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  package org.apache.cayenne.access.translator.select;
  
  import org.apache.cayenne.access.sqlbuilder.NodeBuilder;
  import org.apache.cayenne.access.sqlbuilder.OrderingNodeBuilder;
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.query.Ordering;
  
  import static org.apache.cayenne.access.sqlbuilder.SQLBuilder.*;
  
  /**
   * @since 4.2
   */
  class OrderingStage implements TranslationStage {
  
      @Override
      public void perform(TranslatorContext context) {
          if(context.getQuery().getOrderings() == null) {
              return;
          }
  
          QualifierTranslator qualifierTranslator = context.getQualifierTranslator();
          for(Ordering ordering : context.getQuery().getOrderings()) {
              processOrdering(qualifierTranslator, context, ordering);
          }
      }
  
      private void processOrdering(QualifierTranslator qualifierTranslator, TranslatorContext context, Ordering ordering) {
          Expression exp = ordering.getSortSpec();
          Node translatedNode = qualifierTranslator.translate(exp);
  
          NodeBuilder nodeBuilder = node(translatedNode);
          if(ordering.isCaseInsensitive()) {
              nodeBuilder = function("UPPER", nodeBuilder);
          }
  
          OrderingNodeBuilder orderingNodeBuilder = order(nodeBuilder);
          if(ordering.isDescending()) {
              orderingNodeBuilder.desc();
          }
          context.getSelectBuilder().orderBy(orderingNodeBuilder);
      }
  
  }
  