--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/persistentstorage/dbms/utable/UT_TBSRC.CPP	Fri Jan 22 11:06:30 2010 +0200
@@ -0,0 +1,309 @@
+// Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#include "UT_STD.H"
+
+// Class CDbReverseIterator
+
+NONSHARABLE_CLASS(CDbReverseIter) : public CDbRecordIter
+	{
+public:
+	CDbReverseIter(CDbRecordIter* anIterator);
+	~CDbReverseIter();
+private:
+	TInt Count() const;
+	TDbRecordId CurrentL();
+	TBool GotoL(TDbPosition aPosition);
+	TBool GotoL(TDbRecordId aRecordId,RDbTableRow& aBuffer);
+	TBool SeekL(const TDbLookupKey& aKey,RDbTable::TComparison aComparison);
+	TDeleted DoDeletedL(TDbPosition aPosition,TDbRecordId aRecordId,const RDbTableRow* aRow);
+private:
+	CDbRecordIter* iIter;
+	};
+
+CDbReverseIter::CDbReverseIter(CDbRecordIter* aIterator)
+	: CDbRecordIter(aIterator->Host()),iIter(aIterator)
+	{}
+
+CDbReverseIter::~CDbReverseIter()
+	{
+	delete iIter;
+	}
+
+TInt CDbReverseIter::Count() const
+	{
+	return iIter->Count();
+	}
+
+TDbRecordId CDbReverseIter::CurrentL()
+	{
+	return iIter->CurrentL();
+	}
+
+TBool CDbReverseIter::GotoL(TDbPosition aPosition)
+	{
+	return iIter->GotoL(TDbPosition(EDbLast-aPosition));
+	}
+
+TBool CDbReverseIter::GotoL(TDbRecordId aRecord,RDbTableRow& aRow)
+	{
+	return iIter->GotoL(aRecord,aRow);
+	}
+
+TBool CDbReverseIter::SeekL(const TDbLookupKey& aKey,RDbTable::TComparison aComparison)
+//
+// Reverse the comparison
+//
+	{
+	return iIter->SeekL(aKey,RDbTable::TComparison(RDbTable::EGreaterThan-aComparison));
+	}
+
+CDbReverseIter::TDeleted CDbReverseIter::DoDeletedL(TDbPosition aPosition,TDbRecordId aRecordId,const RDbTableRow* aRow)
+//
+// Need to invert the position.
+//
+	{
+	return iIter->DoDeletedL(TDbPosition(EDbLast-aPosition),aRecordId,aRow);
+	}
+
+// Class CDbTableSource
+
+CDbTableSource::CDbTableSource()
+	{}
+
+CDbTableSource::~CDbTableSource()
+	{
+	delete iIter;
+	iRow.Close();
+	}
+
+void CDbTableSource::Construct(CDbTable* aTable)
+//
+// We own the table pass in
+//
+	{
+	iIterMark.Construct(aTable->Generation());
+	iRow.Open(aTable);
+	}
+
+void CDbTableSource::ReverseIteratorL()
+//
+// Plug in a reverse iterator adaptor for the iterator
+//
+	{
+	iIter=new(ELeave) CDbReverseIter(iIter);
+	}
+
+TInt CDbTableSource::ColumnCount() const
+	{
+	return iRow.Table().Def().Columns().Count();
+	}
+
+const TDbColumnDef& CDbTableSource::ColumnDef(TDbColNo aCol) const
+	{
+	return iRow.Table().Def().Columns()[aCol];
+	}
+
+RDbRow* CDbTableSource::RowBuffer()
+	{
+	return &iRow;
+	}
+
+TDbColumn CDbTableSource::Column(TDbColNo aColNo)
+	{
+	return TDbColumn(iRow,aColNo);
+	}
+
+void CDbTableSource::Reset()
+	{
+	iReset=ETrue;
+	}
+
+TBool CDbTableSource::EvaluateL(TInt&,TDbRecordId&,TBool&)
+	{
+	return EFalse;
+	}
+
+TBool CDbTableSource::Unevaluated()
+	{
+	return EFalse;
+	}
+
+TInt CDbTableSource::CountL()
+//
+// Count the records
+//
+	{
+	if (iReset)
+		OpenIteratorL();
+	return iIter->Count();
+	}
+
+void CDbTableSource::OpenIteratorL()
+//
+// Re-open the iterator after a reset
+//
+	{
+	__ASSERT(iIter);
+	if (iIter->Host().OpenL())
+		__LEAVE(KErrCorrupt);
+	iReset=EFalse;
+	}
+
+CDbTableSource::TGoto CDbTableSource::GotoL(TInt& aWork,TDbPosition aPosition,TDbRecordId& aRecordId)
+//
+// Move to the position specified. If out of synch, try to resynch the iterator
+// using aRecordId
+//
+	{
+	__ASSERT(iIter);
+	TInt work=aWork;
+	if (work<0)
+		return EExhausted;
+	aWork=work-EWorkToIterate;
+	CDbRecordIter& iter=*iIter;
+	if (iIterMark.Changed())
