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cQuery.h

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/******************************************************************************/
/*                                                                            */
/* POLiTe - Persistent Object Library Test                                    */
/*                                        Ph.D. Thesis by Mgr. Michal Kopecky */
/*                                                                            */
/* Charles University Prague                                                  */
/*                                                                            */
/******************************************************************************/
/*                                                                            */
/* File name: ...                                                             */
/* Module: ......                                                             */
/*                                                                            */
/******************************************************************************/

#ifndef __C_QUERY_H__
#define __C_QUERY_H__

// Common POLiTe Header(s)
#include <lDefs.h>
#include <lStr.h>

// Parent Header(s)
#include <cQueRefProto.h>

extern DLL_External const class Query ALL;
extern DLL_External const class Query NONE;
extern DLL_External const class Query EQUERY;

class DLL_External Query: public QueRefProto {
#ifdef POLITE_TEST_FRIEND
        friend POLITE_TEST_FRIEND;
#endif // POLITE_TEST_FRIEND

friend class ObjRef;
friend class Relation;
friend class ProtoBase;
friend class OneToOneRelationBase;
friend class OneToManyRelationBase;
friend class ManyToOneRelationBase;
friend class ManyToManyRelationBase;
friend class ChainedRelationBase;

protected:
        char *_where;
        char *_order_by;

public:
        Query(
                const char *const a_where = NULL,
                const char *const a_order_by = NULL
                );

        Query(
                const QueRefProto &X
                );

        Query(
                const Query &X
                );

        virtual ~Query();

        virtual char *Where() const {return _where;};

        virtual bool Where(const char * const a_where);

        virtual char *OrderBy() const {return _order_by;};

        virtual bool OrderBy(const char * const a_order_by);

        Query &Not(); //Provides query negation.

        Query &Or(const QueRefProto &Q); //Provides disjunction of two queries.

        Query &And(const QueRefProto &Q); //Provides conjunction of two queries.

        Query &Query::operator =(const QueRefProto &X);
        Query &Query::operator =(const Query &X);

protected:
        virtual char *_Where() const;
        virtual char *_OrderBy() const;

        };

#endif //__C_QUERY_H__

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