tigase.xmpp.impl

## Class JabberIqRoster

- java.lang.Object
- - tigase.xmpp.XMPPProcessor
  - - tigase.xmpp.impl.JabberIqRoster

- All Implemented Interfaces:
    Comparable<XMPPImplIfc>, XMPPImplIfc, XMPPProcessorIfc

      public class JabberIqRoster
      extends XMPPProcessor
      implements XMPPProcessorIfc

  Class `JabberIqRoster` implements part of RFC-3921 - XMPP Instant Messaging specification describing roster management. 7. Roster Management Created: Tue Feb 21 17:42:53 2006
  Version:
    $Rev$
  Author:
    Artur Hefczyc

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `ANON` Field description
    `protected RosterAbstract` | `roster_util` instance of class implementing `RosterAbstract`

    - ### Fields inherited from class tigase.xmpp.XMPPProcessor

      `ALL_NAMES, ALL_PATHS, cmpInfo`

    - ### Fields inherited from interface tigase.xmpp.XMPPImplIfc

      `CLIENT_XMLNS`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `JabberIqRoster()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `int` | `concurrentQueuesNo()` Methods returns a preferable number of threads/packets queues for the plugin.
    `protected static void` | `dynamicGetRequest(Packet packet, XMPPResourceConnection session, Queue<Packet> results, Map<String,Object> settings)` Method processes roster `get` request related to dynamic roster.
    `protected static void` | `dynamicSetRequest(Packet packet, XMPPResourceConnection session, Queue<Packet> results, Map<String,Object> settings)` Method processes roster `set` request related to dynamic roster.
    `static String[]` | `getItemGroups(tigase.xml.Element item)` Returns an array of group names retrieved from Element item
    `protected RosterAbstract` | `getRosterUtil()` Returns shared instance of class implementing `RosterAbstract` - either default one (`RosterFlat`) or the one configured with "roster-implementation" property.
    `String` | `id()` Method `id` returns a unique ID of the plugin.
    `void` | `init(Map<String,Object> settings)` Method `init` is called just after the plugin has been loaded into memory.
    `void` | `process(Packet packet, XMPPResourceConnection session, NonAuthUserRepository repo, Queue<Packet> results, Map<String,Object> settings)` Performs processing of IQ packets with jabber:iq:roster xmlns with the regard whether it's roster set or get request or possibly dynamic-roster is involved.
    `protected void` | `processGetRequest(Packet packet, XMPPResourceConnection session, Queue<Packet> results, Map<String,Object> settings)` Method processes roster `get` request.
    `protected void` | `processSetRequest(Packet packet, XMPPResourceConnection session, Queue<Packet> results, Map<String,Object> settings)` Method processes roster `set` request.
    `tigase.xml.Element[]` | `supDiscoFeatures(XMPPResourceConnection session)` Method `supDiscoFeatures` returns an array of XML `Element`s with service discovery features which have to be returned to the client uppon request.
    `String[][]` | `supElementNamePaths()` Method `supElementNamePaths` returns an array of element names in form of a full path to the XML element for stanzas which can be processed by this plugin.
    `String[]` | `supNamespaces()` Method `supNamespaces` returns an array of name-spaces for stanzas which can be processed by this plugin.
    `tigase.xml.Element[]` | `supStreamFeatures(XMPPResourceConnection session)` Method `supStreamFeatures` returns an array of XML `Element`s with stream features which have to be returned to the client uppon request.
    `protected void` | `updateHash(XMPPResourceConnection session, Map<String,Object> settings)` Calculates hash value based on the user roster items and saves it to user's session data.

    - ### Methods inherited from class tigase.xmpp.XMPPProcessor

      `canHandle, compareTo, concurrentThreadsPerQueue, getComponentInfo, getInstance, getStatistics, isSupporting, supElements, supTypes, toString`

    - ### Methods inherited from class java.lang.Object

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

    - ### Methods inherited from interface tigase.xmpp.XMPPImplIfc

      `canHandle, concurrentThreadsPerQueue, getComponentInfo, getStatistics, isSupporting, supElements, supTypes`

    - ### Methods inherited from interface java.lang.Comparable

      `compareTo`

- - ### Field Detail

    - #### ANON

          public static final String ANON

      Field description
      See Also:
        Constant Field Values

    - #### roster_util

          protected RosterAbstract roster_util

      instance of class implementing `RosterAbstract`

  - ### Constructor Detail

    - #### JabberIqRoster

          public JabberIqRoster()

  - ### Method Detail

    - #### concurrentQueuesNo

          public int concurrentQueuesNo()

      Description copied from interface: `XMPPImplIfc`
      Methods returns a preferable number of threads/packets queues for the plugin. This number can be overwritten through configuration settings, however, a default value should be reasonably good for most standard installations. It is recommended to assign at least as much as twice a number of CPUs cores for I/O bound processing and number a number equal to CPUs cores for fast processing not slowed down by any I/O.
      Specified by:
        `concurrentQueuesNo` in interface `XMPPImplIfc`
      Overrides:
        `concurrentQueuesNo` in class `XMPPProcessor`
      Returns:
        an integer preferred number of processing threads for the plugin.

