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  package org.apache.cayenne.access.translator.select;
  
  import org.apache.cayenne.access.sqlbuilder.sqltree.Node;
  import org.apache.cayenne.exp.path.CayennePath;
  import org.apache.cayenne.map.DbAttribute;
  
  import static org.apache.cayenne.access.sqlbuilder.SQLBuilder.table;
  
  /**
   * @since 4.2
   */
  abstract class BaseColumnExtractor implements ColumnExtractor {
  
      protected final TranslatorContext context;
  
      BaseColumnExtractor(TranslatorContext context) {
          this.context = context;
      }
  
      protected ResultNodeDescriptor addDbAttribute(CayennePath prefix, CayennePath labelPrefix, DbAttribute dba) {
          String alias = context.getTableTree().aliasForPath(prefix);
          CayennePath dataRowKey = labelPrefix.dot(dba.getName());
          Node columnNode = table(alias).column(dba).build();
          return context.addResultNode(columnNode, dataRowKey).setDbAttribute(dba);
      }
  }
  