/*

  * 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.extractor.Extractor.TagSoupDOMExtractor;

 import org.openrdf.model.BNode;

 import org.openrdf.model.URI;

 import org.openrdf.model.ValueFactory;

 import org.openrdf.model.impl.ValueFactoryImpl;

 import org.w3c.dom.Document;

 import java.io.IOException;

 import java.util.Arrays;

 /**

  * Extractor for "ICBM coordinates" provided as META headers in the head

  * of an HTML page.

  *

  * @author Gabriele Renzi

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

  */

 public class ICBMExtractor implements TagSoupDOMExtractor {

     public final static ExtractorFactory<ICBMExtractor> factory =

             SimpleExtractorFactory.create(

                     "html-head-icbm",

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

                     Arrays.asList("text/html;q=0.01", "application/xhtml+xml;q=0.01"),

                     "example-icbm.html",

                     ICBMExtractor.class

             );

     public void run(

             ExtractionParameters extractionParameters,

             ExtractionContext extractionContext,

             Document in,

             ExtractionResult out

     ) throws IOException, ExtractionException {

         // ICBM is the preferred method, if two values are available it is meaningless to read both

         String props = DomUtils.find(in, "//META[@name=\"ICBM\" or @name=\"geo.position\"]/@content");

         if ("".equals(props)) return;

         String[] coords = props.split("[;,]");

         float lat, lon;

         try {

             lat = Float.parseFloat(coords[0]);

             lon = Float.parseFloat(coords[1]);

         } catch (NumberFormatException nfe) {

             return;

         }

         final ValueFactory factory = new Any23ValueFactoryWrapper(ValueFactoryImpl.getInstance(), out);

         BNode point = factory.createBNode();

         out.writeTriple(extractionContext.getDocumentURI(), expand("dcterms:related"), point);

         out.writeTriple(point, expand("rdf:type"), expand("geo:Point"));

         out.writeTriple(point, expand("geo:lat"), factory.createLiteral(Float.toString(lat)));

         out.writeTriple(point, expand("geo:long"), factory.createLiteral(Float.toString(lon)));

     }

     private URI expand(String curie) {

         return factory.getPrefixes().expand(curie);

     }

     public ExtractorDescription getDescription() {

         return factory;

     }

 }