ref: dee2a30577c55659b1deaa59078f5f1380e0fbe4
dir: /wingui/Listobj.cpp/
// list class
// Copyright 1999, Torsten Landmann
// successfully compiled and tested under MSVC 6.0
//
//////////////////////////////////////////////////////
#include "stdafx.h"
#include "Listobj.h"
// definitions for class CBListReader
CBListReader::CBListReader(CBList &oList)
{
m_poList=&oList;
m_hRead=oList.BeginRead();
m_piUsageStack=new int;
*m_piUsageStack=1;
}
CBListReader::CBListReader(const CBListReader &oSource):
m_piUsageStack(0)
{
*this=oSource;
}
CBListReader::~CBListReader()
{
AbandonCurrentContent();
}
CBListReader& CBListReader::operator=(const CBListReader &oRight)
{
if (this==&oRight) return *this;
AbandonCurrentContent();
m_poList=oRight.m_poList;
m_hRead=oRight.m_hRead;
m_piUsageStack=oRight.m_piUsageStack;
if (m_piUsageStack!=0) *m_piUsageStack++;
return *this;
}
CBListReader::CBListReader(CBList *poList, HRead hRead):
m_poList(poList), m_hRead(hRead)
{
m_piUsageStack=new int;
*m_piUsageStack=1;
}
void CBListReader::AbandonCurrentContent()
{
if (m_piUsageStack!=0)
{
(*m_piUsageStack)--;
if (*m_piUsageStack==0)
{
// last copy of this reader destroyed
m_poList->EndRead(m_hRead);
delete m_piUsageStack;
m_piUsageStack=0;
}
}
}
// ----------- definitions for CBBaseElem ---------
CBBaseElem::CBBaseElem()
{
lIndex=0;
pNext=0;
pPrevious=0;
}
CBBaseElem::~CBBaseElem()
{
}
signed long CBBaseElem::IsHigher(class CBBaseElem *pElem)
{
if (lIndex>pElem->GetIndex())
{
return(1);
}
else
{
if (lIndex<pElem->GetIndex())
{
return(-1);
}
else
{
return(0);
}
}
}
bool CBBaseElem::PutToArchive(CArchive &oArchive, long lSaveParams) const
{
oArchive << lIndex;
return true;
}
bool CBBaseElem::GetFromArchive(CArchive &oArchive, long lLoadParams)
{
oArchive >> lIndex;
return true;
}
// ------ definitions for CBList ---------
CBList::CBList()
{
pFirst=0; pLast=0;
lCurrentIndex=1;
SortBeforeReading=false;
long lCount;
for (lCount=lMaxNumRS-1; lCount>=0; lCount--)
{
bReadEntryUsed[lCount]=false;
}
lNumOfOpenReadingSessions=0;
}
CBList::~CBList()
{
if (pFirst!=0)
{
DeleteAll();
}
}
TBListErr CBList::DeleteAll()
{
if (lNumOfOpenReadingSessions>0)
{
#ifdef _DEBUG
// release an error even in encapsulated code
// (OCX controls and so on)
char *pTest=0;
char szTest=*pTest;
#endif
return siListErr;
}
PBBaseElem pCurrent=pFirst, pDummy;
while (pCurrent!=0)
{
pDummy=pCurrent->pNext;
OnPreDeleteItem(pCurrent); // inform sub classes of deletion
pCurrent->pNext=0;
delete pCurrent;
pCurrent=pDummy;
}
pFirst=0; pLast=0;
return siListNoErr;
}
signed long CBList::GetSmallestIndex()
// determines the lowest available Index
{
long lPos=lCurrentIndex+1; // begin search at next element
if (lPos>iMaxNumberOfCBListItems)
{
lPos=1;
}
while (Exists(lPos))
{
if (lPos==lCurrentIndex) // one turn with nothing found?
