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198 lines
7.9 KiB
C++
198 lines
7.9 KiB
C++
/************** FilAMTxt H Declares Source Code File (.H) **************/
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/* Name: FILAMTXT.H Version 1.2 */
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/* */
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/* (C) Copyright to the author Olivier BERTRAND 2005-2012 */
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/* */
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/* This file contains the file access method classes declares. */
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/***********************************************************************/
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#ifndef __FILAMTXT_H
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#define __FILAMTXT_H
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#include "block.h"
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typedef class TXTFAM *PTXF;
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typedef class DOSFAM *PDOSFAM;
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typedef class BLKFAM *PBLKFAM;
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typedef class DOSDEF *PDOSDEF;
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typedef class TDBDOS *PTDBDOS;
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#define TYPE_AM_BLK (AMT)160
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/***********************************************************************/
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/* This is the base class for all file access method classes. */
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/***********************************************************************/
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class DllExport TXTFAM : public BLOCK {
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friend class TDBDOS;
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friend class TDBCSV;
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friend class TDBFIX;
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friend class TDBVCT;
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friend class DOSCOL;
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friend class BINCOL;
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friend class VCTCOL;
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public:
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// Constructor
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TXTFAM(PDOSDEF tdp);
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TXTFAM(PTXF txfp);
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// Implementation
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virtual AMT GetAmType(void) = 0;
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virtual int GetPos(void) = 0;
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virtual int GetNextPos(void) = 0;
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virtual PTXF Duplicate(PGLOBAL g) = 0;
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virtual bool GetUseTemp(void) {return false;}
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virtual int GetDelRows(void) {return DelRows;}
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int GetCurBlk(void) {return CurBlk;}
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void SetTdbp(PTDBDOS tdbp) {Tdbp = tdbp;}
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int GetBlock(void) {return Block;}
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void SetBlkPos(int *bkp) {BlkPos = bkp;}
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void SetNrec(int n) {Nrec = n;}
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char *GetBuf(void) {return To_Buf;}
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int GetRows(void) {return Rows;}
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bool IsBlocked(void) {return Blocked;}
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// Methods
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virtual void Reset(void);
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virtual int GetFileLength(PGLOBAL g);
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virtual int Cardinality(PGLOBAL g);
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virtual int MaxBlkSize(PGLOBAL g, int s);
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virtual bool AllocateBuffer(PGLOBAL g) {return false;}
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virtual void ResetBuffer(PGLOBAL g) {}
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virtual int GetNerr(void) {return 0;}
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virtual int GetRowID(void) = 0;
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virtual bool RecordPos(PGLOBAL g) = 0;
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virtual bool SetPos(PGLOBAL g, int recpos) = 0;
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virtual int SkipRecord(PGLOBAL g, bool header) = 0;
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virtual bool OpenTableFile(PGLOBAL g) = 0;
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virtual bool DeferReading(void) {IsRead = false; return true;}
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virtual int ReadBuffer(PGLOBAL g) = 0;
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virtual int WriteBuffer(PGLOBAL g) = 0;
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virtual int DeleteRecords(PGLOBAL g, int irc) = 0;
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virtual void CloseTableFile(PGLOBAL g) = 0;
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virtual void Rewind(void) = 0;
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protected:
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// Members
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PTDBDOS Tdbp; // To table class
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PSZ To_File; // Points to table file name
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PFBLOCK To_Fb; // Pointer to file block
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bool Placed; // true if Recpos was externally set
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bool IsRead; // false for deferred reading
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bool Blocked; // true if using blocked I/O
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char *To_Buf; // Points to I/O buffer
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void *DelBuf; // Buffer used to move lines in Delete
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int *BlkPos; // To array of block positions
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int BlkLen; // Current block length
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int Buflen; // Buffer length
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int Dbflen; // Delete buffer length
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int Rows; // Number of rows read so far
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int DelRows; // Number of deleted rows
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int Headlen; // Number of bytes in header
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int Lrecl; // Logical Record Length
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int Block; // Number of blocks in table
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int Last; // Number of elements of last block
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int Nrec; // Number of records in buffer
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int OldBlk; // Index of last read block
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int CurBlk; // Index of current block
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int CurNum; // Current buffer line number
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int ReadBlks; // Number of blocks read (selected)
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int Rbuf; // Number of lines read in buffer
