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Smack/source/org/jivesoftware/smack/Roster.java

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/**
* $RCSfile$
* $Revision$
* $Date$
*
* Copyright 2003-2004 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.smack;
import org.jivesoftware.smack.packet.*;
import org.jivesoftware.smack.filter.*;
import org.jivesoftware.smack.util.StringUtils;
import java.util.*;
/**
* Represents a user's roster, which is the collection of users a person receives
* presence updates for. Roster items are categorized into groups for easier management.<p>
*
* Others users may attempt to subscribe to this user using a subscription request. Three
* modes are supported for handling these requests: <ul>
* <li> SUBSCRIPTION_ACCEPT_ALL -- accept all subscription requests.
* <li> SUBSCRIPTION_REJECT_ALL -- reject all subscription requests.
* <li> SUBSCRIPTION_MANUAL -- manually process all subscription requests. </ul>
*
* @see XMPPConnection#getRoster()
* @author Matt Tucker
*/
public class Roster {
/**
* Automatically accept all subscription requests. This is the default mode
* and is suitable for simple client. More complex client will likely wish to
* handle subscription requests manually.
*/
public static final int SUBSCRIPTION_ACCEPT_ALL = 0;
/**
* Automatically reject all subscription requests.
*/
public static final int SUBSCRIPTION_REJECT_ALL = 1;
/**
* Subscription requests are ignored, which means they must be manually
* processed by registering a listener for presence packets and then looking
* for any presence requests that have the type Presence.Type.SUBSCRIBE.
*/
public static final int SUBSCRIPTION_MANUAL = 2;
/**
* The default subscription processing mode to use when a Roster is created. By default
* all subscription requests are automatically accepted.
*/
private static int defaultSubscriptionMode = SUBSCRIPTION_ACCEPT_ALL;
private XMPPConnection connection;
private Map groups;
private List entries;
private List unfiledEntries;
private List rosterListeners;
private Map presenceMap;
// The roster is marked as initialized when at least a single roster packet
// has been recieved and processed.
boolean rosterInitialized = false;
private int subscriptionMode = getDefaultSubscriptionMode();
/**
* Returns the default subscription processing mode to use when a new Roster is created. The
* subscription processing mode dictates what action Smack will take when subscription
* requests from other users are made. The default subscription mode
* is {@link #SUBSCRIPTION_ACCEPT_ALL}.
*
* @return the default subscription mode to use for new Rosters
*/
public static int getDefaultSubscriptionMode() {
return defaultSubscriptionMode;
}
/**
* Sets the default subscription processing mode to use when a new Roster is created. The
* subscription processing mode dictates what action Smack will take when subscription
* requests from other users are made. The default subscription mode
* is {@link #SUBSCRIPTION_ACCEPT_ALL}.
*
* @param subscriptionMode the default subscription mode to use for new Rosters.
*/
public static void setDefaultSubscriptionMode(int subscriptionMode) {
defaultSubscriptionMode = subscriptionMode;
}
/**
* Creates a new roster.
*
* @param connection an XMPP connection.
*/
Roster(final XMPPConnection connection) {
this.connection = connection;
groups = new Hashtable();
unfiledEntries = new ArrayList();
entries = new ArrayList();
rosterListeners = new ArrayList();
presenceMap = new HashMap();
// Listen for any roster packets.
PacketFilter rosterFilter = new PacketTypeFilter(RosterPacket.class);
connection.addPacketListener(new RosterPacketListener(), rosterFilter);
// Listen for any presence packets.
PacketFilter presenceFilter = new PacketTypeFilter(Presence.class);
connection.addPacketListener(new PresencePacketListener(), presenceFilter);
}
/**
* Returns the subscription processing mode, which dictates what action
* Smack will take when subscription requests from other users are made.
* The default subscription mode is {@link #SUBSCRIPTION_ACCEPT_ALL}.<p>
*
* If using the manual mode, a PacketListener should be registered that
* listens for Presence packets that have a type of
* {@link org.jivesoftware.smack.packet.Presence.Type#SUBSCRIBE}.
*
* @return the subscription mode.
*/
public int getSubscriptionMode() {
return subscriptionMode;
}
/**
* Sets the subscription processing mode, which dictates what action
* Smack will take when subscription requests from other users are made.
* The default subscription mode is {@link #SUBSCRIPTION_ACCEPT_ALL}.<p>
*
* If using the manual mode, a PacketListener should be registered that
* listens for Presence packets that have a type of
* {@link org.jivesoftware.smack.packet.Presence.Type#SUBSCRIBE}.
