/*

* Copyright (c) 2002-2007 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:  Virtual Phonebook base interface for contact field data. 

*                Sub classes have static Cast functions for safe casting.

*

*/

#ifndef MVPBKCONTACTFIELDDATA_H

#define MVPBKCONTACTFIELDDATA_H

// INCLUDES

#include <e32cmn.h>

#include <e32std.h>

#include <vpbkfieldtype.hrh>

// CONSTANTS

/// Constant indicating that field length is unlimited.

const TInt KVPbkUnlimitedFieldLength = -1;

// CLASS DECLARATIONS

/**

 * Virtual Phonebook field data interface.

 * Interface for contact field data. Different data type interfaces

 * are derived from this interface, which have data manipulation 

 * functionality.

 */

class MVPbkContactFieldData

    {

    public:  // Destructor

        /**

         * Destructor.

         */

        virtual ~MVPbkContactFieldData() { }

    public:  // New functions

        /**

         * Returns the derived data type id.

         * @return Contact field storage type.

         */

        virtual TVPbkFieldStorageType DataType() const =0;

        /**

         * Returns true if the storage is empty.

         * @return ETrue if the data field is empty.

         */

        virtual TBool IsEmpty() const =0;

        /**

         * Copies data from given field data.

         * @param aFieldData    Data that is copied to this object.

         * @precond aFieldData.DataType() == this->DataType()

         */

        virtual void CopyL(const MVPbkContactFieldData& aFieldData) =0;

        /**

         * Returns an extension point for this interface or NULL.

         * @param aExtensionUid Uid of extension.

         * @return Extension point or NULL.

         */

        virtual TAny* ContactFieldDataExtension(

                TUid /*aExtensionUid*/) { return NULL; }

    };

#endif  // MVPBKCONTACTFIELDDATA_H

// End of File