Module org.apache.jena.core

Package org.apache.jena.graph.impl

Class GraphPlain

java.lang.Object

org.apache.jena.graph.impl.WrappedGraph

org.apache.jena.graph.impl.GraphPlain

All Implemented Interfaces:

Graph, GraphWithPerform

public class GraphPlain
extends WrappedGraph

A version of Graph that enforces term equality even if the base graph uses value-indexing. With value-indexing, one value may have several object terms that represent it when the graph store RDF terms, and but matches by value.

This only affects the object field of a triple in RDF but in "generalized RDF" literals can appear in any triple slot.

Field Summary

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

emptyGraph

Method Summary

Modifier and Type	Method	Description
boolean	contains(Node s, Node p, Node o)	Answer true iff the graph contains a triple matching (s, p, o).
boolean	contains(Triple t)	Answer true iff the graph contains a triple that t matches; t may be fluid.
ExtendedIterator<Triple>	find(Node subj, Node pred, Node obj)	Returns an iterator over Triples matching a pattern.
ExtendedIterator<Triple>	find(Triple m)	Returns an iterator over all the Triples that match the triple pattern.
Capabilities	getCapabilities()	returns this Graph's capabilities
static Graph	plain()	Return a graph that only has term-equality.
static Graph	plain(Graph base)	Return a graph that only has term-equality and storage in the base graph.
void	remove(Node s, Node p, Node o)	Remove all triples that match by find(s, p, o)
String	toString()

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

add, clear, close, delete, dependsOn, getEventManager, getPrefixMapping, getTransactionHandler, getWrapped, isClosed, isEmpty, isIsomorphicWith, performAdd, performDelete, size

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

Method Details

plain

public static Graph plain(Graph base)

Return a graph that only has term-equality and storage in the base graph. Update affects the base graph.

plain

public static Graph plain()

Return a graph that only has term-equality.

getCapabilities

public Capabilities getCapabilities()

Description copied from interface: Graph

returns this Graph's capabilities

Specified by:

getCapabilities in interface Graph

Overrides:

getCapabilities in class WrappedGraph

remove

public void remove(Node s,
 Node p,
 Node o)

Description copied from interface: Graph

Remove all triples that match by find(s, p, o)

Specified by:

remove in interface Graph

Overrides:

remove in class WrappedGraph

contains

public boolean contains(Triple t)

Description copied from interface: Graph

Answer true iff the graph contains a triple that t matches; t may be fluid.

Specified by:

contains in interface Graph

Overrides:

contains in class WrappedGraph

contains

public boolean contains(Node s,
 Node p,
 Node o)

Description copied from interface: Graph

Answer true iff the graph contains a triple matching (s, p, o). s/p/o may be concrete or fluid. Equivalent to find(s,p,o).hasNext, but an implementation is expected to optimise this in easy cases.

Specified by:

contains in interface Graph

Overrides:

contains in class WrappedGraph

find

public ExtendedIterator<Triple> find(Triple m)

Description copied from interface: Graph

Returns an iterator over all the Triples that match the triple pattern.

Specified by:

find in interface Graph

Overrides:

find in class WrappedGraph

Parameters:

m - a Triple encoding the pattern to look for

Returns:

an iterator of all triples in this graph that match m

find

public ExtendedIterator<Triple> find(Node subj,
 Node pred,
 Node obj)

Description copied from interface: Graph

Returns an iterator over Triples matching a pattern.

Specified by:

find in interface Graph

Overrides:

find in class WrappedGraph

Returns:

an iterator of triples in this graph matching the pattern.

toString

public String toString()

Overrides:

toString in class Object