com.hp.hpl.jena.graph
Interface GraphEventManager

All Superinterfaces:

GraphListener

public interface GraphEventManager

extends GraphListener

The component of a graph responsible for managing events and listeners. The interface extends GraphListener because most of the notificiations are the same; the special case to note is that an event manager expects to be handed iterator events as lists, not as iterators.

Author:

kers

Method Summary

boolean	listening() Answer true iff there is at least one attached listener.
void	notifyAddIterator(java.util.List triples) Notify all attached listeners that an iterator [of triples] has been added to the graph; its content has been captured in the list triples.
void	notifyDeleteIterator(java.util.List triples) Notify all attached listeners that an iterator [of triples] has been removed from the graph; its content has been captured in the list triples.
GraphEventManager	register(GraphListener listener) Attached listener to this manager; notification events sent to the manager are sent to all registered listeners.
GraphEventManager	unregister(GraphListener listener) If listener is attached to this manager, detach it, otherwise do nothing.

Methods inherited from interface com.hp.hpl.jena.graph.GraphListener

notifyAddArray, notifyAddGraph, notifyAddIterator, notifyAddList, notifyAddTriple, notifyDeleteArray, notifyDeleteGraph, notifyDeleteIterator, notifyDeleteList, notifyDeleteTriple

Method Detail

register

public GraphEventManager register(GraphListener listener)

Attached listener to this manager; notification events sent to the manager are sent to all registered listeners. A listener may be registered multiple times, in which case it's called multiple times per event.

Parameters:

listener - a listener to be fed events

Returns:

this manager, for cascading

unregister

public GraphEventManager unregister(GraphListener listener)

If listener is attached to this manager, detach it, otherwise do nothing. Only a single registration is removed.

Parameters:

listener - the listener to be detached from the graph

Returns:

this manager, for cascading

listening

public boolean listening()

Answer true iff there is at least one attached listener.

Returns:

true iff there is at least one attached listener

notifyAddIterator

public void notifyAddIterator(java.util.List triples)

Notify all attached listeners that an iterator [of triples] has been added to the graph; its content has been captured in the list triples.

notifyDeleteIterator

public void notifyDeleteIterator(java.util.List triples)

Notify all attached listeners that an iterator [of triples] has been removed from the graph; its content has been captured in the list triples.