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Florian Schmaus eec0df386c s/JEP/XEP/ 
also s;jabber.org/jeps;xmpp.org/extensions;
2014-06-14 11:48:46 +02:00

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<html>
<head>
<title>Multi User Chat</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body>
<div class="header">Multi User Chat</div><p>
Allows configuration of, participation in, and administration of individual text-based conference rooms.<p>
<ul>
<li><a href="#create">Create a new Room</a></li>
<li><a href="#join">Join a room</a></li>
<li><a href="#invite">Manage room invitations</a></li>
<li><a href="#discomuc">Discover MUC support</a></li>
<li><a href="#discojoin">Discover joined rooms</a></li>
<li><a href="#discoroom">Discover room information</a></li>
<li><a href="#privchat">Start a private chat</a></li>
<li><a href="#subject">Manage changes on room subject</a></li>
<li><a href="#role">Manage role modifications</a></li>
<li><a href="#afiliation">Manage affiliation modifications</a></li>
</ul>
<b>XEP related:</b> <a href="http://www.xmpp.org/extensions/xep-0045.html">XEP-45</a>
<hr>
<div class="subheader"><a name="create">Create a new Room</a></div><p>
<b>Description</b><p>
Allowed users may create new rooms. There are two types of rooms that you can create. <b>Instant rooms</b>
which are available for immediate access and are automatically created based on some default
configuration and <b>Reserved rooms</b> which are manually configured by the room creator before
anyone is allowed to enter.</p>
<b>Usage</b><p>
In order to create a room you will need to first create an instance of <i><b>MultiUserChat</b></i>. The
room name passed to the constructor will be the name of the room to create. The next step is to send
<b>create(String nickname)</b> to the <i><b>MultiUserChat</b></i> instance where nickname is the nickname
to use when joining the room.</p><p>
Depending on the type of room that you want to create you will have to use different configuration forms. In
order to create an Instant room just send <b>sendConfigurationForm(Form form)</b> where form is an empty form.
But if you want to create a Reserved room then you should first get the room's configuration form, complete
the form and finally send it back to the server.</p>
<b>Examples</b><p>
In this example we can see how to create an instant room: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Create a MultiUserChat using a XMPPConnection for a room</font>
MultiUserChat muc = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
<font color="#3f7f5f">// Create the room</font>
muc.create(<font color="#0000FF">"testbot"</font>);
<font color="#3f7f5f">// Send an empty room configuration form which indicates that we want</font>
<font color="#3f7f5f">// an instant room</font>
muc.sendConfigurationForm(new Form(Form.TYPE_SUBMIT));
</pre>
</blockquote>
In this example we can see how to create a reserved room. The form is completed with default values: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Create a MultiUserChat using a XMPPConnection for a room</font>
MultiUserChat muc = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
<font color="#3f7f5f">// Create the room</font>
muc.create(<font color="#0000FF">"testbot"</font>);
<font color="#3f7f5f">// Get the the room's configuration form</font>
Form form = muc.getConfigurationForm();
<font color="#3f7f5f">// Create a new form to submit based on the original form</font>
Form submitForm = form.createAnswerForm();
<font color="#3f7f5f">// Add default answers to the form to submit</font>
for (Iterator fields = form.getFields(); fields.hasNext();) {
FormField field = (FormField) fields.next();
if (!FormField.TYPE_HIDDEN.equals(field.getType()) && field.getVariable() != null) {
<font color="#3f7f5f">// Sets the default value as the answer</font>
submitForm.setDefaultAnswer(field.getVariable());
}
}
<font color="#3f7f5f">// Sets the new owner of the room</font>
List owners = new ArrayList();
owners.add(<font color="#0000FF">"johndoe@jabber.org"</font>);
submitForm.setAnswer(<font color="#0000FF">"muc#roomconfig_roomowners"</font>, owners);
<font color="#3f7f5f">// Send the completed form (with default values) to the server to configure the room</font>
muc.sendConfigurationForm(submitForm);
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="join">Join a room</a></div><p>
<b>Description</b><p>
Your usual first step in order to send messages to a room is to join the room. Multi User Chat allows
to specify several parameter while joining a room. Basically you can control the amount of history to
receive after joining the room as well as provide your nickname within the room and a password if the
room is password protected.</p>
<b>Usage</b><p>
In order to join a room you will need to first create an instance of <i><b>MultiUserChat</b></i>. The
room name passed to the constructor will be the name of the room to join. The next step is to send
<b>join(...)</b> to the <i><b>MultiUserChat</b></i> instance. But first you will have to decide which
