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1
4 package demo.chatter;
5
6 import java.util.HashMap  ;
7 import java.util.List ;
8 import java.util.Map ;
9 import java.util.Vector ;
10 import javax.swing.DefaultListModel ;
11
12
17 class ChatManager {
18 private transient ChatListener listener;
19
20 private List messages;
21
22 private DefaultListModel listModel;
23
24 private Map map;
25
26 public ChatManager() {
27 listModel = new DefaultListModel ();
28 messages = new Vector ();
29 map = new HashMap ();
30 }
31
32 public Message[] getMessages() {
33 return (Message[]) messages.toArray(new Message[0]);
34 }
35
36 public Object [] getCurrentUsers() {
37 synchronized (listModel) {
38 return listModel.toArray();
39 }
40 }
41
42 public void send(User user, String message) {
43 Message msg = new Message(user, message);
44 synchronized (messages) {
45 messages.add(msg);
46 }
47 sendNewMessageEvent(msg);
48 }
49
50 public void registerUser(User user) {
51 this.listener = user;
52 synchronized (listModel) {
53 listModel.addElement(user);
54 map.put(user.getNodeId(), user);
55 }
56 sendNewUserEvent(user.getName());
57 }
58
59 public String removeUser(String nodeId) {
60 synchronized (listModel) {
61 if (map.containsKey(nodeId)) {
62 User removedUser = (User) map.get(nodeId);
63 listModel.removeElement(removedUser);
64 return removedUser.getName();
65 }
66 else {
67 return "";
68 }
69 }
70 }
71
72 private synchronized void sendNewUserEvent(String username) {
73 this.listener.newUser(username);
74 }
75
76 private synchronized void sendNewMessageEvent(Message message) {
77 this.listener.newMessage(message);
78 }
79 }
80 |
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