Module org.apache.jena.core

Package org.apache.jena.graph.compose

Class MultiUnion

java.lang.Object

org.apache.jena.graph.impl.GraphBase

org.apache.jena.graph.compose.CompositionBase

org.apache.jena.graph.compose.Polyadic

org.apache.jena.graph.compose.MultiUnion

All Implemented Interfaces:

Graph, GraphWithPerform

public class MultiUnion
extends Polyadic

A graph implementation that presents the union of zero or more subgraphs, one of which is distinguished as the updateable graph.

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	Description
MultiUnion()	Construct a union of exactly no sub graphs.
MultiUnion(Iterator<Graph> graphs)	Construct a union of all of the given graphs.
MultiUnion(Graph[] graphs)	Construct a union of all of the given graphs

Method Summary

Modifier and Type	Method	Description
void	addGraph(Graph graph)	Add the given graph to this union.
boolean	graphBaseContains(Triple t)	Answer true if at least one of the graphs in this union contain the given triple.
ExtendedIterator<Triple>	graphBaseFind(Triple t)	Answer an iterator over the triples in the union of the graphs in this composition.
void	performAdd(Triple t)	Add the given triple to the union model; the actual component model to be updated will be the designated (or default) updateable graph.
void	performDelete(Triple t)	Delete the given triple from the union model; the actual component model to be updated will be the designated (or default) updateable graph.

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

close, dependsOn, getBaseGraph, getCapabilities, getRequiredBaseGraph, getSubGraphs, getTransactionHandler, removeGraph, setBaseGraph

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, find, find, forTestingOnly_graphBaseFind, getEventManager, getPrefixMapping, 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, delete, find, sizeLong, stream, stream

Constructor Details

MultiUnion

public MultiUnion()

Construct a union of exactly no sub graphs.

MultiUnion

public MultiUnion(Graph[] graphs)

Construct a union of all of the given graphs

Parameters:

graphs - An array of the sub-graphs of this union

MultiUnion

public MultiUnion(Iterator<Graph> graphs)

Construct a union of all of the given graphs.

Parameters:

graphs - An iterator of the sub-graphs of this union. If graphs is a closable iterator, it will be automatically closed.

Method Details

performAdd

public void performAdd(Triple t)

Add the given triple to the union model; the actual component model to be updated will be the designated (or default) updateable graph.

Specified by:

performAdd in interface GraphWithPerform

Overrides:

performAdd in class GraphBase

Parameters:

t - A triple to add to the union graph

Throws:

JenaException - if the union does not contain any sub-graphs yet

performDelete

public void performDelete(Triple t)

Delete the given triple from the union model; the actual component model to be updated will be the designated (or default) updateable graph.

Specified by:

performDelete in interface GraphWithPerform

Overrides:

performDelete in class GraphBase

Parameters:

t - A triple to from the union graph

Throws:

JenaException - if the union does not contain any sub-graphs yet

graphBaseContains

public boolean graphBaseContains(Triple t)

Answer true if at least one of the graphs in this union contain the given triple.

Parameters:

t - A triple

Returns:

True if any of the graphs in the union contain t

graphBaseFind

public ExtendedIterator<Triple> graphBaseFind(Triple t)

Answer an iterator over the triples in the union of the graphs in this composition. Note that the requirement to remove duplicates from the union means that this will be an expensive operation for large (and especially for persistent) graphs.

Parameters:

t - The matcher to match against

Returns:

An iterator of all triples matching t in the union of the graphs.

addGraph

public void addGraph(Graph graph)

Add the given graph to this union. If it is already a member of the union, don't add it a second time.

Overrides:

addGraph in class Polyadic

Parameters:

graph - A sub-graph to add to this union