    - #### id

          public String id()

      Description copied from interface: `XMPPImplIfc`
      Method `id` returns a unique ID of the plugin. Each plugin has own, unique ID which is used in the configuration file to determine whether it needs to be loaded or not. In most cases the ID can be equal to XMLNS of the packages processed by the plugin.
      Specified by:
        `id` in interface `XMPPImplIfc`
      Returns:
        a `String` value

    - #### init

          public void init(Map<String,Object> settings)
                    throws TigaseDBException

      Description copied from interface: `XMPPImplIfc`
      Method `init` is called just after the plugin has been loaded into memory. The idea behind this is to allow it to initialize or check the database. This might be especially useful for plugins which want to have a database access via non-standard stored procedures or need schema upgrade.
      Specified by:
        `init` in interface `XMPPImplIfc`
      Overrides:
        `init` in class `XMPPProcessor`
      Parameters:
        `settings` - is a Map with initial processor settings from the configuration file.
      Throws:
        `TigaseDBException`

    - #### process

          public void process(Packet packet,
                     XMPPResourceConnection session,
                     NonAuthUserRepository repo,
                     Queue<Packet> results,
                     Map<String,Object> settings)
                       throws XMPPException

      Performs processing of IQ packets with jabber:iq:roster xmlns with the regard whether it's roster set or get request or possibly dynamic-roster is involved. request.

      Specified by:
        `process` in interface `XMPPProcessorIfc`
      Parameters:
        `packet` - packet is which being processed. This parameter may never be null. Even though this is not immutable object it mustn't be altered. None of it's fields or attributes can be changed during processing.
        `session` - user session which keeps all the user session data and also gives an access to the user's repository data. It allows for storing information in a permanent storage or in memory only during the live of the online session. This parameter can be null if there is no online user session at the time of the packet processing.
        `repo` - this is a user data storage which is normally used when the user session (parameter above) is null. This is repository allows for a very restricted access only. It allows for storing some user private data (doesn't allow overwriting existing data) like messages for offline users and it also allows for reading user public data like VCard.
        `results` - this a collection with packets which have been generated as input packet processing results. Regardless a response to a user request is sent or the packet is forwarded to it's destination it is always required that a copy of the input packet is created and stored in the results queue.
        `settings` - this map keeps plugin specific settings loaded from the Tigase server configuration. In most cases it is unused, however if the plugin needs to access an external database that this is a way to pass database connection string to the plugin.
      Throws:
        `XMPPException`

    - #### supDiscoFeatures

          public tigase.xml.Element[] supDiscoFeatures(XMPPResourceConnection session)

      Description copied from interface: `XMPPImplIfc`
      Method `supDiscoFeatures` returns an array of XML `Element`s with service discovery features which have to be returned to the client uppon request. Service discovery features returned by this method correspond to services supported by this plugin.
      Specified by:
        `supDiscoFeatures` in interface `XMPPImplIfc`
      Overrides:
        `supDiscoFeatures` in class `XMPPProcessor`
      Parameters:
        `session` - a `XMPPResourceConnection` value
      Returns:
        an `Element[]` value

    - #### supElementNamePaths

          public String[][] supElementNamePaths()

      Description copied from interface: `XMPPImplIfc`
      Method `supElementNamePaths` returns an array of element names in form of a full path to the XML element for stanzas which can be processed by this plugin. Each element name path corresponds to XMLNS returned in array by `supNamespaces()` method. The element path itself is represented by a String array with each path element as a separate String.
      Specified by:
        `supElementNamePaths` in interface `XMPPImplIfc`
      Overrides:
        `supElementNamePaths` in class `XMPPProcessor`
      Returns:
        a `String[][]` value is an array for element paths for which the plugin offers processing capabilities. Each path is in form of a String array in order to reduce parsing overhead.

