| /* |
| * 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 static org.apache.rya.api.utils.LiteralLanguageUtils.UNDETERMINED_LANGUAGE; |
| |
| import org.apache.log4j.Logger; |
| import org.apache.rya.api.domain.RangeIRI; |
| import org.apache.rya.api.domain.RangeValue; |
| import org.apache.rya.api.domain.RyaIRI; |
| import org.apache.rya.api.domain.RyaIRIRange; |
| import org.apache.rya.api.domain.RyaSchema; |
| import org.apache.rya.api.domain.RyaStatement; |
| import org.apache.rya.api.domain.RyaType; |
| import org.apache.rya.api.domain.RyaTypeRange; |
| import org.apache.rya.api.log.LogUtils; |
| import org.eclipse.rdf4j.model.BNode; |
| import org.eclipse.rdf4j.model.IRI; |
| import org.eclipse.rdf4j.model.Literal; |
| import org.eclipse.rdf4j.model.Resource; |
| import org.eclipse.rdf4j.model.Statement; |
| import org.eclipse.rdf4j.model.Value; |
| import org.eclipse.rdf4j.model.util.Literals; |
| |
| /** |
| * Methods for converting values from their RDF4J object representations into |
| * their Rya object equivalents. |
| */ |
| public class RdfToRyaConversions { |
| private static final Logger log = Logger.getLogger(RdfToRyaConversions.class); |
| |
| /** |
| * Converts a {@link IRI} into a {@link RyaIRI} representation of the |
| * {@code iri}. |
| * @param iri the {@link IRI} to convert. |
| * @return the {@link RyaIRI} representation of the {@code iri}. |
| */ |
| public static RyaIRI convertIRI(final IRI iri) { |
| if (iri == null) { |
| return null; |
| } |
| if (iri instanceof RangeIRI) { |
| final RangeIRI riri = (RangeIRI) iri; |
| return new RyaIRIRange(convertIRI(riri.getStart()), convertIRI(riri.getEnd())); |
| } |
| return new RyaIRI(iri.stringValue()); |
| } |
| |
| /** |
| * Converts a {@link Literal} into a {@link RyaType} representation of the |
| * {@code literal}. |
| * @param literal the {@link Literal} to convert. |
| * @return the {@link RyaType} representation of the {@code literal}. |
| */ |
| public static RyaType convertLiteral(final Literal literal) { |
| if (literal == null) { |
| return null; |
| } |
| if (literal.getDatatype() != null) { |
| if (Literals.isLanguageLiteral(literal)) { |
| final String language = literal.getLanguage().get(); |
| if (Literals.isValidLanguageTag(language)) { |
| return new RyaType(literal.getDatatype(), literal.stringValue(), language); |
| } else { |
| log.warn("Invalid language (" + LogUtils.clean(language) + ") found in Literal. Defaulting to: " + UNDETERMINED_LANGUAGE); |
| // Replace invalid language with "und" |
| return new RyaType(literal.getDatatype(), literal.stringValue(), UNDETERMINED_LANGUAGE); |
| } |
| } |
| return new RyaType(literal.getDatatype(), literal.stringValue()); |
| } |
| return new RyaType(literal.stringValue()); |
| } |
| |
| /** |
| * Converts a {@link Value} into a {@link RyaType} representation of the |
| * {@code value}. |
| * @param value the {@link Value} to convert. |
| * @return the {@link RyaType} representation of the {@code value}. |
| */ |
| public static RyaType convertValue(final Value value) { |
| if (value == null) { |
| return null; |
| } |
| //assuming either IRI or Literal here |
| if (value instanceof Resource) { |
| return convertResource((Resource) value); |
| } |
| if (value instanceof Literal) { |
| return convertLiteral((Literal) value); |
| } |
| if (value instanceof RangeValue) { |
| final RangeValue<?> rv = (RangeValue<?>) value; |
| if (rv.getStart() instanceof IRI) { |
| return new RyaIRIRange(convertIRI((IRI) rv.getStart()), convertIRI((IRI) rv.getEnd())); |
| } else { |
| //literal |
| return new RyaTypeRange(convertLiteral((Literal) rv.getStart()), convertLiteral((Literal) rv.getEnd())); |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Converts a {@link Resource} into a {@link RyaIRI} representation of the |
| * {@code resource}. |
| * @param resource the {@link Resource} to convert. Generally this will be |
| * the subject. |
| * @return the {@link RyaIRI} representation of the {@code resource}. |
| */ |
| public static RyaIRI convertResource(final Resource resource) { |
| if (resource == null) { |
| return null; |
| } |
| if (resource instanceof BNode) { |
| return new RyaIRI(RyaSchema.BNODE_NAMESPACE + ((BNode) resource).getID()); |
| } |
| return convertIRI((IRI) resource); |
| } |
| |
| /** |
| * Converts a {@link Statement} into a {@link RyaStatement} representation |
| * of the {@code statement}. |
| * @param statement the {@link Statement} to convert. |
| * @return the {@link RyaStatement} representation of the {@code statement}. |
| */ |
| public static RyaStatement convertStatement(final Statement statement) { |
| if (statement == null) { |
| return null; |
| } |
| final Resource subject = statement.getSubject(); |
| final IRI predicate = statement.getPredicate(); |
| final Value object = statement.getObject(); |
| final Resource context = statement.getContext(); |
| return new RyaStatement( |
| convertResource(subject), |
| convertIRI(predicate), |
| convertValue(object), |
| convertResource(context)); |
| } |
| } |