Package org.jivesoftware.smackx.caps

Class EntityCapsManager

java.lang.Object

org.jivesoftware.smack.Manager

org.jivesoftware.smackx.caps.EntityCapsManager

public final class EntityCapsManager
extends Manager

Manages own and others Entity Capabilities (XEP-0115).

Entity Capabilities is an XMPP extension which, in order to minimize network impact, caches the capabilities of remote XMPP entities. Those capabilities are determine with the help of the Service Discovery Protocol (XEP-0030, ServiceDiscoveryManager).

Usage

Entity Capabilities work silently in the background when enabled. If the remote XMPP entity does not support XEP-0115 but XEP-0030 then XEP-0030 mechanisms are transparently used.

The caches used by Smack for Entity Capabilities is non-persistent per default. However, it is is also possible to set a persistent Entity Capabilities cache, which is recommended.

Examples

Enable Entity Capabilities

 // Get an instance of entity caps manager for the specified connection
 EntityCapsManager mgr = EntityCapsManager.getInstanceFor(connection);
 // Enable entity capabilities
 mgr.enableEntityCaps();
 

Configure a persistent cache for Entity Capabilities

 // Get an instance of entity caps manager for the specified connection
 EntityCapsManager mgr = EntityCapsManager.getInstanceFor(connection);
 // Create an cache, see smackx.entitycaps.cache for pre-defined cache implementations
 EntityCapsPersistentCache cache = new SimpleDirectoryPersistentCache(new File("/foo/cachedir"));
 // Set the cache
 mgr.setPersistentCache(cache);
 

See Also:

• XEP-0115: Entity Capabilities

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	EntityCapsManager.NodeVerHash

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ELEMENT
static final String	NAMESPACE

Method Summary

Modifier and Type	Method	Description
boolean	areEntityCapsSupported(Jid jid)	Returns true if Entity Caps are supported by a given JID.
boolean	areEntityCapsSupportedByServer()	Returns true if Entity Caps are supported by the local service/server.
static void	clearMemoryCache()	Clears the memory cache.
void	disableEntityCaps()
void	enableEntityCaps()
boolean	entityCapsEnabled()
CapsVersionAndHash	getCapsVersionAndHash()	Get our own caps version or null if none is yet set.
static DiscoverInfo	getDiscoverInfoByUser(Jid user)	Get the discover info given a user name.
static DiscoverInfo	getDiscoveryInfoByNodeVer(String nodeVer)	Retrieve DiscoverInfo for a specific node.
static EntityCapsManager	getInstanceFor(XMPPConnection connection)
String	getLocalNodeVer()	Returns the local entity's NodeVer (e.g.
static EntityCapsManager.NodeVerHash	getNodeVerHashByJid(Jid jid)
static String	getNodeVersionByJid(Jid jid)	Get the Node version (node#ver) of a JID.
static void	removeUserCapsNode(Jid user)	Remove a record telling what entity caps node a user has.
static void	setDefaultEntityNode(String entityNode)	Set the default entity node that will be used for new EntityCapsManagers.
static void	setMaxsCacheSizes(int maxJidToNodeVerSize, int maxCapsCacheSize)	Sets the maximum cache sizes.
static void	setPersistentCache(EntityCapsPersistentCache cache)	Set the persistent cache implementation.
static boolean	verifyDiscoverInfoVersion(String ver, String hash, DiscoverInfo info)	Verify DiscoverInfo and Caps Node as defined in XEP-0115 5.4 Processing Method.

Methods inherited from class org.jivesoftware.smack.Manager

connection, getAuthenticatedConnectionOrThrow, schedule, schedule, scheduleBlocking

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

NAMESPACE

public static final String NAMESPACE

See Also:

• Constant Field Values

ELEMENT

public static final String ELEMENT

See Also:

• Constant Field Values

Method Details

setDefaultEntityNode

public static void setDefaultEntityNode(String entityNode)

Set the default entity node that will be used for new EntityCapsManagers.

Parameters:

entityNode - TODO javadoc me please

getNodeVersionByJid

public static String getNodeVersionByJid(Jid jid)

Get the Node version (node#ver) of a JID. Returns a String or null if EntityCapsManager does not have any information.

