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/*************** Xobject H Declares Source Code File (.H) **************/
/* Name: XOBJECT.H Version 2.3 */
/* */
/* (C) Copyright to the author Olivier BERTRAND 1998-2012 */
/* */
/* This file contains the XOBJECT and derived classes declares. */
/***********************************************************************/
#ifndef __XOBJECT__H
#define __XOBJECT__H
/***********************************************************************/
/* Include required application header files */
/* block.h is header containing Block global declarations. */
/***********************************************************************/
#include "block.h"
#include "value.h"
/***********************************************************************/
/* Types used in some class definitions. */
/***********************************************************************/
typedef struct _tabdesc *PTABD; // For friend setting
/***********************************************************************/
/* The pointer to the one and only needed void object. */
/***********************************************************************/
extern PXOB const pXVOID;
/***********************************************************************/
/* Class XOBJECT is the base class for all classes that can be used */
/* in evaluation operations: FILTER, EXPRESSION, SCALF, FNC, COLBLK, */
/* SELECT, FILTER as well as all the constant object types. */
/***********************************************************************/
class DllExport XOBJECT : public BLOCK {
public:
XOBJECT(void) {Value = NULL; Constant = false;}
// Implementation
PVAL GetValue(void) {return Value;}
bool IsConstant(void) {return Constant;}
virtual int GetType(void) {return TYPE_XOBJECT;}
virtual int GetResultType(void) {return TYPE_VOID;}
virtual int GetKey(void) {return 0;}
#if defined(_DEBUG)
virtual void SetKey(int k) {assert(false);}
#else // !_DEBUG
virtual void SetKey(int k) {} // Only defined for COLBLK
#endif // !_DEBUG
virtual int GetLength(void) = 0;
virtual int GetLengthEx(void) = 0;
virtual PSZ GetCharValue(void);
virtual short GetShortValue(void);
virtual int GetIntValue(void);
virtual double GetFloatValue(void);
virtual int GetPrecision(void) = 0;
// Methods
virtual void Reset(void) {}
virtual bool Compare(PXOB) = 0;
virtual bool Init(PGLOBAL) {return false;}
virtual bool Eval(PGLOBAL) {return false;}
virtual bool SetFormat(PGLOBAL, FORMAT&) = 0;
virtual int CheckColumn(PGLOBAL, PSQL, PXOB &, int &) {return 0;}
virtual int RefNum(PSQL) {return 0;}
virtual void AddTdb(PSQL, PTDB *, int&) {}
virtual PXOB SetSelect(PGLOBAL, PSQL, bool) {return this;}
virtual PXOB CheckSubQuery(PGLOBAL, PSQL) {return this;}
virtual bool CheckLocal(PTDB) {return true;}
virtual int CheckSpcCol(PTDB, int) {return 2;}
virtual bool CheckSort(PTDB) {return false;}
virtual bool VerifyColumn(PTBX txp) {return false;}
virtual bool VerifyTdb(PTDB& tdbp) {return false;}
virtual bool IsColInside(PCOL colp) {return false;}
virtual void MarkCol(ushort) {}
protected:
PVAL Value; // The current value of the object.
bool Constant; // true for an object having a constant value.
}; // end of class XOBJECT
/***********************************************************************/
/* Class XVOID: represent a void (null) object. */
/* Used to represent a void parameter for count(*) or for a filter. */
/***********************************************************************/
class DllExport XVOID : public XOBJECT {
public:
XVOID(void) {Constant = true;}
// Implementation
virtual int GetType(void) {return TYPE_VOID;}
virtual int GetLength(void) {return 0;}
virtual int GetLengthEx(void) {return 0;}
virtual PSZ GetCharValue(void) {return NULL;}
virtual int GetIntValue(void) {return 0;}
virtual double GetFloatValue(void) {return 0.0;}
virtual int GetPrecision() {return 0;}
// Methods
virtual bool Compare(PXOB xp) {return xp->GetType() == TYPE_VOID;}
virtual bool SetFormat(PGLOBAL, FORMAT&) {return true;}
virtual int CheckSpcCol(PTDB, int) {return 0;}
}; // end of class XVOID
/***********************************************************************/
/* Class CONSTANT: represents a constant XOBJECT of any value type. */
/* Note that the CONSTANT class is a friend of the VALUE class; */
/***********************************************************************/
class DllExport CONSTANT : public XOBJECT {
public:
CONSTANT(PGLOBAL g, void *value, short type);
CONSTANT(PGLOBAL g, int n);
CONSTANT(PVAL valp) {Value = valp; Constant = true;}
// Implementation
virtual int GetType(void) {return TYPE_CONST;}
virtual int GetResultType(void) {return Value->Type;}
virtual int GetLength(void) {return Value->GetValLen();}
virtual int GetPrecision() {return Value->GetValPrec();}
virtual int GetLengthEx(void);
// Methods
virtual bool Compare(PXOB xp);
virtual bool SetFormat(PGLOBAL g, FORMAT& fmt)
{return Value->SetConstFormat(g, fmt);}
virtual int CheckSpcCol(PTDB, int) {return 1;}
void Convert(PGLOBAL g, int newtype);
bool Rephrase(PGLOBAL g, PSZ work);
void SetValue(PVAL vp) {Value = vp;}
virtual bool VerifyColumn(PTBX txp) {return true;}
virtual bool VerifyTdb(PTDB& tdbp) {return true;}
virtual void Print(PGLOBAL g, FILE *, uint);
virtual void Print(PGLOBAL g, char *, uint);
}; // end of class CONSTANT
#endif
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