tabindnode.h

linux下一款GIS程序源码

// tabindnode.h: interface for the TABINDNode class.
//
//////////////////////////////////////////////////////////////////////

#ifndef  TABINDNode_H
#define  TABINDNode_H

#include "ugkglobal.h"
#include "tabbinblockmanager.h"
#include "tabrawbinblock.h"

class TABINDNode  
{
private:
    FILE        *m_fp;
    TABAccess   m_eAccessMode;
    TABINDNode *m_poCurChildNode;
    TABINDNode *m_poParentNodeRef;

    TABBinBlockManager *m_poBlockManagerRef;

    int         m_nSubTreeDepth;
    int         m_nKeyLength;
    TABFieldType m_eFieldType;
    UGKBool       m_bUnique;

    UGKInt32      m_nCurDataBlockPtr;
    int         m_nCurIndexEntry;
    TABRawBinBlock *m_poDataBlock;
    int         m_numEntriesInNode;
    UGKInt32      m_nPrevNodePtr;
    UGKInt32      m_nNextNodePtr;

    int         GotoNodePtr(UGKInt32 nNewNodePtr);
    UGKInt32      ReadIndexEntry(int nEntryNo, UGKByte *pKeyValue);
    int         IndexKeyCmp(UGKByte *pKeyValue, int nEntryNo);

    int         InsertEntry(UGKByte *pKeyValue, UGKInt32 nRecordNo,
                            UGKBool bInsertAfterCurChild=FALSE,
                            UGKBool bMakeNewEntryCurChild=FALSE);
    int         SetNodeBufferDirectly(int numEntries, UGKByte *pBuf,
                                      int nCurIndexEntry=0, 
                                      TABINDNode *poCurChild=NULL);

public:
	TABINDNode(TABAccess eAccessMode = TABRead);
	virtual ~TABINDNode();

    int         InitNode(FILE *fp, int nBlockPtr, 
                         int nKeyLength, int nSubTreeDepth, UGKBool bUnique,
                         TABBinBlockManager *poBlockMgr=NULL,
                         TABINDNode *poParentNode=NULL,
                         int nPrevNodePtr=0, int nNextNodePtr=0);

    int         SetFieldType(TABFieldType eType);
    TABFieldType GetFieldType()         {return m_eFieldType;};

    void        SetUnique(UGKBool bUnique){m_bUnique = bUnique;};
    UGKBool       IsUnique()              {return m_bUnique;};

    int         GetKeyLength()          {return m_nKeyLength;};
    int         GetSubTreeDepth()       {return m_nSubTreeDepth;};
    UGKInt32      GetNodeBlockPtr()       {return m_nCurDataBlockPtr;};
    int         GetNumEntries()         {return m_numEntriesInNode;};
    int         GetMaxNumEntries()      {return (512-12)/(m_nKeyLength+4);};

    UGKInt32      FindFirst(UGKByte *pKeyValue);
    UGKInt32      FindNext(UGKByte *pKeyValue);

	int         CommitToFile();

    int         AddEntry(UGKByte *pKeyValue, UGKInt32 nRecordNo,
                         UGKBool bAddInThisNodeOnly=FALSE,
                         UGKBool bInsertAfterCurChild=FALSE,
                         UGKBool bMakeNewEntryCurChild=FALSE);
    int         SplitNode();
    int         SplitRootNode();
    UGKByte*      GetNodeKey();
    int         UpdateCurChildEntry(UGKByte *pKeyValue, UGKInt32 nRecordNo);
    int         UpdateSplitChild(UGKByte *pKeyValue1, UGKInt32 nRecordNo1,
                                 UGKByte *pKeyValue2, UGKInt32 nRecordNo2,
                                 int nNewCurChildNo /* 1 or 2 */);

    int         SetNodeBlockPtr(UGKInt32 nThisNodePtr);
    int         SetPrevNodePtr(UGKInt32 nPrevNodePtr);
    int         SetNextNodePtr(UGKInt32 nNextNodePtr);

	void Dump(FILE *fpOut = NULL);
};

#endif