*
* @param subscriptionMode the subscription mode.
*/
public void setSubscriptionMode(int subscriptionMode) {
if (subscriptionMode != SUBSCRIPTION_ACCEPT_ALL &&
subscriptionMode != SUBSCRIPTION_REJECT_ALL &&
subscriptionMode != SUBSCRIPTION_MANUAL)
{
throw new IllegalArgumentException("Invalid mode.");
}
this.subscriptionMode = subscriptionMode;
}
/**
* 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() {
connection.sendPacket(new RosterPacket());
}
/**
* 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 rosterListener a roster listener.
*/
public void addRosterListener(RosterListener rosterListener) {
synchronized (rosterListeners) {
if (!rosterListeners.contains(rosterListener)) {
rosterListeners.add(rosterListener);
}
}
}
/**
* 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 rosterListener a roster listener.
*/
public void removeRosterListener(RosterListener rosterListener) {
synchronized (rosterListeners) {
rosterListeners.remove(rosterListener);
}
}
/**
* Creates a new group.<p>
*
* Note: you must add at least one entry to the group for the group to be kept
* after a logout/login. This is due to the way that XMPP stores group information.
*
* @param name the name of the group.
* @return a new group.
*/
public RosterGroup createGroup(String name) {
synchronized (groups) {
if (groups.containsKey(name)) {
throw new IllegalArgumentException("Group with name " + name + " alread exists.");
}
RosterGroup group = new RosterGroup(name, connection);
groups.put(name, group);
return group;
}
}
/**
* Creates a new roster entry and presence subscription. The server will asynchronously
* update the roster with the subscription status.
*
* @param user the user. (e.g. johndoe@jabber.org)
* @param name the nickname of the user.
* @param groups the list of group names the entry will belong to, or <tt>null</tt> if the
* the roster entry won't belong to a group.
*/
public void createEntry(String user, String name, String [] groups) throws XMPPException {
// Create and send roster entry creation packet.
RosterPacket rosterPacket = new RosterPacket();
rosterPacket.setType(IQ.Type.SET);
RosterPacket.Item item = new RosterPacket.Item(user, name);
if (groups != null) {
for (int i=0; i<groups.length; i++) {
if (groups[i] != null) {
item.addGroupName(groups[i]);
}
}
}
rosterPacket.addRosterItem(item);
// Wait up to a certain number of seconds for a reply from the server.
PacketCollector collector = connection.createPacketCollector(
new PacketIDFilter(rosterPacket.getPacketID()));
connection.sendPacket(rosterPacket);
IQ response = (IQ)collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
collector.cancel();
if (response == null) {
throw new XMPPException("No response from the server.");
}
// If the server replied with an error, throw an exception.
else if (response.getType() == IQ.Type.ERROR) {
throw new XMPPException(response.getError());
}
// Create a presence subscription packet and send.
Presence presencePacket = new Presence(Presence.Type.SUBSCRIBE);
presencePacket.setTo(user);
connection.sendPacket(presencePacket);
}
/**
* Removes a roster entry from the roster. The roster entry will also be removed from the
* unfiled entries or from any roster group where it could belong and will no longer be part
* of the roster. Note that this is an asynchronous call -- Smack must wait for the server
* to send an updated subscription status.
*
* @param entry a roster entry.
*/
public void removeEntry(RosterEntry entry) throws XMPPException {
// Only remove the entry if it's in the entry list.
// The actual removal logic takes place in RosterPacketListenerprocess>>Packet(Packet)
synchronized (entries) {
if (!entries.contains(entry)) {
return;
}
}
RosterPacket packet = new RosterPacket();
packet.setType(IQ.Type.SET);
RosterPacket.Item item = RosterEntry.toRosterItem(entry);
// Set the item type as REMOVE so that the server will delete the entry
item.setItemType(RosterPacket.ItemType.REMOVE);
packet.addRosterItem(item);
PacketCollector collector = connection.createPacketCollector(
new PacketIDFilter(packet.getPacketID()));
connection.sendPacket(packet);
IQ response = (IQ)collector.nextResult(SmackConfiguration.getPacketReplyTimeout());
collector.cancel();
if (response == null) {
throw new XMPPException("No response from the server.");
}
// If the server replied with an error, throw an exception.
else if (response.getType() == IQ.Type.ERROR) {
throw new XMPPException(response.getError());
}
else {
}
}
/**
* Returns a count of the entries in the roster.
