Package org.jivesoftware.openfire.muc

Class HistoryStrategy

  • public class HistoryStrategy
extends Object

    Multi-User Chat rooms may cache history of the conversations in the room in order to play them back to newly arriving members.

    This class is an internal component of MUCRoomHistory that describes the strategy that can be used, and provides a method of administering the history behavior.

    Author:
    Gaston Dombiak, Derek DeMoro

    • Constructor Detail

      • HistoryStrategy

        public HistoryStrategy​(HistoryStrategy parentStrategy)
        Create a history strategy with the given parent strategy (for defaults) or null if no parent exists.
        Parameters:
        parentStrategy - The parent strategy of this strategy or null if none exists.

    • Method Detail

      • getMaxNumber

        public int getMaxNumber()
        Obtain the maximum number of messages for strategies using message number limitations.
        Returns:
        The maximum number of messages to store in applicable strategies.

      • setMaxNumber

        public void setMaxNumber​(int max)
        Set the maximum number of messages for strategies using message number limitations.
        Parameters:
        max - the maximum number of messages to store in applicable strategies.

      • setType

        public void setType​(HistoryStrategy.Type newType)
        Set the type of history strategy being used.
        Parameters:
        newType - The new type of chat history to use.

      • getType

        public HistoryStrategy.Type getType()
        Obtain the type of history strategy being used.
        Returns:
        The current type of strategy being used.

      • addMessage

        public void addMessage​(org.xmpp.packet.Message packet)
        Add a message to the current chat history. The strategy type will determine what actually happens to the message.
        Parameters:
        packet - The packet to add to the chatroom's history.

      • getMessageHistory

        public Iterator<org.xmpp.packet.Message> getMessageHistory()
        Obtain the current history as an iterator of messages to play back to a new room member.
        Returns:
        An iterator of Message objects to be sent to the new room member.

      • getReverseMessageHistory

        public ListIterator<org.xmpp.packet.Message> getReverseMessageHistory()
        Obtain the current history to be iterated in reverse mode. This means that the returned list iterator will be positioned at the end of the history so senders of this message must traverse the list in reverse mode.
        Returns:
        A list iterator of Message objects positioned at the end of the list.

      • setTypeFromString

        public void setTypeFromString​(String typeName)
        Obtain the strategy type from string name. See the Type enumeration name strings for the names strings supported. If nothing matches and parent is not null, then the default strategy is used. Otherwise the number strategy is used.
        Parameters:
        typeName - the text name of the strategy type.

      • setContext

        public void setContext​(String subdomain,
                       String prefix)
        Sets the prefix to use for retrieving and saving settings (and also triggers an immediate loading of properties).
        Parameters:
        subdomain - the subdomain of the muc service to pull properties for.
        prefix - the prefix to use (without trailing dot) on property names.

      • hasChangedSubject

        public boolean hasChangedSubject()
        Returns true if there is a message within the history of the room that has changed the room's subject.
        Returns:
        true if there is a message within the history of the room that has changed the room's subject.

      • getChangedSubject

        public org.xmpp.packet.Message getChangedSubject()
        Returns the message within the history of the room that has changed the room's subject.
        Returns:
        the latest room subject change or null if none exists yet.

      • isSubjectChangeRequest

        public boolean isSubjectChangeRequest​(org.xmpp.packet.Message message)
        Returns true if the given message qualifies as a subject change request for the target MUC room, per XEP-0045. Note that this does not validate whether the sender has permission to make the change, because subject change requests may be loaded from history or processed "live" during a user's session. Refer to http://xmpp.org/extensions/xep-0045.html#subject-mod for details.
        Parameters:
        message - the message to check
        Returns:
        true if the given packet is a subject change request