connectivity/source/inc/dbase/DIndexIter.hxx

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  30
  31 #ifndef _CONNECTIVITY_DBASE_INDEXITER_HXX_
  32 #define _CONNECTIVITY_DBASE_INDEXITER_HXX_
  33
  34 #include "file/fcode.hxx"
  35 #include "dbase/DIndex.hxx"
  36 #include "dbase/dindexnode.hxx"
  37
  38 namespace connectivity
  39 {
  40     namespace dbase
  41     {
  42         //==================================================================
  43         // IndexIterator
  44         //==================================================================
  45         class OIndexIterator
  46         {
  47         protected:
  48             file::OBoolOperator*        m_pOperator;
  49             const file::OOperand*       m_pOperand;
  50             ODbaseIndex*                        m_pIndex;
  51             ONDXPagePtr                         m_aRoot,
  52                                     m_aCurLeaf;
  53             USHORT                                      m_nCurNode;
  54
  55         protected:
  56             ULONG Find(BOOL bFirst);
  57             ULONG GetCompare(BOOL bFirst);
  58             ULONG GetLike(BOOL bFirst);
  59             ULONG GetNull(BOOL bFirst);
  60             ULONG GetNotNull(BOOL bFirst);
  61
  62             ONDXKey* GetFirstKey(ONDXPage* pPage,
  63                                 const file::OOperand& rKey);
  64             ONDXKey* GetNextKey();
  65             ODbaseIndex* GetIndex() const {return m_pIndex;}
  66
  67
  68         public:
  69             OIndexIterator(ODbaseIndex* pInd,
  70                             file::OBoolOperator* pOp,
  71                             const file::OOperand* pOper)
  72                 :m_pOperator(pOp)
  73                 ,m_pOperand(pOper)
  74                 ,m_pIndex(pInd)
  75                 ,m_nCurNode(NODE_NOTFOUND)
  76             {
  77                 pInd->acquire();
  78             }
  79
  80             virtual ~OIndexIterator();
  81             ULONG First();
  82             ULONG Next();
  83
  84         };
  85     }
  86 }
  87 #endif // _CONNECTIVITY_DBASE_INDEXITER_HXX_
  88