/**
* $Revision$
* $Date$
*
* 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.workgroup.agent;
import org.jivesoftware.smackx.workgroup.packet.AgentStatus;
import org.jivesoftware.smackx.workgroup.packet.AgentStatusRequest;
import org.jivesoftware.smack.PacketListener;
import org.jivesoftware.smack.Connection;
import org.jivesoftware.smack.filter.PacketFilter;
import org.jivesoftware.smack.filter.PacketTypeFilter;
import org.jivesoftware.smack.packet.Packet;
import org.jivesoftware.smack.packet.Presence;
import org.jivesoftware.smack.util.StringUtils;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Manges information about the agents in a workgroup and their presence.
*
* @author Matt Tucker
* @see AgentSession#getAgentRoster()
*/
public class AgentRoster {
private static final int EVENT_AGENT_ADDED = 0;
private static final int EVENT_AGENT_REMOVED = 1;
private static final int EVENT_PRESENCE_CHANGED = 2;
private Connection connection;
private String workgroupJID;
private List<String> entries;
private List<AgentRosterListener> listeners;
private Map<String, Map<String, Presence>> presenceMap;
// The roster is marked as initialized when at least a single roster packet
// has been recieved and processed.
boolean rosterInitialized = false;
/**
* Constructs a new AgentRoster.
*
* @param connection an XMPP connection.
*/
AgentRoster(Connection connection, String workgroupJID) {
this.connection = connection;
this.workgroupJID = workgroupJID;
entries = new ArrayList<String>();
listeners = new ArrayList<AgentRosterListener>();
presenceMap = new HashMap<String, Map<String, Presence>>();
// Listen for any roster packets.
PacketFilter rosterFilter = new PacketTypeFilter(AgentStatusRequest.class);
connection.addPacketListener(new AgentStatusListener(), rosterFilter);
// Listen for any presence packets.
connection.addPacketListener(new PresencePacketListener(),
new PacketTypeFilter(Presence.class));
// Send request for roster.
AgentStatusRequest request = new AgentStatusRequest();
request.setTo(workgroupJID);
connection.sendPacket(request);
}
/**
* Reloads the entire roster from the server. This is an asynchronous operation,
* which means the method will return immediately, and the roster will be
* reloaded at a later point when the server responds to the reload request.
*/
public void reload() {
AgentStatusRequest request = new AgentStatusRequest();
request.setTo(workgroupJID);
connection.sendPacket(request);
}
/**
* Adds a listener to this roster. The listener will be fired anytime one or more
* changes to the roster are pushed from the server.
*
* @param listener an agent roster listener.
*/
public void addListener(AgentRosterListener listener) {
synchronized (listeners) {
if (!listeners.contains(listener)) {
listeners.add(listener);
// Fire events for the existing entries and presences in the roster
for (Iterator<String> it = getAgents().iterator(); it.hasNext();) {
String jid = it.next();
// Check again in case the agent is no longer in the roster (highly unlikely
// but possible)
if (entries.contains(jid)) {
// Fire the agent added event
listener.agentAdded(jid);
Map<String,Presence> userPresences = presenceMap.get(jid);
if (userPresences != null) {
Iterator<Presence> presences = userPresences.values().iterator();
while (presences.hasNext()) {
// Fire the presence changed event
listener.presenceChanged(presences.next());
}
}
}
}
}
}
}
/**
* Removes a listener from this roster. The listener will be fired anytime one or more
* changes to the roster are pushed from the server.
*
* @param listener a roster listener.
*/
public void removeListener(AgentRosterListener listener) {
synchronized (listeners) {
listeners.remove(listener);
}
}
/**
* Returns a count of all agents in the workgroup.
*
* @return the number of agents in the workgroup.
*/
public int getAgentCount() {
return entries.size();
}
/**
* Returns all agents (String JID values) in the workgroup.
*
* @return all entries in the roster.
*/
public Set<String> getAgents() {
Set<String> agents = new HashSet<String>();
synchronized (entries) {
for (Iterator<String> i = entries.iterator(); i.hasNext();) {
agents.add(i.next());
}
}
return Collections.unmodifiableSet(agents);
}
/**
* Returns true if the specified XMPP address is an agent in the workgroup.
*
* @param jid the XMPP address of the agent (eg "jsmith@example.com"). The
* address can be in any valid format (e.g. "domain/resource", "user@domain"
* or "user@domain/resource").
* @return true if the XMPP address is an agent in the workgroup.
*/
public boolean contains(String jid) {
if (jid == null) {
return false;
}
synchronized (entries) {
for (Iterator<String> i = entries.iterator(); i.hasNext();) {
String entry = i.next();
if (entry.toLowerCase().equals(jid.toLowerCase())) {
return true;
}
}
}
return false;
}
/**
* Returns the presence info for a particular agent, or <tt>null</tt> if the agent
* is unavailable (offline) or if no presence information is available.<p>
*
* @param user a fully qualified xmpp JID. The address could be in any valid format (e.g.
* "domain/resource", "user@domain" or "user@domain/resource").
* @return the agent's current presence, or <tt>null</tt> if the agent is unavailable
* or if no presence information is available..
*/
public Presence getPresence(String user) {
String key = getPresenceMapKey(user);
Map<String, Presence> userPresences = presenceMap.get(key);
if (userPresences == null) {
Presence presence = new Presence(Presence.Type.unavailable);
presence.setFrom(user);
return presence;
}
else {
// Find the resource with the highest priority
// Might be changed to use the resource with the highest availability instead.
