// Copyright (c) 1999-2009 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:

// This file contains the header file of the CSmsBuffers.

// 

//

/**

 @file

*/

#ifndef __GSMUBUF_H__

#define __GSMUBUF_H__

#include <e32std.h>

#include <s32strm.h>

class CEditableText;

class RReadStream;

class RWriteStream;

/**

 *  The base class for all SMS buffers.

 *  @publishedAll

 *  @released

 */

class CSmsBufferBase : public CBase

	{

public:

	enum

		{

		EMaxBufLength=0x100

		};

public:

	/**

	 *  Gets the number of characters in the buffer.

	 *  

	 *  	@return The number of characters in the buffer. 

	 */

	virtual TInt Length() const=0;

	/**

	 *  Extracts buffer data to a descriptor.

	 *  

	 *  @param aBuf On return, buffer data

	 *  @param aPos Position within buffer to begin reading

	 *  	@param aLength The number of bytes to read from the buffer 

	 */

	virtual void Extract(TDes& aBuf,TInt aPos,TInt aLength) const=0;

	/**

	 *  Inserts data into the buffer.

	 *  

	 *  @param aPos Position in the buffer to insert the data

	 *  	@param aBuf The data to insert into the buffer 

	 */

	virtual void InsertL(TInt aPos,const TDesC& aBuf)=0;

	/**

	 *  Deletes data from the buffer.

	 *  

	 *  @param aPos Position in the buffer to delete the data

	 *  	@param aLength The number of bytes to delete from the buffer 

	 */

	virtual void DeleteL(TInt aPos,TInt aLength)=0;

	/** Resets the buffer. */

	virtual void Reset()=0;

	IMPORT_C void InternalizeL(RReadStream& aStream);

	IMPORT_C void ExternalizeL(RWriteStream& aStream) const;

	};

/**

 *  This is the simplest implementation of CSmsBufferBase.

 *  

 *  It stores the buffer in an array of TTexts.

 *  @publishedAll

 *  @released

 */

class CSmsBuffer : public CSmsBufferBase

	{

public:

	IMPORT_C static CSmsBuffer* NewL();

	IMPORT_C ~CSmsBuffer();

	IMPORT_C TInt Length() const;

	IMPORT_C void Extract(TDes& aBuf,TInt aPos,TInt aLength) const;

	IMPORT_C void InsertL(TInt aPos,const TDesC& aBuf);

	IMPORT_C void DeleteL(TInt aPos,TInt aLength);

	IMPORT_C void Reset();

private:

	CSmsBuffer();

private:

	CArrayFix<TText>* iBuffer;

	};

/**

 *  SMS buffer, implemented as a thin wrapper over CEditableText.

 *  

 *  This class is designed to be used by the Message Server, which stores SMS

 *  text as CRichText, which is derived from CEditableText.

 *  @publishedAll

 *  @released

 */

class CSmsEditorBuffer : public CSmsBufferBase

	{

public:

	IMPORT_C static CSmsEditorBuffer* NewL(CEditableText& aText);

	IMPORT_C ~CSmsEditorBuffer();

	IMPORT_C TInt Length() const;

	IMPORT_C void Extract(TDes& aBuf,TInt aPos,TInt aLength) const;

	IMPORT_C void InsertL(TInt aPos,const TDesC& aBuf);

	IMPORT_C void DeleteL(TInt aPos,TInt aLength);

	IMPORT_C void Reset();

private:

	CSmsEditorBuffer(CEditableText& aText);

private:

	CEditableText& iText;

	};

#endif // !defined __GSMUBUF_H__