Package org.eclipse.rdf4j.model.util

Class Statements

java.lang.Object

org.eclipse.rdf4j.model.util.Statements

public class Statements
extends Object

Utility methods for working with Statement objects, including conversion to/from RDF-star triple objects.

Author:

Jeen Broekstra

Field Summary

Fields

Modifier and Type	Field	Description
static Function<Triple,Resource>	TRIPLE_BNODE_MAPPER	A Function that maps Triple to BNode consistently.

Constructor Summary

Constructors

Constructor	Description
Statements()

Method Summary

Modifier and Type	Method	Description
static void	consume(ValueFactory vf, Resource subject, IRI predicate, Value object, Consumer<Statement> consumer, Resource... contexts)	Creates one or more Statement objects with the given subject, predicate and object, one for each given context, and sends each created statement to the supplied Consumer.
static void	convertRDFStarToReification(Statement st, Consumer<Statement> consumer)	Converts the supplied RDF-star statement to RDF reification statements, and sends the resultant statements to the supplied consumer.
static void	convertRDFStarToReification(ValueFactory vf, Function<Triple,Resource> reifiedIdMapper, Statement st, Consumer<Statement> consumer)	Converts the supplied RDF-star statement to RDF reification statements, and sends the resultant statements to the supplied consumer.
static void	convertRDFStarToReification(ValueFactory vf, Statement st, Consumer<Statement> consumer)	Converts the supplied RDF-star statement to RDF reification statements, and sends the resultant statements to the supplied consumer.
static <C extends Collection<Statement>> C	create(ValueFactory vf, Resource subject, IRI predicate, Value object, C collection, Resource... contexts)	Creates one or more Statement objects with the given subject, predicate and object, one for each given context.
static boolean	isSameTriple(Statement st1, Statement st2)	Checks if the two statements represent the same triple (that is, they have equal subject, predicate, and object).
static Statement	statement(Resource subject, IRI predicate, Value object, Resource context)	Create a Statement from the supplied subject, predicate, object and context.
static Statement	statement(Triple triple)	Create a Statement from the supplied RDF-star triple
static Statement	statement(Triple triple, Resource context)	Create a Statement from the supplied RDF-star triple and context.
static Statement	statement(ValueFactory vf, Resource subject, IRI predicate, Value object, Resource context)	Create a Statement from the supplied subject, predicate, object and context.
static Statement	statement(ValueFactory vf, Triple triple, Resource context)	Create a Statement from the supplied RDF-star triple and context.
static Statement	stripContext(Statement statement)	Strips the context (if any) from the supplied statement and returns a statement with the same subject, predicate and object, but with no assigned context.
static Statement	stripContext(ValueFactory vf, Statement statement)	Strips the context (if any) from the supplied statement and returns a statement with the same subject, predicate and object, but with no assigned context.
static Statement	toStatement(Triple triple)	Deprecated. Use statement(Triple) instead
static Statement	toStatement(Triple triple, Resource context)	Deprecated. since 3.7.0 - use statement(Triple, Resource) instead
static Statement	toStatement(ValueFactory vf, Triple triple, Resource context)	Deprecated. Use statement(ValueFactory, Triple, Resource) instead
static Triple	toTriple(Statement statement)	Deprecated. Use Values.triple(Statement) instead
static Triple	toTriple(ValueFactory vf, Statement statement)	Deprecated. Use Values.triple(ValueFactory, Statement) instead

Methods inherited from class java.lang.Object

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

Field Details

TRIPLE_BNODE_MAPPER

@Experimental
public static Function<Triple,Resource> TRIPLE_BNODE_MAPPER

A Function that maps Triple to BNode consistently. Multiple invocations for the same Triple will return the same BNode.

The current implementation creates a BNode by encoding the string representation of the Triple using base64 URL-safe encoding.

Constructor Details

Statements

public Statements()

Method Details

consume

public static void consume(ValueFactory vf,
 Resource subject,
 IRI predicate,
 Value object,
 Consumer<Statement> consumer,
 Resource... contexts)

Creates one or more Statement objects with the given subject, predicate and object, one for each given context, and sends each created statement to the supplied Consumer. If no context is supplied, only a single statement (without any assigned context) is created.

