Visitor.h

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// $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;
  };
}
#endif // RDBMODEL_VISITOR_H