mtpfws/mtpfw/src/cmtpreferencemgr.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:11:40 +0200
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// Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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#include <mtp/cmtptypearray.h>
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#include <mtp/mtpdatatypeconstants.h>
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#include <mtp/mtpprotocolconstants.h>
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#include <mtp/mtptypessimple.h>
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#include "cmtpobjectstore.h"
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#include "cmtpreferencemgr.h"
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#include "dbutility.h"
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_LIT(KSQLReferenceTableName, "ReferenceStore");
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_LIT(KSQLReferenceIndexName, "ReferenceIndex");
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_LIT(KSQLCreateReferenceTableText,"CREATE TABLE ReferenceStore (HandleId UNSIGNED INTEGER, References LONG VARBINARY)");
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_LIT(KSQLCreateReferenceIndexText,"CREATE UNIQUE INDEX ReferenceIndex on ReferenceStore (HandleId)");	
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static const TInt KMTPReferenceGranularity = 5;
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// Maximum value to use for granularity 
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// This will result in 4KB of memory used (1024 * 4bytes) for reference SUID array
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static const TInt KMTPMaxGranularity = 1024;
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/**
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Two phase construction
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@param aObjectMgr	Reference to the object manager
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@return a pointer to the reference manager instance
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*/
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CMTPReferenceMgr* CMTPReferenceMgr::NewL(CMTPObjectStore& aObjectStore)
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	{
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	CMTPReferenceMgr* self = new (ELeave) CMTPReferenceMgr(aObjectStore);
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	CleanupStack::PushL(self);
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	self->ConstructL();
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	CleanupStack::Pop(self);
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	return self;
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	}
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/**
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Destructor
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*/	
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CMTPReferenceMgr::~CMTPReferenceMgr()
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	{
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	iBatched.Close();
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	}
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/**
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Provides an MTP array of the target object handles which are referenced 
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by the specified source object handle. A pointer to the MTP array is 
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placed on the cleanup stack.
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@param aFromHandle The MTP object handle of the source object from which 
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the references originate.
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@return The MTP reference target object handle array. Ownership IS transferred.
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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CMTPTypeArray* CMTPReferenceMgr::ReferencesLC(const TMTPTypeUint32& aFromHandle) const
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	{
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	return GetReferencesLC(aFromHandle.Value());
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	}
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/**
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Provides an SUID array of the target object SUIDs which are referenced by 
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the specified source object SUID. A pointer to the SUID array is 
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placed on the cleanup stack.
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@param aFromSuid The SUID of the source object from which the references 
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originate.
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@return The reference target object SUID array. Ownership IS transferred.
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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CDesCArray* CMTPReferenceMgr::ReferencesLC(const TDesC& aParentSuid) const
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	{
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	TUint32 handle =  iObjectStore.HandleL(aParentSuid);
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	return GetReferencesInDesLC(handle);
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	}
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/**
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Removes all object reference links in which the specified SUID represents 
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either the source or target reference object.
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@param aSuid The object SUID.
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::RemoveReferencesL(const TDesC& aSuid)
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	{
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	TUint32 handle =  iObjectStore.HandleL(aSuid);
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	RemoveReferencesL(handle);
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	}
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/**
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Creates an abstract reference linkage between the specified source and 
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target object SUIDs.
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@param aFromSuid The SUID of the source object from which the reference 
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originates.
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param aToSuid The SUID of the target object to which the reference is 
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made.
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::SetReferenceL(const TDesC& aFromSuid, const TDesC& aToSuid)
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	{
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	TUint32 fromHandle =  iObjectStore.HandleL(aFromSuid);
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	TUint32 toHandle =  iObjectStore.HandleL(aToSuid);
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	SetReferenceL(fromHandle, toHandle);
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	}
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/**
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Replaces the abstract reference links originating from the specified 
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source object handle with the specified set of target object SUIDs.
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@param aFromHandle The SUID of the source object from which the references 
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originate.
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@param aToSuids The reference target MTP object SUID array.
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::SetReferencesL(const TDesC& aParentSuid, const CDesCArray& aToSuids)
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	{
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	TInt count = aToSuids.Count();
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	if (count > 0)
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		{
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		TUint32 fromHandle =  iObjectStore.HandleL(aParentSuid);
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		// Limit granularity to something less or equal to KMTPMaxGranularity items
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		RArray<TUint> toHandles(Min(count, KMTPMaxGranularity));
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		CleanupClosePushL(toHandles);
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		for(TInt i = 0; i < count; i++)
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			{
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			TUint32 toHandle =  iObjectStore.HandleL(aToSuids[i]);
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			toHandles.Append(toHandle);
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			}	
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		SetReferencesL(fromHandle, toHandles);	
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		CleanupStack::PopAndDestroy(&toHandles);
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		}
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	}
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/**
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Constructor/.
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*/    
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CMTPReferenceMgr::CMTPReferenceMgr(CMTPObjectStore& aObjectStore):
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	iObjectStore(aObjectStore)
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	{
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	}
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/**
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second-phase construction
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::ConstructL()
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	{
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    iDatabase   = &iObjectStore.Database();
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	if(!DBUtility::IsTableExistsL(*iDatabase, KSQLReferenceTableName))
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		{
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		CreateTableL();
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		}
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	if(!DBUtility::IsIndexExistsL(*iDatabase, KSQLReferenceTableName, KSQLReferenceIndexName))
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		{
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		CreateIndexL();
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		}
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	iBatched.Open(*iDatabase, KSQLReferenceTableName, RDbRowSet::EUpdatable);
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	iBatched.SetIndex( KSQLReferenceIndexName ); 
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	}
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/**
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Create the reference table in the database
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::CreateTableL()
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	{
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	User::LeaveIfError(iDatabase->Execute(KSQLCreateReferenceTableText));	
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	}
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/**
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Create the index in the reference table
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::CreateIndexL()
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	{
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	User::LeaveIfError(iDatabase->Execute(KSQLCreateReferenceIndexText));	
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	}
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/**
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Get reference on the object identified by aIdentifier
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@param aIdentifier	The 64bit internal object identifier
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@return The array containing the handles of the references
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@leave One of the system wide error codes, if a processing failure occurs.
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*/
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CMTPTypeArray* CMTPReferenceMgr::GetReferencesLC(TUint aHandle) const
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	{
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	RArray<TUint> toHandles;
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	CleanupClosePushL(toHandles);
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	GetReferencesL(aHandle, toHandles);
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	CMTPTypeArray* mtpReferenceArray = CMTPTypeArray::NewLC(EMTPTypeAUINT32);	
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	mtpReferenceArray->AppendL(toHandles);
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	CleanupStack::Pop(mtpReferenceArray);
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	CleanupStack::PopAndDestroy(&toHandles);
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	CleanupStack::PushL(mtpReferenceArray);
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	return mtpReferenceArray;
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	}
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/**
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Get reference on the object identified by aIdentifier
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@param aIdentifier	The 64bit internal object identifier
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@return The array containing the suids of the references
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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CDesCArray*	 CMTPReferenceMgr::GetReferencesInDesLC(TUint aHandle) const
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	{
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	RArray<TUint> toHandles(KMTPReferenceGranularity);
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	CleanupClosePushL(toHandles);
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	GetReferencesL(aHandle, toHandles);	
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	const TInt count = toHandles.Count();
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	CDesCArray* mtpReferenceArray = new (ELeave) CDesCArrayFlat((count==0) ? 1 : count);
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	CleanupStack::PushL(mtpReferenceArray);
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   229
	
