code: package it.unibz.inf.ontop.generation.normalization.impl;
  
  import it.unibz.inf.ontop.generation.normalization.DialectExtraNormalizer;
  import it.unibz.inf.ontop.iq.IQTree;
  import it.unibz.inf.ontop.utils.VariableGenerator;
  
  import javax.inject.Inject;
  
  public class DB2ExtraNormalizer implements DialectExtraNormalizer {
  
      private final DialectExtraNormalizer enforceNullOrderNormalizer;
      private final DialectExtraNormalizer projectOrderByNormalizer;
  
      @Inject
      protected DB2ExtraNormalizer(EnforceNullOrderNormalizer enforceNullOrderNormalizer,
                                   OnlyInPresenceOfDistinctProjectOrderByTermsNormalizer projectOrderByNormalizer) {
          this.enforceNullOrderNormalizer = enforceNullOrderNormalizer;
          this.projectOrderByNormalizer = projectOrderByNormalizer;
      }
  
      @Override
      public IQTree transform(IQTree tree, VariableGenerator variableGenerator) {
          return projectOrderByNormalizer.transform(
                  enforceNullOrderNormalizer.transform(tree, variableGenerator),
                  variableGenerator);
      }
  }
  