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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#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
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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