code: package it.unibz.inf.ontop.rdf4j.predefined.impl;
  
  import com.google.common.collect.ImmutableList;
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ImmutableMultimap;
  import it.unibz.inf.ontop.rdf4j.predefined.OntopRDF4JPredefinedQueryEngine;
  import org.eclipse.rdf4j.query.GraphQueryResult;
  import org.eclipse.rdf4j.query.QueryEvaluationException;
  import org.eclipse.rdf4j.rio.RDFHandlerException;
  
  import java.io.OutputStream;
  import java.util.function.BiConsumer;
  import java.util.function.Consumer;
  
  public class FakeOntopRDF4JPredefinedQueryEngine implements OntopRDF4JPredefinedQueryEngine {
  
      @Override
      public void evaluate(String queryId, ImmutableMap<String, String> bindings, ImmutableList<String> acceptMediaTypes,
                           ImmutableMultimap<String, String> httpHeaders, Consumer<Integer> httpStatusSetter,
                           BiConsumer<String, String> httpHeaderSetter, OutputStream outputStream)
              throws QueryEvaluationException, RDFHandlerException {
          // Not-recognized query id
          httpStatusSetter.accept(404);
      }
  
      @Override
      public String evaluate(String queryId, ImmutableMap<String, String> bindings, ImmutableList<String> acceptMediaTypes,
                             ImmutableMultimap<String, String> httpHeaders, Consumer<Integer> httpStatusSetter,
                             BiConsumer<String, String> httpHeaderSetter) {
          // Not-recognized query id
          httpStatusSetter.accept(404);
          return "Not found";
      }
  
      @Override
      public boolean shouldStream(String queryId) {
          return false;
      }
  
      @Override
      public GraphQueryResult evaluateGraph(String queryId, ImmutableMap<String, String> bindings) throws QueryEvaluationException {
          throw new UnsupportedOperationException("Intended to be used by the HTTP endpoint only");
      }
  }
  