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//
// LLRBTree.h
// TestTB
//
// Created by Terrin Eager on 7/9/12.
//
// based on rbtree.h but converted to C++
// ll from http://www.cs.princeton.edu/~rs/talks/LLRB/RedBlack.pdf
#ifndef __TestTB__LLRBTree__
#define __TestTB__LLRBTree__
#include <iostream>
#include "bjtypes.h"
#include <sys/socket.h>
#include "bjstring.h"
#include "bjIPAddr.h"
template <class KeyType>
class CRBNode
{
public:
CRBNode() {m_bIsRed = true; m_rbLeft = m_rbRight = NULL;};
virtual ~CRBNode();
inline virtual BJ_COMPARE Compare(KeyType* pKey) = 0; // Key values are equal
inline virtual void CopyNode(CRBNode* pSource) = 0;
inline virtual void Init()=0;
inline virtual void Clear()=0;
CRBNode* GetMinNode();
CRBNode* GetMaxNode();
inline CRBNode* RotateNodeLeft();
inline CRBNode* RotateNodeRight();
CRBNode* AddRecord(CRBNode* pNewRecord);
void FlipColor();
BJ_UINT64 GetCount();
CRBNode* Fixup();
CRBNode* MoveRedLeft();
CRBNode* MoveRedRight();
void CallBack(int(*callback)(const void*, const void*),void* pParam);
bool m_bIsRed;
//protected:
KeyType m_Key;
CRBNode* m_rbLeft;
CRBNode* m_rbRight;
};
template <class KeyType, class NodeType>
class CLLRBTree
{
public:
CLLRBTree();
virtual ~CLLRBTree() { if (m_Root) delete m_Root;};
NodeType* Find(KeyType* pKey);
NodeType* FindwithAddRecord(KeyType* pKey);
NodeType* AddRecord(KeyType* pKey);
void RemoveRecord(KeyType* pKey);
NodeType* GetRoot() { return m_Root;};
void ClearAll() { delete m_Root; m_Root = NULL;};
BJ_UINT64 GetCount();
NodeType* GetMinNode();
NodeType* GetMaxNode();
NodeType* deleteMin(NodeType* pRecord);
private:
NodeType* RemoveRecord(NodeType* pRecord,KeyType* pKey);
virtual NodeType* newNode(KeyType* pKey) { return new NodeType(pKey);}
virtual void freeNode(NodeType * pNode){ delete pNode;};
NodeType* m_Root;
};
/////////////////
template<class KeyType>
CRBNode<KeyType>::~CRBNode()
{
if (m_rbLeft)
delete m_rbLeft;
if (m_rbRight)
delete m_rbRight;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::RotateNodeLeft()
{
CRBNode<KeyType>* pTemp = m_rbRight;
m_rbRight = pTemp->m_rbLeft;
pTemp->m_rbLeft = this;
pTemp->m_bIsRed = pTemp->m_rbLeft->m_bIsRed;
pTemp->m_rbLeft->m_bIsRed = 1;
return pTemp;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::RotateNodeRight()
{
CRBNode<KeyType>* pTemp = m_rbLeft;
m_rbLeft = pTemp->m_rbRight;
pTemp->m_rbRight = this;
pTemp->m_bIsRed = pTemp->m_rbRight->m_bIsRed;
pTemp->m_rbRight->m_bIsRed = 1;
return pTemp;
}
template<class KeyType>
BJ_UINT64 CRBNode<KeyType>::GetCount()
{
BJ_UINT64 Num = 1;
if (m_rbLeft)
Num += m_rbLeft->GetCount();
if (m_rbRight)
Num += m_rbRight->GetCount();
return Num;
}
template<class KeyType>
void CRBNode<KeyType>::FlipColor()
{
m_bIsRed = !m_bIsRed;
if (m_rbLeft)
m_rbLeft->m_bIsRed = !m_rbLeft->m_bIsRed;
if (m_rbRight)
m_rbRight->m_bIsRed = !m_rbRight->m_bIsRed;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::Fixup()
{
// fix the tree balance