{
return(siListErr); // return error
}
if (lPos>iMaxNumberOfCBListItems)
{
lPos=1;
}
lPos++;
}
lCurrentIndex=lPos;
return(lPos);
}
PBBaseElem CBList::Add()
{
if (lNumOfOpenReadingSessions>0)
{
#ifdef _DEBUG
// release an error even in encapsulated code
// (OCX controls and so on)
char *pTest=0;
char szTest=*pTest;
#endif
return 0;
}
long lIndex=GetSmallestIndex();
PBBaseElem pElem;
if (lIndex==siListErr)
{
return 0;
}
pElem=CreateElem();
if (pFirst==0) pFirst=pElem;
pElem->pPrevious=pLast;
if (pLast!=0) pElem->pPrevious->pNext=pElem;
pElem->pNext=0;
pLast=pElem;
pElem->lIndex=lIndex;
pElem->pParentList=this;
return pElem;
}
PBBaseElem CBList::Add(long lDesiredIndex)
{
if (lNumOfOpenReadingSessions>0)
{
#ifdef _DEBUG
// release an error even in encapsulated code
// (OCX controls and so on)
char *pTest=0;
char szTest=*pTest;
#endif
return 0;
}
long lIndex=lDesiredIndex;
if (lIndex<1 || lIndex>iMaxNumberOfCBListItems ||
Exists(lIndex))
{
// the desired index can't be used
return Add();
}
PBBaseElem pElem;
pElem=CreateElem();
if (pLast==0) pLast=pElem;
pElem->pNext=pFirst;
if (pFirst!=0) pElem->pNext->pPrevious=pElem;
pElem->pPrevious=0;
pFirst=pElem;
pElem->lIndex=lIndex;
pElem->pParentList=this;
return pElem;
}
bool CBList::OnMapHandle(CBBaseElem *poElem, long lTask, long lHint)
{
// do nothing; return false to avoid a waste of time
return false;
}
// set to true virtual
/*PBBaseElem CBList::CreateElem()
{
PBBaseElem pNewElem=new TBBaseElem;
return pNewElem;
}*/
void CBList::OnPreDeleteItem(PBBaseElem poElem)
{
// do nothing here
}
TBListErr CBList::DeleteElem(long lIndex)
{
if (lNumOfOpenReadingSessions>0)
{
#ifdef _DEBUG
// release an error even in encapsulated code
// (OCX controls and so on)
char *pTest=0;
char szTest=*pTest;
#endif
return siListErr;
}
PBBaseElem pCurrent=pFirst;
while (pCurrent!=0)
{
if (pCurrent->lIndex==lIndex) // current corresponds to searched?
{
OnPreDeleteItem(pCurrent); // inform sub class of deletion
bool bDeleted=false;
if (pCurrent==pFirst) // first Element to be deleted?
{
pFirst=pFirst->pNext;
if (pFirst!=0)
{
pFirst->pPrevious=0;
}
bDeleted=true;
}
if (pCurrent==pLast) // last Element to be deleted?
{
pLast=pLast->pPrevious;
if (pLast!=0)
{
pLast->pNext=0;
}
bDeleted=true;
}
if (!bDeleted)
// neither first nor last element
{
pCurrent->pNext->pPrevious=pCurrent->pPrevious;
pCurrent->pPrevious->pNext=pCurrent->pNext;
}
delete pCurrent;
return siListNoErr;
}
pCurrent=pCurrent->pNext;
}
// if the programm reaches this point the desired element could
// not be found
return siListErr;
}
bool CBList::Exists(long lIndex) const
{
PBBaseElem pCurrent=pFirst;
while (pCurrent!=0)
{
if (pCurrent->lIndex==lIndex) // desired element found?
