Package org.aksw.jena_sparql_api.collection.observable

Class ObservableGraphImpl

java.lang.Object

org.apache.jena.sparql.graph.GraphWrapper

org.aksw.jena_sparql_api.collection.observable.ObservableGraphImpl

All Implemented Interfaces:

ObservableGraph, org.apache.jena.graph.Graph

public class ObservableGraphImpl
extends org.apache.jena.sparql.graph.GraphWrapper
implements ObservableGraph

A graph wrapper that overrides the add(Triple) and delete(Triple) methods such that duplicate insertions and removals are suppressed and thus do not fire superfluous events. More importantly, the addPropertyChangeListener(PropertyChangeListener) method is provided which fires events BEFORE changes occur on the graph. Hence, the old state of the graph is accessible during event processing. The raised events are instances of CollectionChangedEventImpl which is a subclass of PropertyChangeEvent. Note that GraphWrapper.getEventManager() fires events AFTER changes already occurred.

Author:

raven

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	CheckFirst	Whether to see if a quad action will change the dataset - test before add for existence, test before delete for absence
protected PropertyChangeSupport	pcs
protected boolean	RecordNoAction	Whether to record a no-op (maybe as a comment)
protected VetoableChangeSupport	vcs

Fields inherited from interface org.apache.jena.graph.Graph

emptyGraph

Constructor Summary

Constructors

Constructor	Description
ObservableGraphImpl(org.apache.jena.graph.Graph delegate)

Method Summary

Modifier and Type	Method	Description
void	add(org.apache.jena.graph.Triple quad)
org.aksw.commons.collection.observable.Registration	addPropertyChangeListener(PropertyChangeListener listener)
Runnable	addVetoableChangeListener(VetoableChangeListener listener)
static boolean	applyDeltaGraph(org.apache.jena.graph.Graph self, org.apache.jena.graph.Graph backend, VetoableChangeSupport vcs, PropertyChangeSupport pcs, boolean clearIntersection, Collection<? extends org.apache.jena.graph.Triple> rawAdditions, Collection<?> rawRemovals)
static ObservableGraphImpl	decorate(org.apache.jena.graph.Graph delegate)
void	delete(org.apache.jena.graph.Triple quad)
static void	deleteAny(org.apache.jena.graph.Graph graph, org.apache.jena.graph.Triple pattern, PropertyChangeSupport pcs)
boolean	delta(Collection<? extends org.apache.jena.graph.Triple> rawAdditions, Collection<?> rawDeletions)
org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.graph.Triple>	find(org.apache.jena.graph.Node s, org.apache.jena.graph.Node p, org.apache.jena.graph.Node o)
void	remove(org.apache.jena.graph.Node s, org.apache.jena.graph.Node p, org.apache.jena.graph.Node o)

Methods inherited from class org.apache.jena.sparql.graph.GraphWrapper

clear, close, contains, contains, find, get, getEventManager, getPrefixMapping, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, size

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.jena.graph.Graph

add, clear, close, contains, contains, delete, find, find, getEventManager, getPrefixMapping, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, size, sizeLong, stream, stream

Methods inherited from interface org.aksw.jena_sparql_api.collection.observable.ObservableGraph

asSet, createSetField, createSetField, createValueField, createValueField

Field Details

CheckFirst

protected boolean CheckFirst

Whether to see if a quad action will change the dataset - test before add for existence, test before delete for absence

RecordNoAction

protected boolean RecordNoAction

Whether to record a no-op (maybe as a comment)

vcs

protected VetoableChangeSupport vcs

pcs

protected PropertyChangeSupport pcs

Constructor Details

ObservableGraphImpl

public ObservableGraphImpl(org.apache.jena.graph.Graph delegate)

Method Details

decorate

public static ObservableGraphImpl decorate(org.apache.jena.graph.Graph delegate)

delta

public boolean delta(Collection<? extends org.apache.jena.graph.Triple> rawAdditions,
 Collection<?> rawDeletions)

Specified by:

delta in interface ObservableGraph

applyDeltaGraph

public static boolean applyDeltaGraph(org.apache.jena.graph.Graph self,
 org.apache.jena.graph.Graph backend,
 VetoableChangeSupport vcs,
 PropertyChangeSupport pcs,
 boolean clearIntersection,
 Collection<? extends org.apache.jena.graph.Triple> rawAdditions,
 Collection<?> rawRemovals)

add

public void add(org.apache.jena.graph.Triple quad)

Specified by:

add in interface org.apache.jena.graph.Graph

Overrides:

add in class org.apache.jena.sparql.graph.GraphWrapper

delete

public void delete(org.apache.jena.graph.Triple quad)

Specified by:

delete in interface org.apache.jena.graph.Graph

Overrides:

delete in class org.apache.jena.sparql.graph.GraphWrapper

remove

public void remove(org.apache.jena.graph.Node s,
 org.apache.jena.graph.Node p,
 org.apache.jena.graph.Node o)

Specified by:

remove in interface org.apache.jena.graph.Graph

Overrides:

remove in class org.apache.jena.sparql.graph.GraphWrapper

deleteAny

public static void deleteAny(org.apache.jena.graph.Graph graph,
 org.apache.jena.graph.Triple pattern,
 PropertyChangeSupport pcs)

addVetoableChangeListener

public Runnable addVetoableChangeListener(VetoableChangeListener listener)

Specified by:

addVetoableChangeListener in interface ObservableGraph

addPropertyChangeListener

public org.aksw.commons.collection.observable.Registration addPropertyChangeListener(PropertyChangeListener listener)

Specified by:

addPropertyChangeListener in interface ObservableGraph

find

public org.apache.jena.util.iterator.ExtendedIterator<org.apache.jena.graph.Triple> find(org.apache.jena.graph.Node s,
 org.apache.jena.graph.Node p,
 org.apache.jena.graph.Node o)

Specified by:

find in interface org.apache.jena.graph.Graph

Overrides:

find in class org.apache.jena.sparql.graph.GraphWrapper