code: package it.unibz.inf.ontop.model.term.functionsymbol.db.impl;
  
  import com.google.common.collect.ImmutableList;
  import it.unibz.inf.ontop.model.term.ImmutableTerm;
  import it.unibz.inf.ontop.model.term.TermFactory;
  import it.unibz.inf.ontop.model.type.DBTermType;
  
  import java.util.function.Function;
  
  public class MockupDBIfElseNullFunctionSymbol extends AbstractDBIfThenElseFunctionSymbol {
      protected MockupDBIfElseNullFunctionSymbol(DBTermType dbBooleanType, DBTermType rootDBTermType) {
          super(dbBooleanType, rootDBTermType);
      }
  
      @Override
      public String getNativeDBString(ImmutableList<? extends ImmutableTerm> terms, Function<ImmutableTerm, String> termConverter,
                                      TermFactory termFactory) {
          throw new UnsupportedOperationException();
      }
  }
  