Class Connections
- java.lang.Object
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- org.eclipse.rdf4j.repository.util.Connections
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public class Connections extends Object
Convenience functions for use withRepositoryConnections.- Author:
- Jeen Broekstra
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Constructor Summary
Constructors Constructor Description Connections()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static voidconsumeRDFCollection(RepositoryConnection conn, Resource head, Consumer<Statement> collectionConsumer, Resource... contexts)static <C extends Collection<Statement>>
CgetRDFCollection(RepositoryConnection conn, Resource head, C statementCollection, Resource... contexts)Retrieve allStatements that together form the RDF Collection starting with the supplied starting resource.static Optional<Statement>getStatement(RepositoryConnection conn, Resource subject, IRI predicate, Value object, Resource... contexts)Retrieve a singleStatementmatching with the supplied subject, predicate, object and context(s) from the givenRepositoryConnection.
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Method Detail
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consumeRDFCollection
public static void consumeRDFCollection(RepositoryConnection conn, Resource head, Consumer<Statement> collectionConsumer, Resource... contexts) throws RepositoryException
Retrieve allStatements that together form the RDF Collection starting with the supplied start resource and send them to the suppliedConsumer.- Parameters:
conn- theRepositoryConnectionto use for statement retrieval.head- the start resource of the RDF Collection. May not benull.collectionConsumer- aConsumerfunction to which all retrieved statements will be reported. May not benull.contexts- the context(s) from which to read the RDF Collection. This argument is an optional vararg and can be left out.- Throws:
RepositoryException- if an error occurred while reading the collection statements, for example if a cycle is detected in the RDF collection, or some other anomaly which makes it non-wellformed.- See Also:
RDFCollections, RDF Schema 1.1 section on Collection vocabulary.
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getRDFCollection
public static <C extends Collection<Statement>> C getRDFCollection(RepositoryConnection conn, Resource head, C statementCollection, Resource... contexts) throws RepositoryException
Retrieve allStatements that together form the RDF Collection starting with the supplied starting resource.- Parameters:
conn- theRepositoryConnectionto use for statement retrieval.head- the start resource of the RDF Collection. May not benull.statementCollection- aCollectionofStatements (for example, aModel) to which all retrieved statements will be reported. May not benull.contexts- the context(s) from which to read the RDF Collection. This argument is an optional vararg and can be left out.- Returns:
- the input statement collection, with the statements forming the retrieved RDF Collection added.
- Throws:
RepositoryException- if an error occurred while reading the collection statements, for example if a cycle is detected in the RDF collection, or some other anomaly which makes it non-wellformed.- See Also:
RDFCollections, RDF Schema 1.1 section on Collection vocabulary.
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getStatement
public static Optional<Statement> getStatement(RepositoryConnection conn, Resource subject, IRI predicate, Value object, Resource... contexts) throws RepositoryException
Retrieve a singleStatementmatching with the supplied subject, predicate, object and context(s) from the givenRepositoryConnection. If more than one Statement matches, any one Statement is selected and returned.- Parameters:
conn- theRepositoryConnectionfrom which to retrieve the statement.subject- the subject to which the statement should match. May benull.predicate- the predicate to which the statement should match. May benull.object- the object to which the statement should match. May benull.contexts- the context(s) from which to read the Statement. This argument is an optional vararg and can be left out.- Returns:
- an
OptionalofStatement. If no matching Statement was found,Optional.empty()is returned. - Throws:
RepositoryException
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