persistentstorage/sql/SRC/Common/SqlMap.inl
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 18 Aug 2010 11:30:17 +0300
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permissions -rw-r--r--
Revision: 201033 Kit: 201033
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// Copyright (c) 2004-2010 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// RSqlMap template class implementation.
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// ////////////////////                 TSqlPair implementation              //////////////////////////////////
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// 
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//
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/**
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 Initializes TSqlPair data members using the supplied parameter values.
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 @param aKey Key part of TSqlPair object
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 @param aData Data part of TSqlPair object
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*/
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template <class KEY, class DATA, class REFCNTR> 
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TSqlPair<KEY, DATA, REFCNTR>::TSqlPair(const KEY& aKey, const DATA& aData) :
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	iKey(aKey),
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	iData(aData)
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	{
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	}
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/**
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Initializes TSqlPair data members using the supplied parameter value.
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@param aKey Key part of TSqlPair object
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*/
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template <class KEY, class DATA, class REFCNTR> 
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TSqlPair<KEY, DATA, REFCNTR>::TSqlPair(const KEY& aKey) :
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	iKey(aKey)
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	{
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	}
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/**
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Initializes TSqlPair data members with their default values.
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*/
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template <class KEY, class DATA, class REFCNTR> 
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TSqlPair<KEY, DATA, REFCNTR>::TSqlPair()
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	{
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	}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////                 RSqlMap implementation              ///////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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@param aOrder An object of TLinearOrder< TSqlPair<KEY, DATA, REFCNTR> > type, which will be used when
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new elements are inserted into the collection (to determine their order).
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@param aDestructor An object of TSqlPairDestructor<KEY, DATA> type which will be used for the destruction of
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KEY and DATA TSqlPair data members.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>::RSqlMap(const TLinearOrder< TSqlPair<KEY, DATA, REFCNTR> >& aOrder, const DESTRUCTOR& aDestructor) :
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	iOrder(aOrder),
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	iDestructor(aDestructor)
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	{
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	}
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/**
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Closes RSqlMap instance and destroys all RSqlMap data.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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void RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>::Close()
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	{
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	TInt idx = iSet.Count();
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	while(--idx >= 0)
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		{
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		TSqlPair<KEY, DATA, REFCNTR>& pair = iSet[idx];
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		iDestructor.Destroy(pair.iKey, pair.iData);
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		}
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	iSet.Close();
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	}
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/**
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This method will create and insert new (KEY, DATA, REFCNTR) pair in the map.
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RSqlMap class maintains a set of reference counted objects.
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If an object with aKey key is already in the map, no insertion will occur, the reference counter
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of the existing object will be incremented.
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@param aKey The key part of TSqlPair object, which will be inserted
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@param aData The data part of TSqlPair object, which will be inserted
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@return System-wide error code if the insertion fails, reference counter value otherwise.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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TInt RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>::Insert(const KEY& aKey, const DATA& aData)
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	{
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	TInt idx = iSet.FindInOrder(TSqlPair<KEY, DATA, REFCNTR>(aKey), iOrder);
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	if(idx >= 0)
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		{
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		return iSet[idx].iRefCounter.Increment();
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		}
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	else
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		{
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		TInt err = iSet.InsertInOrder(TSqlPair<KEY, DATA, REFCNTR>(aKey, aData), iOrder);
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		return err == KErrNone ? 1 : err;
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		}
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	}
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/**
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This method removes an element with aKey key from the map.
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If there is no such element in the map, the debug verison of the method will panic.
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RSqlMap class maintains a set of reference counted objects.
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If an object with aKey key is in the map, the reference counter of the object will be decremented.
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If the object's reference counter reaches 0 then the object will be destroyed.
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@param aKey The key of TSqlPair object, which has to be removed from the collection.
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@panic 7 In _DEBUG mode if there is no entry with aKey key in the RSqlMap container.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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void RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>::Remove(const KEY& aKey)
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	{
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	TInt idx = iSet.FindInOrder(TSqlPair<KEY, DATA, REFCNTR>(aKey), iOrder);
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	if(idx != KErrNotFound)
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		{
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		TSqlPair<KEY, DATA, REFCNTR>& pair = iSet[idx];
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		if(pair.iRefCounter.Decrement() == 0)
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			{
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			iDestructor.Destroy(pair.iKey, pair.iData);
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			iSet.Remove(idx);
17
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#ifdef _DEBUG
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//This is used prevent the failure of the resource allocation checking in debug mode. 
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                if(iSet.Count() == 0)
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                    {
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                    iSet.Reset();
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                    }
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#endif  
0
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			}
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		return;
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		}
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	__ASSERT_DEBUG(EFalse, __SQLPANIC(ESqlPanicInternalError));
0
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	}
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/**
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This method performs a search for an element with aKey key in the map.
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If such element exists, the method will return a pointer to it.
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If not, then the method will return NULL.
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@param aKey The search key.
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@return A pointer to the found element or NULL.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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TSqlPair<KEY, DATA, REFCNTR>* RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>::Entry(const KEY& aKey)
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	{
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	TInt idx = iSet.FindInOrder(TSqlPair<KEY, DATA, REFCNTR>(aKey), iOrder);
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	return idx == KErrNotFound ? NULL : &iSet[idx];
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	}
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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///////////////////////            TSqlMapIterator implementation              ////////////////////////////////
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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Initializes TSqlMapIterator instance.
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@param aMap A const reference to the RSqlMap object, which will be iterated.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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TSqlMapIterator<KEY, DATA, REFCNTR, DESTRUCTOR>::TSqlMapIterator(const RSqlMap<KEY, DATA, REFCNTR, DESTRUCTOR>& aMap) :
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	iMap(aMap),
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	iIndex(0)
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	{
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	}
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/**
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If iterator's current position is not beyond the end of the map,
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the iterator will retrieve current map entry into aPair argument, advance iterator position
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by 1 and return ETrue. 
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Otherwise the iterator will return EFalse.
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@param aPair An output parameter, which references the location, where the next RSqlMap element will be stored.
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@return ETrue The next RSqlMap element successfully loaded into aPair parameter. This is not the 
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              end of RSqlMap collection.
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@return EFalse The next RSqlMap element successfully loaded into aPair parameter. This is the 
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              end of RSqlMap collection. Do not call Next() anymore.
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*/
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template <class KEY, class DATA, class REFCNTR, class DESTRUCTOR> 
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TBool TSqlMapIterator<KEY, DATA, REFCNTR, DESTRUCTOR>::Next(TSqlPair<KEY, DATA, REFCNTR>& aPair) const
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	{
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	return (iIndex < iMap.iSet.Count()) ? aPair = iMap.iSet[iIndex++], ETrue : EFalse;
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	}