/*

 * Copyright (c) 2010 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:  Declarations for class TMSPubSubListener

 *

 */

#ifndef TMSPUBSUBLISTENER_H

#define TMSPUBSUBLISTENER_H

//  INCLUDES

#include <e32base.h>

#include <e32std.h>

#include <e32property.h>

namespace TMS {

// FORWARD DECLARATIONS

class TMSPubSubObserver;

// CLASS DECLARATION

/**

 *  RProperty poller.

 */

class TMSPubSubListener : public CActive

    {

public:

    // Constructors and destructor

    /**

     * Two-phased constructor.

     * @param aUid the Uid to use

     * @param aKey item's key

     * @param aObserver callback interface for notification

     * @return instance of CSPPubSubListener

     */

    static TMSPubSubListener* NewL(const TUid aUid, const TInt aKey,

            TMSPubSubObserver* aObserver);

    /**

     * Destructor.

     */

    virtual ~TMSPubSubListener();

public:

    // New functions.

    /**

     * Gets integer value from P & S.

     * @param aVal a value in return

     * @return error code

     */

    TInt Get(TInt& aVal);

    /**

     * Gets 8 bit string value from P&S.

     * @param aVal a value in return

     * @return error code

     */

    TInt Get(TDes8& aVal);

    /**

     * Gets 16 bit descriptor value from P&S.

     * @param aVal a value in return

     * @return error code

     */

    TInt Get(TDes16& aVal);

private:

    // New functions.

    /**

     * Starts the listening (RunL).

     */

    void StartListening();

private:

    // From CActive.

    /** @see CActive::RunL */

    virtual void RunL();

    /** @see CActive::Cancel */

    virtual void DoCancel();

    /** @see CActive::RunError */

    virtual TInt RunError(TInt aError);

private:

    /**

     * Constructor of the listener.

     * @param aUid the Uid to use

     * @param aKey item's key

     * @param aObserver callback interface for notification

     */

    TMSPubSubListener(const TUid aUid, TInt aKey,

	        TMSPubSubObserver* aObserver);

    /**

     * By default Symbian 2nd phase constructor is private.

     */

    void ConstructL();

private:

    // Data

    /** UID of the monitored item. */

    TUid iUid;

    /** ID of the monitored item. */

    TInt iId;

    /** Property to subscribe to. */

    RProperty iProperty;

    /** Observer for PS notifications. */

    TMSPubSubObserver* iObserver;

    };

} //namespace TMS

#endif // TMSPUBSUBLISTENER_H

// End of File