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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   * @author Hans Brende (hansbrende@apache.org)
33   */
34  public class TurtleWriter extends RDFWriterTripleHandler {
35  
36      static class Internal {
37          // rdf4j-internal ArrangedWriter + -ea causes AssertionError
38          // when writing example output of html-mf-hlisting extractor!
39          // Override to return rdf4j TurtleWriter instances instead.
40          private static final org.eclipse.rdf4j.rio.turtle.TurtleWriterFactory rdf4j
41                  = 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              @Override
47              public RDFWriter getWriter(OutputStream out, String baseURI) throws URISyntaxException {
48                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(out, new ParsedIRI(baseURI));
49              }
50              @Override
51              public RDFWriter getWriter(Writer writer) {
52                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(writer);
53              }
54              @Override
55              public RDFWriter getWriter(Writer writer, String baseURI) throws URISyntaxException {
56                  return new org.eclipse.rdf4j.rio.turtle.TurtleWriter(writer, new ParsedIRI(baseURI));
57              }
58          };
59  
60          static final TripleFormat FORMAT = format(rdf4j);
61  
62          static final Settings SUPPORTED_SETTINGS = Settings.of(
63                  WriterSettings.PRETTY_PRINT
64          );
65      }
66  
67      @Override
68      void configure(WriterConfig config, Settings settings) {
69          config.set(BasicWriterSettings.PRETTY_PRINT, settings.get(WriterSettings.PRETTY_PRINT));
70      }
71  
72      /**
73       * Constructor.
74       *
75       * @param out stream to write on.
76       */
77      public TurtleWriter(OutputStream out) {
78          this(out, Settings.of());
79      }
80  
81      public TurtleWriter(OutputStream os, Settings settings) {
82          super(Internal.rdf4j, Internal.FORMAT, os, settings);
83      }
84  
85  }