join message to send. If you want to just join the room without a password and without specifying the amount
of history to receive then you could use <b>join(String nickname)</b> where nickname if your nickname in
the room. In case the room requires a password in order to join you could then use
<b>join(String nickname, String password)</b>. And finally, the most complete way to join a room is to send
<b>join(String nickname, String password, DiscussionHistory history, long timeout)</b>
where nickname is your nickname in the room, , password is your password to join the room, history is
an object that specifies the amount of history to receive and timeout is the milliseconds to wait
for a response from the server.</p>
<b>Examples</b><p>
In this example we can see how to join a room with a given nickname: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Create a MultiUserChat using a XMPPConnection for a room</font>
MultiUserChat muc2 = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
<font color="#3f7f5f">// User2 joins the new room</font>
<font color="#3f7f5f">// The room service will decide the amount of history to send</font>
muc2.join(<font color="#0000FF">"testbot2"</font>);
</pre>
</blockquote>
In this example we can see how to join a room with a given nickname and password: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Create a MultiUserChat using a XMPPConnection for a room</font>
MultiUserChat muc2 = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
<font color="#3f7f5f">// User2 joins the new room using a password</font>
<font color="#3f7f5f">// The room service will decide the amount of history to send</font>
muc2.join(<font color="#0000FF">"testbot2"</font>, <font color="#0000FF">"password"</font>);
</pre>
</blockquote>
In this example we can see how to join a room with a given nickname specifying the amount of history
to receive: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Create a MultiUserChat using a XMPPConnection for a room</font>
MultiUserChat muc2 = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
<font color="#3f7f5f">// User2 joins the new room using a password and specifying</font>
<font color="#3f7f5f">// the amount of history to receive. In this example we are requesting the last 5 messages.</font>
DiscussionHistory history = new DiscussionHistory();
history.setMaxStanzas(5);
muc2.join(<font color="#0000FF">"testbot2"</font>, <font color="#0000FF">"password"</font>, history, SmackConfiguration.getPacketReplyTimeout());
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="invite">Manage room invitations</a></div><p>
<b>Description</b><p>
It can be useful to invite another user to a room in which one is an occupant. Depending on the
room's type the invitee could receive a password to use to join the room and/or be added to the
member list if the room is of type members-only. Smack allows to send room invitations and let
potential invitees to listening for room invitations and inviters to listen for invitees'
rejections.</p>
<b>Usage</b><p>
In order to invite another user to a room you must be already joined to the room. Once you are
joined just send <b>invite(String participant, String reason)</b> to the <i><b>MultiUserChat</b></i>
where participant is the user to invite to the room (e.g. hecate@shakespeare.lit) and reason is
the reason why the user is being invited.</p><p>
If potential invitees want to listen for room invitations then the invitee must add an <i><b>InvitationListener</b></i>
to the <i><b>MultiUserChat</b></i> class. Since the <i><b>InvitationListener</b></i> is an <i>interface</i>,
it is necessary to create a class that implements this <i>interface</i>. If an inviter wants to
listen for room invitation rejections, just add an <i><b>InvitationRejectionListener</b></i>
to the <i><b>MultiUserChat</b></i>. <i><b>InvitationRejectionListener</b></i> is also an
interface so you will need to create a class that implements this interface.</p>
<b>Examples</b><p>
In this example we can see how to invite another user to the room and lister for possible rejections: <br>
<blockquote>
<pre> <font color="#3f7f5f">// User2 joins the room</font>
MultiUserChat muc2 = new MultiUserChat(conn2, room);
muc2.join(<font color="#0000FF">"testbot2"</font>);
<font color="#3f7f5f">// User2 listens for invitation rejections</font>
muc2.addInvitationRejectionListener(new InvitationRejectionListener() {
public void invitationDeclined(String invitee, String reason) {
<font color="#3f7f5f">// Do whatever you need here...</font>
}
});
<font color="#3f7f5f">// User2 invites user3 to join to the room</font>
muc2.invite(<font color="#0000FF">"user3@host.org/Smack"</font>, <font color="#0000FF">"Meet me in this excellent room"</font>);
</pre>
</blockquote>
In this example we can see how to listen for room invitations and decline invitations: <br>
<blockquote>
<pre> <font color="#3f7f5f">// User3 listens for MUC invitations</font>
MultiUserChat.addInvitationListener(conn3, new InvitationListener() {
public void invitationReceived(XMPPConnection conn, String room, String inviter, String reason, String password) {