CRBNode<KeyType>* pNode = this;
if (m_rbRight && m_rbRight->m_bIsRed) // fix right leaning reds on the way up
pNode = RotateNodeLeft();
if (pNode && pNode->m_rbLeft && pNode->m_rbLeft->m_bIsRed && pNode->m_rbLeft->m_rbLeft && pNode->m_rbLeft->m_rbLeft->m_bIsRed) // fix two reds in a row on the way up
pNode = RotateNodeRight();
if (pNode && pNode->m_rbRight && pNode->m_rbRight->m_bIsRed && pNode->m_rbLeft && pNode->m_rbLeft->m_bIsRed) //split 4-nodes on the way up
pNode->FlipColor();
return pNode;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::MoveRedLeft()
{
CRBNode* pNode = this;
FlipColor();
if (m_rbRight && m_rbRight->m_rbLeft && m_rbRight->m_rbLeft->m_bIsRed)
{
m_rbRight = m_rbRight->RotateNodeRight();
pNode = RotateNodeLeft();
if (pNode)
pNode->FlipColor();
}
return pNode;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::MoveRedRight()
{
CRBNode* pNode = this;
FlipColor();
if (m_rbLeft && m_rbLeft->m_rbLeft && m_rbLeft->m_rbLeft->m_bIsRed)
{
pNode = RotateNodeRight();
if (pNode)
pNode->FlipColor();
}
return pNode;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::AddRecord(CRBNode* pNewRecord)
{
switch (Compare(&pNewRecord->m_Key))
{
case BJ_GT:
if (m_rbRight)
m_rbRight = m_rbRight->AddRecord(pNewRecord);
else
m_rbRight = pNewRecord;
break;
case BJ_LT:
if (m_rbLeft)
m_rbLeft = m_rbLeft->AddRecord(pNewRecord);
else
m_rbLeft = pNewRecord;
break;
default: // equal
pNewRecord->m_bIsRed = false;
pNewRecord->m_rbLeft = m_rbLeft;
m_rbLeft = pNewRecord;
return this;
};
// fix the tree balance
CRBNode* pRecord = this;
// fix the tree balance
if (pRecord && pRecord->m_rbRight && pRecord->m_rbRight->m_bIsRed) // fix right leaning reds on the way up
pRecord = pRecord->RotateNodeLeft();
if (pRecord && pRecord->m_rbLeft && pRecord->m_rbLeft->m_bIsRed && pRecord->m_rbLeft->m_rbLeft && pRecord->m_rbLeft->m_rbLeft->m_bIsRed) // fix two reds in a row on the way up
pRecord = pRecord->RotateNodeRight();
if (pRecord && pRecord->m_rbRight && pRecord->m_rbRight->m_bIsRed && pRecord->m_rbLeft && pRecord->m_rbLeft->m_bIsRed) //split 4-nodes on the way up
pRecord->FlipColor();
return pRecord;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::GetMinNode()
{
CRBNode* pRecord = this;
while (pRecord && pRecord->m_rbLeft)
pRecord = pRecord->m_rbLeft;
return pRecord;
}
template<class KeyType>
CRBNode<KeyType>* CRBNode<KeyType>::GetMaxNode()
{
CRBNode* pRecord = this;
while (pRecord && pRecord->m_rbRight)
pRecord = pRecord->m_rbRight;
return pRecord;
}
template<class KeyType>
void CRBNode<KeyType>::CallBack(int(*callback)(const void*, const void*),void* pParam)
{
if (m_rbLeft)
m_rbLeft->CallBack(callback,pParam);
callback(this,pParam);
if (m_rbRight)
m_rbRight->CallBack(callback,pParam);
}
///////////
template<class KeyType,class NodeType>
CLLRBTree<KeyType,NodeType>::CLLRBTree()
{
m_Root = NULL;
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::Find(KeyType* pKey)
{
CRBNode<KeyType>* pNode = m_Root;
