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162 lines
5.2 KiB
Markdown
162 lines
5.2 KiB
Markdown
Roster Item Exchange
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====================
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[Back](index.md)
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This extension is used to send rosters, roster groups and roster entries from
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one XMPP Entity to another. It also provides an easy way to hook up custom
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logic when entries are received from other XMPP clients.
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Follow these links to learn how to send and receive roster items:
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* Send a complete roster
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* Send a roster's group
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* Send a roster's entry
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* Receive roster entries
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**XEP related:** [XEP-93](http://www.xmpp.org/extensions/xep-0093.html)
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Send a entire roster
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-------------------
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**Description**
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Sometimes it is useful to send a whole roster to another user. Smack provides
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a very easy way to send a complete roster to another XMPP client.
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**Usage**
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Create an instance of _**RosterExchangeManager**_ and use the **#send(Roster,
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String)** message to send a roster to a given user. The first parameter is the
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roster to send and the second parameter is the id of the user that will
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receive the roster entries.
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**Example**
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In this example we can see how user1 sends his roster to user2.
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```
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XMPPConnection conn1 = …
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// Create a new roster exchange manager on conn1
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RosterExchangeManager rosterExchangeManager = new RosterExchangeManager(conn1);
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// Send user1's roster to user2
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rosterExchangeManager.send(Roster.getInstanceFor(conn1), user2);
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```
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Send a roster group
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-------------------
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**Description**
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It is also possible to send a roster group to another XMPP client. A roster
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group groups a set of roster entries under a name.
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**Usage**
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Create an instance of _**RosterExchangeManager**_ and use the
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**#send(RosterGroup, String)** message to send a roster group to a given user.
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The first parameter is the roster group to send and the second parameter is
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the id of the user that will receive the roster entries.
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**Example**
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In this example we can see how user1 sends his roster groups to user2.
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```
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XMPPConnection conn1 = …
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// Create a new roster exchange manager on conn1
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RosterExchangeManager rosterExchangeManager = new RosterExchangeManager(conn1);
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// Send user1's RosterGroups to user2
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for (Iterator it = Roster.getInstanceFor(conn1).getGroups(); it.hasNext(); )
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rosterExchangeManager.send((RosterGroup)it.next(), user2);
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```
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Send a roster entry
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-------------------
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**Description**
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Sometimes you may need to send a single roster entry to another XMPP client.
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Smack also lets you send items at this granularity level.
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**Usage**
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Create an instance of _**RosterExchangeManager**_ and use the
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**#send(RosterEntry, String)** message to send a roster entry to a given user.
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The first parameter is the roster entry to send and the second parameter is
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the id of the user that will receive the roster entries.
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**Example**
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In this example we can see how user1 sends a roster entry to user2.
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```
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XMPPConnection conn1 = …
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// Create a new roster exchange manager on conn1
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RosterExchangeManager rosterExchangeManager = new RosterExchangeManager(conn1);
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// Send a roster entry (any) to user2
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rosterExchangeManager1.send((RosterEntry)Roster.getInstanceFor(conn1).getEntries().next(), user2);
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```
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Receive roster entries
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----------------------
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**Description**
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Since roster items are sent between XMPP clients, it is necessary to listen to
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possible roster entries receptions. Smack provides a mechanism that you can
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use to execute custom logic when roster entries are received.
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**Usage**
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1. Create a class that implements the _**RosterExchangeListener**_ interface.
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2. Implement the method **entriesReceived(String, Iterator)** that will be called when new entries are received with custom logic.
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3. Add the listener to the _RosterExchangeManager_ that works on the desired _XMPPConnection_.
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**Example**
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In this example we can see how user1 sends a roster entry to user2 and user2
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adds the received entries to his roster.
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```
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// Connect to the server and log in the users
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XMPPConnection conn1 = …
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XMPPConnection conn2 = …
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final Roster user2_roster = Roster.getInstanceFor(conn2);
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// Create a RosterExchangeManager that will help user2 to listen and accept
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the entries received
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RosterExchangeManager rosterExchangeManager2 = new RosterExchangeManager(conn2);
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// Create a RosterExchangeListener that will iterate over the received roster entries
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RosterExchangeListener rosterExchangeListener = new RosterExchangeListener() {
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public void entriesReceived(String from, Iterator remoteRosterEntries) {
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while (remoteRosterEntries.hasNext()) {
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try {
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// Get the received entry
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RemoteRosterEntry remoteRosterEntry = (RemoteRosterEntry) remoteRosterEntries.next();
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// Display the remote entry on the console
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System.out.println(remoteRosterEntry);
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// Add the entry to the user2's roster
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user2_roster.createEntry(
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remoteRosterEntry.getUser(),
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remoteRosterEntry.getName(),
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remoteRosterEntry.getGroupArrayNames());
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}
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catch (XMPPException e) {
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e.printStackTrace();
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}
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}
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}
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};
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// Add the RosterExchangeListener to the RosterExchangeManager that user2 is using
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rosterExchangeManager2.addRosterListener(rosterExchangeListener);
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// Create a RosterExchangeManager that will help user1 to send his roster
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RosterExchangeManager rosterExchangeManager1 = new RosterExchangeManager(conn1);
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// Send user1's roster to user2
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rosterExchangeManager1.send(Roster.getInstanceFor(conn1), user2);
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```
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