1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.any23.extractor.rdf;
19
20 import org.apache.any23.extractor.ExtractionResult;
21 import org.eclipse.rdf4j.model.Resource;
22 import org.eclipse.rdf4j.model.Statement;
23 import org.eclipse.rdf4j.model.IRI;
24 import org.eclipse.rdf4j.rio.RDFHandler;
25 import org.eclipse.rdf4j.rio.RDFHandlerException;
26
27 /**
28 * An RDFHandler that relays statements and prefix definitions to an {@link ExtractionResult}. Used to feed output from
29 * Sesame's RDF parsers into Any23.
30 *
31 * @author Richard Cyganiak (richard@cyganiak.de)
32 */
33 public class RDFHandlerAdapter implements RDFHandler {
34
35 private ExtractionResult target;
36
37 public RDFHandlerAdapter(ExtractionResult target) {
38 this.target = target;
39 }
40
41 public void startRDF() throws RDFHandlerException {
42 }
43
44 public void handleNamespace(String prefix, String uri) {
45 target.writeNamespace(prefix, uri);
46 }
47
48 public void handleStatement(Statement stmt) {
49 if (stmt != null) {
50 final Resource context = stmt.getContext();
51 if (context instanceof IRI) {
52 target.writeTriple(stmt.getSubject(), stmt.getPredicate(), stmt.getObject(), (IRI) context);
53 } else {
54 target.writeTriple(stmt.getSubject(), stmt.getPredicate(), stmt.getObject());
55 }
56 }
57 }
58
59 public void handleComment(String comment) {
60 // Empty.
61 }
62
63 public void endRDF() throws RDFHandlerException {
64 // Empty.
65 }
66
67 }