while (pNode)
{
switch (pNode->Compare(pKey))
{
case BJ_GT:
pNode = pNode->m_rbRight;
break;
case BJ_LT:
pNode = pNode->m_rbLeft;
break;
default:
return (NodeType*)pNode;
break;
}
}
return NULL;
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::AddRecord(KeyType* pKey)
{
NodeType* pRecord = newNode(pKey);
if (m_Root)
m_Root = (NodeType*) m_Root->AddRecord(pRecord);
else
m_Root = pRecord;
if (m_Root)
m_Root->m_bIsRed = false;
return pRecord;
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::FindwithAddRecord(KeyType* pKey)
{
NodeType* pRecord = NULL;
pRecord = Find(pKey);
if (pRecord == NULL)
pRecord = AddRecord(pKey);
return pRecord;
}
template<class KeyType,class NodeType>
void CLLRBTree<KeyType,NodeType>::RemoveRecord(KeyType* pKey)
{
m_Root = RemoveRecord(m_Root,pKey);
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::deleteMin(NodeType* pRecord)
{
if (pRecord->m_rbLeft == NULL)
{
freeNode(pRecord);
return NULL;
}
if (!(pRecord->m_rbLeft && pRecord->m_rbLeft->m_bIsRed) && !(pRecord->m_rbLeft && pRecord->m_rbLeft->m_rbLeft &&pRecord->m_rbLeft->m_rbLeft->m_bIsRed))
pRecord = (NodeType*)pRecord->MoveRedLeft();
pRecord->m_rbLeft = deleteMin((NodeType*)pRecord->m_rbLeft);
return (NodeType*)pRecord->Fixup();
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::RemoveRecord(NodeType* pRecord,KeyType* pKey)
{
NodeType* pTempRecord = NULL;
if (pRecord == NULL)
return NULL;
if (pRecord->Compare(pKey) == BJ_LT)
{
if (!(pRecord->m_rbLeft &&pRecord->m_rbLeft->m_bIsRed) && !(pRecord->m_rbLeft && pRecord->m_rbLeft->m_rbLeft &&pRecord->m_rbLeft->m_rbLeft->m_bIsRed))
pRecord->MoveRedLeft();
pRecord = RemoveRecord((NodeType*)pRecord->m_rbLeft, pKey);
}
else
{
if (pRecord->m_rbLeft &&pRecord->m_rbLeft->m_bIsRed)
pRecord->RotateNodeRight();
if(pRecord->Compare(pKey) == BJ_EQUAL && pRecord->m_rbRight == NULL)
{
freeNode(pRecord);
return NULL;
}
if (!(pRecord->m_rbRight && pRecord->m_rbRight->m_bIsRed) && !(pRecord->m_rbRight && pRecord->m_rbRight->m_rbLeft && pRecord->m_rbRight->m_rbLeft->m_bIsRed))
pRecord = (NodeType*)pRecord->MoveRedRight();
if (pRecord->Compare(pKey) == BJ_EQUAL)
{
pTempRecord = (NodeType*)pRecord->GetMinNode();
pRecord->CopyNode(pTempRecord);
pRecord->m_rbRight = deleteMin((NodeType*)pRecord->m_rbRight);
}
else
{
pRecord->m_rbRight = RemoveRecord((NodeType*)pRecord->m_rbRight, pKey);
}
}
return pRecord?(NodeType*)pRecord->Fixup():NULL;
}
template<class KeyType,class NodeType>
BJ_UINT64 CLLRBTree<KeyType,NodeType>::GetCount()
{
if (m_Root)
return m_Root->GetCount();
else
return 0;
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::GetMinNode()
{
if (m_Root)
return m_Root->GetMinNode();
else
return NULL;
}
template<class KeyType,class NodeType>
NodeType* CLLRBTree<KeyType,NodeType>::GetMaxNode()
{
if (m_Root)
return m_Root->GetMaxNode();
else
return NULL;
}
#endif /* defined(__TestTB__LLRBTree__) */
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