// 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;

 	}