/*

* Copyright (c) 2006 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:  

*

*/

#ifndef C_NCD_QUERY_ITEM_H

#define C_NCD_QUERY_ITEM_H

#include <e32cmn.h>

#include "ncdqueryitem.h"

#include "catalogsbaseimpl.h"

#include "catalogsinterfacebase.h"

class MNcdConfigurationProtocolQueryElement;

class CNcdString;

class CNcdQuery;

class RWriteStream;

class RReadStream;

const TInt KMaxTIntLengthInChars( 11 );

/**

 *  Implementation for query item.

 *

 *  Base class for query items. This class is abstract.

 */

class CNcdQueryItem : public CCatalogsInterfaceBase,

                      public virtual MNcdQueryItem

    {

public:

    virtual void InternalizeL( RReadStream& aReadStream );

    virtual void InternalizeL(

        const MNcdConfigurationProtocolQueryElement& aQueryElement );

    virtual void ExternalizeL( RWriteStream& aWriteStream ) const;

    const TDesC& Id() const;

    TBool IsSet() const;

    virtual const TDesC& ValueL() = 0;

    /**

     * If ETrue, this item will be visible only inside the engine.

     */

    TBool IsInvisible() const;

    /**

     * Internalizes just the id's and response value.

     *      

     */

    //void InternalizeResponseL( RWriteStream& aWriteStream ) = 0;

    /**

     * Externalizes just the id's and response value.

     *

     * @note Use a dynamic buffer for the stream,

     * amout of data written can vary.

     */

    //void ExternalizeResponseL( RWriteStream& aWriteStream ) const = 0;

public: // From MNcdQueryItem

    /**

     * @see MNcdQueryItem

     */

    virtual TNcdInterfaceId Type() const;

    /**

     * @see MNcdQueryItem

     */

    virtual MNcdQueryItem::TSemantics Semantics() const;

    /**

     * @see MNcdQueryItem

     */

    virtual const TDesC& Label() const;

    /**

     * @see MNcdQueryItem

     */

    virtual const TDesC& Message() const;

    /**

     * @see MNcdQueryItem

     */

    virtual const TDesC& Description() const;

    /**

     * @see MNcdQueryItem

     */

    virtual TBool IsOptional() const;

protected:

    CNcdQueryItem( CNcdQuery& aParent );

    virtual ~CNcdQueryItem();

    virtual void ConstructL();   

protected:

    CNcdQuery& iParentQuery;

    HBufC* iId;

    MNcdQueryItem::TSemantics iSemantics;

    CNcdString* iLabel;

    CNcdString* iMessage;

    CNcdString* iDescription;

    mutable HBufC* iLocalizedLabel;

    mutable HBufC* iLocalizedMessage;

    mutable HBufC* iLocalizedDescription;

    TBool iIsOptional;

    TNcdInterfaceId iType;

    HBufC* iValue;

    TBool iIsSet;    

    TBool iIsInvisible;

    };

#endif //  C_NCD_QUERY_ITEM_H