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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.writer;
19  
20  import org.apache.any23.configuration.Settings;
21  import org.eclipse.rdf4j.common.net.ParsedIRI;
22  import org.eclipse.rdf4j.rio.RDFWriter;
23  import org.eclipse.rdf4j.rio.WriterConfig;
24  import org.eclipse.rdf4j.rio.helpers.BasicWriterSettings;
25  
26  import java.io.OutputStream;
27  import java.io.Writer;
28  import java.net.URISyntaxException;
29  
30  /**
31   * <i>N3</i> notation {@link TripleWriter} implementation.
32   * 
33   * @author Hans Brende (hansbrende@apache.org)
34   */
35  public class TurtleWriter extends RDFWriterTripleHandler {
36  
37      static class Internal {
38          // rdf4j-internal ArrangedWriter + -ea causes AssertionError
39          // when writing example output of html-mf-hlisting extractor!
40          // Override to return rdf4j TurtleWriter instances instead.
41          private static final org.eclipse.rdf4j.rio.turtle.TurtleWriterFactory rdf4j = new org.eclipse.rdf4j.rio.turtle.TurtleWriterFactory() {
42              @Override
43              public RDFWriter getWriter(OutputStream out) {
44                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(out);
45              }
46  
47              @Override
48              public RDFWriter getWriter(OutputStream out, String baseURI) throws URISyntaxException {
49                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(out, new ParsedIRI(baseURI));
50              }
51  
52              @Override
53              public RDFWriter getWriter(Writer writer) {
54                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(writer);
55              }
56  
57              @Override
58              public RDFWriter getWriter(Writer writer, String baseURI) throws URISyntaxException {
59                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(writer, new ParsedIRI(baseURI));
60              }
61          };
62  
63          static final TripleFormat FORMAT = format(rdf4j);
64  
65          static final Settings SUPPORTED_SETTINGS = Settings.of(WriterSettings.PRETTY_PRINT);
66      }
67  
68      @Override
69      void configure(WriterConfig config, Settings settings) {
70          config.set(BasicWriterSettings.PRETTY_PRINT, settings.get(WriterSettings.PRETTY_PRINT));
71      }
72  
73      /**
74       * Constructor.
75       *
76       * @param out
77       *            stream to write on.
78       */
79      public TurtleWriter(OutputStream out) {
80          this(out, Settings.of());
81      }
82  
83      public TurtleWriter(OutputStream os, Settings settings) {
84          super(Internal.rdf4j, Internal.FORMAT, os, settings);
85      }
86  
87  }