sot/source/sdstor/stgavl.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
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   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
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  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef _STGAVL_HXX
  21 #define _STGAVL_HXX
  22
  23 #include <tools/solar.h>
  24
  25 // This class must be overloaded to define real, living nodes.
  26 // Especially, the compare function must be implemented.
  27
  28 class StgAvlNode
  29 {
  30     friend class StgAvlIterator;
  31 private:
  32     short Locate( StgAvlNode*, StgAvlNode**, StgAvlNode**, StgAvlNode** );
  33     short Adjust( StgAvlNode**, StgAvlNode* );
  34     StgAvlNode* RotLL();
  35     StgAvlNode* RotLR();
  36     StgAvlNode* RotRR();
  37     StgAvlNode* RotRL();
  38     void   StgEnum( short& );
  39     static StgAvlNode* Rem( StgAvlNode**, StgAvlNode*, sal_Bool );
  40 protected:
  41     short nId;                          // iterator ID
  42     short nBalance;                     // indicates tree balance
  43     StgAvlNode* pLeft, *pRight;         // leaves
  44     StgAvlNode();
  45 public:
  46     virtual ~StgAvlNode();
  47     StgAvlNode* Find( StgAvlNode* );
  48     static sal_Bool Insert( StgAvlNode**, StgAvlNode* );
  49     static sal_Bool Remove( StgAvlNode**, StgAvlNode*, sal_Bool bDel = sal_True );
  50     static sal_Bool Move( StgAvlNode**, StgAvlNode**, StgAvlNode* );
  51     virtual short Compare( const StgAvlNode* ) const = 0;
  52 };
  53
  54 // The iterator class provides single stepping through an AVL tree.
  55
  56 class StgAvlIterator {
  57     StgAvlNode* pRoot;                  // root entry (parent)
  58     short       nCount;                 // tree size
  59     short       nCur;                   // current element
  60     StgAvlNode* Find( short );
  61 public:
  62     StgAvlIterator( StgAvlNode* );
  63     StgAvlNode* First();
  64     StgAvlNode* Next();
  65 };
  66
  67 #endif
  68
  69 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */