Calibration/rdbModel/include/rdbModel/Management/Visitor.h

Go to the documentation of this file.

// $Header: /bes/bes/BossCvs/Calibration/rdbModel/rdbModel/Management/Visitor.h,v 1.1.1.1
// 2005/10/17 06:10:53 maqm Exp $
#ifndef RDBMODEL_VISITOR_H
#define RDBMODEL_VISITOR_H
#include <string>
 
namespace rdbModel {
 
  class Rdb;
  class Table;
  class Column;
  class Index;
  class Assertion;
  class InsertNew;
  class Supersede;
  class Query;
  class InterRow;
  class Set;
 
  /**
   * This abstract class is the base for the visitors hierarchy; its
   * main purpouse is to provide an abstract interface common to all the
   * different kind of visitor; in this way the manager can hold a
   * list of visitors that the client can start.
   *
   * One likly visitor would be something which instantiates a suitable
   * representation, e.g. in a MySQL database, of the tables described
   *
   * @author J. Bogart,
   * but owing heavily to Visitor class in detModel; thanks to
   * D.Favretto and R.Giannitrapani
   */
  class Visitor {
  public:
    enum VisitorState {
      VCONTINUE = 0,
      VDONE,       // visitor has had its fill of visiting
      VBRANCHDONE, // don't descend further; go to next sibling, if any
      VERROR,      // error during visit; perhaps can continue, though
      VERRORABORT  // error during visit; can't handle more
    };
 
  public:
    /// This method says if the visitor is recursive or not
    //    bool getRecursive(){return recursive;}
    /// This method sets if the visitor is recursive or not
    //    void setRecursive(bool prec){recursive = prec;};
 
    virtual VisitorState visitRdb( Rdb* )             = 0;
    virtual VisitorState visitTable( Table* )         = 0;
    virtual VisitorState visitColumn( Column* )       = 0;
    virtual VisitorState visitIndex( Index* )         = 0;
    virtual VisitorState visitAssertion( Assertion* ) = 0;
    virtual VisitorState visitInsertNew( InsertNew* ) = 0;
    virtual VisitorState visitSupersede( Supersede* ) = 0;
    virtual VisitorState visitQuery( Query* )         = 0;
    virtual VisitorState visitSet( Set* )             = 0;
    virtual VisitorState visitInterRow( InterRow* )   = 0;
 
  protected:
    /// If this is true, the visitor is recursive, otherwise it is not.
    //    bool recursive;
  };
} // namespace rdbModel
#endif // RDBMODEL_VISITOR_H