commsfwtools/preparedefaultcommsdatabase/src/MetaDatabaseVisitor.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 21 Jun 2010 17:02:22 +0300
branchRCL_3
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Revision: 201025 Kit: 2010125
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// Copyright (c) 2004-2009 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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// Implementation of visitor classes to process MetaDatabase objects
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// 
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//
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/**
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 @file 
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 @internalTechnology
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*/
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#ifdef SYMBIAN_ENABLE_SPLIT_HEADERS
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#include <commsdattypesv1_1_partner.h>
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#endif
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#include "CommsDatInternalDefs.h"
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#include "MetaDatabaseVisitor.h"
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#include "CommsDat.h"
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using namespace CommsDat;
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using namespace Meta;
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//
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// These functions don't need to be specialised in derived templated visitors
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// 
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TMDBVisitorBase::TMDBVisitorBase()
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: Meta::MMetaType(), iMaxLength(0), iOwner(0), iElementId(0)
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    {   
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    }
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TMDBVisitorBase::TMDBVisitorBase(TMDBElementId* aElementId)
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: Meta::MMetaType(), iMaxLength(0), iOwner(0), iElementId(aElementId) 
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    {   
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    }
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TMDBVisitorBase::~TMDBVisitorBase()
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/*
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Nothing to delete
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*/
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    {
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    }
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void TMDBVisitorBase::SetElementId(TMDBElementId* aElementId)
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    {
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    if (aElementId)
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        {
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            iElementId = aElementId;
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        }
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    }
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void TMDBVisitorBase::SetElementId(TMDBElementId aElementId)
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    {
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    if (aElementId)
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        {
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            *iElementId = aElementId;
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        }
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    }
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void TMDBVisitorBase::ResetElementId(TInt aRecId)
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	{
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	*iElementId &= ~KCDChangedFlag;
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	*iElementId &= (~ECDHidden);
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	if (aRecId)
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		{
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		*iElementId |= aRecId;
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		}
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	}
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TBool TMDBVisitorBase::IsFieldLoaded()
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/*
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Has the value been changed by the caller?
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@internalComponent
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*/  { 
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	if (iElementId)
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    	{
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    	return( (*iElementId & KCDNotNullFlag) == KCDNotNullFlag );
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    	}
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    return false;
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    } 
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void TMDBVisitorBase::FieldLoaded()
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/*
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The value has been loaded from the db
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@internalComponent
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*/  { 
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	if (iElementId)
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    	{
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    		*iElementId |= KCDNotNullFlag;
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            *iElementId &= ~KCDChangedFlag;
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    	}
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    } 
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void TMDBVisitorBase::SetFieldNull()
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/*
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The value is not set in the db
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@internalComponent
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*/  { 
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	if (iElementId)
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    	{
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    		*iElementId &= ~KCDNotNullFlag;
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            *iElementId &= ~KCDChangedFlag;
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    	}
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    } 
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void TMDBVisitorBase::Change()
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/*
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set the changed flag in element id
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*/
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    { 
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    if (iElementId)
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    	{
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    		*iElementId |= KCDChangedFlag;
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    	}
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    } 
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void TMDBVisitorBase::Sync()
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/*
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switch off the changed flag in element id
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*/
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    { 
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    if (iElementId)
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    	{
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    		*iElementId &= ~KCDChangedFlag;
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    	}
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    }
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TUint32 TMDBVisitorBase::TypeId() 
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    {
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    if (iElementId)
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    	{
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    		return *iElementId & KCDMaskShowType;
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    	}
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    	return 0;
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    }
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TUint32 TMDBVisitorBase::ElementId()
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    {
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    if (iElementId)
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    	{
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    		return *iElementId;
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    	}
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    	return 0;
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    }
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void TMDBVisitorBase::SetMaxLength(TInt aLength)
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    {
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    iMaxLength = aLength;
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    }
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void TMDBVisitorBase::SetOwner(CMDBElement* aOwner)
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/*
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Set the owner of this element as is needed for callback.
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If necessary set the element id or amend it with info from the owner
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@internalComponent
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*/  
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	{ 
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    iOwner = aOwner; 
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    if (! iElementId)
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        {
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        iElementId = aOwner->Data();
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        }
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	else
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		{
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		*iElementId |= aOwner->ElementId() & (KCDMaskShowRecordId | KCDMaskShowAttributes);
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		}
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    }
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TInt TMDBVisitorBase::GetL(CMDBSessionImpl* /*aSession*/) 
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/*
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Retrieve this element from the database
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not all sub-classes need to provide this function.
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*/
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    {
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    return KErrNotSupported;
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    }
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TBool CompareByRecordId(const TUint32& aFirst, const TUint32& aSecond)
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// Utility for RArray Find
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    {
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    return( (aFirst & KCDMaskShowRecordId) == (aSecond & KCDMaskShowRecordId) );
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    }
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void TMDBVisitorBase::FindRecordsUsingTemplateL(CMDBSessionImpl* aSession, RArray<TUint32>& aRecordIds, RArray<TUint32>& aCandidateIds)
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// because entry exists in template, must include all records that don't have any entries
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    {
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    // First find all record ids by looking at placeholders
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    TUint32 mask = KCDMaskShowType | aSession->GetReadAttributeMask();
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    TInt err = aSession->StorageL()->FindL(ElementId() | 0x80000000 | KCDMaskShowFieldType, mask | 0x80000000, aRecordIds);
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    if (err != KErrNone)
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        {
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        User::Leave(err); // at this stage know there is something there
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        }
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    RArray<TUint32> fieldIds;
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    CleanupClosePushL(fieldIds);
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    // then find all fields not using template
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    err = aSession->StorageL()->FindL(ElementId() & KCDMaskHideAttrAndRes, mask, fieldIds);
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    // The fields not found are the records using the template so add the difference to the list of candidates
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    for ( TInt i = 0; i < (aRecordIds.Count() - 1); i++ ) // don't ever want to include the table id.
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        {
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        if ( KErrNotFound == fieldIds.Find(aRecordIds[i], CompareByRecordId) )
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            {
48
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            aCandidateIds.AppendL(aRecordIds[i]);
0
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            }
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        }
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    CleanupStack::PopAndDestroy(&fieldIds); 
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    }
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//EOF