(Constants.LOG4J_FILE_PATH);
        /**
         * Check temp dir exist or not.
         */
        f = new File(Constants.TEMP_DIR);
        if (!f.exists()) {
            f.mkdirs();
        }
    }
    // </editor-fold>
}