| /* |
| * 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.rdf.Any23ValueFactoryWrapper; |
| import org.apache.any23.vocab.FOAF; |
| import org.apache.any23.vocab.XFN; |
| import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor; |
| import org.eclipse.rdf4j.model.BNode; |
| import org.eclipse.rdf4j.model.IRI; |
| import org.eclipse.rdf4j.model.impl.SimpleValueFactory; |
| import org.eclipse.rdf4j.model.vocabulary.RDF; |
| import org.w3c.dom.Document; |
| import org.w3c.dom.Node; |
| |
| import java.io.IOException; |
| import java.util.Locale; |
| |
| /** |
| * Extractor for the <a href="http://microformats.org/wiki/xfn">XFN</a> |
| * microformat. |
| * |
| * @author Richard Cyganiak (richard@cyganiak.de) |
| */ |
| public class XFNExtractor implements TagSoupDOMExtractor { |
| |
| private static final FOAF vFOAF = FOAF.getInstance(); |
| private static final XFN vXFN = XFN.getInstance(); |
| |
| private final static Any23ValueFactoryWrapper factoryWrapper = |
| new Any23ValueFactoryWrapper(SimpleValueFactory.getInstance()); |
| |
| private HTMLDocument document; |
| private ExtractionResult out; |
| |
| @Override |
| public ExtractorDescription getDescription() { |
| return XFNExtractorFactory.getDescriptionInstance(); |
| } |
| |
| @Override |
| public void run( |
| ExtractionParameters extractionParameters, |
| ExtractionContext extractionContext, |
| Document in, |
| ExtractionResult out |
| ) throws IOException, ExtractionException { |
| factoryWrapper.setIssueReport(out); |
| try { |
| document = new HTMLDocument(in); |
| this.out = out; |
| |
| BNode subject = factoryWrapper.createBNode(); |
| boolean foundAnyXFN = false; |
| final IRI documentIRI = extractionContext.getDocumentIRI(); |
| for (Node link : document.findAll("//A[@rel][@href]")) { |
| foundAnyXFN |= extractLink(link, subject, documentIRI); |
| } |
| if (!foundAnyXFN) return; |
| out.writeTriple(subject, RDF.TYPE, vFOAF.Person); |
| out.writeTriple(subject, vXFN.mePage, documentIRI); |
| } finally { |
| factoryWrapper.setIssueReport(null); |
| } |
| } |
| |
| private boolean extractLink(Node firstLink, BNode subject, IRI documentIRI) |
| throws ExtractionException { |
| String href = firstLink.getAttributes().getNamedItem("href").getNodeValue(); |
| String rel = firstLink.getAttributes().getNamedItem("rel").getNodeValue(); |
| |
| String[] rels = rel.split("\\s+"); |
| IRI link = document.resolveIRI(href); |
| if (containsRelMe(rels)) { |
| if (containsXFNRelExceptMe(rels)) { |
| return false; // "me" cannot be combined with any other XFN values |
| } |
| out.writeTriple(subject, vXFN.mePage, link); |
| out.writeTriple(documentIRI, vXFN.getExtendedProperty("me"), link); |
| } else { |
| BNode person2 = factoryWrapper.createBNode(); |
| boolean foundAnyXFNRel = false; |
| for (String aRel : rels) { |
| foundAnyXFNRel |= extractRel(aRel, subject, documentIRI, person2, link); |
| } |
| if (!foundAnyXFNRel) { |
| return false; |
| } |
| out.writeTriple(person2, RDF.TYPE, vFOAF.Person); |
| out.writeTriple(person2, vXFN.mePage, link); |
| } |
| return true; |
| } |
| |
| private boolean containsRelMe(String[] rels) { |
| for (String rel : rels) { |
| if ("me".equals(rel.toLowerCase(Locale.ROOT))) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean containsXFNRelExceptMe(String[] rels) { |
| for (String rel : rels) { |
| if (!"me".equals(rel.toLowerCase(Locale.ROOT)) && vXFN.isXFNLocalName(rel)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| private boolean extractRel(String rel, BNode person1, IRI uri1, BNode person2, IRI uri2) { |
| IRI peopleProp = vXFN.getPropertyByLocalName(rel); |
| IRI hyperlinkProp = vXFN.getExtendedProperty(rel); |
| if (peopleProp == null) { |
| return false; |
| } |
| out.writeTriple(person1, peopleProp, person2); |
| out.writeTriple(uri1, hyperlinkProp, uri2); |
| return true; |
| } |
| |
| } |