/*

* Copyright (c) 2007-2008 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:  Active Object header for providing data asynchronously

*

*/

#ifndef __MULASYNCDATAPROVIDER_H__

#define __MULASYNCDATAPROVIDER_H__

#include <e32base.h>    // For CActive

#include <mul/imulmodelprovider.h>

#include <mul/muldatapath.h>

#include <vector>

#include "muldatawindow.h"

#include "mulpagedatawindow.h"

using namespace std;

//Forward declarations

namespace Alf

	{

//Forward declarations

class MulAsyncData

    {

public:

    bool operator == (const MulAsyncData& aData )

        {

        return ( this->mStartIndex == aData.mStartIndex && this->mRange == aData.mRange );

        }

public:

    int mStartIndex;

	int mRange;

	MulDataPath mPath;

    };

class MulAsyncDataProvider : public CActive

	{

public : // Constructor and Destructor

    /// need to have two-phase construction

    /// - otherwise mixing leaves and throws

	MulAsyncDataProvider( IMulModelProvider& aDataProvider, const MulPageDataWindow& aDataWindow );

	~MulAsyncDataProvider();

    void ProvideData( int aStartIndex, int aRange, const MulDataPath& aPath, const bool aIsSync = false );

private: 

	/**

	 * Active call back funtion . 

	 */

	void RunL();

	void DoCancel();

	void ActivateAndComplete();

	int GetFirstIndexForWhichDataIsPresent(int aStartIndex, int aEndIndex);

private: //data

	IMulModelProvider&             mDataProvider;

	vector<MulAsyncData>           mDataQueue;

	const MulPageDataWindow&       mDataWindow;

	}; //end of class.

	} // End of namespace .

#endif  //__MULASYNCDATAPROVIDER_H__

// End of file