/*

  * 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.extractor.ExtractorFactory;

 import org.apache.any23.extractor.SimpleExtractorFactory;

 import org.apache.any23.rdf.Any23ValueFactoryWrapper;

 import org.apache.any23.rdf.PopularPrefixes;

 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;

 import java.util.Arrays;

 /**

  * Extracts the value of the <title> element of an

  * HTML or XHTML page.

  *

  * @author Richard Cyganiak (richard@cyganiak.de)

  */

 public class TitleExtractor implements TagSoupDOMExtractor {

     public static final String NAME = "html-head-title";

     private static final DCTERMS vDCTERMS = DCTERMS.getInstance();

     public final static ExtractorFactory<TitleExtractor> factory =

             SimpleExtractorFactory.create(

                     NAME,

                     PopularPrefixes.createSubset("dcterms"),

                     Arrays.asList("text/html;q=0.02", "application/xhtml+xml;q=0.02"),

                     "example-title.html",

                     TitleExtractor.class

             );

     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.setErrorReporter(null);

         }

     }

     public ExtractorDescription getDescription() {

         return factory;

     }

 }