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	for(TInt i = 0; i < count; i++)
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		{
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		const TDesC& suid = iObjectStore.ObjectSuidL(toHandles[i]);
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		if(suid.Length())
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			{
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			mtpReferenceArray->AppendL(suid);
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			}
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		}
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	CleanupStack::Pop(mtpReferenceArray);
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	CleanupStack::PopAndDestroy(&toHandles);
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	CleanupStack::PushL(mtpReferenceArray);
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	return mtpReferenceArray;		
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	}
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/**
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Get references on the object identified by aIdentifier
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@param aIdentifier	The 64bit internal object identifier
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@param aReferences	The reference array, on return, containing the 64bit internal identifiers of the references
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::GetReferencesL(TUint aHandle, RArray<TUint>& aToHandles) const
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	{
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	TUint32 temp = 0;
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	TBool   needToUpdate = EFalse;
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	aToHandles.Reset();
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	if(iBatched.SeekL(aHandle))
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		{
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		iBatched.GetL();
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	    RDbColReadStream readStream;     
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        readStream.OpenLC(iBatched,2);
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        TInt count = readStream.ReadInt32L();
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        while(count--)
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        	{
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        	temp = readStream.ReadUint32L();
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			if(iObjectStore.ObjectExistsL(temp))
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	        	aToHandles.AppendL(temp);
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			else
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				needToUpdate = ETrue;
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        	}
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        CleanupStack::PopAndDestroy(&readStream);
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   272
		
