/*

* Copyright (c) 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:

*

*  Version     : %version: 3 %

*/

#ifndef HGBUFFERMANAGER_H_

#define HGBUFFERMANAGER_H_

class HgBufferManagerObserver;

class HgBufferManager

{

public:    

    HgBufferManager(

                    HgBufferManagerObserver* aObserver,

                    int aBufferSize,

                    int aBufferTreshold,

                    int aInitialPosition,

                    int aTotalCount );

	~HgBufferManager();

	void setPosition( int aIndex );

	void resetBuffer( int aPosition, int aTotalCount);

	void resizeCache(int newSize, int newTreshold);

    void aboutToRemoveItem(int pos);

    void removedItem(int pos);

    void aboutToInsertItem(int pos);

    void insertedItem(int pos);

private:

	void calculate();

private:

	HgBufferManagerObserver* mObserver; 

	int mBufferSize;

	int mBufferTreshold;

	int mBufferPosition;

	int mDiff;

	int mTotalCount;

	bool mResetOrdered;

	int mRequestStart;

	int mRequestCount;

	int mReleaseStart;

	int mReleaseCount;

};

#endif // HGBUFFERMANAGER_H_