code: package it.unibz.inf.ontop.rdf4j.query.impl;
  
  import it.unibz.inf.ontop.exception.OntopConnectionException;
  import it.unibz.inf.ontop.query.resultset.OntopBindingSet;
  import it.unibz.inf.ontop.query.resultset.TupleResultSet;
  
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  
  import it.unibz.inf.ontop.exception.OntopResultConversionException;
  import org.eclipse.rdf4j.query.Binding;
  import org.eclipse.rdf4j.query.BindingSet;
  import org.eclipse.rdf4j.query.QueryEvaluationException;
  import org.eclipse.rdf4j.query.TupleQueryResult;
  
  public class OntopTupleQueryResult implements TupleQueryResult {
  
  	private final byte[] salt;
  	TupleResultSet res;
  	List<String> signature;
  	Set<String> bindingNames;
  	
  	public OntopTupleQueryResult(TupleResultSet res, List<String> signature, byte[] salt){
  		this.salt = salt;
  		if(res == null)
  			throw new NullPointerException();
  		this.res = res;
  		this.signature = signature;
  		this.bindingNames = new HashSet<>(signature);
  	}
  	
  	@Override
  	public void close() throws QueryEvaluationException {
  		try {
  			res.close();
  		} catch (Exception e) {
  			throw new QueryEvaluationException(e);
  		}
  	}
  
  	@Override
  	public boolean hasNext() throws QueryEvaluationException {
  		try {
  			return res.hasNext();
  		} catch (Exception e) {
  			throw new QueryEvaluationException(e);
  		}
  	}
  
  	@Override
  	public BindingSet next() throws QueryEvaluationException {
          try {
              return new OntopRDF4JBindingSet(res.next(), salt);
          } catch (OntopConnectionException | OntopResultConversionException e) {
              throw new QueryEvaluationException(e);
  		}
  //
  //        MapBindingSet set = new MapBindingSet(this.signature.size() * 2);
  //		for (String name : this.signature) {
  //			Binding binding = createBinding(name, ontopBindingSet, this.bindingNames);
  //			if (binding != null) {
  //				set.addBinding(binding);
  //			}
  //		}
  
  	}
  
  	@Override
  	public void remove() throws QueryEvaluationException {
  		throw new QueryEvaluationException("The query result is read-only. Elements cannot be removed");
  	}
  	
  
  	private Binding createBinding(String bindingName, OntopBindingSet set) {
  		OntopRDF4JBindingSet bset = new OntopRDF4JBindingSet(set, salt);
  		return bset.getBinding(bindingName);
  	}
  
  
  	@Override
  	public List<String> getBindingNames() throws QueryEvaluationException {
  		return this.signature;
  	}
  
  }
  