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		if(needToUpdate)
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			{//Something has been deleted. Write it back to Reference list
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			iBatched.UpdateL();
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			RDbColWriteStream writeStream;	   
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			writeStream.OpenLC(iBatched,2);
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   278
			
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			count = aToHandles.Count();
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			writeStream.WriteInt32L(count);
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			for(TInt i = 0; i < count; i++)
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				{
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				writeStream.WriteUint32L(aToHandles[i]);
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				}
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			writeStream.CommitL(); 
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			CleanupStack::PopAndDestroy(&writeStream);
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			iBatched.PutL();			
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			}
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   289
		
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		}	
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	return;
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   292
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	}
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   294
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   295
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   296
/**
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   297
Remove reference on the object identified by aIdentifier
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@param aIdentifier	The 64bit internal object identifier
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::RemoveReferencesL(TUint aHandle)
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	{
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	if(iBatched.SeekL(aHandle))
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		{
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		iBatched.DeleteL();
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		IncTranOpsNumL();
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		}
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	}
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   309
/**
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Set reference on the object identified by aFromIdentifier
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@param aFromIdentifier	The 64bit internal object identifier of the source object
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@param aToIdentifier	The 64bit internal object identifier of the referenced object
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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void CMTPReferenceMgr::SetReferenceL(TUint aFromHandle, TUint aToHandle)
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	{
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	RArray<TUint> aToHandleArray(1);
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	CleanupClosePushL(aToHandleArray);
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	aToHandleArray.AppendL(aToHandle);
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	SetReferencesL(aFromHandle, aToHandleArray);
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   321
	CleanupStack::PopAndDestroy(&aToHandleArray);
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	}
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   323
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   324
/**
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   325
Replaces the abstract reference links originating from the specified 
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source object handle with the specified set of target object handles.
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   327
@param aFromHandle The handle of the source object from which the references 
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   328
originate.
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@param aToHandles The reference target object handle array.
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@leave One of the system wide error codes, if a processing failure occurs.
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*/	
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   332
void CMTPReferenceMgr::SetReferencesL(const TMTPTypeUint32& aFromHandle, const CMTPTypeArray& aToHandles)
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   333
{
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   334
	RArray<TUint> tempArray;
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   335
	CleanupClosePushL(tempArray);
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   336
	TInt count = aToHandles.NumElements();
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   337
	for(TInt i = 0; i < count; i++)
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   338
		{
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   339
		tempArray.Append(aToHandles.ElementUint(i));
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   340
		}	
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   341
	SetReferencesL(aFromHandle.Value(), tempArray);
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   342
	CleanupStack::PopAndDestroy(&tempArray);
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   343
}
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   344
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parents:
diff changeset
   345
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parents:
diff changeset
   346
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   347
/**
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   348
Set references on the object identified by aFromIdentifier
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   349
@param aFromIdentifier	The 64bit internal object identifier of the source object
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   350
@param aToIdentifiers	The 64bit internal object identifiers of the referenced objects
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   351
@leave One of the system wide error codes, if a processing failure occurs.
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   352
*/   	
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   353
void CMTPReferenceMgr::SetReferencesL(TUint aHandle, const RArray<TUint>& aToHandles)
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   354
	{
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   355
	if(iBatched.SeekL(aHandle))
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   356
		{
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   357
		iBatched.UpdateL();		
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   358
		}
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   359
	else
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parents:
diff changeset
   360
		{
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   361
		iBatched.InsertL();		
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   362
		}
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parents:
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   363
	
