// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

// which accompanies this distribution, and is available

// at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

//

#ifndef __CCALDATAEXCHANGE_H__ 

#define __CCALDATAEXCHANGE_H__

#include <calentry.h>

class CCalDataExchangeImpl;

class CCalSession;

class RWriteStream;

/** The default number of entries to import or export between callbacks.

@publishedAll

@released

*/

const TInt KDefaultNumberOfEntriesToHandle = 10;

/** A call back class to show the progress of long-running operations.

When a long-running operation is carried out, this class is used to signal its progress, 

and when the function is complete.

@publishedAll

@released

*/

class MCalDataExchangeCallBack

	{

public:

	/** Progress callback. 

	This calls the observing class with the percentage complete of the current operation.

	This also propagates any error to the observing class.

	@param aPercentageCompleted The percentage complete. */

	virtual void Progress(TInt aPercentageCompleted) = 0;

	/** Progress callback.

	This calls the observing class when the current operation is finished. */

	virtual void Completed() = 0;

	/* Retrieve the number of entries to handle at once. 

	@return The number of entries to handle at once.

	*/

	virtual TInt NumberOfEntriesToHandleAtOnce() { return KDefaultNumberOfEntriesToHandle; };

	};

/** 

This class provides functionality for importing and exporting vCal entries.

@publishedAll

@released

*/

NONSHARABLE_CLASS(CCalDataExchange) : public CBase

	{

public:

	IMPORT_C static CCalDataExchange* NewL(CCalSession& aSession);

	IMPORT_C ~CCalDataExchange();

	IMPORT_C void ImportL(TUid aDataFormat, RReadStream& aReadStream, RPointerArray<CCalEntry>& aCalEntryArray);

	IMPORT_C void ImportL(TUid aDataFormat, RReadStream& aReadStream, RPointerArray<CCalEntry>& aCalEntryArray, TInt aFlags);

	IMPORT_C void ExportL(TUid aDataFormat, RWriteStream& aWriteStream, RPointerArray<CCalEntry>& aCalEntryArray);	

	IMPORT_C void ImportL(TUid aDataFormat, RReadStream& aReadStream, RPointerArray<CCalEntry>& aCalEntryArray, TInt aFlags, TInt aNumEntries);

	IMPORT_C void ImportAsyncL(TUid aDataFormat, RReadStream& aReadStream, RPointerArray<CCalEntry>& aCalEntryArray, MCalDataExchangeCallBack& aObserver, TInt aFlags);

	IMPORT_C void ExportAsyncL(TUid aDataFormat, RWriteStream& aWriteStream, RPointerArray<CCalEntry>& aCalEntryArray, MCalDataExchangeCallBack& aObserver);

private:

	CCalDataExchange();

	void ConstructL(CCalSession& aSession);

private:

	CCalDataExchangeImpl* iImpl;

	};

#endif // __CCALDATAEXCHANGE_H__