Parameters:

vf - the ValueFactory to use for creating statements.

subject - the subject of each statement. May not be null.

predicate - the predicate of each statement. May not be null.

object - the object of each statement. May not be null.

consumer - the Consumer function for the produced statements.

contexts - the context(s) for which to produce statements. This argument is an optional vararg: leave it out completely to produce a single statement without context.

create

public static <C extends Collection<Statement>> C create(ValueFactory vf,
 Resource subject,
 IRI predicate,
 Value object,
 C collection,
 Resource... contexts)

Creates one or more Statement objects with the given subject, predicate and object, one for each given context. If no context is supplied, only a single statement (without any assigned context) is created.

Parameters:

vf - the ValueFactory to use for creating statements.

subject - the subject of each statement. May not be null.

predicate - the predicate of each statement. May not be null.

object - the object of each statement. May not be null.

collection - the collection of Statements to which the newly created Statements will be added. May not be null.

contexts - the context(s) for which to produce statements. This argument is an optional vararg: leave it out completely to produce a single statement without context.

Returns:

the input collection of Statements, with the newly created Statements added.

stripContext

public static Statement stripContext(Statement statement)

Strips the context (if any) from the supplied statement and returns a statement with the same subject, predicate and object, but with no assigned context.

Parameters:

statement - the statement to strip the context from

Returns:

a statement without context

Since:

3.1.0

stripContext

public static Statement stripContext(ValueFactory vf,
 Statement statement)

Strips the context (if any) from the supplied statement and returns a statement with the same subject, predicate and object, but with no assigned context.

Parameters:

vf - the ValueFactory to use for creating a new Statement.

statement - the statement to strip the context from.

Returns:

a statement without context

Since:

3.1.0

toTriple

@Deprecated(since="3.5.0")
public static Triple toTriple(Statement statement)

Deprecated.

Use Values.triple(Statement) instead

Create an RDF-star triple from the supplied Statement

Parameters:

statement - a statement to convert to an RDF-star triple

Returns:

an RDF-star triple with the same subject, predicate and object as the input statement.

Since:

3.4.0

toTriple

@Deprecated(since="3.5.0")
public static Triple toTriple(ValueFactory vf,
 Statement statement)

Deprecated.

Use Values.triple(ValueFactory, Statement) instead

Create an RDF-star triple from the supplied Statement

Parameters:

vf - the ValueFactory to use for creating the Triple object.

statement - a statement to convert to an RDF-star triple

Returns:

an RDF-star triple with the same subject, predicate and object as the input statement.

Since:

3.4.0

toStatement

public static Statement toStatement(Triple triple)

Deprecated.

Use statement(Triple) instead

Create a Statement from the supplied RDF-star triple

Parameters:

triple - an RDF-star triple to convert to a Statement.

Returns:

an Statement with the same subject, predicate and object as the input triple, and no context.

Since:

3.4.0

statement

public static Statement statement(Triple triple)

Create a Statement from the supplied RDF-star triple

Parameters:

triple - an RDF-star triple to convert to a Statement.

Returns:

an Statement with the same subject, predicate and object as the input triple, and no context.

Since:

3.4.0

statement

public static Statement statement(Triple triple,
 Resource context)

Create a Statement from the supplied RDF-star triple and context.

Parameters:

triple - an RDF-star triple to convert to a Statement.

context - the context to assign to the Statement.

Returns:

an Statement with the same subject, predicate and object as the input triple, and having the supplied context.

Since:

3.7.0

toStatement

public static Statement toStatement(Triple triple,
 Resource context)

Deprecated.

since 3.7.0 - use statement(Triple, Resource) instead

Create a Statement from the supplied RDF-star triple and context.

Parameters:

triple - an RDF-star triple to convert to a Statement.

context - the context to assign to the Statement.

Returns:

an Statement with the same subject, predicate and object as the input triple, and having the supplied context.

Since:

3.4.0

toStatement

public static Statement toStatement(ValueFactory vf,
 Triple triple,
 Resource context)

Deprecated.

Use statement(ValueFactory, Triple, Resource) instead

Create a Statement from the supplied RDF-star triple and context.

