code: package it.unibz.inf.ontop.model.term.functionsymbol.impl;
  
  import com.google.common.collect.ImmutableList;
  import it.unibz.inf.ontop.iq.node.VariableNullability;
  import it.unibz.inf.ontop.model.term.ImmutableFunctionalTerm;
  import it.unibz.inf.ontop.model.term.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  import it.unibz.inf.ontop.model.term.functionsymbol.SPARQLFunctionSymbol;
  import it.unibz.inf.ontop.model.type.ObjectRDFType;
  import it.unibz.inf.ontop.model.type.TermTypeInference;
  import it.unibz.inf.ontop.model.vocabulary.SPARQL;
  import org.apache.commons.rdf.api.IRI;
  
  import java.util.Optional;
  import java.util.UUID;
  
  public class UUIDSPARQLFunctionSymbolImpl extends FunctionSymbolImpl implements SPARQLFunctionSymbol {
  
      private static final String URN_UUID_PREFIX = "urn:uuid:";
      private final UUID uuid;
      private final ObjectRDFType iriStringType;
  
      protected UUIDSPARQLFunctionSymbolImpl(UUID uuid, ObjectRDFType iriStringType) {
          super("SP_UUID", ImmutableList.of());
          this.uuid = uuid;
          this.iriStringType = iriStringType;
      }
  
      @Override
      protected boolean mayReturnNullWithoutNullArguments() {
          return false;
      }
  
      @Override
      protected boolean tolerateNulls() {
          return false;
      }
  
      @Override
      public boolean isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms() {
          return false;
      }
  
      @Override
      public Optional<TermTypeInference> inferType(ImmutableList<? extends ImmutableTerm> terms) {
          return Optional.of(TermTypeInference.declareTermType(iriStringType));
      }
  
      @Override
      public boolean canBePostProcessed(ImmutableList<? extends ImmutableTerm> arguments) {
          return false;
      }
  
      @Override
      public Optional<IRI> getIRI() {
          return Optional.empty();
      }
  
      @Override
      public String getOfficialName() {
          return SPARQL.UUID;
      }
  
      @Override
      protected ImmutableTerm buildTermAfterEvaluation(ImmutableList<ImmutableTerm> newTerms,
                                                       TermFactory termFactory,
                                                       VariableNullability variableNullability) {
          ImmutableFunctionalTerm lexicalTerm =
                  termFactory.getNullRejectingDBConcatFunctionalTerm(
                          ImmutableList.of(
                                  termFactory.getDBStringConstant(URN_UUID_PREFIX),
                                  termFactory.getDBUUID(uuid)));
          return termFactory.getRDFFunctionalTerm(lexicalTerm, termFactory.getRDFTermTypeConstant(iriStringType));
      }
  }
  