| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.rya.api.resolver; |
| |
| import org.apache.rya.api.domain.RyaIRI; |
| import org.apache.rya.api.domain.RyaStatement; |
| import org.apache.rya.api.domain.RyaType; |
| import org.apache.rya.api.utils.LiteralLanguageUtils; |
| import org.eclipse.rdf4j.model.IRI; |
| import org.eclipse.rdf4j.model.Literal; |
| import org.eclipse.rdf4j.model.Statement; |
| import org.eclipse.rdf4j.model.Value; |
| import org.eclipse.rdf4j.model.ValueFactory; |
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; |
| import org.eclipse.rdf4j.model.util.Literals; |
| import org.eclipse.rdf4j.model.vocabulary.RDF; |
| import org.eclipse.rdf4j.model.vocabulary.XMLSchema; |
| |
| /** |
| * Methods for converting values from their Rya object representations into |
| * their RDF4J object equivalents. |
| */ |
| public class RyaToRdfConversions { |
| private static final ValueFactory VF = SimpleValueFactory.getInstance(); |
| |
| /** |
| * Converts a {@link RyaIRI} into a {@link IRI} representation of the |
| * {@code ryaIri}. |
| * @param ryaIri the {@link RyaIRI} to convert. |
| * @return the {@link IRI} representation of the {@code ryaIri}. |
| */ |
| public static IRI convertIRI(final RyaIRI ryaIri) { |
| return VF.createIRI(ryaIri.getData()); |
| } |
| |
| /** |
| * Converts a {@link RyaType} into a {@link IRI} representation of the |
| * {@code ryaType}. |
| * @param ryaType the {@link RyaType} to convert. |
| * @return the {@link IRI} representation of the {@code ryaType}. |
| */ |
| private static IRI convertIRI(final RyaType ryaType) { |
| return VF.createIRI(ryaType.getData()); |
| } |
| |
| /** |
| * Converts a {@link RyaType} into a {@link Literal} representation of the |
| * {@code ryaType}. |
| * @param ryaType the {@link RyaType} to convert. |
| * @return the {@link Literal} representation of the {@code ryaType}. |
| */ |
| public static Literal convertLiteral(final RyaType ryaType) { |
| if (XMLSchema.STRING.equals(ryaType.getDataType())) { |
| return VF.createLiteral(ryaType.getData()); |
| } else if (RDF.LANGSTRING.equals(ryaType.getDataType())) { |
| final String data = ryaType.getData(); |
| final String language = ryaType.getLanguage(); |
| if (language != null && Literals.isValidLanguageTag(language)) { |
| return VF.createLiteral(data, language); |
| } else { |
| return VF.createLiteral(data, LiteralLanguageUtils.UNDETERMINED_LANGUAGE); |
| } |
| } |
| return VF.createLiteral(ryaType.getData(), ryaType.getDataType()); |
| } |
| |
| /** |
| * Converts a {@link RyaType} into a {@link Value} representation of the |
| * {@code ryaType}. |
| * @param ryaType the {@link RyaType} to convert. |
| * @return the {@link Value} representation of the {@code ryaType}. |
| */ |
| public static Value convertValue(final RyaType ryaType) { |
| //assuming either IRI or Literal here |
| return (ryaType instanceof RyaIRI || ryaType.getDataType().equals(XMLSchema.ANYURI)) ? convertIRI(ryaType) : convertLiteral(ryaType); |
| } |
| |
| /** |
| * Converts a {@link RyaStatement} into a {@link Statement} representation |
| * of the {@code ryaStatement}. |
| * @param ryaStatement the {@link RyaStatement} to convert. |
| * @return the {@link Statement} representation of the {@code ryaStatement}. |
| */ |
| public static Statement convertStatement(final RyaStatement ryaStatement) { |
| assert ryaStatement != null; |
| if (ryaStatement.getContext() != null) { |
| return VF.createStatement(convertIRI(ryaStatement.getSubject()), |
| convertIRI(ryaStatement.getPredicate()), |
| convertValue(ryaStatement.getObject()), |
| convertIRI(ryaStatement.getContext())); |
| } else { |
| return VF.createStatement(convertIRI(ryaStatement.getSubject()), |
| convertIRI(ryaStatement.getPredicate()), |
| convertValue(ryaStatement.getObject())); |
| } |
| } |
| } |