/*

* Copyright (c) 2008-2009 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:    wrapper for Back Stepping Service

*

*/

#ifndef C_GLX_BACKSERVICE_WRAPPER

#define C_GLX_BACKSERVICE_WRAPPER

#include <e32base.h>

class MLiwInterface;

class CLiwGenericParamList;

class CLiwServiceHandler;

/**

 *   BS Service wrapper

 *

 *  @since S60 v3.2

 */

class CGlxBackServiceWrapper : public CBase

    {

public:

    /**

     * Two-phased constructors

     * @param aUid client application UID

     */

    static CGlxBackServiceWrapper* NewL( const TUid aUid );

    static CGlxBackServiceWrapper* NewLC( const TUid aUid );

    /**

    * Destructor.

    */

    virtual ~CGlxBackServiceWrapper();

    /**

     * Forwards activation event

     *

     * @since S60 v3.2

     * @param aState state of application like view ids

     * @param aEnter indicate if it is entry/exit activation

     * @return result code retutned by BS Service interface

     * @leave leaves from HandleResultL are propagated

     */

    IMPORT_C TInt ForwardActivationEventL( const TDesC8& aState, const TBool aEnter );

    /**

     * Handles back command

     *

     * @since S60 v3.2

     * @param aState state of application like view ids

     * @return result code retutned by BS Service interface

     * @leave leaves from HandleResultL are propagated

     */

    IMPORT_C TInt HandleBackCommandL( const TDesC8& aState, const TBool aCheckOnly = EFalse );

private:

    CGlxBackServiceWrapper();

    /**

     * 2nd phase constructor

     * @param aUid client application UID

     */

    void ConstructL( const TUid aUid );

    /**

     * Initializes BS Service

     * @param aUid client application UID

     * @leave KErrNotSupported or KErrArgument 

     *        (if arguments passed to BS Service are incorrect 

     *        or could not initialize BS)

     *        KErrNotFound (if there was no return value)

     */

    void InitializeL( const TUid aUid );

    /**

     * Handles the result of a LIW command

     * @return result code retutned by BS Service interface

     * @leave KErrNotSupported or KErrArgument 

     *        (if arguments passed to BS Service are incorrect)

     *        KErrNotFound (if there was no return value)

     */

    TInt HandleResultL();

private: // data

    /**

     * Liw Service Handler

     * Own.

     */

    CLiwServiceHandler* iServiceHandler;

    /**

     * BS Service interface returned by LIW

     * Own.

     */

    MLiwInterface* iBSInterface;

    /**

     * In param list

     * Not own.

     */

    CLiwGenericParamList* iInParamList;

    /**

     * Out param list

     * Not own.

     */

    CLiwGenericParamList* iOutParamList;

    };

#endif // C_GLX_BACKSERVICE_WRAPPER