/*

* Copyright (c) 2002 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:    LandmarksUi Content File -

*

*/

// INCLUDE FILES

#include "CLmkSelectorCache.h"

#include "CLmkUiItemBase.h"

#include "CLmkListProviderBase.h"

#include <lmkerrors.h>

// CONSTANTS

/// Unnamed namespace for local definitions

namespace {

const TInt KMaxCacheArraySize( 10 );

#if defined(_DEBUG)

_LIT( KPanicMsg, "CLmkSelectorCache" );

void Panic( TPanicCode aReason )

    {

    User::Panic( KPanicMsg, aReason );

    }

#endif

}  // namespace

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

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

// CLmkSelectorCache::CLmkSelectorCache

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

// might leave.

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

//

CLmkSelectorCache::CLmkSelectorCache( CLmkListProviderBase& aListProvider )

    : iListProvider( aListProvider )

    {

    }

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

// CLmkSelectorCache::ConstructL

// Symbian 2nd phase constructor can leave.

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

//

void CLmkSelectorCache::ConstructL()

    {

    iListProvider.AddObserverL( *this );

    }

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

// CLmkSelectorCache::NewL

// Two-phased constructor.

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

//

CLmkSelectorCache* CLmkSelectorCache::NewL(

    CLmkListProviderBase& aListProvider )

    {

    CLmkSelectorCache* self = new( ELeave ) CLmkSelectorCache( aListProvider );

    CleanupStack::PushL( self );

    self->ConstructL();

    CleanupStack::Pop();

    return self;

    }

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

// CLmkSelectorCache::~CLmkSelectorCache

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

//

CLmkSelectorCache::~CLmkSelectorCache()

    {

    iListProvider.RemoveObserver(*this);

    iItemList.ResetAndDestroy();

    iItemList.Close();

    }

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

// CLmkSelectorCache::ItemAtL

// Cache takes the ownership of item, therefore it receives a pointer,

// but passes a reference to the lb model

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

//

CLmkUiItemBase& CLmkSelectorCache::ItemAtL( TInt aIndex )

    {

    __ASSERT_DEBUG( aIndex >= 0, Panic( KLmkPanicInvalidIndex ) );

    TInt count = iItemList.Count();

    for ( TInt i( 0 ); i < count; ++i )

        {

        if ( aIndex == iItemList[i]->iIndex )

            {

            CLinkedItem* tmp = iItemList[i];

            CleanupStack::PushL( tmp );

            iItemList.Remove( i );

            User::LeaveIfError( iItemList.Insert( tmp, 0 ) );

            CleanupStack::Pop( tmp );

            return *(iItemList[0]->iPtr);

            }

        }

    __ASSERT_DEBUG( iListProvider.ItemCount() > aIndex ,

                                Panic(KLmkPanicInvalidIndex) );

    CLinkedItem* tmp = new(ELeave) CLinkedItem();

    CleanupStack::PushL( tmp );

    tmp->iIndex = aIndex;

    tmp->iPtr = iListProvider.ItemAtL( aIndex );

    User::LeaveIfError( iItemList.Insert( tmp, 0 ) );

    CleanupStack::Pop(); // tmp

    if ( iItemList.Count() > KMaxCacheArraySize )

        {

        delete iItemList[KMaxCacheArraySize];

        iItemList.Remove( KMaxCacheArraySize );

        }

    return *( iItemList[0]->iPtr );

    }

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

// CLmkSelectorCache::ItemCount

// ?implementation_description

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

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

//

TInt CLmkSelectorCache::ItemCount() const

    {

    // dummy implementation:

    return iListProvider.ItemCount();

    }

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

// CLmkSelectorCache::HandleListProviderEventL

// ?implementation_description

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

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

//

void CLmkSelectorCache::HandleListProviderEvent(

    TLmkListProviderEventType /*aEvent*/ )

    {

    iItemList.ResetAndDestroy();

    }

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

// CLmkSelectorCache::HandleListProviderError

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

//

void CLmkSelectorCache::HandleListProviderError( TInt /*aError*/ )

    {

    iItemList.ResetAndDestroy();

    }

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

// CLmkSelectorCache::CLinkedItem

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

//

CLmkSelectorCache::CLinkedItem::CLinkedItem()

    {

    }

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

// CLmkSelectorCache::~CLinkedItem

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

//

CLmkSelectorCache::CLinkedItem::~CLinkedItem()

    {

    delete this->iPtr;

    }

//  End of File