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 it.unibz.inf.ontop.model.type.TermType;
  
  import java.util.function.Function;
  import java.util.stream.Collectors;
  
  public abstract class StandardNotationDBBooleanFunctionSymbolImpl extends DBBooleanFunctionSymbolImpl {
  
      private final String nameInDialect;
      private static final String FUNCTIONAL_TEMPLATE = "%s(%s)";
  
      protected StandardNotationDBBooleanFunctionSymbolImpl(String nameInDialect, ImmutableList<TermType> expectedBaseTypes,
                                                            DBTermType dbBooleanTermType) {
          super(nameInDialect + expectedBaseTypes.size(), expectedBaseTypes, dbBooleanTermType);
          this.nameInDialect = nameInDialect;
      }
  
      @Override
      public String getNativeDBString(ImmutableList<? extends ImmutableTerm> terms,
                                      Function<ImmutableTerm, String> termConverter, TermFactory termFactory) {
          return String.format(FUNCTIONAL_TEMPLATE, nameInDialect,
                  terms.stream()
                          .map(termConverter::apply)
                          .collect(Collectors.joining(",")));
      }
  }
  