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package lb5;

import java.io.InputStream;
import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.rdf.model.Property;
import org.apache.jena.rdf.model.RDFNode;
import org.apache.jena.rdf.model.Resource;
import org.apache.jena.rdf.model.Statement;
import org.apache.jena.rdf.model.StmtIterator;
import org.apache.jena.util.FileManager;

/**
 *
 * @author Sasho
 */
public class LB5 {

    /**
     * @param args the command line arguments
     */

     static final String inFile = "https://www.dropbox.com/s/lhlajc03dp51fxl/foaf.ttl?dl=1";

    public static void main(String[] args) {
        // TODO code application logic here
          Model model = ModelFactory.createDefaultModel();


          Model temp = ModelFactory.createDefaultModel();
          Model suma = ModelFactory.createDefaultModel();



          Property pro = model.createProperty("http://xmlns.com/foaf/0.1/knows");
          Property pro2 = model.createProperty("http://www.w3.org/2000/01/rdf-schema#seeAlso");
          InputStream in = FileManager.get().open(inFile);
           if(in == null){
           throw new IllegalArgumentException("File: "+ inFile + " not found");
                         }
            model.read(in, inFile, "TTL");
           // model.write(System.out, "TURTLE");

             StmtIterator iter = model.listStatements();


             while(iter.hasNext()){
            Statement stmt = iter.nextStatement();
            Resource subject = stmt.getSubject();
            Property predicate = stmt.getPredicate();
            RDFNode object = stmt.getObject();

             //   System.out.println(predicate.toString());
             //   System.out.println(object.toString());
           if(predicate.toString().equals("http://www.w3.org/2000/01/rdf-schema#seeAlso")){
               //System.out.println(object.toString());

                  String inFiles = object.toString();
                  InputStream in2 = FileManager.get().open(inFiles);
           if(in2 == null){
           throw new IllegalArgumentException("File: "+ inFiles + " not found");
                         }
            temp.read(in2, inFiles, "TTL");
            temp.write(System.out, "TURTLE");
            ModelFactory.createUnion(temp, suma);

               }

             }



          //   suma.write(System.out, "TURTLE");


    }

}