*
* @return the number of entries in the roster.
*/
public int getEntryCount() {
HashMap entryMap = new HashMap();
// Loop through all roster groups.
for (Iterator groups = getGroups(); groups.hasNext(); ) {
RosterGroup rosterGroup = (RosterGroup) groups.next();
for (Iterator entries = rosterGroup.getEntries(); entries.hasNext(); ) {
entryMap.put(entries.next(), "");
}
}
synchronized (unfiledEntries) {
return entryMap.size() + unfiledEntries.size();
}
}
/**
* Returns all entries in the roster, including entries that don't belong to
* any groups.
*
* @return all entries in the roster.
*/
public Iterator getEntries() {
ArrayList allEntries = new ArrayList();
// Loop through all roster groups and add their entries to the answer
for (Iterator groups = getGroups(); groups.hasNext(); ) {
RosterGroup rosterGroup = (RosterGroup) groups.next();
for (Iterator entries = rosterGroup.getEntries(); entries.hasNext(); ) {
RosterEntry entry = (RosterEntry)entries.next();
if (!allEntries.contains(entry)) {
allEntries.add(entry);
}
}
}
// Add the roster unfiled entries to the answer
synchronized (unfiledEntries) {
allEntries.addAll(unfiledEntries);
}
return allEntries.iterator();
}
/**
* Returns a count of the unfiled entries in the roster. An unfiled entry is
* an entry that doesn't belong to any groups.
*
* @return the number of unfiled entries in the roster.
*/
public int getUnfiledEntryCount() {
synchronized (unfiledEntries) {
return unfiledEntries.size();
}
}
/**
* Returns an Iterator for the unfiled roster entries. An unfiled entry is
* an entry that doesn't belong to any groups.
*
* @return an iterator the unfiled roster entries.
*/
public Iterator getUnfiledEntries() {
synchronized (unfiledEntries) {
return Collections.unmodifiableList(new ArrayList(unfiledEntries)).iterator();
}
}
/**
* Returns the roster entry associated with the given XMPP address or
* <tt>null</tt> if the user is not an entry in the roster.
*
* @param user the XMPP address of the user (eg "jsmith@example.com"). The address could be
* in any valid format (e.g. "domain/resource", "user@domain" or "user@domain/resource").
* @return the roster entry or <tt>null</tt> if it does not exist.
*/
public RosterEntry getEntry(String user) {
if (user == null) {
return null;
}
synchronized (entries) {
for (Iterator i=entries.iterator(); i.hasNext(); ) {
RosterEntry entry = (RosterEntry)i.next();
if (entry.getUser().toLowerCase().equals(user.toLowerCase())) {
return entry;
}
}
}
return null;
}
/**
* Returns true if the specified XMPP address is an entry in the roster.
*
* @param user the XMPP address of the user (eg "jsmith@example.com"). The address could be
* in any valid format (e.g. "domain/resource", "user@domain" or "user@domain/resource").
* @return true if the XMPP address is an entry in the roster.
*/
public boolean contains(String user) {
if (user == null) {
return false;
}
synchronized (entries) {
for (Iterator i=entries.iterator(); i.hasNext(); ) {
RosterEntry entry = (RosterEntry)i.next();
if (entry.getUser().toLowerCase().equals(user.toLowerCase())) {
return true;
}
}
}
return false;
}
/**
* Returns the roster group with the specified name, or <tt>null</tt> if the
* group doesn't exist.
*
* @param name the name of the group.
* @return the roster group with the specified name.
*/
public RosterGroup getGroup(String name) {
synchronized (groups) {
return (RosterGroup)groups.get(name);
}
}
/**
* Returns the number of the groups in the roster.
*
* @return the number of groups in the roster.
*/
public int getGroupCount() {
synchronized (groups) {
return groups.size();
}
}
/**
* Returns an iterator the for all the roster groups.
*
* @return an iterator for all roster groups.
*/
public Iterator getGroups() {
synchronized (groups) {
List groupsList = Collections.unmodifiableList(new ArrayList(groups.values()));
return groupsList.iterator();
}
}
/**
* Returns the presence info for a particular user, or <tt>null</tt> if the user
* is unavailable (offline) or if no presence information is available, such as
* when you are not subscribed to the user's presence updates.<p>
*
* If the user has several presences (one for each resource) then answer the presence
* with the highest priority.
