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TEMPLDEF.PAK
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MAP_S.CTT
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/////////////////////////////////////////////////////////////////////////////
// class CMapStringTo - a mapping from CStrings to 'VALUE's.
// passed in parameters as ARG_TYPE
//
// optional definitions:
// IS_SERIAL - enable serialization through CArchive extraction & insertion
// HAS_CREATE - call constructors and destructors
//
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
/////////////////////////////////////////////////////////////////////////////
//$DECLARE_TEMPLATE
/////////////////////////////////////////////////////////////////////////////
template<class VALUE, class ARG_VALUE>
class CMapStringTo : public CObject
{
$ifdef IS_SERIAL
DECLARE_SERIAL(CMapStringTo)
$else
DECLARE_DYNAMIC(CMapStringTo)
$endif //!IS_SERIAL
protected:
// Association
struct CAssoc
{
CAssoc* pNext;
UINT nHashValue; // needed for efficient iteration
CString key;
VALUE value;
};
public:
// Construction
CMapStringTo(int nBlockSize = 10);
// Attributes
// number of elements
int GetCount() const;
BOOL IsEmpty() const;
// Lookup
BOOL Lookup(LPCTSTR key, VALUE& rValue) const;
BOOL LookupKey(LPCTSTR key, LPCTSTR& rKey) const;
// Operations
// Lookup and add if not there
VALUE& operator[](LPCTSTR key);
// add a new (key, value) pair
void SetAt(LPCTSTR key, ARG_VALUE newValue);
// removing existing (key, ?) pair
BOOL RemoveKey(LPCTSTR key);
void RemoveAll();
// iterating all (key, value) pairs
POSITION GetStartPosition() const;
void GetNextAssoc(POSITION& rNextPosition, CString& rKey, VALUE& rValue) const;
// advanced features for derived classes
UINT GetHashTableSize() const;
void InitHashTable(UINT hashSize, BOOL bAllocNow = TRUE);
// Overridables: special non-virtual (see map implementation for details)
// Routine used to user-provided hash keys
UINT HashKey(LPCTSTR key) const;
// Implementation
protected:
CAssoc** m_pHashTable;
UINT m_nHashTableSize;
int m_nCount;
CAssoc* m_pFreeList;
struct CPlex* m_pBlocks;
int m_nBlockSize;
CAssoc* NewAssoc();
void FreeAssoc(CAssoc*);
CAssoc* GetAssocAt(LPCTSTR, UINT&) const;
public:
~CMapStringTo();
$ifdef IS_SERIAL
void Serialize(CArchive&);
$endif //IS_SERIAL
#ifdef _DEBUG
void Dump(CDumpContext&) const;
void AssertValid() const;
#endif
protected:
// local typedefs for CTypedPtrMap class template
typedef CString BASE_KEY;
typedef LPCTSTR BASE_ARG_KEY;
typedef VALUE BASE_VALUE;
typedef ARG_VALUE BASE_ARG_VALUE;
};
//$IMPLEMENT_TEMPLATE_INLINES
////////////////////////////////////////////////////////////////////////////
template<class VALUE, class ARG_VALUE>
_AFXCOLL_INLINE int CMapStringTo<VALUE, ARG_VALUE>::GetCount() const
{ return m_nCount; }
template<class VALUE, class ARG_VALUE>
_AFXCOLL_INLINE BOOL CMapStringTo<VALUE, ARG_VALUE>::IsEmpty() const
{ return m_nCount == 0; }
template<class VALUE, class ARG_VALUE>
_AFXCOLL_INLINE void CMapStringTo<VALUE, ARG_VALUE>::SetAt(LPCTSTR key, ARG_VALUE newValue)
{ (*this)[key] = newValue; }
template<class VALUE, class ARG_VALUE>
_AFXCOLL_INLINE POSITION CMapStringTo<VALUE, ARG_VALUE>::GetStartPosition() const
{ return (m_nCount == 0) ? NULL : BEFORE_START_POSITION; }
template<class VALUE, class ARG_VALUE>
_AFXCOLL_INLINE UINT CMapStringTo<VALUE, ARG_VALUE>::GetHashTableSize() const
{ return m_nHashTableSize; }
//$IMPLEMENT_TEMPLATE
// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1995 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.
