/*

* Copyright (c) 2007-2008 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_HNMDQUERY_H

#define C_HNMDQUERY_H

#include <e32base.h>

#include <xmlengelement.h>

#include "hnglobals.h"

class CHnMdServiceCommand;

class CHnMdBaseKey;

class CLiwGenericParamList;

class CHnMdService;

/**

 * Query.

 * 

 * This class represents the query.

 * 

 * This class allows sending queries to different services.

 * 

 * Queries are mostly used during evaluation.

 *

 * @lib hnmetadatamodel

 * @since S60 5.0 *** for example, S60 v3.0

 * @ingroup group_hnmetadatamodel

 */

NONSHARABLE_CLASS(CHnMdQuery) : public CBase

    {

public:

    /**

     * Two-phase constructor.

     *

     * @since S60 5.0

     * @param aElement Xml element.

     * @return Fully cosntructed object.

     */

    static CHnMdQuery* NewL( TXmlEngElement aElement );

    /**

     * Two-phase constructor.

     *

     * @since S60 5.0

     * @param aElement Xml element.

     * @return Fully cosntructed object.

     */

    static CHnMdQuery* NewLC( TXmlEngElement aElement );

    /**

     * Standard C++ virtual destructor.

     *

     * @since S60 5.0

     */

    virtual ~CHnMdQuery();

    /**

     * Gets namespace.

     *

     * @since S60 5.0

     * @return Namespace.

     */

    const TDesC& NameSpace() const;

    /**

     * Gets namespace.

     *

     * @since S60 5.0

     * @return Service object.

     */

    CHnMdService& GetService() const;

private:

    /**

     * Standard C++ constructor.

     *

     * @since S60 5.0

     */

    CHnMdQuery();

    /**

     * Standard symbian 2nd phase constructor.

     *

     * @since S60 5.0

     * @param aElement Xml element.

     */

    void ConstructL(TXmlEngElement aElement);

     /**

     * Sets namespace.

     *

     * @since S60 5.0

     * @param aNameSpace Namespace descriptor.

     */

    void SetNameSpaceL( const TDesC& aNameSpace );

    /**

     * Sets namespace.

     *

     * @since S60 5.0

     * @param aAttr Xml attribute.

     */

    void SetNameSpaceL( TXmlEngAttr aAttr );

private: // data

    /**

     * Own - Namespace.

     */

    RBuf iNameSpace;

    /**

     * Own - service object.

     */

    CHnMdService* iService;

    };

#endif // C_HNMMQUERY_H