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  package org.apache.cayenne.access.translator.select;
  
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  import org.apache.cayenne.exp.Expression;
  import org.apache.cayenne.exp.parser.ASTDbPath;
  import org.apache.cayenne.exp.parser.ASTObjPath;
  import org.apache.cayenne.exp.parser.SimpleNode;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.map.ObjEntity;
  import org.apache.cayenne.reflect.ClassDescriptor;
  
  /**
   * @since 4.2
   */
  class QualifierTranslationStage implements TranslationStage {
  
      @Override
      public void perform(TranslatorContext context) {
          QualifierTranslator translator = context.getQualifierTranslator();
  
          Expression expression = context.getQuery().getQualifier();
  
          // Attaching Obj entity's qualifier
          ObjEntity entity = context.getMetadata().getObjEntity();
          if (entity != null) {
              ClassDescriptor descriptor = context.getMetadata().getClassDescriptor();
              Expression entityQualifier = descriptor.getEntityInheritanceTree().qualifierForEntityAndSubclasses();
              if (entityQualifier != null) {
                  expression = expression == null ? entityQualifier : expression.andExp(entityQualifier);
              }
          }
  
          Node qualifierNode = translator.translate(expression);
          context.setQualifierNode(qualifierNode);
      }
  }
  