/*

* Copyright (c) 2003, 2004 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:  Exif tag wrapper implementation

*

*/

#ifndef EXIFTAGIMPL_H

#define EXIFTAGIMPL_H

//  INCLUDES

#include "ExifTag.h"

// CONSTANTS

// MACROS

// DATA TYPES

// FUNCTION PROTOTYPES

// FORWARD DECLARATIONS

// CLASS DECLARATION

/**

* CExifTagImpl

* Implementation class for manipulating Exif Tags. An instance of this class 

* can be instantiated 

* providing the internal data to insert into the Exif data. 

* 

* @lib ExifLib

* @since 2.6 

*/

NONSHARABLE_CLASS( CExifTagImpl ): public CExifTag

    {

	public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        */

    	static CExifTagImpl* NewL( 

            TUint16 aTagId, 

            TExifTagDataType aDataType, 

            TUint32 aDataCount, 

            HBufC8* aDataBuffer,

            TBool aCheckValidity );

        /**

        * Two-phased constructor.

        */

    	static CExifTagImpl* NewL( TExifTagInfo aTagInfo, HBufC8* aDataBuffer, TBool aCheckValidity );

        /**

        * Destructor.

        */

        virtual ~CExifTagImpl();

	public:   // Functions from base classes

        /**

        * Duplicate constructor. Creates an exact copy instance of the tag.

        * @since 2.6

        * @return Pointer to the new tag instance.

        */

    	CExifTag* DuplicateL() const;

        /**

        * Returns the informative fields of a tag.

        * @since 2.6

        * @return Informative fields of the tag in associated structure.

        */

    	TExifTagInfo TagInfo() const;

        /**

        * Returns the ID of the tag.

        * @since 2.6

        * @return The tag ID

        */

    	TUint16 Id() const;

        /**

        * Returns the data type of the tag.

        * @since 2.6

        * @return The tag data type

        */

    	TExifTagDataType DataType() const;

        /**

        * Returns the data count of the tag. Data count is not in bytes, 

        * it specifies the number of elements in the data type.

        * @since 2.6

        * @return The number of tag data elements

        */

    	TUint32 DataCount() const;

        /**

        * Returns the data stored in the tag.

        * @since 2.6

        * @return Unmodifiable pointer to the tag data.

        */

    	TPtrC8 Data() const;

        /**

        * Returns the total size of the tag in bytes.

        * @since 2.6

        * @return The total size of the tag in bytes

        */

        TUint Size() const;

	private:

        /**

        * Constructor.

        */        

    	CExifTagImpl( TExifTagInfo aTagInfo );

        /**

        * By default Symbian 2nd phase constructor is private.

        */

    	void ConstructL( HBufC8* aDataBuffer, TBool aCheckValidity );

	private:

        // Informative fields of a tag

    	TExifTagInfo iTagInfo;

        // Data of the tag.

    	HBufC8* iData;

    };

#endif      // EXIFTAGIMPL_H

// End of File