Iterator<String> it = userPresences.keySet().iterator();
Presence p;
Presence presence = null;
while (it.hasNext()) {
p = (Presence)userPresences.get(it.next());
if (presence == null){
presence = p;
}
else {
if (p.getPriority() > presence.getPriority()) {
presence = p;
}
}
}
if (presence == null) {
presence = new Presence(Presence.Type.unavailable);
presence.setFrom(user);
return presence;
}
else {
return presence;
}
}
}
/**
* Returns the key to use in the presenceMap for a fully qualified xmpp ID. The roster
* can contain any valid address format such us "domain/resource", "user@domain" or
* "user@domain/resource". If the roster contains an entry associated with the fully qualified
* xmpp ID then use the fully qualified xmpp ID as the key in presenceMap, otherwise use the
* bare address. Note: When the key in presenceMap is a fully qualified xmpp ID, the
* userPresences is useless since it will always contain one entry for the user.
*
* @param user the fully qualified xmpp ID, e.g. jdoe@example.com/Work.
* @return the key to use in the presenceMap for the fully qualified xmpp ID.
*/
private String getPresenceMapKey(String user) {
String key = user;
if (!contains(user)) {
key = StringUtils.parseBareAddress(user).toLowerCase();
}
return key;
}
/**
* Fires event to listeners.
*/
private void fireEvent(int eventType, Object eventObject) {
AgentRosterListener[] listeners = null;
synchronized (this.listeners) {
listeners = new AgentRosterListener[this.listeners.size()];
this.listeners.toArray(listeners);
}
for (int i = 0; i < listeners.length; i++) {
switch (eventType) {
case EVENT_AGENT_ADDED:
listeners[i].agentAdded((String)eventObject);
break;
case EVENT_AGENT_REMOVED:
listeners[i].agentRemoved((String)eventObject);
break;
case EVENT_PRESENCE_CHANGED:
listeners[i].presenceChanged((Presence)eventObject);
break;
}
}
}
/**
* Listens for all presence packets and processes them.
*/
private class PresencePacketListener implements PacketListener {
public void processPacket(Packet packet) {
Presence presence = (Presence)packet;
String from = presence.getFrom();
if (from == null) {
// TODO Check if we need to ignore these presences or this is a server bug?
System.out.println("Presence with no FROM: " + presence.toXML());
return;
}
String key = getPresenceMapKey(from);
// If an "available" packet, add it to the presence map. Each presence map will hold
// for a particular user a map with the presence packets saved for each resource.
if (presence.getType() == Presence.Type.available) {
// Ignore the presence packet unless it has an agent status extension.
AgentStatus agentStatus = (AgentStatus)presence.getExtension(
AgentStatus.ELEMENT_NAME, AgentStatus.NAMESPACE);
if (agentStatus == null) {
return;
}
// Ensure that this presence is coming from an Agent of the same workgroup
// of this Agent
else if (!workgroupJID.equals(agentStatus.getWorkgroupJID())) {
return;
}
Map<String, Presence> userPresences;
// Get the user presence map
if (presenceMap.get(key) == null) {
userPresences = new HashMap<String, Presence>();
presenceMap.put(key, userPresences);
}
else {
userPresences = presenceMap.get(key);
}
// Add the new presence, using the resources as a key.
synchronized (userPresences) {
userPresences.put(StringUtils.parseResource(from), presence);
}
// Fire an event.
synchronized (entries) {
for (Iterator<String> i = entries.iterator(); i.hasNext();) {
String entry = i.next();
if (entry.toLowerCase().equals(StringUtils.parseBareAddress(key).toLowerCase())) {
fireEvent(EVENT_PRESENCE_CHANGED, packet);
}
}
}
}
// If an "unavailable" packet, remove any entries in the presence map.
else if (presence.getType() == Presence.Type.unavailable) {
if (presenceMap.get(key) != null) {
Map<String,Presence> userPresences = presenceMap.get(key);
synchronized (userPresences) {
userPresences.remove(StringUtils.parseResource(from));
}
if (userPresences.isEmpty()) {
presenceMap.remove(key);
}
}
// Fire an event.
synchronized (entries) {
for (Iterator<String> i = entries.iterator(); i.hasNext();) {
String entry = (String)i.next();
if (entry.toLowerCase().equals(StringUtils.parseBareAddress(key).toLowerCase())) {
fireEvent(EVENT_PRESENCE_CHANGED, packet);
}
}
}
}
}
}
/**
* Listens for all roster packets and processes them.
*/
private class AgentStatusListener implements PacketListener {
public void processPacket(Packet packet) {
if (packet instanceof AgentStatusRequest) {
AgentStatusRequest statusRequest = (AgentStatusRequest)packet;
for (Iterator<AgentStatusRequest.Item> i = statusRequest.getAgents().iterator(); i.hasNext();) {
AgentStatusRequest.Item item = i.next();
String agentJID = item.getJID();
if ("remove".equals(item.getType())) {
// Removing the user from the roster, so remove any presence information
// about them.
String key = StringUtils.parseName(StringUtils.parseName(agentJID) + "@" +
StringUtils.parseServer(agentJID));
presenceMap.remove(key);
// Fire event for roster listeners.
fireEvent(EVENT_AGENT_REMOVED, agentJID);
}
else {
entries.add(agentJID);
// Fire event for roster listeners.
fireEvent(EVENT_AGENT_ADDED, agentJID);
}
}
// Mark the roster as initialized.
rosterInitialized = true;
}
}
}
}