sl@0: // Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #include "CacheBase.h"
sl@0: 
sl@0: /**
sl@0: Constructor
sl@0: Initialized the iCachedItems array with granularity 8 and an offset to iHandle in TCacheEntry,
sl@0: which will be used to find specific entries later.
sl@0: */
sl@0: CCacheBase::CCacheBase() : iCachedItems(8, _FOFF(TCacheEntry, iHandle))
sl@0: 	{
sl@0: 	
sl@0: 	}
sl@0: 	
sl@0: CCacheBase::~CCacheBase()
sl@0: 	{
sl@0: 	for(TInt i = 0; i < iCachedItems.Count(); i++)
sl@0: 		{
sl@0: 		delete iCachedItems[i].iCachedItem;
sl@0: 		}
sl@0: 		
sl@0: 	iCachedItems.Reset();	
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: Begins an update of the cache.
sl@0: */
sl@0: void CCacheBase::BeginUpdate()
sl@0: 	{
sl@0: 	// Sets all cached items to not used
sl@0: 	for(TInt i = 0; i < iCachedItems.Count(); i++)
sl@0: 		{
sl@0: 		iCachedItems[i].iIsUsed = EFalse;
sl@0: 		}		
sl@0: 	}
sl@0: 
sl@0: /**
sl@0: End an update of the cache.
sl@0: */
sl@0: void CCacheBase::EndUpdate()
sl@0: 	{
sl@0: 	// Removes all cached items that are not used
sl@0: 	for(TInt i = 0; i < iCachedItems.Count(); i++)
sl@0: 		{
sl@0: 		if(!iCachedItems[i].iIsUsed)
sl@0: 			{
sl@0: 			delete iCachedItems[i].iCachedItem;
sl@0: 			iCachedItems.Remove(i--);
sl@0: 			}			
sl@0: 		}
sl@0: 	// coverity[extend_simple_error]	
sl@0: 	}
sl@0: 	
sl@0: /**
sl@0: Returns an item from the cache corresponding to a specific handle.
sl@0: 
sl@0: @param aHandle A handle to match against an item in the cache.
sl@0: @return The item that matches the handle provided as a parameter.
sl@0: */
sl@0: const CBase* CCacheBase::Resolve(TInt aHandle)
sl@0: 	{
sl@0: 	TCacheEntry entry(aHandle);
sl@0: 	TInt index = iCachedItems.FindInUnsignedKeyOrder(entry);
sl@0: 	
sl@0: 	if(index != KErrNotFound)
sl@0: 		return iCachedItems[index].iCachedItem;		
sl@0: 	else
sl@0: 		return NULL;
sl@0: 	}
sl@0: 
sl@0: