| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.any23.extractor.html; |
| |
| import org.apache.any23.extractor.ExtractionContext; |
| import org.apache.any23.extractor.ExtractionException; |
| import org.apache.any23.extractor.ExtractionParameters; |
| import org.apache.any23.extractor.ExtractionResult; |
| import org.apache.any23.extractor.ExtractorDescription; |
| import org.apache.any23.vocab.XHTML; |
| import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor; |
| import org.eclipse.rdf4j.model.IRI; |
| import org.eclipse.rdf4j.model.ValueFactory; |
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| /** |
| * This {@link org.apache.any23.extractor.Extractor.TagSoupDOMExtractor} implementation retrieves the <code>LINK</code>s |
| * declared within the <code>HTML/HEAD</code> page header. |
| */ |
| public class HeadLinkExtractor implements TagSoupDOMExtractor { |
| |
| public void run(ExtractionParameters extractionParameters, ExtractionContext extractionContext, Document in, |
| ExtractionResult out) throws IOException, ExtractionException { |
| HTMLDocument html = new HTMLDocument(in); |
| ValueFactory vf = SimpleValueFactory.getInstance(); |
| |
| final List<Node> headLinkNodes = DomUtils.findAll(in, |
| "/HTML/HEAD/LINK[(" + "@type='application/rdf+xml' or " + "@type='text/rdf' or " |
| + "@type='application/x-turtle' or " + "@type='application/turtle' or " |
| + "@type='text/turtle' or " + "@type='text/rdf+n3'" + ") and @href and @rel]"); |
| for (Node node : headLinkNodes) { |
| final IRI href = html.resolveIRI(DomUtils.find(node, "@href")); |
| final String rel = DomUtils.find(node, "@rel"); |
| out.writeTriple(extractionContext.getDocumentIRI(), vf.createIRI(XHTML.NS + rel), href); |
| final String title = DomUtils.find(node, "@title"); |
| if (title != null && !"".equals(title)) { |
| out.writeTriple(href, getDescription().getPrefixes().expand("dcterms:title"), vf.createLiteral(title)); |
| } |
| final String type = DomUtils.find(node, "@type"); |
| if (type != null && !"".equals(type)) { |
| out.writeTriple(href, getDescription().getPrefixes().expand("dcterms:format"), vf.createLiteral(type)); |
| } |
| } |
| } |
| |
| @Override |
| public ExtractorDescription getDescription() { |
| return HeadLinkExtractorFactory.getDescriptionInstance(); |
| } |
| |
| } |