Package org.apache.commons.rdf.simple

Class GraphImpl

java.lang.Object

org.apache.commons.rdf.simple.GraphImpl

All Implemented Interfaces:

java.lang.AutoCloseable, Graph, GraphLike<Triple>

final class GraphImpl
extends java.lang.Object
implements Graph

A simple, memory-based implementation of Graph.

Triples in the graph are kept in a Set.

All Stream operations are performed using parallel and unordered directives.

Field Summary

Fields

Modifier and Type	Field	Description
private SimpleRDF	factory
private static int	TO_STRING_MAX
private java.util.Set<Triple>	triples

Constructor Summary

Constructors

Constructor	Description
GraphImpl(SimpleRDF simpleRDF)

Method Summary

Modifier and Type	Method	Description
void	add(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)	Adds a triple to the graph, possibly mapping any of the components to those supported by this Graph.
void	add(Triple triple)	Adds a triple to the graph, possibly mapping any of the components of the Triple to those supported by this Graph.
void	clear()	Clears the graph, removing all triples.
boolean	contains(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)	Checks if graph contains a pattern of triples.
boolean	contains(Triple triple)	Checks if graph contains triple.
private java.util.stream.Stream<Triple>	getTriples(java.util.function.Predicate<Triple> filter)
private Triple	internallyMap(Triple triple)
private <T extends RDFTerm> RDFTerm	internallyMap(T object)
void	remove(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)	Removes a concrete pattern of triples from the graph.
void	remove(Triple triple)	Removes a concrete triple from the graph.
long	size()	Number of triples contained by the graph.
java.util.stream.Stream<Triple>	stream()	Gets all triples contained by the graph.
java.util.stream.Stream<Triple>	stream(BlankNodeOrIRI subject, IRI predicate, RDFTerm object)	Gets all triples contained by the graph matched with the pattern.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.commons.rdf.api.Graph

close, getTriples, getTriples, iterate, iterate

Field Detail

TO_STRING_MAX

private static final int TO_STRING_MAX

See Also:

Constant Field Values

triples

private final java.util.Set<Triple> triples

factory

private final SimpleRDF factory

Constructor Detail

GraphImpl

GraphImpl(SimpleRDF simpleRDF)

Method Detail

add

public void add(BlankNodeOrIRI subject,
                IRI predicate,
                RDFTerm object)

Description copied from interface: Graph

Adds a triple to the graph, possibly mapping any of the components to those supported by this Graph.

Specified by:

add in interface Graph

Parameters:

subject - The triple subject

predicate - The triple predicate

object - The triple object

add

public void add(Triple triple)

Description copied from interface: Graph

Adds a triple to the graph, possibly mapping any of the components of the Triple to those supported by this Graph.

Specified by:

add in interface Graph

Specified by:

add in interface GraphLike<Triple>

Parameters:

triple - The triple to add

internallyMap

private <T extends RDFTerm> RDFTerm internallyMap(T object)

internallyMap

private Triple internallyMap(Triple triple)

clear

public void clear()

Description copied from interface: Graph

Clears the graph, removing all triples.

Specified by:

clear in interface Graph

Specified by:

clear in interface GraphLike<Triple>

contains

public boolean contains(BlankNodeOrIRI subject,
                        IRI predicate,
                        RDFTerm object)

Description copied from interface: Graph

Checks if graph contains a pattern of triples.

Specified by:

contains in interface Graph

Parameters:

subject - The triple subject (null is a wildcard)

predicate - The triple predicate (null is a wildcard)

object - The triple object (null is a wildcard)

Returns:

True if the Graph contains any Triples that match the given pattern.

contains

public boolean contains(Triple triple)

Description copied from interface: Graph

Checks if graph contains triple.

Specified by:

contains in interface Graph

Specified by:

contains in interface GraphLike<Triple>

Parameters:

triple - The triple to check.

Returns:

True if the Graph contains the given Triple.

stream

public java.util.stream.Stream<Triple> stream()

Description copied from interface: Graph

Gets all triples contained by the graph.

The iteration does not contain any duplicate triples, as determined by the Triple.equals(Object) method for each Triple.

The behaviour of the Stream is not specified if Graph.add(Triple), Graph.remove(Triple) or Graph.clear() are called on the Graph before it terminates.

Implementations may throw ConcurrentModificationException from Stream methods if they detect a conflict while the Stream is active.

Specified by:

stream in interface Graph

Specified by:

stream in interface GraphLike<Triple>

Returns:

A Stream over all of the triples in the graph

stream

public java.util.stream.Stream<Triple> stream(BlankNodeOrIRI subject,
                                              IRI predicate,
                                              RDFTerm object)

Description copied from interface: Graph

Gets all triples contained by the graph matched with the pattern.

The iteration does not contain any duplicate triples, as determined by the Triple.equals(Object) method for each Triple.

The behaviour of the Stream is not specified if Graph.add(Triple), Graph.remove(Triple) or Graph.clear() are called on the Graph before it terminates.

Implementations may throw ConcurrentModificationException from Stream methods if they detect a conflict while the Stream is active.

Specified by:

stream in interface Graph

Parameters:

subject - The triple subject (null is a wildcard)

predicate - The triple predicate (null is a wildcard)

object - The triple object (null is a wildcard)

Returns:

A Stream over the matched triples.

getTriples

private java.util.stream.Stream<Triple> getTriples(java.util.function.Predicate<Triple> filter)

remove

public void remove(BlankNodeOrIRI subject,
                   IRI predicate,
                   RDFTerm object)

Description copied from interface: Graph

Removes a concrete pattern of triples from the graph.

Specified by:

remove in interface Graph

Parameters:

subject - The triple subject (null is a wildcard)

predicate - The triple predicate (null is a wildcard)

object - The triple object (null is a wildcard)

remove

public void remove(Triple triple)

Description copied from interface: Graph

Removes a concrete triple from the graph.

Specified by:

remove in interface Graph

Specified by:

remove in interface GraphLike<Triple>

Parameters:

triple - triple to remove

size

public long size()

Description copied from interface: Graph

Number of triples contained by the graph.

The count of a set does not include duplicates, consistent with the Triple.equals(Object) equals method for each Triple.

Specified by:

size in interface Graph

Specified by:

size in interface GraphLike<Triple>

Returns:

The number of triples in the graph

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object