Parameters:

jid - TODO javadoc me please the user (Full JID)

Returns:

the node version (node#ver) or null

getNodeVerHashByJid

public static EntityCapsManager.NodeVerHash getNodeVerHashByJid(Jid jid)

getDiscoverInfoByUser

public static DiscoverInfo getDiscoverInfoByUser(Jid user)

Get the discover info given a user name. The discover info is returned if the user has a node#ver associated with it and the node#ver has a discover info associated with it.

Parameters:

user - TODO javadoc me please user name (Full JID)

Returns:

the discovered info

getDiscoveryInfoByNodeVer

public static DiscoverInfo getDiscoveryInfoByNodeVer(String nodeVer)

Retrieve DiscoverInfo for a specific node.

Parameters:

nodeVer - TODO javadoc me please The node name (e.g. "http://psi-im.org#q07IKJEyjvHSyhy//CH0CxmKi8w=").

Returns:

The corresponding DiscoverInfo or null if none is known.

setPersistentCache

public static void setPersistentCache(EntityCapsPersistentCache cache)

Set the persistent cache implementation.

Parameters:

cache - TODO javadoc me please

setMaxsCacheSizes

public static void setMaxsCacheSizes(int maxJidToNodeVerSize,
 int maxCapsCacheSize)

Sets the maximum cache sizes.

Parameters:

maxJidToNodeVerSize - TODO javadoc me please

maxCapsCacheSize - TODO javadoc me please

clearMemoryCache

public static void clearMemoryCache()

Clears the memory cache.

getInstanceFor

public static EntityCapsManager getInstanceFor(XMPPConnection connection)

enableEntityCaps

public void enableEntityCaps()

disableEntityCaps

public void disableEntityCaps()

entityCapsEnabled

public boolean entityCapsEnabled()

removeUserCapsNode

public static void removeUserCapsNode(Jid user)

Remove a record telling what entity caps node a user has.

Parameters:

user - TODO javadoc me please the user (Full JID)

getCapsVersionAndHash

public CapsVersionAndHash getCapsVersionAndHash()

Get our own caps version or null if none is yet set. The version depends on the enabled features. A caps version looks like '66/0NaeaBKkwk85efJTGmU47vXI='

Returns:

our own caps version or null.

getLocalNodeVer

public String getLocalNodeVer()

Returns the local entity's NodeVer (e.g. "http://www.igniterealtime.org/projects/smack/#66/0NaeaBKkwk85efJTGmU47vXI= )

Returns:

the local NodeVer

areEntityCapsSupported

public boolean areEntityCapsSupported(Jid jid)
                               throws SmackException.NoResponseException,
XMPPException.XMPPErrorException,
SmackException.NotConnectedException,
InterruptedException

Returns true if Entity Caps are supported by a given JID.

Parameters:

jid - TODO javadoc me please

Returns:

true if the entity supports Entity Capabilities.

Throws:

XMPPException.XMPPErrorException - if there was an XMPP error returned.

SmackException.NoResponseException - if there was no response from the remote entity.

SmackException.NotConnectedException - if the XMPP connection is not connected.

InterruptedException - if the calling thread was interrupted.

areEntityCapsSupportedByServer

public boolean areEntityCapsSupportedByServer()
                                       throws SmackException.NoResponseException,
XMPPException.XMPPErrorException,
SmackException.NotConnectedException,
InterruptedException

Returns true if Entity Caps are supported by the local service/server.

Returns:

true if the user's server supports Entity Capabilities.

Throws:

XMPPException.XMPPErrorException - if there was an XMPP error returned.

SmackException.NoResponseException - if there was no response from the remote entity.

SmackException.NotConnectedException - if the XMPP connection is not connected.

InterruptedException - if the calling thread was interrupted.

verifyDiscoverInfoVersion

public static boolean verifyDiscoverInfoVersion(String ver,
 String hash,
 DiscoverInfo info)

Verify DiscoverInfo and Caps Node as defined in XEP-0115 5.4 Processing Method.

Parameters:

ver - TODO javadoc me please

hash - TODO javadoc me please

info - TODO javadoc me please

Returns:

true if it's valid and should be cache, false if not

See Also:

• XEP-0115 5.4 Processing Method