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package org.apache.any23.extractor.html; |
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import org.apache.any23.extractor.ExtractionContext; |
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import org.apache.any23.extractor.ExtractionException; |
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import org.apache.any23.extractor.ExtractionParameters; |
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import org.apache.any23.extractor.ExtractionResult; |
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import org.apache.any23.extractor.ExtractorDescription; |
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import org.apache.any23.extractor.ExtractorFactory; |
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import org.apache.any23.extractor.SimpleExtractorFactory; |
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import org.apache.any23.rdf.Any23ValueFactoryWrapper; |
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import org.apache.any23.rdf.PopularPrefixes; |
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import org.apache.any23.vocab.FOAF; |
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import org.apache.any23.vocab.XFN; |
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import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor; |
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import org.openrdf.model.BNode; |
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import org.openrdf.model.URI; |
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import org.openrdf.model.impl.ValueFactoryImpl; |
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import org.openrdf.model.vocabulary.RDF; |
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import org.w3c.dom.Document; |
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import org.w3c.dom.Node; |
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import java.io.IOException; |
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import java.util.Arrays; |
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|
48 | 0 | public class XFNExtractor implements TagSoupDOMExtractor { |
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|
50 | 0 | private static final FOAF vFOAF = FOAF.getInstance(); |
51 | 0 | private static final XFN vXFN = XFN.getInstance(); |
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|
53 | 0 | private final static Any23ValueFactoryWrapper factoryWrapper = |
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new Any23ValueFactoryWrapper(ValueFactoryImpl.getInstance()); |
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|
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private HTMLDocument document; |
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private ExtractionResult out; |
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|
59 | 0 | public final static ExtractorFactory<XFNExtractor> factory = |
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SimpleExtractorFactory.create( |
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"html-mf-xfn", |
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PopularPrefixes.createSubset("rdf", "foaf", "xfn"), |
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Arrays.asList("text/html;q=0.1", "application/xhtml+xml;q=0.1"), |
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"example-mf-xfn.html", |
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XFNExtractor.class |
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); |
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|
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public ExtractorDescription getDescription() { |
69 | 0 | return factory; |
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} |
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|
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public void run( |
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ExtractionParameters extractionParameters, |
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ExtractionContext extractionContext, |
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Document in, |
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ExtractionResult out |
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) throws IOException, ExtractionException { |
78 | 0 | factoryWrapper.setErrorReporter(out); |
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try { |
80 | 0 | document = new HTMLDocument(in); |
81 | 0 | this.out = out; |
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|
83 | 0 | BNode subject = factoryWrapper.createBNode(); |
84 | 0 | boolean foundAnyXFN = false; |
85 | 0 | final URI documentURI = extractionContext.getDocumentURI(); |
86 | 0 | for (Node link : document.findAll("//A[@rel][@href]")) { |
87 | 0 | foundAnyXFN |= extractLink(link, subject, documentURI); |
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} |
89 | 0 | if (!foundAnyXFN) return; |
90 | 0 | out.writeTriple(subject, RDF.TYPE, vFOAF.Person); |
91 | 0 | out.writeTriple(subject, vXFN.mePage, documentURI); |
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} finally { |
93 | 0 | factoryWrapper.setErrorReporter(null); |
94 | 0 | } |
95 | 0 | } |
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|
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private boolean extractLink(Node firstLink, BNode subject, URI documentURI) |
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throws ExtractionException { |
99 | 0 | String href = firstLink.getAttributes().getNamedItem("href").getNodeValue(); |
100 | 0 | String rel = firstLink.getAttributes().getNamedItem("rel").getNodeValue(); |
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|
102 | 0 | String[] rels = rel.split("\\s+"); |
103 | 0 | URI link = document.resolveURI(href); |
104 | 0 | if (containsRelMe(rels)) { |
105 | 0 | if (containsXFNRelExceptMe(rels)) { |
106 | 0 | return false; |
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} |
108 | 0 | out.writeTriple(subject, vXFN.mePage, link); |
109 | 0 | out.writeTriple(documentURI, vXFN.getExtendedProperty("me"), link); |
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} else { |
111 | 0 | BNode person2 = factoryWrapper.createBNode(); |
112 | 0 | boolean foundAnyXFNRel = false; |
113 | 0 | for (String aRel : rels) { |
114 | 0 | foundAnyXFNRel |= extractRel(aRel, subject, documentURI, person2, link); |
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} |
116 | 0 | if (!foundAnyXFNRel) { |
117 | 0 | return false; |
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} |
119 | 0 | out.writeTriple(person2, RDF.TYPE, vFOAF.Person); |
120 | 0 | out.writeTriple(person2, vXFN.mePage, link); |
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} |
122 | 0 | return true; |
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} |
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|
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private boolean containsRelMe(String[] rels) { |
126 | 0 | for (String rel : rels) { |
127 | 0 | if ("me".equals(rel.toLowerCase())) { |
128 | 0 | return true; |
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} |
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} |
131 | 0 | return false; |
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} |
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|
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private boolean containsXFNRelExceptMe(String[] rels) { |
135 | 0 | for (String rel : rels) { |
136 | 0 | if (!"me".equals(rel.toLowerCase()) && vXFN.isXFNLocalName(rel)) { |
137 | 0 | return true; |
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} |
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} |
140 | 0 | return false; |
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} |
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|
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private boolean extractRel(String rel, BNode person1, URI uri1, BNode person2, URI uri2) { |
144 | 0 | URI peopleProp = vXFN.getPropertyByLocalName(rel); |
145 | 0 | URI hyperlinkProp = vXFN.getExtendedProperty(rel); |
146 | 0 | if (peopleProp == null) { |
147 | 0 | return false; |
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} |
149 | 0 | out.writeTriple(person1, peopleProp, person2); |
150 | 0 | out.writeTriple(uri1, hyperlinkProp, uri2); |
151 | 0 | return true; |
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} |
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|
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} |