sot/source/sdstor/stgavl.hxx

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  19
  20 #ifndef INCLUDED_SOT_SOURCE_SDSTOR_STGAVL_HXX
  21 #define INCLUDED_SOT_SOURCE_SDSTOR_STGAVL_HXX
  22
  23 #include <sal/types.h>
  24
  25 // This is an abstract base class for nodes.
  26 // Especially, the compare function must be implemented.
  27
  28 class StgAvlNode
  29 {
  30     friend class StgAvlIterator;
  31 private:
  32     sal_Int32 Locate( StgAvlNode const *, StgAvlNode**, StgAvlNode**, StgAvlNode** );
  33     short Adjust( StgAvlNode**, StgAvlNode const * );
  34     StgAvlNode* RotLL();
  35     StgAvlNode* RotLR();
  36     StgAvlNode* RotRR();
  37     StgAvlNode* RotRL();
  38     void   StgEnum( short& );
  39     static StgAvlNode* Rem( StgAvlNode**, StgAvlNode*, bool );
  40 protected:
  41     short m_nId;                          // iterator ID
  42     short m_nBalance;                     // indicates tree balance
  43     StgAvlNode* m_pLeft, *m_pRight;         // leaves
  44     StgAvlNode();
  45 public:
  46     virtual ~StgAvlNode();
  47     StgAvlNode* Find( StgAvlNode const * );
  48     static bool Insert( StgAvlNode**, StgAvlNode* );
  49     static bool Remove( StgAvlNode**, StgAvlNode*, bool bDel );
  50     virtual sal_Int32 Compare( const StgAvlNode* ) const = 0;
  51 };
  52
  53 // The iterator class provides single stepping through an AVL tree.
  54
  55 class StgAvlIterator {
  56     StgAvlNode* m_pRoot;                  // root entry (parent)
  57     short       m_nCur;                   // current element
  58     StgAvlNode* Find( short );
  59 public:
  60     explicit StgAvlIterator( StgAvlNode* );
  61     StgAvlNode* First();
  62     StgAvlNode* Next();
  63 };
  64
  65 #endif
  66
  67 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */