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/*************** Xobject H Declares Source Code File (.H) **************/
/* Name: XOBJECT.H Version 2.4 */
/* */
/* (C) Copyright to the author Olivier BERTRAND 1998-2014 */
/* */
/* 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 "valblk.h" // includes value.h
/***********************************************************************/
/* Types used in some class definitions. */
/***********************************************************************/
typedef class STRING *PSTRG;
/***********************************************************************/
/* 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) {assert(false);}
#else // !_DEBUG
virtual void SetKey(int) {} // 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 GetScale(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;
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 GetScale() {return 0;}
// Methods
virtual bool Compare(PXOB xp) {return xp->GetType() == TYPE_VOID;}
virtual bool SetFormat(PGLOBAL, FORMAT&) {return true;}
}; // 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 GetScale() {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);}
void Convert(PGLOBAL g, int newtype);
void SetValue(PVAL vp) {Value = vp;}
virtual void Print(PGLOBAL g, FILE *, uint);
virtual void Print(PGLOBAL g, char *, uint);
}; // end of class CONSTANT
/***********************************************************************/
/* Class STRING handles variable length char strings. */
/* It is mainly used to avoid buffer overrun. */
/***********************************************************************/
class DllExport STRING : public BLOCK {
public:
// Constructor
STRING(PGLOBAL g, uint n, PSZ str = NULL);
// Implementation
inline int GetLength(void) {return (int)Length;}
inline PSZ GetStr(void) {return Strp;}
inline uint32 GetSize(void) {return Size;}
// Methods
inline void Reset(void) {*Strp = 0;}
bool Set(PSZ s);
bool Set(char *s, uint n);
bool Append(const char *s, uint ln);
bool Append(PSZ s);
bool Append(STRING &str);
bool Append(char c);
bool Resize(uint n);
bool Append_quoted(PSZ s);
inline void Trim(void) {(void)Resize(Length + 1);}
inline void Chop(void) {if (Length) Strp[--Length] = 0;}
inline void RepLast(char c) {if (Length) Strp[Length-1] = c;}
inline void Truncate(uint n) {if (n < Length) {Strp[n] = 0; Length = n;}}
protected:
char *Realloc(uint len);
inline char *GetNext(void)
{return ((char*)G->Sarea)+((PPOOLHEADER)G->Sarea)->To_Free;}
// Members
PGLOBAL G; // To avoid parameter
PSZ Strp; // The char string
uint Length; // String length
uint Size; // Allocated size
char *Next; // Next alloc position
}; // end of class STRING
#endif
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