KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > apache > james > transport > mailets > GenericListservManager


1 /***********************************************************************
2  * Copyright (c) 2000-2004 The Apache Software Foundation. *
3  * All rights reserved. *
4  * ------------------------------------------------------------------- *
5  * Licensed under the Apache License, Version 2.0 (the "License"); you *
6  * may not use this file except in compliance with the License. You *
7  * may obtain a copy of the License at: *
8  * *
9  * http://www.apache.org/licenses/LICENSE-2.0 *
10  * *
11  * Unless required by applicable law or agreed to in writing, software *
12  * distributed under the License is distributed on an "AS IS" BASIS, *
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or *
14  * implied. See the License for the specific language governing *
15  * permissions and limitations under the License. *
16  ***********************************************************************/
17
18 package org.apache.james.transport.mailets;
19
20 import org.apache.mailet.GenericMailet;
21 import org.apache.mailet.Mail;
22 import org.apache.mailet.MailAddress;
23
24 import javax.mail.MessagingException JavaDoc;
25
26 /**
27  * An abstract implementation of a listserv manager. This mailet reads the
28  * address to find the command.
29  */
30 public abstract class GenericListservManager extends GenericMailet {
31
32     /**
33      * Adds an address to the listserv. Returns whether command was
34      * successful.
35      */
36     public abstract boolean addAddress(MailAddress address);
37
38     /**
39      * Removes an address from the listserv. Returns whether command
40      * was successful.
41      */
42     public abstract boolean removeAddress(MailAddress address);
43
44
45     /**
46      * Indicates whether an address already exists on the listserv. Returns
47      * whether the address exists.
48      */
49     public abstract boolean existsAddress(MailAddress address);
50
51     /**
52      * Processes the message. Checks which command was sent based on the
53      * recipient address, and does the appropriate action.
54      */
55     public final void service(Mail mail) throws MessagingException JavaDoc {
56         if (mail.getRecipients().size() != 1) {
57             getMailetContext().bounce(mail, "You can only send one command at a time to this listserv manager.");
58             return;
59         }
60         MailAddress address = (MailAddress)mail.getRecipients().iterator().next();
61         if (address.getUser().endsWith("-off")) {
62             if (existsAddress(mail.getSender())) {
63                 if (removeAddress(mail.getSender())) {
64                     getMailetContext().bounce(mail, "Successfully removed from listserv.");
65                 } else {
66                     getMailetContext().bounce(mail, "Unable to remove you from listserv for some reason.");
67                 }
68             } else {
69                 getMailetContext().bounce(mail, "You are not subscribed to this listserv.");
70             }
71         } else if (address.getUser().endsWith("-on")) {
72             if (existsAddress(mail.getSender())) {
73                 getMailetContext().bounce(mail, "You are already subscribed to this listserv.");
74             } else {
75                 if (addAddress(mail.getSender())) {
76                     getMailetContext().bounce(mail, "Successfully added to listserv.");
77                 } else {
78                     getMailetContext().bounce(mail, "Unable to add you to the listserv for some reason");
79                 }
80             }
81         } else {
82             getMailetContext().bounce(mail, "Could not understand the command you sent to this listserv manager.\r\n"
83                                       + "Valid commands are <listserv>-on@domain.com and <listserv>-off@domain.com");
84         }
85         //Kill the command message
86 mail.setState(Mail.GHOST);
87     }
88 }
89
Popular Tags