<font color="#3f7f5f">// Reject the invitation</font>
MultiUserChat.decline(conn, room, inviter, <font color="#0000FF">"I'm busy right now"</font>);
}
});
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="discomuc">Discover MUC support</a></div><p>
<b>Description</b><p>
A user may want to discover if one of the user's contacts supports the Multi-User Chat protocol.</p>
<b>Usage</b><p>
In order to discover if one of the user's contacts supports MUC just send
<b>isServiceEnabled(XMPPConnection connection, String user)</b> to the <i><b>MultiUserChat</b></i>
class where user is a fully qualified XMPP ID, e.g. jdoe@example.com. You will receive
a boolean indicating whether the user supports MUC or not.</p>
<b>Examples</b><p>
In this example we can see how to discover support of MUC: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Discover whether user3@host.org supports MUC or not</font>
boolean supports = MultiUserChat.isServiceEnabled(conn, <font color="#0000FF">"user3@host.org/Smack"</font>);
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="discojoin">Discover joined rooms</a></div><p>
<b>Description</b><p>
A user may also want to query a contact regarding which rooms the contact is in.</p>
<b>Usage</b><p>
In order to get the rooms where a user is in just send
<b>getJoinedRooms(XMPPConnection connection, String user)</b> to the <i><b>MultiUserChat</b></i>
class where user is a fully qualified XMPP ID, e.g. jdoe@example.com. You will get an Iterator
of Strings as an answer where each String represents a room name.</p>
<b>Examples</b><p>
In this example we can see how to get the rooms where a user is in: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Get the rooms where user3@host.org has joined</font>
Iterator joinedRooms = MultiUserChat.getJoinedRooms(conn, <font color="#0000FF">"user3@host.org/Smack"</font>);
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="discoroom">Discover room information</a></div><p>
<b>Description</b><p>
A user may need to discover information about a room without having to actually join the room. The server
will provide information only for public rooms.</p>
<b>Usage</b><p>
In order to discover information about a room just send <b>getRoomInfo(XMPPConnection connection, String room)</b>
to the <i><b>MultiUserChat</b></i> class where room is the XMPP ID of the room, e.g.
roomName@conference.myserver. You will get a RoomInfo object that contains the discovered room
information.</p>
<b>Examples</b><p>
In this example we can see how to discover information about a room: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Discover information about the room roomName@conference.myserver</font>
RoomInfo info = MultiUserChat.getRoomInfo(conn, <font color="#0000FF">"roomName@conference.myserver"</font>);
System.out.println("Number of occupants:" + info.getOccupantsCount());
System.out.println("Room Subject:" + info.getSubject());
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="privchat">Start a private chat</a></div><p>
<b>Description</b><p>
A room occupant may want to start a private chat with another room occupant even though they
don't know the fully qualified XMPP ID (e.g. jdoe@example.com) of each other.</p>
<b>Usage</b><p>
To create a private chat with another room occupant just send <b>createPrivateChat(String participant)</b>
to the <i><b>MultiUserChat</b></i> that you used to join the room. The parameter participant is the
occupant unique room JID (e.g. 'darkcave@macbeth.shakespeare.lit/Paul'). You will receive
a regular <i><b>Chat</b></i> object that you can use to chat with the other room occupant.</p>
<b>Examples</b><p>
In this example we can see how to start a private chat with another room occupant: <br>
<blockquote>
<pre> <font color="#3f7f5f">// Start a private chat with another participant</font>
Chat chat = muc2.createPrivateChat(<font color="#0000FF">"myroom@conference.jabber.org/johndoe"</font>);
chat.sendMessage(<font color="#0000FF">"Hello there"</font>);
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="subject">Manage changes on room subject</a></div><p>
<b>Description</b><p>
A common feature of multi-user chat rooms is the ability to change the subject within the room. As a
default, only users with a role of "moderator" are allowed to change the subject in a room. Although
some rooms may be configured to allow a mere participant or even a visitor to change the subject.</p><p>
Every time the room's subject is changed you may want to be notified of the modification. The new subject
could be used to display an in-room message.</p>
<b>Usage</b><p>
In order to modify the room's subject just send <b>changeSubject(String subject)</b> to the
<i><b>MultiUserChat</b></i> that you used to join the room where subject is the new room's subject. On
the other hand, if you want to be notified whenever the room's subject is modified you should add a
<i><b>SubjectUpdatedListener</b></i> to the <i><b>MultiUserChat</b></i> by sending
<b>addSubjectUpdatedListener(SubjectUpdatedListener listener)</b> to the <i><b>MultiUserChat</b></i>.
