genericlistservmanager.java

邮件服务器系统 支持SMTP POP3 是著名的Apache写 有一定的参考价值

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 * Copyright (c) 2000-2004 The Apache Software Foundation.             *
 * All rights reserved.                                                *
 * ------------------------------------------------------------------- *
 * Licensed 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.                      *
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package org.apache.james.transport.mailets;

import org.apache.mailet.GenericMailet;
import org.apache.mailet.Mail;
import org.apache.mailet.MailAddress;

import javax.mail.MessagingException;

/**
 * An abstract implementation of a listserv manager.  This mailet reads the
 * address to find the command.
 */
public abstract class GenericListservManager extends GenericMailet {

    /**
     * Adds an address to the listserv.  Returns whether command was
     * successful.
     */
    public abstract boolean addAddress(MailAddress address);

    /**
     * Removes an address from the listserv.  Returns whether command
     * was successful.
     */
    public abstract boolean removeAddress(MailAddress address);


    /**
     * Indicates whether an address already exists on the listserv. Returns
     * whether the address exists.
     */
    public abstract boolean existsAddress(MailAddress address);

    /**
     * Processes the message.  Checks which command was sent based on the
     * recipient address, and does the appropriate action.
     */
    public final void service(Mail mail) throws MessagingException {
        if (mail.getRecipients().size() != 1) {
            getMailetContext().bounce(mail, "You can only send one command at a time to this listserv manager.");
            return;
        }
        MailAddress address = (MailAddress)mail.getRecipients().iterator().next();
        if (address.getUser().endsWith("-off")) {
            if (existsAddress(mail.getSender())) {
                if (removeAddress(mail.getSender())) {
                    getMailetContext().bounce(mail, "Successfully removed from listserv.");
                } else {
                    getMailetContext().bounce(mail, "Unable to remove you from listserv for some reason.");
                }
            } else {
                getMailetContext().bounce(mail, "You are not subscribed to this listserv.");
            }
        } else if (address.getUser().endsWith("-on")) {
            if (existsAddress(mail.getSender())) {
                getMailetContext().bounce(mail, "You are already subscribed to this listserv.");
            } else {
                if (addAddress(mail.getSender())) {
                    getMailetContext().bounce(mail, "Successfully added to listserv.");
                } else {
                    getMailetContext().bounce(mail, "Unable to add you to the listserv for some reason");
                }
            }
        } else {
            getMailetContext().bounce(mail, "Could not understand the command you sent to this listserv manager.\r\n"
                                      + "Valid commands are <listserv>[e-mail] and <listserv>[e-mail]");
        }
        //Kill the command message
        mail.setState(Mail.GHOST);
    }
}