/////////////////////////////////////////////////////////////////////////////
//
// Implementation of parmeterized Map from CString to value
//
/////////////////////////////////////////////////////////////////////////////
#include "stdafx.h"
#ifdef AFX_COLL2_SEG
#pragma code_seg(AFX_COLL2_SEG)
#endif
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
$ifdef HAS_CREATE
#include "elements.h" // used for special creation
$endif
#define new DEBUG_NEW
/////////////////////////////////////////////////////////////////////////////
template<class VALUE, class ARG_VALUE>
CMapStringTo<VALUE, ARG_VALUE>::CMapStringTo(int nBlockSize)
{
ASSERT(nBlockSize > 0);
m_pHashTable = NULL;
m_nHashTableSize = 17; // default size
m_nCount = 0;
m_pFreeList = NULL;
m_pBlocks = NULL;
m_nBlockSize = nBlockSize;
}
template<class VALUE, class ARG_VALUE>
inline UINT CMapStringTo<VALUE, ARG_VALUE>::HashKey(LPCTSTR key) const
{
UINT nHash = 0;
while (*key)
nHash = (nHash<<5) + nHash + *key++;
return nHash;
}
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::InitHashTable(
UINT nHashSize, BOOL bAllocNow)
//
// Used to force allocation of a hash table or to override the default
// hash table size of (which is fairly small)
{
ASSERT_VALID(this);
ASSERT(m_nCount == 0);
ASSERT(nHashSize > 0);
if (m_pHashTable != NULL)
{
// free hash table
delete[] m_pHashTable;
m_pHashTable = NULL;
}
if (bAllocNow)
{
m_pHashTable = new CAssoc* [nHashSize];
memset(m_pHashTable, 0, sizeof(CAssoc*) * nHashSize);
}
m_nHashTableSize = nHashSize;
}
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::RemoveAll()
{
ASSERT_VALID(this);
if (m_pHashTable != NULL)
{
// destroy elements
for (UINT nHash = 0; nHash < m_nHashTableSize; nHash++)
{
CAssoc* pAssoc;
for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL;
pAssoc = pAssoc->pNext)
{
pAssoc->key.Empty(); // free up string data
$ifdef HAS_CREATE
DestructElement(&pAssoc->value);
$endif
}
}
// free hash table
delete [] m_pHashTable;
m_pHashTable = NULL;
}
m_nCount = 0;
m_pFreeList = NULL;
m_pBlocks->FreeDataChain();
m_pBlocks = NULL;
}
template<class VALUE, class ARG_VALUE>
CMapStringTo<VALUE, ARG_VALUE>::~CMapStringTo()
{
RemoveAll();
ASSERT(m_nCount == 0);
}
/////////////////////////////////////////////////////////////////////////////
// Assoc helpers
// same as CList implementation except we store CAssoc's not CNode's
// and CAssoc's are singly linked all the time
template<class VALUE, class ARG_VALUE>
CMapStringTo<VALUE, ARG_VALUE>::CAssoc*
CMapStringTo<VALUE, ARG_VALUE>::NewAssoc()
{
if (m_pFreeList == NULL)
{
// add another block
CPlex* newBlock = CPlex::Create(m_pBlocks, m_nBlockSize,
sizeof(CMapStringTo::CAssoc));
// chain them into free list
CMapStringTo::CAssoc* pAssoc =
(CMapStringTo::CAssoc*) newBlock->data();
// free in reverse order to make it easier to debug
pAssoc += m_nBlockSize - 1;
for (int i = m_nBlockSize-1; i >= 0; i--, pAssoc--)
{
pAssoc->pNext = m_pFreeList;
