tabindfile.h

linux下一款GIS程序源码

// tabindfile.h: interface for the TABINDFile class.
//
/*---------------------------------------------------------------------
 *                      class TABINDFile
 *
 * Class to handle table field index (.IND) files... we use this
 * class as the main entry point to open and search the table field indexes.
 * Note that .IND files are supported for read access only.
 *--------------------------------------------------------------------*/

#ifndef  TABINDFile_H
#define  TABINDFile_H

#include "tabindnode.h"

class TABINDFile  
{
private:
    char        *m_pszFname;
    FILE        *m_fp;
    TABAccess   m_eAccessMode;

    TABBinBlockManager m_oBlockManager;

    int         m_numIndexes;
    TABINDNode  **m_papoIndexRootNodes;
    UGKByte       **m_papbyKeyBuffers;

    int         ValidateIndexNo(int nIndexNumber);
    int         ReadHeader();
    int         WriteHeader();

public:
	TABINDFile();
	virtual ~TABINDFile();

    int         Open(const char *pszFname, const char *pszAccess, 
                     UGKBool bTestOpenNoError=FALSE);
    int         Close();

    int         GetNumIndexes() {return m_numIndexes;};
    int         SetIndexFieldType(int nIndexNumber, TABFieldType eType);
    int         SetIndexUnique(int nIndexNumber, UGKBool bUnique=TRUE);
    UGKByte      *BuildKey(int nIndexNumber, UGKInt32 nValue);
    UGKByte      *BuildKey(int nIndexNumber, const char *pszStr);
    UGKByte      *BuildKey(int nIndexNumber, double dValue);
    UGKInt32      FindFirst(int nIndexNumber, UGKByte *pKeyValue);
    UGKInt32      FindNext(int nIndexNumber, UGKByte *pKeyValue);

    int         CreateIndex(TABFieldType eType, int nFieldSize);
    int         AddEntry(int nIndexNumber, UGKByte *pKeyValue, UGKInt32 nRecordNo);


    void Dump(FILE *fpOut = NULL);


};

#endif