001package ca.uhn.fhir.util.rdf;
002
003/*
004 * #%L
005 * HAPI FHIR - Core Library
006 * %%
007 * Copyright (C) 2014 - 2019 University Health Network
008 * %%
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 *
013 *      http://www.apache.org/licenses/LICENSE-2.0
014 *
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 * #L%
021 */
022
023import org.apache.commons.io.input.ReaderInputStream;
024import org.apache.commons.io.output.WriterOutputStream;
025import org.apache.jena.graph.Triple;
026import org.apache.jena.rdf.model.Model;
027import org.apache.jena.rdf.model.ModelFactory;
028import org.apache.jena.riot.Lang;
029import org.apache.jena.riot.system.StreamRDF;
030import org.apache.jena.riot.system.StreamRDFWriter;
031
032import java.io.*;
033import java.nio.charset.Charset;
034import java.util.*;
035
036public class RDFUtil {
037        private static final org.slf4j.Logger ourLog = org.slf4j.LoggerFactory.getLogger(RDFUtil.class);
038        private static final Map<String, Integer> VALID_ENTITY_NAMES;
039
040        static {
041                HashMap<String, Integer> validEntityNames = new HashMap<>(1448);
042                VALID_ENTITY_NAMES = Collections.unmodifiableMap(validEntityNames);
043        }
044
045        public static StreamRDF createRDFWriter(final Writer writer, final Lang lang) {
046                WriterOutputStream wos = new WriterOutputStream(writer, Charset.defaultCharset());
047                return StreamRDFWriter.getWriterStream(wos, lang);
048        }
049
050        public static StreamRDF createRDFReader(final Reader reader, final Lang lang) {
051                ReaderInputStream ris = new ReaderInputStream(reader, Charset.defaultCharset());
052                return StreamRDFWriter.getWriterStream(null, lang);
053        }
054
055        public static Triple triple(String tripleAsTurtle) {
056                Model m = ModelFactory.createDefaultModel();
057                m.read(new StringReader(tripleAsTurtle), "urn:x-base:", "TURTLE");
058                return m.listStatements().next().asTriple();
059        }
060
061}