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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.extractor.IssueReport;
    26  import org.apache.any23.vocab.XHTML;
    27  import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor;
    28  import org.eclipse.rdf4j.model.IRI;
    29  import org.w3c.dom.Document;
    30  import org.w3c.dom.Node;
    31
    32  import java.io.IOException;
    33  import java.util.Locale;
    34
    35  /**
    36   * Extractor for the <a href="http://microformats.org/wiki/rel-license">rel-license</a> microformat.
    37   *
    38   * @author Gabriele Renzi
    39   * @author Richard Cyganiak
    40   */
    41  public class LicenseExtractor implements TagSoupDOMExtractor {
    42
    43      private static final XHTML vXHTML = XHTML.getInstance();
    44
    45      @Override
    46      public void run(ExtractionParameters extractionParameters, ExtractionContext extractionContext, Document in,
    47              ExtractionResult out) throws IOException, ExtractionException {
    48          HTMLDocumentTMLDocument.html#HTMLDocument">HTMLDocument document = new HTMLDocument(in);
    49          final IRI documentIRI = extractionContext.getDocumentIRI();
    50          for (Node node : DomUtils.findAll(in, "//A[@rel='license']/@href")) {
    51              String link = node.getNodeValue();
    52              if ("".equals(link)) {
    53                  out.notifyIssue(IssueReport.IssueLevel.WARNING, String.format(Locale.ROOT,
    54                          "Invalid license link detected within document %s.", documentIRI.toString()), 0, 0);
    55                  continue;
    56              }
    57              out.writeTriple(documentIRI, vXHTML.license, document.resolveIRI(link));
    58          }
    59      }
    60
    61      @Override
    62      public ExtractorDescription getDescription() {
    63          return LicenseExtractorFactory.getDescriptionInstance();
    64      }
    65
    66  }