{
return true;
}
pCurrent=pCurrent->pNext;
}
// if the program reaches this point the desired element could
// not be found
return false;
}
signed long CBList::GetNumber() const
{
PBBaseElem pCurrent=pFirst;
long lNumber=0;
while (pCurrent!=0)
{
lNumber++;
pCurrent=pCurrent->pNext;
}
return lNumber;
}
PBBaseElem CBList::GetElem(long lIndex) const
{
PBBaseElem pCurrent=pFirst;
while (pCurrent!=0)
{
if (pCurrent->lIndex==lIndex)
{
return pCurrent;
}
pCurrent=pCurrent->pNext;
}
// element was not found
return 0;
}
PBBaseElem CBList::GetPos(long lPos) const
{
PBBaseElem pCurrent=pFirst;
while (pCurrent!=0)
{
if (lPos==0)
{
return pCurrent;
}
pCurrent=pCurrent->pNext;
lPos--;
}
return 0;
}
long CBList::GetIndexPos(long lIndex) const
{
long lCurPos=0;
PBBaseElem pCurrent=pFirst;
while (pCurrent!=0)
{
if (pCurrent->GetIndex()==lIndex)
{
return lCurPos;
}
pCurrent=pCurrent->pNext;
lCurPos++;
}
// index was not found
return siListErr;
}
TBListErr CBList::Sort(ESortMode eSortMode)
// sort using methods "IsHigher()" and "Exchange()"
// error: siListErr
{
if (lNumOfOpenReadingSessions>0)
{
#ifdef _DEBUG
// release an error even in encapsulated code
// (OCX controls and so on)
char *pTest=0;
char szTest=*pTest;
#endif
return siListErr;
}
return DoBubbleSort(pFirst, pLast, eSortMode);
}
bool CBList::SetSortBeforeReading(bool bNewValue)
// returns old state
{
if (lNumOfOpenReadingSessions>0)
{
#ifdef _DEBUG
// release an error even in encapsulated code
// (OCX controls and so on)
char *pTest=0;
char szTest=*pTest;
#endif
return siListErr;
}
bool old=SortBeforeReading;
SortBeforeReading=bNewValue;
return old;
}
signed long CBList::FindOpenReadPos() const
{
long lPos=0;
while (bReadEntryUsed[lPos])
{
if (lPos>=lMaxNumRS)
{
return siListErr;
}
lPos++;
}
return lPos;
}
HRead CBList::BeginRead()
{
HRead hNewReadingSession=FindOpenReadPos();
if (hNewReadingSession==siListErr) return siListErr;
if (SortBeforeReading) Sort();
pReadPos[hNewReadingSession]=pFirst;
bReadEntryUsed[hNewReadingSession]=true;
lNumOfOpenReadingSessions++;
return hNewReadingSession;
}
CBListReader CBList::BeginReadEx()
{
return CBListReader(this, BeginRead());
}
PBBaseElem CBList::ReadElem(HRead hRead)
{
PBBaseElem pCurrent=pReadPos[hRead];
if (pReadPos[hRead]!=0)
pReadPos[hRead]=pReadPos[hRead]->pNext;
return pCurrent;
}
TBListErr CBList::EndRead(HRead hRead)
{
bReadEntryUsed[hRead]=false;
lNumOfOpenReadingSessions--;
return siListNoErr;
}
TBListErr CBList::EndRead(CBListReader &oReader)
{
oReader.EndReaderSession();
return siListNoErr;
}
bool CBList::Map(long lTask, long lHint)
{
HRead hRead=BeginRead();
CBBaseElem *poCurElem;
while ((poCurElem=ReadElem(hRead))!=0)
{
if (!OnMapHandle(poCurElem, lTask, lHint))
{
// action was aborted
EndRead(hRead);
return false;
}
}
EndRead(hRead);
// action was not aborted
return true;
}
TBListErr CBList::PutToArchive(CArchive &oArchive, long lSaveParams) const
{
// save the number of elements
long lNumberOfElements=GetNumber();
oArchive << lNumberOfElements;
// go through all elements and save them
PBBaseElem pCurrent=pFirst;
while (pCurrent!=0)
{
if (!pCurrent->PutToArchive(oArchive, lSaveParams))
{
return siListErr;
}
pCurrent=pCurrent->pNext;
}
return siListNoErr;
}
TBListErr CBList::GetFromArchive(CArchive &oArchive, long lLoadParams)
{
// remove old content
DeleteAll();
// get the number of elements
long lNumberOfElements;
oArchive >> lNumberOfElements;
// go through all elements and load them
while (lNumberOfElements>0)
{
// create a new element and fill it with data from the stream;
// we give a desired index to avoid wasting time searching
// for an available id
PBBaseElem poCurElem;
if (!(poCurElem=Add(23456))->GetFromArchive(oArchive, lLoadParams))
{
// return siListErr; // I found this was too strict
// delete the element that we've just created
DeleteElem(poCurElem->GetIndex());
}
lNumberOfElements--;
}
return siListNoErr;
}
TBListErr CBList::SaveToFile(const char *lpszFileName, long lSaveParams)
{
try
{
// open the file
CFile oFile(lpszFileName, CFile::modeCreate | CFile::modeWrite | CFile::shareDenyWrite);
CArchive oArchive(&oFile, CArchive::store);
// put data to it
return PutToArchive(oArchive, lSaveParams)==siListNoErr;
}
catch (...)