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int Modif; // Number of modified lines in block
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int Blksize; // Size of padded blocks
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int Ending; // Length of line end
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bool Padded; // true if fixed size blocks are padded
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bool Eof; // true if an EOF (0xA) character exists
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char *CrLf; // End of line character(s)
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}; // end of class TXTFAM
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/***********************************************************************/
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/* This is the DOS/UNIX Access Method class declaration for standard */
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/* text files with variable record format (DOS, CSV, FMT) */
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/***********************************************************************/
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class DllExport DOSFAM : public TXTFAM {
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public:
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// Constructor
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DOSFAM(PDOSDEF tdp);
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DOSFAM(PDOSFAM txfp);
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// Implementation
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virtual AMT GetAmType(void) {return TYPE_AM_DOS;}
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virtual bool GetUseTemp(void) {return UseTemp;}
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virtual int GetPos(void);
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virtual int GetNextPos(void);
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virtual PTXF Duplicate(PGLOBAL g)
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{return (PTXF)new(g) DOSFAM(this);}
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// Methods
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virtual void Reset(void);
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virtual int GetFileLength(PGLOBAL g);
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virtual int Cardinality(PGLOBAL g);
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virtual int MaxBlkSize(PGLOBAL g, int s);
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virtual bool AllocateBuffer(PGLOBAL g);
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virtual int GetRowID(void);
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virtual bool RecordPos(PGLOBAL g);
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virtual bool SetPos(PGLOBAL g, int recpos);
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virtual int SkipRecord(PGLOBAL g, bool header);
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virtual bool OpenTableFile(PGLOBAL g);
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virtual int ReadBuffer(PGLOBAL g);
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virtual int WriteBuffer(PGLOBAL g);
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virtual int DeleteRecords(PGLOBAL g, int irc);
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virtual void CloseTableFile(PGLOBAL g);
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virtual void Rewind(void);
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protected:
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virtual bool OpenTempFile(PGLOBAL g);
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virtual bool MoveIntermediateLines(PGLOBAL g, bool *b);
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virtual int RenameTempFile(PGLOBAL g);
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// Members
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FILE *Stream; // Points to Dos file structure
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FILE *T_Stream; // Points to temporary file structure
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PFBLOCK To_Fbt; // Pointer to temp file block
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int Fpos; // Position of last read record
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int Tpos; // Target Position for delete move
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int Spos; // Start position for delete move
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bool UseTemp; // True to use a temporary file in Delete
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bool Bin; // True to force binary mode
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}; // end of class DOSFAM
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/***********************************************************************/
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/* This is the DOS/UNIX Access Method class declaration for standard */
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/* text files with variable record format (DOS, CSV, FMT) */
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/***********************************************************************/
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class DllExport BLKFAM : public DOSFAM {
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public:
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// Constructor
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BLKFAM(PDOSDEF tdp);
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BLKFAM(PBLKFAM txfp);
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// Implementation
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virtual AMT GetAmType(void) {return TYPE_AM_BLK;}
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virtual int GetPos(void);
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virtual int GetNextPos(void);
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virtual PTXF Duplicate(PGLOBAL g)
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{return (PTXF)new(g) BLKFAM(this);}
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// Methods
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virtual void Reset(void);
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virtual int Cardinality(PGLOBAL g);
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virtual int MaxBlkSize(PGLOBAL g, int s);
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virtual bool AllocateBuffer(PGLOBAL g);
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virtual int GetRowID(void);
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virtual bool RecordPos(PGLOBAL g);
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virtual bool SetPos(PGLOBAL g, int recpos);
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virtual int SkipRecord(PGLOBAL g, bool header);
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virtual int ReadBuffer(PGLOBAL g);
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virtual int WriteBuffer(PGLOBAL g);
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virtual void CloseTableFile(PGLOBAL g);
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virtual void Rewind(void);
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protected:
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// Members
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char *CurLine; // Position of current line in buffer
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char *NxtLine; // Position of Next line in buffer
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char *OutBuf; // Buffer to write in temporary file
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bool Closing; // True when closing on Update
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}; // end of class BLKFAM
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#endif // __FILAMTXT_H
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