/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2007 Jive Software.
*
* 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.
*/
package org.jivesoftware.smackx.packet;
import org.jivesoftware.smack.Roster;
import org.jivesoftware.smack.RosterEntry;
import org.jivesoftware.smack.RosterGroup;
import org.jivesoftware.smack.packet.PacketExtension;
import org.jivesoftware.smackx.RemoteRosterEntry;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
/**
* Represents XMPP Roster Item Exchange packets.<p>
*
* The 'jabber:x:roster' namespace (which is not to be confused with the 'jabber:iq:roster'
* namespace) is used to send roster items from one client to another. A roster item is sent by
* adding to the <message/> element an <x/> child scoped by the 'jabber:x:roster' namespace. This
* <x/> element may contain one or more <item/> children (one for each roster item to be sent).<p>
*
* Each <item/> element may possess the following attributes:<p>
*
* <jid/> -- The id of the contact being sent. This attribute is required.<br>
* <name/> -- A natural-language nickname for the contact. This attribute is optional.<p>
*
* Each <item/> element may also contain one or more <group/> children specifying the
* natural-language name of a user-specified group, for the purpose of categorizing this contact
* into one or more roster groups.
*
* @author Gaston Dombiak
*/
public class RosterExchange implements PacketExtension {
private List<RemoteRosterEntry> remoteRosterEntries = new ArrayList<RemoteRosterEntry>();
/**
* Creates a new empty roster exchange package.
*
*/
public RosterExchange() {
super();
}
/**
* Creates a new roster exchange package with the entries specified in roster.
*
* @param roster the roster to send to other XMPP entity.
*/
public RosterExchange(Roster roster) {
// Add all the roster entries to the new RosterExchange
for (RosterEntry rosterEntry : roster.getEntries()) {
this.addRosterEntry(rosterEntry);
}
}
/**
* Adds a roster entry to the packet.
*
* @param rosterEntry a roster entry to add.
*/
public void addRosterEntry(RosterEntry rosterEntry) {
// Obtain a String[] from the roster entry groups name
List<String> groupNamesList = new ArrayList<String>();
String[] groupNames;
for (RosterGroup group : rosterEntry.getGroups()) {
groupNamesList.add(group.getName());
}
groupNames = groupNamesList.toArray(new String[groupNamesList.size()]);
// Create a new Entry based on the rosterEntry and add it to the packet
RemoteRosterEntry remoteRosterEntry = new RemoteRosterEntry(rosterEntry.getUser(),
rosterEntry.getName(), groupNames);
addRosterEntry(remoteRosterEntry);
}
/**
* Adds a remote roster entry to the packet.
*
* @param remoteRosterEntry a remote roster entry to add.
*/
public void addRosterEntry(RemoteRosterEntry remoteRosterEntry) {
synchronized (remoteRosterEntries) {
remoteRosterEntries.add(remoteRosterEntry);
}
}
/**
* Returns the XML element name of the extension sub-packet root element.
* Always returns "x"
*
* @return the XML element name of the packet extension.
*/
public String getElementName() {
return "x";
}
/**
* Returns the XML namespace of the extension sub-packet root element.
* According the specification the namespace is always "jabber:x:roster"
* (which is not to be confused with the 'jabber:iq:roster' namespace
*
* @return the XML namespace of the packet extension.
*/
public String getNamespace() {
return "jabber:x:roster";
}
/**
* Returns an Iterator for the roster entries in the packet.
*
* @return an Iterator for the roster entries in the packet.
*/
public Iterator<RemoteRosterEntry> getRosterEntries() {
synchronized (remoteRosterEntries) {
List<RemoteRosterEntry> entries = Collections.unmodifiableList(new ArrayList<RemoteRosterEntry>(remoteRosterEntries));
return entries.iterator();
}
}
/**
* Returns a count of the entries in the roster exchange.
*
* @return the number of entries in the roster exchange.
*/
public int getEntryCount() {
return remoteRosterEntries.size();
}
/**
* Returns the XML representation of a Roster Item Exchange according the specification.
*
* Usually the XML representation will be inside of a Message XML representation like
* in the following example:
* <pre>
* <message id="MlIpV-4" to="gato1@gato.home" from="gato3@gato.home/Smack">
* <subject>Any subject you want</subject>
* <body>This message contains roster items.</body>
* <x xmlns="jabber:x:roster">
* <item jid="gato1@gato.home"/>
* <item jid="gato2@gato.home"/>
* </x>
* </message>
* </pre>
*
*/
public String toXML() {
StringBuilder buf = new StringBuilder();
buf.append("<").append(getElementName()).append(" xmlns=\"").append(getNamespace()).append(
"\">");
// Loop through all roster entries and append them to the string buffer
for (Iterator<RemoteRosterEntry> i = getRosterEntries(); i.hasNext();) {
RemoteRosterEntry remoteRosterEntry = i.next();
buf.append(remoteRosterEntry.toXML());
}
buf.append("</").append(getElementName()).append(">");
return buf.toString();
}
}