// Copyright (c) 2005-2009 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 "caliteratorimpl.h"

#include "calclient.h"

#include "agmentry.h"

#include "calsessionimpl.h"

CCalIteratorImpl::CCalIteratorImpl(CCalSessionImpl& aSessionImpl)

	:iCalSessionImpl(aSessionImpl), iServer(aSessionImpl.Server())

	{

	iCalSessionImpl.IncrementReferenceCount();

	}

CCalIteratorImpl::~CCalIteratorImpl()

	{

	iCalSessionImpl.DecrementReferenceCount();

	delete iGuid;

	}

const TDesC8& CCalIteratorImpl::FirstL()

	{

	if (iServer.CreateEntryIteratorL(iCalSessionImpl.FileId()))

		{

		iFileEntry = ETrue; //file contains an entry

		FindUidL();

		if(iGuid)

			{

			return *iGuid;

			}

		else

			{

			NextL();

			}

		__ASSERT_ALWAYS(iGuid, User::Leave(KErrCorrupt));// At least there should be one entry which holds the guid

		return *iGuid;

		}

	else

		{//There is no entries - the file is empty -

		iFileEntry = EFalse;

		return KNullDesC8();

		} 

	}

/** 

Moves the entry iterator to the next entry which is a parent (parent and its children have the same Uid) and retrive its Uid. . 

@capability None

@return a descriptor which contains the Uid of the current entry. The return value can be a KNullDesC8 if there is no more parent entry in the file. 

*/

const TDesC8& CCalIteratorImpl::NextL()

	{

	if (!iFileEntry)

		{

		User::Leave(KErrCorrupt);

		}

	TBool available = iServer.EntryIteratorNextL(iCalSessionImpl.FileId());

	while (available)

		{

		FindUidL();

		if(iGuid)

			{

			return *iGuid;

			}

		available = iServer.EntryIteratorNextL(iCalSessionImpl.FileId());

		}

	return KNullDesC8();

	}

void CCalIteratorImpl::FindUidL()

	{/*

	 Update the iGuid which hols the guid of the current entry.

	 The descriptor HBufC* iGid may be one of the following values:

	 1. Contains the guid of a GS parent entry.

	 2. Null if it is a GS child entry

	 3. Unique id (converted into descriptor) if it is not a GS entry.

	 */

	delete iGuid;

	iGuid = NULL;

	CAgnEntry* entry = iServer.FetchEntryByIteratorL(iCalSessionImpl.FileId());

	// sanity check: if NULL something went wrong with the indexes

	__ASSERT_ALWAYS(entry, User::Leave(KErrGeneral));

	CleanupStack::PushL(entry);

	if(entry->GsDataType()==CGsData::EParent)

		{

		iGuid = entry->Guid().AllocL();

		}

	CleanupStack::PopAndDestroy(entry);

	}