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