Since the <i><b>SubjectUpdatedListener</b></i> is an <i>interface</i>, it is necessary to create a class
that implements this <i>interface</i>.</p>
<b>Examples</b><p>
In this example we can see how to change the room's subject and react whenever the room's subject is
modified: <br>
<blockquote>
<pre> <font color="#3f7f5f">// An occupant wants to be notified every time the room's subject is changed</font>
muc3.addSubjectUpdatedListener(new SubjectUpdatedListener() {
public void subjectUpdated(String subject, String from) {
....
}
});
<font color="#3f7f5f">// A room's owner changes the room's subject</font>
muc2.changeSubject(<font color="#0000FF">"New Subject"</font>);
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="role">Manage role modifications</a></div><p>
<b>Description</b><p>
There are four defined roles that an occupant can have:</p>
<ol start="" type="">
<li>Moderator</li>
<li>Participant</li>
<li>Visitor</li>
<li>None (the absence of a role)</li>
</ol><p>
These roles are temporary in that they do not persist across a user's visits to the room
and can change during the course of an occupant's visit to the room.</p><p>
A moderator is the most powerful occupant within the context of the room, and can to some
extent manage other occupants' roles in the room. A participant has fewer privileges than a
moderator, although he or she always has the right to speak. A visitor is a more restricted
role within the context of a moderated room, since visitors are not allowed to send messages
to all occupants.</p><p>
Roles are granted, revoked, and maintained based on the occupant's room nickname or full
JID. Whenever an occupant's role is changed Smack will trigger specific events.</p>
<b>Usage</b><p>
In order to grant voice (i.e. make someone a <i>participant</i>) just send the message
<b>grantVoice(String nickname)</b> to <i><b>MultiUserChat</b></i>. Use <b>revokeVoice(String nickname)</b>
to revoke the occupant's voice (i.e. make the occupant a <i>visitor</i>).</p><p>
In order to grant moderator privileges to a participant or visitor just send the message
<b>grantModerator(String nickname)</b> to <i><b>MultiUserChat</b></i>. Use <b>revokeModerator(String nickname)</b>
to revoke the moderator privilege from the occupant thus making the occupant a participant.</p><p>
Smack allows you to listen for role modification events. If you are interested in listening role modification
events of any occupant then use the listener <b><i>ParticipantStatusListener</i></b>. But if you are interested
in listening for your own role modification events, use the listener <b><i>UserStatusListener</i></b>. Both listeners
should be added to the <i><b>MultiUserChat</b></i> by using
<b>addParticipantStatusListener(ParticipantStatusListener listener)</b> or
<b>addUserStatusListener(UserStatusListener listener)</b> respectively. These listeners include several notification
events but you may be interested in just a few of them. Smack provides default implementations for these listeners
avoiding you to implement all the interfaces' methods. The default implementations are <b><i>DefaultUserStatusListener</i></b>
and <b><i>DefaultParticipantStatusListener</i></b>. Below you will find the sent messages to the listeners whenever
an occupant's role has changed.</p><p>
These are the triggered events when the role has been upgraded:
</p>
<table border="1">
<tr><td><b>Old</b></td><td><b>New</b></td><td><b>Events</b></td></tr>
<tr><td>None</td><td>Visitor</td><td>--</td></tr>
<tr><td>Visitor</td><td>Participant</td><td>voiceGranted</td></tr>
<tr><td>Participant</td><td>Moderator</td><td>moderatorGranted</td></tr>
<tr><td>None</td><td>Participant</td><td>voiceGranted</td></tr>
<tr><td>None</td><td>Moderator</td><td>voiceGranted + moderatorGranted</td></tr>
<tr><td>Visitor</td><td>Moderator</td><td>voiceGranted + moderatorGranted</td></tr>
</table><p>
These are the triggered events when the role has been downgraded:
</p>
<table border="1">
<tr><td><b>Old</b></td><td><b>New</b></td><td><b>Events</b></td></tr>
<tr><td>Moderator</td><td>Participant</td><td>moderatorRevoked</td></tr>
<tr><td>Participant</td><td>Visitor</td><td>voiceRevoked</td></tr>
<tr><td>Visitor</td><td>None</td><td>kicked</td></tr>
<tr><td>Moderator</td><td>Visitor</td><td>voiceRevoked + moderatorRevoked</td></tr>
<tr><td>Moderator</td><td>None</td><td>kicked</td></tr>
<tr><td>Participant</td><td>None</td><td>kicked</td></tr>
</table></p>
<b>Examples</b><p>
In this example we can see how to grant voice to a visitor and listen for the notification events: <br>
<blockquote>
<pre> <font color="#3f7f5f">// User1 creates a room</font>
muc = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
muc.create(<font color="#0000FF">"testbot"</font>);
<font color="#3f7f5f">// User1 (which is the room owner) configures the room as a moderated room</font>
Form form = muc.getConfigurationForm();
Form answerForm = form.createAnswerForm();
answerForm.setAnswer(<font color="#0000FF">"muc#roomconfig_moderatedroom"</font>, <font color="#0000FF">"1"</font>);
muc.sendConfigurationForm(answerForm);
<font color="#3f7f5f">// User2 joins the new room (as a visitor)</font>
MultiUserChat muc2 = new MultiUserChat(conn2, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
muc2.join(<font color="#0000FF">"testbot2"</font>);
<font color="#3f7f5f">// User2 will listen for his own "voice" notification events</font>
muc2.addUserStatusListener(new DefaultUserStatusListener() {
public void voiceGranted() {
super.voiceGranted();
...
}
public void voiceRevoked() {
super.voiceRevoked();
...
}
});
<font color="#3f7f5f">// User3 joins the new room (as a visitor)</font>
MultiUserChat muc3 = new MultiUserChat(conn3, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
muc3.join(<font color="#0000FF">"testbot3"</font>);
<font color="#3f7f5f">// User3 will lister for other occupants "voice" notification events</font>
muc3.addParticipantStatusListener(new DefaultParticipantStatusListener() {
public void voiceGranted(String participant) {
super.voiceGranted(participant);
...
}
public void voiceRevoked(String participant) {
super.voiceRevoked(participant);
...
}
});
<font color="#3f7f5f">// The room's owner grants voice to user2</font>
muc.grantVoice(<font color="#0000FF">"testbot2"</font>);
</pre>
</blockquote>
<hr>
<div class="subheader"><a name="afiliation">Manage affiliation modifications</a></div><p>
<b>Description</b><p>
There are five defined affiliations that a user can have in relation to a room:</p>
<ol start="" type="">
<li>Owner</li>
<li>Admin</li>
<li>Member</li>
<li>Outcast</li>
<li>None (the absence of an affiliation)</li>
</ol><p>
These affiliations are semi-permanent in that they persist across a user's visits to the room and
are not affected by happenings in the room. Affiliations are granted, revoked, and maintained
based on the user's bare JID.</p><p>
If a user without a defined affiliation enters a room, the user's affiliation is defined as &quot;none&quot;;
however, this affiliation does not persist across visits.</p><p>
Owners and admins are by definition immune from certain actions. Specifically, an owner or admin cannot
be kicked from a room and cannot be banned from a room. An admin must first lose his or her affiliation
(i.e., have an affiliation of &quot;none&quot; or &quot;member&quot;) before such actions could be performed
on them.</p><p>
The member affiliation provides a way for a room owner or admin to specify a &quot;whitelist&quot; of users
who are allowed to enter a members-only room. When a member enters a members-only room, his or her affiliation
does not change, no matter what his or her role is. The member affiliation also provides a way for users to
effectively register with an open room and thus be permanently associated with that room in some way (one
result may be that the user's nickname is reserved in the room).</p><p>
An outcast is a user who has been banned from a room and who is not allowed to enter the room. Whenever a
user's affiliation is changed Smack will trigger specific events.</p>
<b>Usage</b><p>
In order to grant membership to a room, administrator privileges or owner priveliges just send
<b>grantMembership(String jid)</b>, <b>grantAdmin(String jid)</b> or <b>grantOwnership(String jid)</b>
to <i><b>MultiUserChat</b></i> respectively. Use <b>revokeMembership(String jid)</b>, <b>revokeAdmin(String jid)</b>
or <b>revokeOwnership(String jid)</b> to revoke the membership to a room, administrator privileges or
owner priveliges respectively.</p><p>
In order to ban a user from the room just send the message <b>banUser(String jid, String reason)</b> to
