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/*************** tabjson H Declares Source Code File (.H) **************/
/* Name: tabjson.h Version 1.0 */
/* */
/* (C) Copyright to the author Olivier BERTRAND 2014 - 2015 */
/* */
/* This file contains the JSON classes declares. */
/***********************************************************************/
#include "osutil.h"
#include "block.h"
#include "colblk.h"
#include "json.h"
enum JMODE {MODE_OBJECT, MODE_ARRAY, MODE_VALUE};
typedef class JSONDEF *PJDEF;
typedef class TDBJSON *PJTDB;
typedef class JSONCOL *PJCOL;
/***********************************************************************/
/* The JSON tree node. Can be an Object or an Array. */
/***********************************************************************/
typedef struct _jnode {
PSZ Key; // The key used for object
OPVAL Op; // Operator used for this node
PVAL CncVal; // To cont value used for OP_CNC
PVAL Valp; // The internal array VALUE
int Rank; // The rank in array
int Nx; // Same row number
} JNODE, *PJNODE;
/***********************************************************************/
/* JSON table. */
/***********************************************************************/
class JSONDEF : public DOSDEF { /* Table description */
friend class TDBJSON;
friend class TDBJSN;
public:
// Constructor
JSONDEF(void);
// Implementation
virtual const char *GetType(void) {return "JSON";}
// Methods
virtual bool DefineAM(PGLOBAL g, LPCSTR am, int poff);
virtual PTDB GetTable(PGLOBAL g, MODE m);
protected:
// Members
JMODE Jmode; /* MODE_OBJECT by default */
char *Objname; /* Name of first level object */
char *Xcol; /* Name of expandable column */
int Limit; /* Limit of multiple values */
int Pretty; /* Depends on file structure */
bool Strict; /* Strict syntax checking */
}; // end of JSONDEF
/* -------------------------- TDBJSN class --------------------------- */
/***********************************************************************/
/* This is the JSN Access Method class declaration. */
/* The table is a DOS file, each record being a JSON object. */
/***********************************************************************/
class TDBJSN : public TDBDOS {
friend class JSONCOL;
public:
// Constructor
TDBJSN(PJDEF tdp, PTXF txfp);
TDBJSN(TDBJSN *tdbp);
// Implementation
virtual AMT GetAmType(void) {return TYPE_AM_JSN;}
virtual bool SkipHeader(PGLOBAL g);
virtual PTDB Duplicate(PGLOBAL g) {return (PTDB)new(g) TDBJSN(this);}
// Methods
virtual PTDB CopyOne(PTABS t);
virtual PCOL MakeCol(PGLOBAL g, PCOLDEF cdp, PCOL cprec, int n);
virtual PCOL InsertSpecialColumn(PGLOBAL g, PCOL colp);
virtual int RowNumber(PGLOBAL g, bool b = FALSE)
{return (b) ? N : Fpos + 1;}
// Database routines
virtual int Cardinality(PGLOBAL g);
virtual int GetMaxSize(PGLOBAL g);
virtual bool OpenDB(PGLOBAL g);
virtual bool PrepareWriting(PGLOBAL g);
virtual int ReadDB(PGLOBAL g);
protected:
// Members
PJSON Row; // The current row
PJCOL Colp; // The multiple column
JMODE Jmode; // MODE_OBJECT by default
char *Xcol; // Name of expandable column
int Fpos; // The current row index
//int Spos; // DELETE start index
int N; // The current Rownum
int Limit; // Limit of multiple values
int Pretty; // Depends on file structure
int NextSame; // Same next row
int SameRow; // Same row nb
int Xval; // Index of expandable array
bool Strict; // Strict syntax checking
bool Comma; // Row has final comma
}; // end of class TDBJSN
/* -------------------------- JSONCOL class -------------------------- */
/***********************************************************************/
/* Class JSONCOL: JSON access method column descriptor. */
/***********************************************************************/
class JSONCOL : public DOSCOL {
friend class TDBJSN;
friend class TDBJSON;
public:
// Constructors
JSONCOL(PGLOBAL g, PCOLDEF cdp, PTDB tdbp, PCOL cprec, int i);
JSONCOL(JSONCOL *colp, PTDB tdbp); // Constructor used in copy process
// Implementation
virtual int GetAmType(void) {return Tjp->GetAmType();}
// Methods
virtual bool SetBuffer(PGLOBAL g, PVAL value, bool ok, bool check);
bool ParseJpath(PGLOBAL g);
virtual void ReadColumn(PGLOBAL g);
virtual void WriteColumn(PGLOBAL g);
protected:
bool CheckExpand(PGLOBAL g, int i, PSZ nm, bool b);
bool SetArrayOptions(PGLOBAL g, char *p, int i, PSZ nm);
PVAL GetColumnValue(PGLOBAL g, PJSON row, int i);
PVAL ExpandArray(PGLOBAL g, PJAR arp, int n);
PVAL CalculateArray(PGLOBAL g, PJAR arp, int n);
PVAL MakeJson(PGLOBAL g, PJSON jsp);
void SetJsonValue(PGLOBAL g, PVAL vp, PJVAL val, int n);
PJSON GetRow(PGLOBAL g);
// Default constructor not to be used
JSONCOL(void) {}
// Members
TDBJSN *Tjp; // To the JSN table block
PVAL MulVal; // To value used by multiple column
char *Jpath; // The json path
JNODE *Nodes; // The intermediate objects
int Nod; // The number of intermediate objects
int Xnod; // Index of multiple values
bool Xpd; // True for expandable column
bool Parsed; // True when parsed
}; // end of class JSONCOL
/* -------------------------- TDBJSON class -------------------------- */
/***********************************************************************/
/* This is the JSON Access Method class declaration. */
/***********************************************************************/
class TDBJSON : public TDBJSN {
friend class JSONCOL;
public:
// Constructor
TDBJSON(PJDEF tdp, PTXF txfp);
TDBJSON(PJTDB tdbp);
// Implementation
virtual AMT GetAmType(void) {return TYPE_AM_JSON;}
virtual PTDB Duplicate(PGLOBAL g) {return (PTDB)new(g) TDBJSON(this);}
// Methods
virtual PTDB CopyOne(PTABS t);
// Database routines
virtual int Cardinality(PGLOBAL g);
virtual int GetMaxSize(PGLOBAL g);
virtual void ResetSize(void);
virtual int GetProgCur(void) {return N;}
virtual int GetRecpos(void);
virtual bool SetRecpos(PGLOBAL g, int recpos);
virtual bool OpenDB(PGLOBAL g);
virtual int ReadDB(PGLOBAL g);
virtual bool PrepareWriting(PGLOBAL g) {return false;}
virtual int WriteDB(PGLOBAL g);
virtual int DeleteDB(PGLOBAL g, int irc);
virtual void CloseDB(PGLOBAL g);
// Optimization routines
virtual int MakeIndex(PGLOBAL g, PIXDEF pxdf, bool add);
protected:
int MakeNewDoc(PGLOBAL g);
int MakeDocument(PGLOBAL g);
// Members
PJSON Top; // The file JSON tree
PJAR Doc; // The document array
char *Objname; // The table object name
int Multiple; // 0: No 1: DIR 2: Section 3: filelist
bool Done; // True when document parsing is done
bool Changed; // After Update, Insert or Delete
}; // end of class TDBJSON
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