Examples with GetStatementOptional org.eclipse.rdf4j.model.util.GetStatementOptional used on opensource projects

Example 1 with GetStatementOptional

use of org.eclipse.rdf4j.model.util.GetStatementOptional in project rdf4j by eclipse.

the class Connections method consumeRDFCollection.

/**
 * Retrieve all {@link Statement}s that together form the RDF Collection starting with the supplied start
 * resource and send them to the supplied {@link Consumer}.
 *
 * @param conn
 *        the {@link RepositoryConnection} to use for statement retrieval.
 * @param head
 *        the start resource of the RDF Collection. May not be {@code null}.
 * @param collectionConsumer
 *        a {@link Consumer} function to which all retrieved statements will be reported. May not be
 *        {@code null}.
 * @param 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 RDFCollections
 * @see <a href="http://www.w3.org/TR/rdf-schema/#ch_collectionvocab">RDF Schema 1.1 section on Collection
 *      vocabulary</a>.
 */
public static void consumeRDFCollection(RepositoryConnection conn, Resource head, Consumer<Statement> collectionConsumer, Resource... contexts) throws RepositoryException {
    GetStatementOptional statementSupplier = (s, p, o, c) -> getStatement(conn, s, p, o, c);
    Function<String, Supplier<RepositoryException>> exceptionSupplier = Repositories::repositoryException;
    RDFCollections.extract(statementSupplier, head, collectionConsumer, exceptionSupplier, contexts);
}