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.Constant;
  import it.unibz.inf.ontop.model.term.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  
  import it.unibz.inf.ontop.model.type.RDFTermType;
  import it.unibz.inf.ontop.model.type.TermType;
  import it.unibz.inf.ontop.model.type.TermTypeInference;
  import it.unibz.inf.ontop.model.vocabulary.SPARQL;
  import java.util.Optional;
  
  /**
   * Non-deterministic when arity
   *
   * TODO: explain the use of the UUID
   *
   */
  public abstract class AbstractBnodeSPARQLFunctionSymbol extends SPARQLFunctionSymbolImpl {
  
      private final RDFTermType bnodeType;
  
      protected AbstractBnodeSPARQLFunctionSymbol(String name, ImmutableList<TermType> expectedBaseTypes, RDFTermType bnodeType) {
          super(name, SPARQL.BNODE, expectedBaseTypes);
          this.bnodeType = bnodeType;
      }
  
      @Override
      protected boolean tolerateNulls() {
          return false;
      }
  
      /**
       * Non-deterministic therefore non-injective
       */
      @Override
      public boolean isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms() {
          return false;
      }
  
      @Override
      public Optional<TermTypeInference> inferType(ImmutableList<? extends ImmutableTerm> terms) {
          return Optional.of(TermTypeInference.declareTermType(bnodeType));
      }
  
      @Override
      public boolean canBePostProcessed(ImmutableList<? extends ImmutableTerm> arguments) {
          return false;
      }
  
      @Override
      protected ImmutableTerm buildTermAfterEvaluation(ImmutableList<ImmutableTerm> newTerms, TermFactory termFactory,
                                                       VariableNullability variableNullability) {
  
          // Decomposes
          if (newTerms.stream().allMatch(t -> isRDFFunctionalTerm(t) || (t instanceof Constant))) {
              return termFactory.getRDFFunctionalTerm(
                      buildLexicalTerm(newTerms, termFactory),
                      termFactory.getRDFTermTypeConstant(bnodeType));
          }
  
          return super.buildTermAfterEvaluation(newTerms, termFactory, variableNullability);
      }
  
      protected abstract ImmutableTerm buildLexicalTerm(ImmutableList<ImmutableTerm> newTerms, TermFactory termFactory);
  }
  