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Field.hpp
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/
Field.hpp
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/******************************************************************************
**
** MODULE: FIELD.HPP
** COMPONENT: Memory Database Library.
** DESCRIPTION: The CField class declaration.
**
*******************************************************************************
*/
// Check for previous inclusion
#ifndef FIELD_HPP
#define FIELD_HPP
#if _MSC_VER > 1000
#pragma once
#endif
#include "FwdDecls.hpp"
#include "Value.hpp"
/******************************************************************************
**
** The class that is used to store the value for a rows' column.
**
*******************************************************************************
*/
class CField
{
public:
//
// Parents.
//
CRow& Row() const;
CColumn& Column() const;
//
// Accessors.
//
int GetInt() const;
int64 GetInt64() const;
double GetDouble() const;
tchar GetChar() const;
const tchar* GetString() const;
bool GetBool() const;
time_t GetDateTime() const;
const CTimeStamp& GetTimeStamp() const;
CValue GetValue() const;
void* GetPtr() const;
CRow* GetRowPtr() const;
CRow** GetRowSetPtr() const;
void GetRaw(void* pValue) const;
//
// Mutators.
//
void SetNull();
void SetInt(int iValue);
void SetInt64(int64 iValue);
void SetDouble(double dValue);
void SetChar(tchar cValue);
void SetString(const tchar* sValue);
void SetBool(bool bValue);
void SetDateTime(time_t tValue);
void SetTimeStamp(const CTimeStamp& tsValue);
void SetField(const CField& oValue);
void SetPtr(void* pValue);
void SetRowPtr(CRow* pValue);
void SetRowSetPtr(CRow** pValue);
void SetRaw(const void* pValue);
//
// Conversion operators.
//
operator int() const;
operator double() const;
operator tchar() const;
operator const tchar*() const;
operator bool() const;
operator time_t() const;
operator const CTimeStamp&() const;
operator CValue() const;
operator void*() const;
operator CRow*() const;
operator CRow**() const;
CField& operator=(const CNull& oNull);
CField& operator=(int iValue);
CField& operator=(double dValue);
CField& operator=(tchar cValue);
CField& operator=(const tchar* sValue);
CField& operator=(bool bValue);
CField& operator=(time_t tValue);
CField& operator=(const CTimeStamp& tsValue);
CField& operator=(const CField& oValue);
CField& operator=(void* pValue);
CField& operator=(CRow* pValue);
CField& operator=(CRow** pValue);
//
// Comparison operators.
//
bool operator==(const CNull& oNull) const;
bool operator!=(const CNull& oNull) const;
bool operator==(int iValue) const;
bool operator!=(int iValue) const;
bool operator==(double dValue) const;
bool operator!=(double dValue) const;
bool operator==(tchar cValue) const;
bool operator!=(tchar cValue) const;
bool operator==(const tchar* sValue) const;
bool operator!=(const tchar* sValue) const;
bool operator==(bool bValue) const;
bool operator!=(bool bValue) const;
bool operator==(const CValue& oValue) const;
bool operator!=(const CValue& oValue) const;
bool operator==(const CField& oValue) const;
bool operator!=(const CField& oValue) const;
int Compare(const CField& oValue) const;
int Compare(const CValue& oValue) const;
//
// Persistance methods.
//
bool Modified() const;
//
// String formatting methods.
//
CString Format(const tchar* pszFormat = NULL) const;
CString DbgFormat() const;
protected:
//
// Members.
//
CRow& m_oRow; // The parent row.
CColumn& m_oColumn; // The parent column.
size_t m_nColumn; // The parent column index.
bool m_bModified; // Modified flag.
bool m_bNull; // NULL flag.
union
{
int* m_pInt; // Pointer to value if type is MDCT_INT or MDCT_IDENTITY.
int64* m_pInt64; // Pointer to value if type is MDCT_INT64.
double* m_pDouble; // Pointer to value if type is MDCT_DOUBLE.
tchar* m_pChar; // Pointer to value if type is MDCT_CHAR.
tchar* m_pString; // Pointer to value if type is MDCT_FXDSTR or MDCT_VARSTR.
bool* m_pBool; // Pointer to value if type is MDCT_BOOL.
time_t* m_pTimeT; // Pointer to value if type is MDCT_DATETIME or MDCT_DATE or MDCT_TIME.
CTimeStamp* m_pTimeStamp; // Pointer to value if type is MDCT_TIMESTAMP.
void* m_pVoidPtr; // Value if type is MDCT_VOIDPTR.
CRow* m_pRowPtr; // Value if type is MDCT_ROWPTR.
CRow** m_pRowSetPtr; // Value if type is MDCT_ROWSETPTR.
};
//
// Friends.
