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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.FOAF;
27 import org.apache.any23.vocab.XFN;
28 import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor;
29 import org.eclipse.rdf4j.model.BNode;
30 import org.eclipse.rdf4j.model.IRI;
31 import org.eclipse.rdf4j.model.impl.SimpleValueFactory;
32 import org.eclipse.rdf4j.model.vocabulary.RDF;
33 import org.w3c.dom.Document;
34 import org.w3c.dom.Node;
35
36 import java.io.IOException;
37 import java.util.Locale;
38
39
40
41
42
43
44 public class XFNExtractor implements TagSoupDOMExtractor {
45
46 private static final FOAF vFOAF = FOAF.getInstance();
47 private static final XFN vXFN = XFN.getInstance();
48
49 private final static Any23ValueFactoryWrapperAny23ValueFactoryWrapper">Any23ValueFactoryWrapper factoryWrapper = new Any23ValueFactoryWrapper(
50 SimpleValueFactory.getInstance());
51
52 private HTMLDocument document;
53 private ExtractionResult out;
54
55 @Override
56 public ExtractorDescription getDescription() {
57 return XFNExtractorFactory.getDescriptionInstance();
58 }
59
60 @Override
61 public void run(ExtractionParameters extractionParameters, ExtractionContext extractionContext, Document in,
62 ExtractionResult out) throws IOException, ExtractionException {
63 factoryWrapper.setIssueReport(out);
64 try {
65 document = new HTMLDocument(in);
66 this.out = out;
67
68 BNode subject = factoryWrapper.createBNode();
69 boolean foundAnyXFN = false;
70 final IRI documentIRI = extractionContext.getDocumentIRI();
71 for (Node link : document.findAll("//A[@rel][@href]")) {
72 foundAnyXFN |= extractLink(link, subject, documentIRI);
73 }
74 if (!foundAnyXFN)
75 return;
76 out.writeTriple(subject, RDF.TYPE, vFOAF.Person);
77 out.writeTriple(subject, vXFN.mePage, documentIRI);
78 } finally {
79 factoryWrapper.setIssueReport(null);
80 }
81 }
82
83 private boolean extractLink(Node firstLink, BNode subject, IRI documentIRI) throws ExtractionException {
84 String href = firstLink.getAttributes().getNamedItem("href").getNodeValue();
85 String rel = firstLink.getAttributes().getNamedItem("rel").getNodeValue();
86
87 String[] rels = rel.split("\\s+");
88 IRI link = document.resolveIRI(href);
89 if (containsRelMe(rels)) {
90 if (containsXFNRelExceptMe(rels)) {
91 return false;
92 }
93 out.writeTriple(subject, vXFN.mePage, link);
94 out.writeTriple(documentIRI, vXFN.getExtendedProperty("me"), link);
95 } else {
96 BNode person2 = factoryWrapper.createBNode();
97 boolean foundAnyXFNRel = false;
98 for (String aRel : rels) {
99 foundAnyXFNRel |= extractRel(aRel, subject, documentIRI, person2, link);
100 }
101 if (!foundAnyXFNRel) {
102 return false;
103 }
104 out.writeTriple(person2, RDF.TYPE, vFOAF.Person);
105 out.writeTriple(person2, vXFN.mePage, link);
106 }
107 return true;
108 }
109
110 private boolean containsRelMe(String[] rels) {
111 for (String rel : rels) {
112 if ("me".equals(rel.toLowerCase(Locale.ROOT))) {
113 return true;
114 }
115 }
116 return false;
117 }
118
119 private boolean containsXFNRelExceptMe(String[] rels) {
120 for (String rel : rels) {
121 if (!"me".equals(rel.toLowerCase(Locale.ROOT)) && vXFN.isXFNLocalName(rel)) {
122 return true;
123 }
124 }
125 return false;
126 }
127
128 private boolean extractRel(String rel, BNode person1, IRI uri1, BNode person2, IRI uri2) {
129 IRI peopleProp = vXFN.getPropertyByLocalName(rel);
130 IRI hyperlinkProp = vXFN.getExtendedProperty(rel);
131 if (peopleProp == null) {
132 return false;
133 }
134 out.writeTriple(person1, peopleProp, person2);
135 out.writeTriple(uri1, hyperlinkProp, uri2);
136 return true;
137 }
138
139 }