/*

* Copyright (c) 2006-2006 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: An observer and I/F class to observe Publish and Subscribe key changes.

*

*/

// INCLUDE FILES

#include "pim_trace.h"

#include "PropertyObserver.h"

// ============================ MEMBER FUNCTIONS ===============================

// -----------------------------------------------------------------------------

// CPropertyObserver::CPropertyObserver

// C++ default constructor can NOT contain any code, that

// might leave.

// -----------------------------------------------------------------------------

//

CPropertyObserver::CPropertyObserver(MPropertyChangeHandler& aHandler, TUid aCategory, TUint aKey)

: CActive( CActive::EPriorityStandard ),

  iCategory( aCategory ),

  iKey( aKey ),

  iHandler( aHandler )

{

    TRACE_ENTRY_POINT;

    TRACE_EXIT_POINT;

}

// -----------------------------------------------------------------------------

// CPropertyObserver::ConstructL

// Symbian 2nd phase constructor can leave.

// -----------------------------------------------------------------------------

//

void CPropertyObserver::ConstructL(void)

{

    TRACE_ENTRY_POINT;

    CActiveScheduler::Add( this );

    User::LeaveIfError( iProperty.Attach( iCategory, iKey ) );

    NotifyCurrentValue(); // for initial value

    // Start observing...

    Subscribe();

    TRACE_EXIT_POINT;

}

// -----------------------------------------------------------------------------

// CPropertyObserver::NewL

// Two-phased constructor.

// -----------------------------------------------------------------------------

//

CPropertyObserver* CPropertyObserver::NewL(MPropertyChangeHandler& aHandler, TUid aCategory, TUint aKey)

{

    TRACE_ENTRY_POINT;

    CPropertyObserver* self = new( ELeave )CPropertyObserver( aHandler, aCategory, aKey );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop( self );

    TRACE_EXIT_POINT;

    return self;

}

// Destructor

CPropertyObserver::~CPropertyObserver()

{

    TRACE_ENTRY_POINT;

    Deque();

    iProperty.Cancel();

    iProperty.Close();

    TRACE_EXIT_POINT;

}

// -----------------------------------------------------------------------------

// CPropertyObserver::RunL

// ?implementation_description

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CPropertyObserver::RunL(void)

{

    TRACE_ENTRY_POINT;

    ASSERT( !(iStatus.Int()) );

    if( iStatus.Int() == KErrNone )

    {

        Subscribe();

        NotifyCurrentValue();

    }

    TRACE_EXIT_POINT;

}

// -----------------------------------------------------------------------------

// CPropertyObserver::DoCancel

// ?implementation_description

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CPropertyObserver::DoCancel(void)

{

    TRACE_ENTRY_POINT;

    iProperty.Cancel();

    TRACE_EXIT_POINT;

}

// -----------------------------------------------------------------------------

// CPropertyObserver::Subscribe

// ?implementation_description

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CPropertyObserver::Subscribe(void)

{

    TRACE_ENTRY_POINT;

    iProperty.Subscribe( iStatus );

    SetActive();

    TRACE_EXIT_POINT;

}

// -----------------------------------------------------------------------------

// CPropertyObserver::NotifyCurrentValue

// ?implementation_description

// (other items were commented in a header).

// -----------------------------------------------------------------------------

//

void CPropertyObserver::NotifyCurrentValue(void)

{

    TRACE_ENTRY_POINT;

    TInt value;

    if( iProperty.Get( iCategory, iKey, value ) == KErrNone )

    {

        iHandler.HandlePropertyChange( iCategory, iKey, value );

    }

    TRACE_EXIT_POINT;

}

// End of File