systemswstubs/ssyreference/inc/ssyreferencechanneldataprovider.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 07 Sep 2010 08:19:48 +0300
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/*
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* Copyright (c) 2006-2008 Nokia Corporation and/or its subsidiary(-ies). 
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Reference implementation of SSY Channel Data Provider interface
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*
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*/
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#ifndef SSYREFERENCECHANNELDATAPROVIDER_H
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#define SSYREFERENCECHANNELDATAPROVIDER_H
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#include <ssychanneldataprovider.h>
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class CSsyReferenceChannel;
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class TSsyReferenceMsg;
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/**
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 *  Channel data provider implementation.
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 *
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 *  @lib ssyreferenceplugin.lib
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 *  @since S60 5.0
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 */
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class CSsyReferenceChannelDataProvider : public CBase, public MSsyChannelDataProvider
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    {
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public:
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    /**
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     * Two-phase constructor
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     *
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     * @since S60 5.0
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     * @param[in] aChannel Reference to channel this provider belongs to
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     * @return CSsyReferenceChannelDataProvider* Pointer to created CSsyReferenceControl object
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     */
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    static CSsyReferenceChannelDataProvider* NewL( CSsyReferenceChannel& aChannel );
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    /**
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     * Virtual destructor
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     *
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     * @since S60 5.0
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     */
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    virtual ~CSsyReferenceChannelDataProvider();
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// from base class MSsyChannelDataProvider
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    /**
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     * From MSsyChannelDataProvider
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     * Starts asynchronous data listening. Multiple OpenChannel()-requests
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     * can be active for different channels at the same time.
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     *
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     * @since S60 5.0
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     * @param[in] aBuffer Pointer to a data buffer 
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     * @param[in] aCount Indicates data buffer size as a count of the data objects.
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     */
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    void StartChannelDataL( const TSensrvChannelId aChannelId, TUint8* aBuffer, TInt aCount );
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    /**
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     * From MSsyChannelDataProvider
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     * Stops asynchronous data listening. The data buffer is not valid after call of 
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     * this function.
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     *
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     * @since S60 5.0
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     */
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    void StopChannelDataL( const TSensrvChannelId aChannelId );
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    /**
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     * From MSsyChannelDataProvider
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     * Forces SSY to call BufferFilled() regardless of how many data items have been
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     * written to buffer. Even if no data items have yet been written, BufferFilled()
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     * must be called.
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     *
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     * @since S60 5.0
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     */
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    void ForceBufferFilledL( const TSensrvChannelId aChannelId );
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    /** 
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    * Returns a pointer to a specified interface - to allow future extension
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    * of this class without breaking binary compatibility
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    *
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    * @since S60 5.0
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    * @param aInterfaceUid Identifier of the interface to be retrieved
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    * @param aInterface A reference to a pointer that retrieves the specified interface.
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    */
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    void GetChannelDataProviderInterfaceL( TUid aInterfaceUid, TAny*& aInterface );
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    /**
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     * Channel data item received
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     *
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     * @param[in] aMessage Contains channel item
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     */
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    void ChannelDataReceivedL( TSsyReferenceMsg* aMessage );
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private:
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    /**
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     * C++ constructor.
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     * @param[in] aChannel Reference to channel this provider belongs to
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     */
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    CSsyReferenceChannelDataProvider( CSsyReferenceChannel& aChannel );
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    /**
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     * Symbian 2nd phase constructor.
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     */
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    void ConstructL();
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    /**
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     * Adds data into buffer. 
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     *
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     *@param[in] aData Data to add to buffer
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     *@param[in] aSize Size of data
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     */
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    void AddDataToBuffer( TUint8* aData, const TInt aSize );
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    /**
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     * Sends BufferFilled notification to MSsyCallback
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     */
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    void SendBufferFilled();
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private: // data
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    /**
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     * Reference to channel for which this provider belongs to
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     */
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    CSsyReferenceChannel& iChannel;
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    /**
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     * Pointer to data buffer in Sensor Server side
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     */
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    TUint8* iDataBuffer;
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    /**
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     * Maximum requested data items
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     */
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    TInt iMaxCount;
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    /**
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     * Number of items in buffer
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     */
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    TInt iDataCount;
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    };
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#endif // SSYREFERENCECHANNELDATAPROVIDER_H