<i><b>MultiUserChat</b></i>.</p><p>
Smack allows you to listen for affiliation modification events. If you are interested in listening affiliation modification
events of any user then use the listener <b><i>ParticipantStatusListener</i></b>. But if you are interested
in listening for your own affiliation modification events, use the listener <b><i>UserStatusListener</i></b>. Both listeners
should be added to the <i><b>MultiUserChat</b></i> by using
<b>addParticipantStatusListener(ParticipantStatusListener listener)</b> or
<b>addUserStatusListener(UserStatusListener listener)</b> respectively. These listeners include several notification
events but you may be interested in just a few of them. Smack provides default implementations for these listeners
avoiding you to implement all the interfaces' methods. The default implementations are <b><i>DefaultUserStatusListener</i></b>
and <b><i>DefaultParticipantStatusListener</i></b>. Below you will find the sent messages to the listeners whenever
a user's affiliation has changed.</p><p>
These are the triggered events when the affiliation has been upgraded:
</p>
<table border="1">
<tr><td><b>Old</b></td><td><b>New</b></td><td><b>Events</b></td></tr>
<tr><td>None</td><td>Member</td><td>membershipGranted</td></tr>
<tr><td>Member</td><td>Admin</td><td>membershipRevoked + adminGranted</td></tr>
<tr><td>Admin</td><td>Owner</td><td>adminRevoked + ownershipGranted</td></tr>
<tr><td>None</td><td>Admin</td><td>adminGranted</td></tr>
<tr><td>None</td><td>Owner</td><td>ownershipGranted</td></tr>
<tr><td>Member</td><td>Owner</td><td>membershipRevoked + ownershipGranted</td></tr>
</table><p>
These are the triggered events when the affiliation has been downgraded:
</p>
<table border="1">
<tr><td><b>Old</b></td><td><b>New</b></td><td><b>Events</b></td></tr>
<tr><td>Owner</td><td>Admin</td><td>ownershipRevoked + adminGranted</td></tr>
<tr><td>Admin</td><td>Member</td><td>adminRevoked + membershipGranted</td></tr>
<tr><td>Member</td><td>None</td><td>membershipRevoked</td></tr>
<tr><td>Owner</td><td>Member</td><td>ownershipRevoked + membershipGranted</td></tr>
<tr><td>Owner</td><td>None</td><td>ownershipRevoked</td></tr>
<tr><td>Admin</td><td>None</td><td>adminRevoked</td></tr>
<tr><td><i>Anyone</i></td><td>Outcast</td><td>banned</td></tr>
</table></p>
<b>Examples</b><p>
In this example we can see how to grant admin privileges to a user and listen for the notification events: <br>
<blockquote>
<pre> <font color="#3f7f5f">// User1 creates a room</font>
muc = new MultiUserChat(conn1, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
muc.create(<font color="#0000FF">"testbot"</font>);
<font color="#3f7f5f">// User1 (which is the room owner) configures the room as a moderated room</font>
Form form = muc.getConfigurationForm();
Form answerForm = form.createAnswerForm();
answerForm.setAnswer(<font color="#0000FF">"muc#roomconfig_moderatedroom"</font>, <font color="#0000FF">"1"</font>);
muc.sendConfigurationForm(answerForm);
<font color="#3f7f5f">// User2 joins the new room (as a visitor)</font>
MultiUserChat muc2 = new MultiUserChat(conn2, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
muc2.join(<font color="#0000FF">"testbot2"</font>);
<font color="#3f7f5f">// User2 will listen for his own admin privileges</font>
muc2.addUserStatusListener(new DefaultUserStatusListener() {
public void membershipRevoked() {
super.membershipRevoked();
...
}
public void adminGranted() {
super.adminGranted();
...
}
});
<font color="#3f7f5f">// User3 joins the new room (as a visitor)</font>
MultiUserChat muc3 = new MultiUserChat(conn3, <font color="#0000FF">"myroom@conference.jabber.org"</font>);
muc3.join(<font color="#0000FF">"testbot3"</font>);
<font color="#3f7f5f">// User3 will lister for other users admin privileges</font>
muc3.addParticipantStatusListener(new DefaultParticipantStatusListener() {
public void membershipRevoked(String participant) {
super.membershipRevoked(participant);
...
}
public void adminGranted(String participant) {
super.adminGranted(participant);
...
}
});
<font color="#3f7f5f">// The room's owner grants admin privileges to user2</font>
muc.grantAdmin(<font color="#0000FF">"user2@jabber.org"</font>);
</pre>
</blockquote>
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