Parameters:

vf - the ValueFactory to use for creating the Statement object.

triple - an RDF-star triple to convert to a Statement.

context - the context to assign to the Statement. May be null to indicate no context.

Returns:

an Statement with the same subject, predicate and object as the input triple, and having the supplied context.

Since:

3.4.0

statement

public static Statement statement(ValueFactory vf,
 Triple triple,
 Resource context)

Create a Statement from the supplied RDF-star triple and context.

Parameters:

vf - the ValueFactory to use for creating the Statement object.

triple - an RDF-star triple to convert to a Statement.

context - the context to assign to the Statement. May be null to indicate no context.

Returns:

an Statement with the same subject, predicate and object as the input triple, and having the supplied context.

Since:

3.7.0

statement

public static Statement statement(Resource subject,
 IRI predicate,
 Value object,
 Resource context)

Create a Statement from the supplied subject, predicate, object and context.

Parameters:

subject - the statement subject

predicate - the statement predicate

object - the statement object

context - the context to assign to the Statement. May be null to indicate no context.

Returns:

an Statement with the same subject, predicate and object as the input triple, and having the supplied context.

Throws:

NullPointerException - if any of subject, predicate, or object are null.

Since:

3.5.0

statement

public static Statement statement(ValueFactory vf,
 Resource subject,
 IRI predicate,
 Value object,
 Resource context)

Create a Statement from the supplied subject, predicate, object and context.

Parameters:

vf - the ValueFactory to use for creating the Statement object.

subject - the statement subject

predicate - the statement predicate

object - the statement object

context - the context to assign to the Statement. May be null to indicate no context.

Returns:

an Statement with the same subject, predicate and object as the input triple, and having the supplied context.

Throws:

NullPointerException - if any of vf, subject, predicate, or object are null.

Since:

3.5.0

isSameTriple

public static boolean isSameTriple(Statement st1,
 Statement st2)

Checks if the two statements represent the same triple (that is, they have equal subject, predicate, and object). Context information is disregarded.

Parameters:

st1 - the first statement to compare. May not be null.

st2 - the second statement to compare. May not be null.

Returns:

true iff the subject, predicate and object of st1 and st2 are equal, false otherwise.

Since:

2.0

See Also:

• Statement.equals(Object)

convertRDFStarToReification

@Experimental
public static void convertRDFStarToReification(Statement st,
 Consumer<Statement> consumer)

Converts the supplied RDF-star statement to RDF reification statements, and sends the resultant statements to the supplied consumer. If the supplied statement is not RDF-star it will be sent to the consumer as is.

The statements needed to represent reification will use blank nodes.

Parameters:

st - the Statement to convert.

consumer - the Consumer function for the produced statements.

convertRDFStarToReification

@Experimental
public static void convertRDFStarToReification(ValueFactory vf,
 Statement st,
 Consumer<Statement> consumer)

Converts the supplied RDF-star statement to RDF reification statements, and sends the resultant statements to the supplied consumer. If the supplied statement is not RDF-star it will be sent to the consumer as is.

The statements needed to represent reification will use blank nodes.

The supplied value factory is used to create all new statements and blank nodes.

Parameters:

vf - the ValueFactory to use for creating statements.

st - the Statement to convert.

consumer - the Consumer function for the produced statements.

convertRDFStarToReification

@Experimental
public static void convertRDFStarToReification(ValueFactory vf,
 Function<Triple,Resource> reifiedIdMapper,
 Statement st,
 Consumer<Statement> consumer)

Converts the supplied RDF-star statement to RDF reification statements, and sends the resultant statements to the supplied consumer. If the supplied statement is not RDF-star it will be sent to the consumer as is.

The supplied value factory is used to create all new statements.

The supplied mapper function maps a Triple to a Resource and is used to create the ID of the RDF reification statement corresponding to the converted triple. The function must return the same value for identical triples in order to produce consistent results between invocations. See TRIPLE_BNODE_MAPPER.

Parameters:

vf - the ValueFactory to use for creating statements.

reifiedIdMapper - the mapper Function from Triple to Resource.

st - the Statement to convert,

consumer - the Consumer function for the produced statements.