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   364
	iBatched.SetColL(1, aHandle);
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parents:
diff changeset
   365
	
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   366
	RDbColWriteStream writeStream;     
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   367
    writeStream.OpenLC(iBatched,2);
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parents:
diff changeset
   368
    
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   369
    const TInt count = aToHandles.Count();
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parents:
diff changeset
   370
    writeStream.WriteInt32L(count);
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parents:
diff changeset
   371
    for(TInt i = 0; i < count; i++)
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parents:
diff changeset
   372
        {
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diff changeset
   373
        writeStream.WriteUint32L(aToHandles[i]);
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parents:
diff changeset
   374
        }
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parents:
diff changeset
   375
    writeStream.CommitL(); 
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parents:
diff changeset
   376
    CleanupStack::PopAndDestroy(&writeStream);
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parents:
diff changeset
   377
	iBatched.PutL();			
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parents:
diff changeset
   378
	IncTranOpsNumL();
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parents:
diff changeset
   379
	}
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parents:
diff changeset
   380
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parents:
diff changeset
   381
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parents:
diff changeset
   382
void CMTPReferenceMgr::IncTranOpsNumL()
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parents:
diff changeset
   383
	{
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parents:
diff changeset
   384
	iObjectStore.IncTranOpsNumL();
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parents:
diff changeset
   385
	}
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parents:
diff changeset
   386
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parents:
diff changeset
   387
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parents:
diff changeset
   388
/**
d0791faffa3f Revision: 201003
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parents:
diff changeset
   389
Verify if every reference is pointing to a valid object. If the referenced object does not exist,
d0791faffa3f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   390
delete the object from the reference array.
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parents:
diff changeset
   391
@param aReference	The 64bit internal object identifiers of the referenced objects
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parents:
diff changeset
   392
@leave One of the system wide error codes, if a processing failure occurs.
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parents:
diff changeset
   393
*/
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parents:
diff changeset
   394
/*
d0791faffa3f Revision: 201003
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parents:
diff changeset
   395
void CMTPReferenceMgr::AdjustReferencesL(RArray<TUint32>&aHandles) const
d0791faffa3f Revision: 201003
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parents:
diff changeset
   396
	{
d0791faffa3f Revision: 201003
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parents:
diff changeset
   397
	TInt count = aHandles.Count();
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parents:
diff changeset
   398
	while(count--)
d0791faffa3f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   399
		{
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parents:
diff changeset
   400
		if(!iObjectStore.ObjectExistsL(aHandles[count]))
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   401
			{
d0791faffa3f Revision: 201003
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parents:
diff changeset
   402
			aHandles.Remove(count);
d0791faffa3f Revision: 201003
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parents:
diff changeset
   403
			}
d0791faffa3f Revision: 201003
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parents:
diff changeset
   404
		}
d0791faffa3f Revision: 201003
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parents:
diff changeset
   405
	}
d0791faffa3f Revision: 201003
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parents:
diff changeset
   406
	*/
d0791faffa3f Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   407