Package org.apache.jena.graph.impl

Class SimpleEventManager

java.lang.Object

org.apache.jena.graph.impl.SimpleEventManager

All Implemented Interfaces:

GraphEventManager, GraphListener

public class SimpleEventManager
extends java.lang.Object
implements GraphEventManager

Simple implementation of GraphEventManager for GraphBase to use. The listeners are held as an [Array]List.

This class also holds the utility method notifyingRemove, which wraps iterators so that their .remove() operation notifies the specified graph of the removal.

Constructor Summary

Constructors

Constructor	Description
SimpleEventManager()

Method Summary

Modifier and Type	Method	Description
boolean	listening()	Answer true iff there is at least one attached listener.
void	notifyAddArray(Graph g, Triple[] ts)	Method called when an array of triples has been added to the graph.
void	notifyAddGraph(Graph g, Graph added)	Method called when another graph g has been used to specify the triples added to our attached graph.
void	notifyAddIterator(Graph g, java.util.Iterator<Triple> it)	Method called when an iterator [of triples] has been added to the graph
void	notifyAddIterator(Graph g, java.util.List<Triple> it)	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	notifyAddList(Graph g, java.util.List<Triple> L)	Method called when a list [of triples] has been added to the graph.
void	notifyAddTriple(Graph g, Triple t)	Method called when a single triple has been added to the graph.
void	notifyDeleteArray(Graph g, Triple[] ts)	Method called when an array of triples has been deleted from the graph.
void	notifyDeleteGraph(Graph g, Graph removed)	Method to call when another graph has been used to specify the triples deleted from our attached graph.
void	notifyDeleteIterator(Graph g, java.util.Iterator<Triple> it)	Method called when an iterator [of triples] has been deleted from the graph.
void	notifyDeleteIterator(Graph g, java.util.List<Triple> L)	Notify all attached listeners that an iterator [of triples] has been removed from the graph; its content has been captured in the list triples.
void	notifyDeleteList(Graph g, java.util.List<Triple> L)	Method called when a list [of triples] has been deleted from the graph.
void	notifyDeleteTriple(Graph g, Triple t)	Method called when a single triple has been deleted from the graph.
void	notifyEvent(Graph source, java.lang.Object event)	method to call for a general event.
static ExtendedIterator<Triple>	notifyingRemove(Graph g, java.util.Iterator<Triple> i)	Answer an iterator which wraps i to ensure that if a .remove() is executed on it, the graph g will be notified.
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 class java.lang.Object

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

Constructor Detail

SimpleEventManager

public SimpleEventManager()

Method Detail

register

public GraphEventManager register(GraphListener listener)

Description copied from interface: GraphEventManager

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. A listener will be notified of an event if it is registered before the Graph method call that initiated the event, and was not unregistered before that method call returned. In addition, a listener may (or may not) be notified of an event if it is registered before such a method returns or is unregistered after such a method is called. For example, it may unregister itself in response to the event. If the registration and/or unregistration occur on different threads the usual thread uncertainties in such statements apply.

Specified by:

register in interface GraphEventManager

Parameters:

listener - a listener to be fed events

Returns:

this manager, for cascading

unregister

public GraphEventManager unregister(GraphListener listener)

Description copied from interface: GraphEventManager

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

Specified by:

unregister in interface GraphEventManager

Parameters:

listener - the listener to be detached from the graph

Returns:

this manager, for cascading

listening

public boolean listening()

Description copied from interface: GraphEventManager

Answer true iff there is at least one attached listener.

Specified by:

listening in interface GraphEventManager

Returns:

true iff there is at least one attached listener

notifyAddTriple

public void notifyAddTriple(Graph g,
                            Triple t)

Description copied from interface: GraphListener

Method called when a single triple has been added to the graph.

Specified by:

notifyAddTriple in interface GraphListener

notifyAddArray

public void notifyAddArray(Graph g,
                           Triple[] ts)

Description copied from interface: GraphListener

Method called when an array of triples has been added to the graph.

Specified by:

notifyAddArray in interface GraphListener

notifyAddList

public void notifyAddList(Graph g,
                          java.util.List<Triple> L)

Description copied from interface: GraphListener

Method called when a list [of triples] has been added to the graph.

Specified by:

notifyAddList in interface GraphListener

notifyAddIterator

public void notifyAddIterator(Graph g,
                              java.util.List<Triple> it)

Description copied from interface: GraphEventManager

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

Specified by:

notifyAddIterator in interface GraphEventManager

notifyAddIterator

public void notifyAddIterator(Graph g,
                              java.util.Iterator<Triple> it)

Description copied from interface: GraphListener

Method called when an iterator [of triples] has been added to the graph

Specified by:

notifyAddIterator in interface GraphListener

notifyAddGraph

public void notifyAddGraph(Graph g,
                           Graph added)

Description copied from interface: GraphListener

Method called when another graph g has been used to specify the triples added to our attached graph.

Specified by:

notifyAddGraph in interface GraphListener

Parameters:

g - the graph of triples added

notifyDeleteTriple

public void notifyDeleteTriple(Graph g,
                               Triple t)

Description copied from interface: GraphListener

Method called when a single triple has been deleted from the graph.

Specified by:

notifyDeleteTriple in interface GraphListener

notifyDeleteArray

public void notifyDeleteArray(Graph g,
                              Triple[] ts)

Description copied from interface: GraphListener

Method called when an array of triples has been deleted from the graph.

Specified by:

notifyDeleteArray in interface GraphListener

notifyDeleteList

public void notifyDeleteList(Graph g,
                             java.util.List<Triple> L)

Description copied from interface: GraphListener

Method called when a list [of triples] has been deleted from the graph.

Specified by:

notifyDeleteList in interface GraphListener

notifyDeleteIterator

public void notifyDeleteIterator(Graph g,
                                 java.util.List<Triple> L)

Description copied from interface: GraphEventManager

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

Specified by:

notifyDeleteIterator in interface GraphEventManager

notifyDeleteIterator

public void notifyDeleteIterator(Graph g,
                                 java.util.Iterator<Triple> it)

Description copied from interface: GraphListener

Method called when an iterator [of triples] has been deleted from the graph.

Specified by:

notifyDeleteIterator in interface GraphListener

notifyDeleteGraph

public void notifyDeleteGraph(Graph g,
                              Graph removed)

Description copied from interface: GraphListener

Method to call when another graph has been used to specify the triples deleted from our attached graph.

Specified by:

notifyDeleteGraph in interface GraphListener

Parameters:

g - the graph of triples added

notifyEvent

public void notifyEvent(Graph source,
                        java.lang.Object event)

Description copied from interface: GraphListener

method to call for a general event. value is usually a GraphEvents. Special attention is drawn to GraphEvents.removeAll and events whose GraphEvents.getTitle() is "remove" (see GraphEvents.remove(Node, Node, Node). Unlike other notifications, the listener cannot tell which triples have been modified, since they have already been deleted by the time this event is sent, and the event does not include a record of them.

Specified by:

notifyEvent in interface GraphListener

notifyingRemove

public static ExtendedIterator<Triple> notifyingRemove(Graph g,
                                                       java.util.Iterator<Triple> i)

Answer an iterator which wraps i to ensure that if a .remove() is executed on it, the graph g will be notified.