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  package org.apache.cayenne.query;
  
  /**
   * A factory interface to create standard SQLActions for a set of standard queries.
   * Instances of SQLActionVisitor are passed by Cayenne to a Query in
   * {@link org.apache.cayenne.query.Query#createSQLAction(SQLActionVisitor)}, allowing
   * query to choose the action type and convert itself to a "standard" query if needed.
   * Individual DbAdapters would provide special visitors, thus allowing for DB-dependent
   * execution algorithms.
   * 
   * @see org.apache.cayenne.query.Query#createSQLAction(SQLActionVisitor)
   * @since 1.2
   */
  public interface SQLActionVisitor {
  
      /**
       * Creates an action to execute a batch update query.
       */
      SQLAction batchAction(BatchQuery query);
  
      /**
       * Creates an action to execute a FluentSelect.
       * @since 4.2
       */
      <T> SQLAction objectSelectAction(FluentSelect<T,?> query);
  
      /**
       * Creates an action to execute a SQLTemplate.
       */
      SQLAction sqlAction(SQLTemplate query);
  
      /**
       * Creates an action to execute a ProcedureQuery.
       */
      SQLAction procedureAction(ProcedureQuery query);
  
      /**
       * Creates an action to execute EJBQL query.
       */
      SQLAction ejbqlAction(EJBQLQuery query);
  }
  