/*
* 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.DCTerms;
import org.apache.any23.extractor.Extractor.TagSoupDOMExtractor;
import org.openrdf.model.impl.ValueFactoryImpl;
import org.w3c.dom.Document;
import java.io.IOException;
/**
* Extracts the value of the <title> element of an
* HTML or XHTML page.
*
* @author Richard Cyganiak (richard@cyganiak.de)
*/
public class TitleExtractor implements TagSoupDOMExtractor {
private static final DCTerms vDCTERMS = DCTerms.getInstance();
@Override
public void run(
ExtractionParameters extractionParameters,
ExtractionContext extractionContext,
Document in,
ExtractionResult out
) throws IOException, ExtractionException {
final Any23ValueFactoryWrapper valueFactory = new Any23ValueFactoryWrapper(
ValueFactoryImpl.getInstance(), out, extractionContext.getDefaultLanguage()
);
try {
String title = DomUtils.find(in, "/HTML/HEAD/TITLE/text()").trim();
if (title != null && (title.length() != 0)) {
out.writeTriple(extractionContext.getDocumentURI(), vDCTERMS.title, valueFactory.createLiteral(title));
}
} finally {
valueFactory.setIssueReport(null);
}
}
@Override
public ExtractorDescription getDescription() {
return TitleExtractorFactory.getDescriptionInstance();
}
}