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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.extractor.html;
    19
    20  import org.apache.any23.extractor.ExtractionContext;
    21  import org.apache.any23.extractor.ExtractionException;
    22  import org.apache.any23.extractor.ExtractionParameters;
    23  import org.apache.any23.extractor.ExtractionResult;
    24  import org.apache.any23.extractor.ExtractorDescription;
    25  import org.apache.any23.rdf.Any23ValueFactoryWrapper;
    26  import org.apache.any23.vocab.DCTerms;
    27  import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor;
    28  import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
    29  import org.w3c.dom.Document;
    30
    31  import java.io.IOException;
    32
    33  /**
    34   * Extracts the value of the &lt;title&gt; element of an HTML or XHTML page.
    35   *
    36   * @author Richard Cyganiak (richard@cyganiak.de)
    37   */
    38  public class TitleExtractor implements TagSoupDOMExtractor {
    39
    40      private static final DCTerms vDCTERMS = DCTerms.getInstance();
    41
    42      @Override
    43      public void run(ExtractionParameters extractionParameters, ExtractionContext extractionContext, Document in,
    44              ExtractionResult out) throws IOException, ExtractionException {
    45          final Any23ValueFactoryWrapperl#Any23ValueFactoryWrapper">Any23ValueFactoryWrapper valueFactory = new Any23ValueFactoryWrapper(SimpleValueFactory.getInstance(),
    46                  out, extractionContext.getDefaultLanguage());
    47
    48          try {
    49              String title = DomUtils.find(in, "/HTML/HEAD/TITLE/text()").trim();
    50              if (title != null && (title.length() != 0)) {
    51                  out.writeTriple(extractionContext.getDocumentIRI(), vDCTERMS.title, valueFactory.createLiteral(title));
    52              }
    53          } finally {
    54              valueFactory.setIssueReport(null);
    55          }
    56      }
    57
    58      @Override
    59      public ExtractorDescription getDescription() {
    60          return TitleExtractorFactory.getDescriptionInstance();
    61      }
    62
    63  }