{
// error opening the file for exclusive writing
return siListSavErr;
}
}
TBListErr CBList::LoadFromFile(const char *lpszFileName, long lLoadParams)
{
try
{
// open the file
CFile oFile(lpszFileName, CFile::modeRead | CFile::shareDenyNone);
CArchive oArchive(&oFile, CArchive::load);
// get data from it
return GetFromArchive(oArchive, lLoadParams)==siListNoErr;
}
catch (...)
{
// error opening the file for exclusive writing
return siListErr;
}
}
// ---- private definitions ----
TBListErr CBList::Exchange(PBBaseElem pOne, PBBaseElem pTwo)
{
if (pOne==0 || pTwo==0) return siListErr;
if (pOne==pTwo) return siListNoErr;
PBBaseElem pBeforeOne=pOne->GetPrevious();
PBBaseElem pBeforeTwo=pTwo->GetPrevious();
PBBaseElem pAfterOne=pOne->GetNext();
PBBaseElem pAfterTwo=pTwo->GetNext();
// set new pFirst and pLast states, if necessary
if (pOne==pFirst) pFirst=pTwo; else
if (pTwo==pFirst) pFirst=pOne;
if (pOne==pLast) pLast=pTwo; else
if (pTwo==pLast) pLast=pOne;
if (pBeforeTwo==pOne)
{ // Elements follow on each other
if (pOne->pPrevious!=0) pOne->pPrevious->pNext=pTwo;
if (pTwo->pNext!=0) pTwo->pNext->pPrevious=pOne;
pTwo->pPrevious=pOne->pPrevious;
pOne->pPrevious=pTwo;
pOne->pNext=pTwo->pNext;
pTwo->pNext=pOne;
return siListNoErr;
}
if (pBeforeOne==pTwo)
{ // Elements follow on each other
if (pTwo->pPrevious!=0) pTwo->pPrevious->pNext=pOne;
if (pOne->pNext!=0) pOne->pNext->pPrevious=pTwo;
pOne->pPrevious=pTwo->pPrevious;
pTwo->pPrevious=pOne;
pTwo->pNext=pOne->pNext;
pOne->pNext=pTwo;
return siListNoErr;
}
// if the execution comes to here both pOne and pTwo do not
// follow each other
if (pTwo->pNext!=0) pTwo->pNext->pPrevious=pOne;
if (pTwo->pPrevious!=0) pTwo->pPrevious->pNext=pOne;
if (pOne->pNext!=0) pOne->pNext->pPrevious=pTwo;
if (pOne->pPrevious!=0) pOne->pPrevious->pNext=pTwo;
PBBaseElem pDummy;
pDummy=pOne->pNext;
pOne->pNext=pTwo->pNext;
pTwo->pNext=pDummy;
pDummy=pOne->pPrevious;
pOne->pPrevious=pTwo->pPrevious;
pTwo->pPrevious=pDummy;
return siListNoErr;
}
PBBaseElem CBList::FindLowest(PBBaseElem pBeginFrom, PBBaseElem pGoTo, ESortMode eSortMode)
{ // finds the element with the lowest key in a given interval
if (pBeginFrom==pGoTo) return pBeginFrom;
PBBaseElem pCurLowest=pBeginFrom;
while (pBeginFrom!=pGoTo->GetNext())
{
if (eSortMode==eAscending)
{
if (pBeginFrom->IsHigher(pCurLowest)==-1)
pCurLowest=pBeginFrom;
}
else
{
if (pBeginFrom->IsHigher(pCurLowest)==1)
pCurLowest=pBeginFrom;
}
pBeginFrom=pBeginFrom->pNext;
}
return pCurLowest;
}
TBListErr CBList::DoBubbleSort(PBBaseElem pLeft, PBBaseElem pRight, ESortMode eSortMode)
{
if (pLeft==0 || pRight==0) return siListNoErr; // sucessfully finished
if (pLeft==pRight) return siListNoErr; // sucessfully finished
PBBaseElem pLeftSortBorder=pLeft;
PBBaseElem pLowestElem;
while (pLeftSortBorder!=pRight)
{
pLowestElem=FindLowest(pLeftSortBorder, pRight, eSortMode);
// exchanging the elements may have lead to a change of pRight
if (pRight==pLowestElem) pRight=pLeftSortBorder;
else if (pRight==pLeftSortBorder) pRight=pLowestElem;
Exchange(pLowestElem, pLeftSortBorder);
// pLowestElem's successor is now the new left sort border
pLeftSortBorder=pLowestElem->pNext;
}
return siListNoErr;
}