//
friend class CRow;
private:
//
// Only allow CRow to create and destroy.
//
CField(CRow& oRow, CColumn& oColumn, size_t nColumn, bool bNull, void* pData);
~CField();
#pragma push_macro("new")
#undef new
//
// Placement new/delete operators.
//
void* operator new(size_t n, void* p);
void operator delete(void* p, void* p2);
void operator delete(void* p);
#pragma pop_macro("new")
//
// Disallow copies for now.
//
CField(const CField& oValue);
//
// Internal methods.
//
void Updated();
CString FormatTimeT(const tchar* pszFormat) const;
CString FormatTimeStamp(const tchar* pszFormat) const;
CString FormatBool(const tchar* pszFormat) const;
int StrCmp(const tchar* pszRHS) const;
};
/******************************************************************************
**
** Implementation of inline functions.
**
*******************************************************************************
*/
inline CRow& CField::Row() const
{
return m_oRow;
}
inline CColumn& CField::Column() const
{
return m_oColumn;
}
#pragma push_macro("new")
#undef new
inline void* CField::operator new(size_t, void* p)
{
return p;
}
inline void CField::operator delete(void*, void*)
{
}
inline void CField::operator delete(void*)
{
}
#pragma pop_macro("new")
inline CField::operator int() const
{
return GetInt();
}
inline CField::operator double() const
{
return GetDouble();
}
inline CField::operator tchar() const
{
return GetChar();
}
inline CField::operator const tchar*() const
{
return GetString();
}
inline CField::operator bool() const
{
return GetBool();
}
inline CField::operator time_t() const
{
return GetDateTime();
}
inline CField::operator const CTimeStamp&() const
{
return GetTimeStamp();
}
inline CField::operator CValue() const
{
return GetValue();
}
inline CField::operator void*() const
{
return GetPtr();
}
inline CField::operator CRow*() const
{
return GetRowPtr();
}
inline CField::operator CRow**() const
{
return GetRowSetPtr();
}
inline CField& CField::operator=(const CNull&)
{
SetNull();
return *this;
}
inline CField& CField::operator=(int iValue)
{
SetInt(iValue);
return *this;
}
inline CField& CField::operator=(double dValue)
{
SetDouble(dValue);
return *this;
}
inline CField& CField::operator=(tchar cValue)
{
SetChar(cValue);
return *this;
}
inline CField& CField::operator=(const tchar* sValue)
{
SetString(sValue);
return *this;
}
inline CField& CField::operator=(bool bValue)
{
SetBool(bValue);
return *this;
}
inline CField& CField::operator=(time_t tValue)
{
SetDateTime(tValue);
return *this;
}
inline CField& CField::operator=(const CTimeStamp& tsValue)
{
SetTimeStamp(tsValue);
return *this;
}
inline CField& CField::operator=(const CField& oValue)
{
SetField(oValue);
return *this;
}
inline CField& CField::operator=(void* pValue)
{
SetPtr(pValue);
return *this;
}
inline CField& CField::operator=(CRow* pValue)
{
SetRowPtr(pValue);
return *this;
}
inline CField& CField::operator=(CRow** pValue)
{
SetRowSetPtr(pValue);
return *this;
}
inline bool CField::operator==(const CNull&) const
{
return m_bNull;
}
inline bool CField::operator!=(const CNull&) const
{
return !m_bNull;
}
inline bool CField::operator==(int iValue) const
{
return (iValue == GetInt());
}
inline bool CField::operator!=(int iValue) const
{
return (iValue != GetInt());
}
inline bool CField::operator==(double dValue) const
{
return (dValue == GetDouble());
}
inline bool CField::operator!=(double dValue) const
{
return (dValue != GetDouble());
}
inline bool CField::operator==(tchar cValue) const
{
return (cValue == GetChar());
}
inline bool CField::operator!=(tchar cValue) const
{
return (cValue != GetChar());
}
inline bool CField::operator==(const tchar* sValue) const
{
return (tstrcmp(sValue, GetString()) == 0);
}
inline bool CField::operator!=(const tchar* sValue) const
{
return (tstrcmp(sValue, GetString()) != 0);
}
inline bool CField::operator==(bool bValue) const
{
return (bValue == GetBool());
}
inline bool CField::operator!=(bool bValue) const
{
return (bValue != GetBool());
}
inline bool CField::operator!=(const CValue& oValue) const
{
return !operator==(oValue);
}
inline bool CField::operator==(const CField& oValue) const
{
return operator==(oValue.GetValue());
}
inline bool CField::operator!=(const CField& oValue) const
{
return !operator==(oValue);
}
inline bool CField::Modified() const
{
return m_bModified;
}
#endif //FIELD_HPP