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*
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*
* Licensed to the Apache Software Foundation (ASF) under one or more
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#ifndef INCLUDED_SOT_SOURCE_SDSTOR_STGAVL_HXX
#define INCLUDED_SOT_SOURCE_SDSTOR_STGAVL_HXX
#include <sal/types.h>
// This is an abstract base class for nodes.
// Especially, the compare function must be implemented.
class StgAvlNode
{
friend class StgAvlIterator;
private:
sal_Int32 Locate( StgAvlNode
const *, StgAvlNode**, StgAvlNode**, StgAvlNode** );
short Adjust( StgAvlNode**, StgAvlNode
const * );
StgAvlNode* RotLL();
StgAvlNode* RotLR();
StgAvlNode* RotRR();
StgAvlNode* RotRL();
void StgEnum(
short& );
static StgAvlNode* Rem( StgAvlNode**, StgAvlNode*,
bool );
protected:
short m_nId;
// iterator ID
short m_nBalance;
// indicates tree balance
StgAvlNode* m_pLeft, *m_pRight;
// leaves
StgAvlNode();
public:
virtual ~StgAvlNode();
StgAvlNode* Find( StgAvlNode
const * );
static bool Insert( StgAvlNode**, StgAvlNode* );
static bool Remove( StgAvlNode**, StgAvlNode*,
bool bDel );
virtual sal_Int32 Compare(
const StgAvlNode* )
const = 0;
};
// The iterator class provides single stepping through an AVL tree.
class StgAvlIterator {
StgAvlNode* m_pRoot;
// root entry (parent)
short m_nCur;
// current element
StgAvlNode* Find(
short );
public:
explicit StgAvlIterator( StgAvlNode* );
StgAvlNode* First();
StgAvlNode* Next();
};
#endif
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