org.apache.jena.graph.compose

Class Delta

java.lang.Object

org.apache.jena.graph.impl.GraphBase

org.apache.jena.graph.compose.CompositionBase

org.apache.jena.graph.compose.Delta

All Implemented Interfaces:

Graph, GraphWithPerform

public class Delta
extends CompositionBase
implements Graph

Graph operation for wrapping a base graph and leaving it unchanged while recording all the attempted updates for later access. The behavior of this class is not well defined if triples are added to or removed from the base graph, the additions graph, or the deletions graph while this graph is in use.

Field Summary

Fields inherited from class org.apache.jena.graph.impl.GraphBase

TOSTRING_TRIPLE_BASE, TOSTRING_TRIPLE_LIMIT

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

emptyGraph

Constructor Summary

Constructors

Constructor and Description
Delta(Graph base)

Method Summary

Modifier and Type	Method and Description
void	close() Close this graph.
Graph	getAdditions() Answer the graph of all triples added.
Capabilities	getCapabilities() Answer the capabilities of this graph; the default is an AllCapabilities object (the same one each time, not that it matters - Capabilities should be immutable).
Graph	getDeletions() Answer the graph of all triples removed.
int	graphBaseSize() Answer the number of triples in this graph.
void	performAdd(Triple t) Add the triple to the graph, ie add it to the additions, remove it from the removals.
void	performDelete(Triple t) Remove the triple, ie, remove it from the adds, add it to the removals.

Methods inherited from class org.apache.jena.graph.compose.CompositionBase

butNot, ifIn, ifIn, recording, reject, rejecting, rejecting

Methods inherited from class org.apache.jena.graph.impl.GraphBase

add, clear, contains, contains, delete, dependsOn, find, find, forTestingOnly_graphBaseFind, getEventManager, getPrefixMapping, getStatisticsHandler, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, notifyAdd, notifyDelete, remove, size, toString, toString

Methods inherited from class java.lang.Object

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

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

add, clear, contains, contains, delete, dependsOn, find, find, find, getEventManager, getPrefixMapping, getStatisticsHandler, getTransactionHandler, isClosed, isEmpty, isIsomorphicWith, remove, size

Constructor Detail

Delta

public Delta(Graph base)

Method Detail

getCapabilities

public Capabilities getCapabilities()

Description copied from class: GraphBase

Answer the capabilities of this graph; the default is an AllCapabilities object (the same one each time, not that it matters - Capabilities should be immutable).

Specified by:

getCapabilities in interface Graph

Overrides:

getCapabilities in class GraphBase

getAdditions

public Graph getAdditions()

Answer the graph of all triples added.

getDeletions

public Graph getDeletions()

Answer the graph of all triples removed.

performAdd

public void performAdd(Triple t)

Add the triple to the graph, ie add it to the additions, remove it from the removals.

Specified by:

performAdd in interface GraphWithPerform

Overrides:

performAdd in class GraphBase

performDelete

public void performDelete(Triple t)

Remove the triple, ie, remove it from the adds, add it to the removals.

Specified by:

performDelete in interface GraphWithPerform

Overrides:

performDelete in class GraphBase

close

public void close()

Description copied from class: GraphBase

Close this graph. Subgraphs may extend to discard resources.

Specified by:

close in interface Graph

Overrides:

close in class GraphBase

graphBaseSize

public int graphBaseSize()

Description copied from class: GraphBase

Answer the number of triples in this graph. Default implementation counts its way through the results of a findAll. Subclasses must override if they want size() to be efficient.