m_pFreeList = pAssoc;
}
}
ASSERT(m_pFreeList != NULL); // we must have something
CMapStringTo::CAssoc* pAssoc = m_pFreeList;
m_pFreeList = m_pFreeList->pNext;
m_nCount++;
ASSERT(m_nCount > 0); // make sure we don't overflow
memcpy(&pAssoc->key, &afxEmptyString, sizeof(CString));
$ifdef HAS_CREATE
ConstructElement(&pAssoc->value);
$endif
$ifdef USE_MEMSET
memset(&pAssoc->value, 0, sizeof(VALUE));
$endif
$ifdef USE_ASSIGN
pAssoc->value = 0;
$endif
return pAssoc;
}
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::FreeAssoc(CMapStringTo::CAssoc* pAssoc)
{
pAssoc->key.Empty(); // free up string data
$ifdef HAS_CREATE
DestructElement(&pAssoc->value);
$endif
pAssoc->pNext = m_pFreeList;
m_pFreeList = pAssoc;
m_nCount--;
ASSERT(m_nCount >= 0); // make sure we don't underflow
// if no more elements, cleanup completely
if (m_nCount == 0)
RemoveAll();
}
template<class VALUE, class ARG_VALUE>
CMapStringTo<VALUE, ARG_VALUE>::CAssoc*
CMapStringTo<VALUE, ARG_VALUE>::GetAssocAt(LPCTSTR key, UINT& nHash) const
// find association (or return NULL)
{
nHash = HashKey(key) % m_nHashTableSize;
if (m_pHashTable == NULL)
return NULL;
// see if it exists
CAssoc* pAssoc;
for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL; pAssoc = pAssoc->pNext)
{
if (pAssoc->key == key)
return pAssoc;
}
return NULL;
}
/////////////////////////////////////////////////////////////////////////////
template<class VALUE, class ARG_VALUE>
BOOL CMapStringTo<VALUE, ARG_VALUE>::Lookup(LPCTSTR key, VALUE& rValue) const
{
ASSERT_VALID(this);
UINT nHash;
CAssoc* pAssoc = GetAssocAt(key, nHash);
if (pAssoc == NULL)
return FALSE; // not in map
rValue = pAssoc->value;
return TRUE;
}
template<class VALUE, class ARG_VALUE>
BOOL CMapStringTo<VALUE, ARG_VALUE>::LookupKey(LPCTSTR key, LPCTSTR& rKey) const
{
ASSERT_VALID(this);
UINT nHash;
CAssoc* pAssoc = GetAssocAt(key, nHash);
if (pAssoc == NULL)
return FALSE; // not in map
rKey = pAssoc->key;
return TRUE;
}
template<class VALUE, class ARG_VALUE>
VALUE& CMapStringTo<VALUE, ARG_VALUE>::operator[](LPCTSTR key)
{
ASSERT_VALID(this);
UINT nHash;
CAssoc* pAssoc;
if ((pAssoc = GetAssocAt(key, nHash)) == NULL)
{
if (m_pHashTable == NULL)
InitHashTable(m_nHashTableSize);
// it doesn't exist, add a new Association
pAssoc = NewAssoc();
pAssoc->nHashValue = nHash;
pAssoc->key = key;
// 'pAssoc->value' is a constructed object, nothing more
// put into hash table
pAssoc->pNext = m_pHashTable[nHash];
m_pHashTable[nHash] = pAssoc;
}
return pAssoc->value; // return new reference
}
template<class VALUE, class ARG_VALUE>
BOOL CMapStringTo<VALUE, ARG_VALUE>::RemoveKey(LPCTSTR key)
// remove key - return TRUE if removed
{
ASSERT_VALID(this);
if (m_pHashTable == NULL)
return FALSE; // nothing in the table
CAssoc** ppAssocPrev;
ppAssocPrev = &m_pHashTable[HashKey(key) % m_nHashTableSize];
CAssoc* pAssoc;
for (pAssoc = *ppAssocPrev; pAssoc != NULL; pAssoc = pAssoc->pNext)
{
if (pAssoc->key == key)
{