*
* @param user a fully qualified xmpp ID. The address could be in any valid format (e.g.
* "domain/resource", "user@domain" or "user@domain/resource").
* @return the user's current presence, or <tt>null</tt> if the user is unavailable
* or if no presence information is available..
*/
public Presence getPresence(String user) {
String key = getPresenceMapKey(user);
Map userPresences = (Map) presenceMap.get(key);
if (userPresences == null) {
return null;
}
else {
// Find the resource with the highest priority
// Might be changed to use the resource with the highest availability instead.
Iterator 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;
}
}
}
return presence;
}
}
/**
* Returns the presence info for a particular user's resource, or <tt>null</tt> if the user
* is unavailable (offline) or if no presence information is available, such as
* when you are not subscribed to the user's presence updates.
*
* @param userResource a fully qualified xmpp ID including a resource.
* @return the user's current presence, or <tt>null</tt> if the user is unavailable
* or if no presence information is available.
*/
public Presence getPresenceResource(String userResource) {
String key = getPresenceMapKey(userResource);
String resource = StringUtils.parseResource(userResource);
Map userPresences = (Map)presenceMap.get(key);
if (userPresences == null) {
return null;
}
else {
return (Presence) userPresences.get(resource);
}
}
/**
* Returns an iterator (of Presence objects) for all the user's current presences
* or <tt>null</tt> if the user is unavailable (offline) or if no presence information
* is available, such as when you are not subscribed to the user's presence updates.
*
* @param user a fully qualified xmpp ID, e.g. jdoe@example.com
* @return an iterator (of Presence objects) for all the user's current presences,
* or <tt>null</tt> if the user is unavailable or if no presence information
* is available.
*/
public Iterator getPresences(String user) {
String key = getPresenceMapKey(user);
Map userPresences = (Map)presenceMap.get(key);
if (userPresences == null) {
return null;
}
else {
synchronized (userPresences) {
return new HashMap(userPresences).values().iterator();
}
}
}
/**
* 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);
}
return key;
}
/**
* Fires roster changed event to roster listeners.
*/
private void fireRosterChangedEvent() {
RosterListener [] listeners = null;
synchronized (rosterListeners) {
listeners = new RosterListener[rosterListeners.size()];
rosterListeners.toArray(listeners);
}
for (int i=0; i<listeners.length; i++) {
listeners[i].rosterModified();
}
}
/**
* Fires roster presence changed event to roster listeners.
*/
private void fireRosterPresenceEvent(String user) {
RosterListener [] listeners = null;
synchronized (rosterListeners) {
listeners = new RosterListener[rosterListeners.size()];
rosterListeners.toArray(listeners);
}
for (int i=0; i<listeners.length; i++) {
listeners[i].presenceChanged(user);
}
}
/**
* 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();
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) {
Map userPresences;
// Get the user presence map
if (presenceMap.get(key) == null) {
userPresences = new HashMap();
presenceMap.put(key, userPresences);
}
else {
userPresences = (Map)presenceMap.get(key);
}
// Add the new presence, using the resources as a key.
synchronized (userPresences) {
userPresences.put(StringUtils.parseResource(from), presence);
}
// If the user is in the roster, fire an event.
synchronized (entries) {
for (Iterator i = entries.iterator(); i.hasNext();) {
RosterEntry entry = (RosterEntry) i.next();
if (entry.getUser().toLowerCase().equals(key.toLowerCase())) {
fireRosterPresenceEvent(from);
}
}
}
}
// If an "unavailable" packet, remove any entries in the presence map.
else if (presence.getType() == Presence.Type.UNAVAILABLE) {
if (presenceMap.get(key) != null) {
Map userPresences = (Map) presenceMap.get(key);
synchronized (userPresences) {
userPresences.remove(StringUtils.parseResource(from));
}
if (userPresences.isEmpty()) {
presenceMap.remove(key);
}
}
// If the user is in the roster, fire an event.
synchronized (entries) {
for (Iterator i=entries.iterator(); i.hasNext(); ) {
RosterEntry entry = (RosterEntry)i.next();
if (entry.getUser().toLowerCase().equals(key.toLowerCase())) {
fireRosterPresenceEvent(from);
}
}
}
}
else if (presence.getType() == Presence.Type.SUBSCRIBE) {
if (subscriptionMode == SUBSCRIPTION_ACCEPT_ALL) {
// Accept all subscription requests.