+		{	// two possible resaons for this
+		if (iReset)
+			OpenIteratorL();
+		if (aPosition==EDbNext || aPosition==EDbPrevious)
+			{	// table modified
+			if (aRecordId==KDbNullRecordId)
+				return ESynchFailure;
+			if (!iter.GotoL(aRecordId,iRow))
+				{	// record has been deleted
+				switch(iter.DeletedL(aPosition,aRecordId))
+					{
+				case CDbRecordIter::EAtRow:			// found it
+					aRecordId=iter.CurrentL();
+					return ESuccess;
+				case CDbRecordIter::ENoRow:			// no more rows
+					aRecordId=KDbNullRecordId;
+					return ENoRow;
+				case CDbRecordIter::ENotSupported:	// couldn't re-snych
+					return ESynchFailure;
+					}
+				}
+			}
+		iIterMark.Mark();
+		}
+	if (iter.GotoL(aPosition))
+		{
+		aRecordId=iter.CurrentL();
+		return ESuccess;
+		}
+	else
+		{
+		aRecordId=KDbNullRecordId;
+		return ENoRow;
+		}
+	}
+
+TBool CDbTableSource::SynchL(TDbRecordId aRecordId)
+	{
+	if (iReset)
+		OpenIteratorL();
+	TBool found=iIter->GotoL(aRecordId,iRow);
+	iIterMark.Mark();
+	return found;
+	}
+
+TBool CDbTableSource::GotoL(TDbRecordId aRecordId)
+	{
+	return iRow.Table().ExistsL(aRecordId) ? SynchL(aRecordId) : EFalse;
+	}
+
+void CDbTableSource::ReadRowL(TDbRecordId aRecordId)
+	{
+	iRow.ReadL(aRecordId);
+	}
+
+void CDbTableSource::NewRowL(TDbRecordId aCopyRecord)
+	{
+	if (iIter!=NULL&&iReset)
+		OpenIteratorL();
+	iRow.NewL(aCopyRecord);
+	}
+
+void CDbTableSource::PrepareToWriteRowL(TWrite aWrite)
+	{
+	__ASSERT(aWrite==EReplace||aWrite==EAppend);
+	if (aWrite==EReplace)
+		iRow.PrepareReplaceL();
+	else
+		iRow.PrepareAppendL();
+	}
+
+TDbRecordId CDbTableSource::WriteRowL(TWrite aWrite,TSynch aSynch)
+	{
+	__ASSERT(aWrite==EReplace||aWrite==EAppend);
+	TDbRecordId id=aWrite==EReplace ? iRow.ReplaceL() : iRow.AppendL();
+	if (aSynch==ESynch)
+		{
+		__DEBUG(TBool dbgchk=) SynchL(id);
+		__ASSERT(dbgchk);
+		}
+	return id;
+	}
+
+CDbTableSource::TDelete CDbTableSource::DeleteRowL(TDbRecordId& aRecordId,TSynch aSynch)
+//
+// Remove the row from the table. Synchronise the iterator if required
+// When not synchronising, the return value is not significant
+//
+	{
+	// if the table has changed, we may need to re-synch the iterator before deleting
+	// this is important if neighbouring rows have been deleted by another view
+	if (aSynch==ESynch && iIterMark.Changed() && !SynchL(aRecordId))
+		__LEAVE(KErrNotFound);		// it has been deleted already!
+	iRow.DeleteL(aRecordId);
+	if (aSynch==ESynch)
+		{
+		CDbRecordIter::TDeleted del=iIter->DeletedL(EDbNext,aRecordId,iRow);
+		__ASSERT(del!=CDbRecordIter::ENotSupported);	// must always be able to synch with row data
+		iIterMark.Mark();
+		if (del==CDbRecordIter::EAtRow)
+			{	// pass back the next record id
+			aRecordId=iIter->CurrentL();
+			return EDeletedAtNext;
+			}
+		}
+	return EDeletedAtEnd;
+	}
+
+void CDbTableSource::SetIndexL(const TDesC* anIndex)
+	{
+	CDbRecordIter* iter=anIndex ? iRow.Table().IteratorL(*anIndex) : iRow.Table().IteratorL();
+	delete iIter;
+	iIter=iter;
+	}
+
+TBool CDbTableSource::SeekL(const TDbLookupKey& aKey,RDbTable::TComparison aComparison,TDbRecordId& aRecordId)
+	{
+	if (iReset)
+		OpenIteratorL();
+	CDbRecordIter& iter=*iIter;
+	TBool atrow=iter.SeekL(aKey,aComparison);
+	aRecordId=atrow ? iter.CurrentL() : KDbNullRecordId;
+	iIterMark.Mark();
+	return atrow;
+	}
+
+CSqlSearchCondition* CDbTableSource::ParseConstraintLC(const TDesC& aCondition)
+	{
+	CSqlSearchCondition* sc=Sql::ParseSearchConditionLC(aCondition);
+	sc->BindL(iRow);
+	return sc;
+	}