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 DefaultSQLIfThenElseFunctionSymbol extends AbstractDBIfThenElseFunctionSymbol {
  
      private static final String TEMPLATE = "CASE WHEN %s THEN %s ELSE %s END";
  
      protected DefaultSQLIfThenElseFunctionSymbol(DBTermType dbBooleanType, DBTermType rootDBTermType) {
          super(dbBooleanType, rootDBTermType);
      }
  
      @Override
      public String getNativeDBString(ImmutableList<? extends ImmutableTerm> terms,
                                      Function<ImmutableTerm, String> termConverter, TermFactory termFactory) {
          return String.format(
                  TEMPLATE,
                  terms.stream()
                          .map(termConverter::apply)
                          .toArray());
      }
  }
  