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.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  import it.unibz.inf.ontop.model.type.RDFDatatype;
  import it.unibz.inf.ontop.model.type.TermTypeInference;
  
  import java.util.Optional;
  
  
  public class NumericBinarySPARQLFunctionSymbolImpl extends ReduciblePositiveAritySPARQLFunctionSymbolImpl {
  
      protected NumericBinarySPARQLFunctionSymbolImpl(String functionSymbolName, String officialName,
                                                      RDFDatatype abstractNumericType) {
          super(functionSymbolName, officialName, ImmutableList.of(abstractNumericType, abstractNumericType));
      }
  
      @Override
      protected ImmutableTerm computeTypeTerm(ImmutableList<? extends ImmutableTerm> subLexicalTerms,
                                              ImmutableList<ImmutableTerm> typeTerms, TermFactory termFactory,
                                              VariableNullability variableNullability) {
          return termFactory.getCommonPropagatedOrSubstitutedNumericType(typeTerms.get(0), typeTerms.get(1));
      }
  
      @Override
      protected ImmutableTerm computeLexicalTerm(ImmutableList<ImmutableTerm> subLexicalTerms,
                                                 ImmutableList<ImmutableTerm> typeTerms, TermFactory termFactory,
                                                 ImmutableTerm returnedRDFTypeTerm) {
          return termFactory.getBinaryNumericLexicalFunctionalTerm(getOfficialName(),
                  subLexicalTerms.get(0),
                  subLexicalTerms.get(1),
                  returnedRDFTypeTerm);
      }
  
      @Override
      public boolean isAlwaysInjectiveInTheAbsenceOfNonInjectiveFunctionalTerms() {
          return false;
      }
  
      /**
       * Too complex logic so not infer at this level (but after simplification into DB functional terms)
       */
      @Override
      public Optional<TermTypeInference> inferType(ImmutableList<? extends ImmutableTerm> terms) {
          return Optional.empty();
      }
  
      @Override
      public boolean canBePostProcessed(ImmutableList<? extends ImmutableTerm> arguments) {
          return false;
      }
  }
  