/*

  * 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.ExtractionResult;

 import org.apache.any23.extractor.ExtractorDescription;

 import org.apache.any23.extractor.ExtractorFactory;

 import org.apache.any23.extractor.SimpleExtractorFactory;

 import org.apache.any23.extractor.TagSoupExtractionResult;

 import org.apache.any23.rdf.PopularPrefixes;

 import org.apache.any23.vocab.VCARD;

 import org.openrdf.model.BNode;

 import org.openrdf.model.vocabulary.RDF;

 import org.w3c.dom.Node;

 import java.util.Arrays;

 /**

  * Extractor for the <a href="http://microformats.org/wiki/geo">Geo</a>

  * microformat.

  *

  * @author Gabriele Renzi

  */

 public class GeoExtractor extends EntityBasedMicroformatExtractor {

     private static final VCARD vVCARD = VCARD.getInstance();

     public static final ExtractorFactory<GeoExtractor> factory =

             SimpleExtractorFactory.create(

                     "html-mf-geo",

                     PopularPrefixes.createSubset("rdf", "vcard"),

                     Arrays.asList("text/html;q=0.1", "application/xhtml+xml;q=0.1"),

                     "example-mf-geo.html",

                     GeoExtractor.class

             );

     public ExtractorDescription getDescription() {

         return factory;

     }

     protected String getBaseClassName() {

         return "geo";

     }

     @Override

     protected void resetExtractor() {

         // Empty.

     }

     protected boolean extractEntity(Node node, ExtractionResult out) {

         if (null == node) return false;

         //try lat & lon

         final HTMLDocument document = new HTMLDocument(node);

         HTMLDocument.TextField latNode = document.getSingularTextField("latitude" );

         HTMLDocument.TextField lonNode = document.getSingularTextField("longitude");

         String lat = latNode.value();

         String lon = lonNode.value();

         if ("".equals(lat) || "".equals(lon)) {

             String[] both = document.getSingularUrlField("geo").value().split(";");

             if (both.length != 2) return false;

             lat = both[0];

             lon = both[1];

         }

         BNode geo = getBlankNodeFor(node);

         out.writeTriple(geo, RDF.TYPE, vVCARD.Location);

         final String extractorName = getDescription().getExtractorName();

         conditionallyAddStringProperty(

                 latNode.source(),

                 geo, vVCARD.latitude , lat

         );

         conditionallyAddStringProperty(

                 lonNode.source(),

                 geo, vVCARD.longitude, lon

         );

         final TagSoupExtractionResult tser = (TagSoupExtractionResult) getCurrentExtractionResult();

         tser.addResourceRoot( document.getPathToLocalRoot(), geo, this.getClass() );

         return true;

     }

 }