/*

* 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:  Command handler for SSY <--> Sensor messages

*

*/

#ifndef SSYREFERENCECMDHANDLER_H

#define SSYREFERENCECMDHANDLER_H

#include <e32base.h>

#include "ssyreferenceconfig.h"

// FORWARD DECLARATIONS

class CSsyReferenceChannel;

/**

 *  Command handler class for handling commands of one channel. Each opened 

 *  channel has its own instance of this class

 *

 *  @lib ssyreferenceplugin.lib

 *  @since S60 5.0

 */

class CSsyReferenceCmdHandler : public CActive

    {

public:

    /**

     * Two-phase constructor

     *

     * @since S60 5.0

     * @param[in] aSsyChannel Reference to SSY Channel instance.

     * @return CSsyReferenceCmdHandler* Pointer to created CSsyReferenceCmdHandler object

     */

    static CSsyReferenceCmdHandler* NewL( CSsyReferenceChannel& aSsyChannel );

    /**

     * Virtual destructor

     *

     * @since S60 5.0

     */

    virtual ~CSsyReferenceCmdHandler();

// from base class CSsyControl

    /**

     * Processes command specified in param aMessage. 

     *

     * @since S60 5.0

     * @param[in] aMessage Contains command information to process

     * @return void Symbian OS error code

     */

    TInt ProcessCommand( TSsyReferenceMsg aMessage );

    /**

     * From CActive

     */

    void RunL();

    /**

     * From CActive

     */

    void DoCancel();

    /**

     * From CActive

     */

    TInt RunError( TInt aError );

    /**

     * Callback function for DataItem generation

     */

    static TInt DataItemCallback( TAny* aThis );

    /**

     * Handles data item generation. Called from DataItemCallback

     */

    TInt GenerateChannelDataItem();

private:

    /**

     * C++ constructor.

     *

     * @since S60 5.0

     * @param[in] aSsyChannel Reference to SSY Channel instance.

     */

    CSsyReferenceCmdHandler( CSsyReferenceChannel& aSsyChannel );

    /**

     * Symbian 2nd phase constructor.

     */

    void ConstructL();

    /**

     * Makes synchronous calls asynchronous

     */

    void IssueRequest( TInt aError = KErrNone );

    /**

     * Sends response to channel

     */

    void SendResponse( TInt aError = KErrNone );

private: // data

    /**

     * Reference to SSY Conrtol to send responses for commands

     */

    CSsyReferenceChannel& iSsyChannel;

    /**

     * Pointer to currently processing message

     */

    TSsyReferenceMsg* iMessage;

    /**

     * Data item array

     */

    TSsyRefDataItemArray iDataItemArray;

    /**

     * Pointer to next item to generate in iDataItemArray

     */

    TInt iDataItemPtr;

    /**

     * Periodic timer for generating channel data

     */

    CPeriodic* iTimer;

    };

#endif // SSYREFERENCECMDHANDLER_H

// End of file