// Copyright (c) 2006-2009 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:

//

#include "CacheBase.h"

/**

Constructor

Initialized the iCachedItems array with granularity 8 and an offset to iHandle in TCacheEntry,

which will be used to find specific entries later.

*/

CCacheBase::CCacheBase() : iCachedItems(8, _FOFF(TCacheEntry, iHandle))

	{

	}

CCacheBase::~CCacheBase()

	{

	for(TInt i = 0; i < iCachedItems.Count(); i++)

		{

		delete iCachedItems[i].iCachedItem;

		iCachedItems[i].iCachedItem = NULL;

		}

	iCachedItems.Reset();	

	}

/**

Begins an update of the cache.

*/

void CCacheBase::BeginUpdate()

	{

	// Sets all cached items to not used

	for(TInt i = 0; i < iCachedItems.Count(); i++)

		{

		iCachedItems[i].iIsUsed = EFalse;

		}		

	}

/**

End an update of the cache.

*/

void CCacheBase::EndUpdate()

	{

	// Removes all cached items that are not used

	for(TInt i = 0; i < iCachedItems.Count(); i++)

		{

		if(!iCachedItems[i].iIsUsed)

			{

			delete iCachedItems[i].iCachedItem;

			iCachedItems.Remove(i--);

			}			

		}

	}

/**

Returns an item from the cache corresponding to a specific handle.

@param aHandle A handle to match against an item in the cache.

@return The item that matches the handle provided as a parameter.

*/

const CBase* CCacheBase::Resolve(TInt aHandle)

	{

	TCacheEntry entry(aHandle);

	TInt index = iCachedItems.FindInUnsignedKeyOrder(entry);

	if(index != KErrNotFound)

		return iCachedItems[index].iCachedItem;		

	else

		return NULL;

	}