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/*
dbx_tree: tree database driver for Miranda IM
Copyright 2007-2010 Michael "Protogenes" Kunz,
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#pragma once
#include "BTree.h"
#include "BlockManager.h"
#include "Logger.h"
template <typename TKey, uint16_t SizeParam = 4>
class CFileBTree : public CBTree<TKey, SizeParam>
{
private:
protected:
CBlockManager & m_BlockManager;
uint16_t cSignature;
virtual void PrepareInsertOperation();
virtual TNode * CreateNewNode(TNodeRef & NodeRef);
virtual void DeleteNode(TNodeRef Node);
virtual TNode * Read(TNodeRef Node);
virtual void Write(TNodeRef Node);
public:
CFileBTree(CBlockManager & BlockManager, typename CBTree<TKey, SizeParam>::TNodeRef RootNode, uint16_t Signature);
virtual ~CFileBTree();
};
template <typename TKey, uint16_t SizeParam>
CFileBTree<TKey, SizeParam>::CFileBTree(CBlockManager & BlockManager, typename CBTree<TKey, SizeParam>::TNodeRef RootNode, uint16_t Signature)
: CBTree<TKey, SizeParam>::CBTree(RootNode),
m_BlockManager(BlockManager)
{
cSignature = Signature;
CBTree<TKey, SizeParam>::m_DestroyTree = false;
}
template <typename TKey, uint16_t SizeParam>
CFileBTree<TKey, SizeParam>::~CFileBTree()
{
CBTree<TKey, SizeParam>::m_DestroyTree = false;
}
template <typename TKey, uint16_t SizeParam>
void CFileBTree<TKey, SizeParam>::PrepareInsertOperation()
{
}
template <typename TKey, uint16_t SizeParam>
typename CBTree<TKey, SizeParam>::TNode * CFileBTree<TKey, SizeParam>::CreateNewNode(typename CBTree<TKey, SizeParam>::TNodeRef & NodeRef)
{
return reinterpret_cast<TNode*>( m_BlockManager.CreateBlock<uint32_t>(NodeRef, cSignature << 16, sizeof(typename CBTree<TKey, SizeParam>::TNode) - 4) - 1);
}
template <typename TKey, uint16_t SizeParam>
void CFileBTree<TKey, SizeParam>::DeleteNode(typename CBTree<TKey, SizeParam>::TNodeRef Node)
{
m_BlockManager.DeleteBlock(Node);
}
template <typename TKey, uint16_t SizeParam>
typename CBTree<TKey, SizeParam>::TNode * CFileBTree<TKey, SizeParam>::Read(typename CBTree<TKey, SizeParam>::TNodeRef Node)
{
uint32_t sig = 0;
uint32_t size = 0;
TNode * res = reinterpret_cast<TNode*>( m_BlockManager.ReadBlock<uint32_t>(Node, size, sig) - 1); /// HACK using knowledge about the blockmanager here
CHECK(res->Signature == cSignature,
logCRITICAL, _T("Signature check failed"));
return res;
}
template <typename TKey, uint16_t SizeParam>
void CFileBTree<TKey, SizeParam>::Write(typename CBTree<TKey, SizeParam>::TNodeRef Node)
{
m_BlockManager.UpdateBlock(Node, 0);
}
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