Presence response = new Presence(Presence.Type.SUBSCRIBED);
response.setTo(presence.getFrom());
connection.sendPacket(response);
}
else if (subscriptionMode == SUBSCRIPTION_REJECT_ALL) {
// Reject all subscription requests.
Presence response = new Presence(Presence.Type.UNSUBSCRIBED);
response.setTo(presence.getFrom());
connection.sendPacket(response);
}
// Otherwise, in manual mode so ignore.
}
}
}
/**
* Listens for all roster packets and processes them.
*/
private class RosterPacketListener implements PacketListener {
public void processPacket(Packet packet) {
RosterPacket rosterPacket = (RosterPacket)packet;
for (Iterator i=rosterPacket.getRosterItems(); i.hasNext(); ) {
RosterPacket.Item item = (RosterPacket.Item)i.next();
RosterEntry entry = new RosterEntry(item.getUser(), item.getName(),
item.getItemType(), connection);
// If the packet is of the type REMOVE then remove the entry
if (RosterPacket.ItemType.REMOVE.equals(item.getItemType())) {
// Remove the entry from the entry list.
if (entries.contains(entry)) {
entries.remove(entry);
}
// Remove the entry from the unfiled entry list.
synchronized (unfiledEntries) {
if (unfiledEntries.contains(entry)) {
unfiledEntries.remove(entry);
}
}
// Removing the user from the roster, so remove any presence information
// about them.
String key = StringUtils.parseName(item.getUser()) + "@" +
StringUtils.parseServer(item.getUser());
presenceMap.remove(key);
}
else {
// Make sure the entry is in the entry list.
if (!entries.contains(entry)) {
entries.add(entry);
}
else {
// If the entry was in then list then update its state with the new values
RosterEntry existingEntry =
(RosterEntry) entries.get(entries.indexOf(entry));
existingEntry.updateState(entry.getName(), entry.getType());
}
// If the roster entry belongs to any groups, remove it from the
// list of unfiled entries.
if (item.getGroupNames().hasNext()) {
synchronized (unfiledEntries) {
unfiledEntries.remove(entry);
}
}
// Otherwise add it to the list of unfiled entries.
else {
synchronized (unfiledEntries) {
if (!unfiledEntries.contains(entry)) {
unfiledEntries.add(entry);
}
}
}
}
// Find the list of groups that the user currently belongs to.
List currentGroupNames = new ArrayList();
for (Iterator j = entry.getGroups(); j.hasNext(); ) {
RosterGroup group = (RosterGroup)j.next();
currentGroupNames.add(group.getName());
}
// If the packet is not of the type REMOVE then add the entry to the groups
if (!RosterPacket.ItemType.REMOVE.equals(item.getItemType())) {
// Create the new list of groups the user belongs to.
List newGroupNames = new ArrayList();
for (Iterator k = item.getGroupNames(); k.hasNext(); ) {
String groupName = (String)k.next();
// Add the group name to the list.
newGroupNames.add(groupName);
// Add the entry to the group.
RosterGroup group = getGroup(groupName);
if (group == null) {
group = createGroup(groupName);
groups.put(groupName, group);
}
// Add the entry.
group.addEntryLocal(entry);
}
// We have the list of old and new group names. We now need to
// remove the entry from the all the groups it may no longer belong
// to. We do this by subracting the new group set from the old.
for (int m=0; m<newGroupNames.size(); m++) {
currentGroupNames.remove(newGroupNames.get(m));
}
}
// Loop through any groups that remain and remove the entries.
// This is neccessary for the case of remote entry removals.
for (int n=0; n<currentGroupNames.size(); n++) {
String groupName = (String)currentGroupNames.get(n);
RosterGroup group = getGroup(groupName);
group.removeEntryLocal(entry);
if (group.getEntryCount() == 0) {
synchronized (groups) {
groups.remove(groupName);
}
}
}
// Remove all the groups with no entries. We have to do this because
// RosterGroup.removeEntry removes the entry immediately (locally) and the
// group could remain empty.
// TODO Check the performance/logic for rosters with large number of groups
for (Iterator it = getGroups(); it.hasNext();) {
RosterGroup group = (RosterGroup)it.next();
if (group.getEntryCount() == 0) {
synchronized (groups) {
groups.remove(group.getName());
}
}
}
}
// Mark the roster as initialized.
synchronized (Roster.this) {
rosterInitialized = true;
Roster.this.notifyAll();
}
// Fire event for roster listeners.
fireRosterChangedEvent();
}
}
}
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