    - #### supNamespaces

          public String[] supNamespaces()

      Description copied from interface: `XMPPImplIfc`
      Method `supNamespaces` returns an array of name-spaces for stanzas which can be processed by this plugin. Each namespace corresponds to element name returned in array by `supElemenets()` method.
      Specified by:
        `supNamespaces` in interface `XMPPImplIfc`
      Overrides:
        `supNamespaces` in class `XMPPProcessor`
      Returns:
        a `String[]` value

    - #### supStreamFeatures

          public tigase.xml.Element[] supStreamFeatures(XMPPResourceConnection session)

      Description copied from interface: `XMPPImplIfc`
      Method `supStreamFeatures` returns an array of XML `Element`s with stream features which have to be returned to the client uppon request. Stream features returned by this method correspond to features supported by this plugin.
      Specified by:
        `supStreamFeatures` in interface `XMPPImplIfc`
      Overrides:
        `supStreamFeatures` in class `XMPPProcessor`
      Parameters:
        `session` - a `XMPPResourceConnection` value
      Returns:
        an `Element[]` value

    - #### getItemGroups

          public static String[] getItemGroups(tigase.xml.Element item)

      Returns an array of group names retrieved from Element item
      Parameters:
        `item` - from which groups should be obtained
      Returns:
        an array of group names retrieved from Element item

    - #### dynamicGetRequest

          protected static void dynamicGetRequest(Packet packet,
                               XMPPResourceConnection session,
                               Queue<Packet> results,
                               Map<String,Object> settings)
                                           throws NotAuthorizedException

      Method processes roster `get` request related to dynamic roster. Generates output packet with data from the DynamicRoster implementation for every itemelement from processed packet or error otherwise.
      Parameters:
        `packet` - packet is which being processed.
        `session` - user session which keeps all the user session data and also gives an access to the user's repository data.
        `results` - this a collection with packets which have been generated as input packet processing results.
        `settings` - this map keeps plugin specific settings loaded from the Tigase server configuration.
      Throws:
        `NotAuthorizedException`

    - #### dynamicSetRequest

          protected static void dynamicSetRequest(Packet packet,
                               XMPPResourceConnection session,
                               Queue<Packet> results,
                               Map<String,Object> settings)

      Method processes roster `set` request related to dynamic roster. Sets extra data for every itemelement from processed packet with the DynamicRoster implementation and generates success packet or, in case of failure generates error.
      Parameters:
        `packet` - packet is which being processed.
        `session` - user session which keeps all the user session data and also gives an access to the user's repository data.
        `results` - this a collection with packets which have been generated as input packet processing results.
        `settings` - this map keeps plugin specific settings loaded from the Tigase server configuration.

    - #### processGetRequest

          protected void processGetRequest(Packet packet,
                               XMPPResourceConnection session,
                               Queue<Packet> results,
                               Map<String,Object> settings)
                                    throws NotAuthorizedException,
                                           TigaseDBException,
                                           RosterRetrievingException,
                                           RepositoryAccessException

      Method processes roster `get` request. Generates output result packet containing user roster items also considering roster version attribute to minimise traffic.
      Parameters:
        `packet` - packet is which being processed.
        `session` - user session which keeps all the user session data and also gives an access to the user's repository data.
        `results` - this a collection with packets which have been generated as input packet processing results.
        `settings` - this map keeps plugin specific settings loaded from the Tigase server configuration.
      Throws:
        `NotAuthorizedException`
        `RepositoryAccessException`
        `RosterRetrievingException`
        `TigaseDBException`

    - #### processSetRequest

          protected void processSetRequest(Packet packet,
                               XMPPResourceConnection session,
                               Queue<Packet> results,
                               Map<String,Object> settings)
                                    throws XMPPException,
                                           NotAuthorizedException,
                                           TigaseDBException

      Method processes roster `set` request. Performs modifications of user roster.
      Parameters:
        `packet` - packet is which being processed.
        `session` - user session which keeps all the user session data and also gives an access to the user's repository data.
        `results` - this a collection with packets which have been generated as input packet processing results.
        `settings` - this map keeps plugin specific settings loaded from the Tigase server configuration.
      Throws:
        `NotAuthorizedException`
        `TigaseDBException`
        `XMPPException`

    - #### updateHash

          protected void updateHash(XMPPResourceConnection session,
                        Map<String,Object> settings)
                             throws NotAuthorizedException,
                                    TigaseDBException,
                                    RosterRetrievingException,
                                    RepositoryAccessException

      Calculates hash value based on the user roster items and saves it to user's session data.
      Parameters:
        `session` - user session which keeps all the user session data and also gives an access to the user's repository data.
        `settings` - this map keeps plugin specific settings loaded from the Tigase server configuration.
      Throws:
        `NotAuthorizedException`
        `RepositoryAccessException`
        `RosterRetrievingException`
        `TigaseDBException`

    - #### getRosterUtil

          protected RosterAbstract getRosterUtil()

      Returns shared instance of class implementing `RosterAbstract` - either default one (`RosterFlat`) or the one configured with "roster-implementation" property.
      Returns:
        a shared instance of class implementing `RosterAbstract`

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