org.topbraid.core.instancecount
Class InstanceCountProvider

java.lang.Object
  org.topbraid.core.instancecount.InstanceCountProvider

All Implemented Interfaces:

IInstanceCountProvider

public class InstanceCountProvider
extends java.lang.Object
implements IInstanceCountProvider

The default implementation of IInstanceCountProvider.

Author:

Holger Knublauch

Constructor Summary

InstanceCountProvider()

Method Summary

void	addListener(IInstanceCountListener listener)
void	clear() Resets any cached values.
void	dispose() Should be called to enable this to remove itself as listener.
java.lang.Integer	getInstanceCount(com.hp.hpl.jena.graph.Graph graph, com.hp.hpl.jena.graph.Node classNode) Gets the number of known instances of a given class in a given Graph.
void	refresh(TripleChangeRecord[] records, boolean undone) Called by the IChangeEngine so that this can update the counts from the change records.
void	removeGraph(com.hp.hpl.jena.graph.Graph graph)
void	removeListener(IInstanceCountListener listener)

Methods inherited from class java.lang.Object

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

Constructor Detail

InstanceCountProvider

public InstanceCountProvider()

Method Detail

addListener

public void addListener(IInstanceCountListener listener)

Specified by:

addListener in interface IInstanceCountProvider

clear

public void clear()

Description copied from interface: IInstanceCountProvider

Resets any cached values.

Specified by:

clear in interface IInstanceCountProvider

dispose

public void dispose()

Description copied from interface: IInstanceCountProvider

Should be called to enable this to remove itself as listener.

Specified by:

dispose in interface IInstanceCountProvider

getInstanceCount

public java.lang.Integer getInstanceCount(com.hp.hpl.jena.graph.Graph graph,
                                          com.hp.hpl.jena.graph.Node classNode)

Description copied from interface: IInstanceCountProvider

Gets the number of known instances of a given class in a given Graph.

Specified by:

getInstanceCount in interface IInstanceCountProvider

Parameters:

graph - the Graph to get the number of instances

classNode - the Node of the class

Returns:

the number of instances, null (unknown) or a negative number (e.g. -1 means "at least 1")

refresh

public void refresh(TripleChangeRecord[] records,
                    boolean undone)

Description copied from interface: IInstanceCountProvider

Called by the IChangeEngine so that this can update the counts from the change records.

Specified by:

refresh in interface IInstanceCountProvider

Parameters:

records - the records

undone - true if the records have been undone

removeGraph

public void removeGraph(com.hp.hpl.jena.graph.Graph graph)

Specified by:

removeGraph in interface IInstanceCountProvider

removeListener

public void removeListener(IInstanceCountListener listener)

Specified by:

removeListener in interface IInstanceCountProvider