// remove it
*ppAssocPrev = pAssoc->pNext; // remove from list
FreeAssoc(pAssoc);
return TRUE;
}
ppAssocPrev = &pAssoc->pNext;
}
return FALSE; // not found
}
/////////////////////////////////////////////////////////////////////////////
// Iterating
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::GetNextAssoc(POSITION& rNextPosition,
CString& rKey, VALUE& rValue) const
{
ASSERT_VALID(this);
ASSERT(m_pHashTable != NULL); // never call on empty map
CAssoc* pAssocRet = (CAssoc*)rNextPosition;
ASSERT(pAssocRet != NULL);
if (pAssocRet == (CAssoc*) BEFORE_START_POSITION)
{
// find the first association
for (UINT nBucket = 0; nBucket < m_nHashTableSize; nBucket++)
if ((pAssocRet = m_pHashTable[nBucket]) != NULL)
break;
ASSERT(pAssocRet != NULL); // must find something
}
// find next association
ASSERT(AfxIsValidAddress(pAssocRet, sizeof(CAssoc)));
CAssoc* pAssocNext;
if ((pAssocNext = pAssocRet->pNext) == NULL)
{
// go to next bucket
for (UINT nBucket = pAssocRet->nHashValue + 1;
nBucket < m_nHashTableSize; nBucket++)
if ((pAssocNext = m_pHashTable[nBucket]) != NULL)
break;
}
rNextPosition = (POSITION) pAssocNext;
// fill in return data
rKey = pAssocRet->key;
rValue = pAssocRet->value;
}
$ifdef IS_SERIAL
/////////////////////////////////////////////////////////////////////////////
// Serialization
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::Serialize(CArchive& ar)
{
ASSERT_VALID(this);
CObject::Serialize(ar);
if (ar.IsStoring())
{
ar.WriteCount(m_nCount);
if (m_nCount == 0)
return; // nothing more to do
ASSERT(m_pHashTable != NULL);
for (UINT nHash = 0; nHash < m_nHashTableSize; nHash++)
{
CAssoc* pAssoc;
for (pAssoc = m_pHashTable[nHash]; pAssoc != NULL;
pAssoc = pAssoc->pNext)
{
ar << pAssoc->key;
ar << pAssoc->value;
}
}
}
else
{
DWORD nNewCount = ar.ReadCount();
CString newKey;
VALUE newValue;
while (nNewCount--)
{
ar >> newKey;
ar >> newValue;
SetAt(newKey, newValue);
}
}
}
$endif //IS_SERIAL
/////////////////////////////////////////////////////////////////////////////
// Diagnostics
#ifdef _DEBUG
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::Dump(CDumpContext& dc) const
{
CObject::Dump(dc);
dc << "with " << m_nCount << " elements";
if (dc.GetDepth() > 0)
{
// Dump in format "[key] -> value"
CString key;
VALUE val;
POSITION pos = GetStartPosition();
while (pos != NULL)
{
GetNextAssoc(pos, key, val);
dc << "\n\t[" << key << "] = " << val;
}
}
dc << "\n";
}
template<class VALUE, class ARG_VALUE>
void CMapStringTo<VALUE, ARG_VALUE>::AssertValid() const
{
CObject::AssertValid();
ASSERT(m_nHashTableSize > 0);
ASSERT(m_nCount == 0 || m_pHashTable != NULL);
// non-empty map should have hash table
}
#endif //_DEBUG
#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif
$ifdef IS_SERIAL
IMPLEMENT_SERIAL(CMapStringTo, CObject, 0)
$else
IMPLEMENT_DYNAMIC(CMapStringTo, CObject)
$endif //!IS_SERIAL
/////////////////////////////////////////////////////////////////////////////