harvester/composerplugins/imagecomposer/src/locationrelationobserver.cpp
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/*
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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:  Image Composer's listener for changes in db location relations
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*
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*/
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#include <mdelogiccondition.h>
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#include <mdequery.h>
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#include "locationrelationobserver.h"
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#include "harvesterlog.h"
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#include "mdeconstants.h"
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#include "composerimageplugin.h"
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using namespace MdeConstants;
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CLocationRelationObserver::CLocationRelationObserver() :
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    iDefaultNamespace( NULL ), iSession( NULL ), iComposer( NULL ),
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    iQuery( NULL ), iQueryStarted( EFalse )
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	{
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	// No implementation required
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	}
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CLocationRelationObserver::~CLocationRelationObserver()
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	{
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	iRelationIdArray.Close();
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	if( iSession )
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		{
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		TRAP_IGNORE( iSession->RemoveRelationObserverL( *this ) );
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		}
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	if( iQuery )
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	    {
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	    iQuery->Cancel();
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	    delete iQuery;
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	    iQuery = NULL;
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	    }
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	}
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CLocationRelationObserver* CLocationRelationObserver::NewL( CMdESession* aSession, CComposerImagePlugin* aComposer )
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	{
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	WRITELOG( "CLocationRelationObserver::NewL start" );
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	CLocationRelationObserver* self = new (ELeave)CLocationRelationObserver();
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	CleanupStack::PushL( self );
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	self->ConstructL( aSession, aComposer );
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	CleanupStack::Pop( self ); 
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	WRITELOG( "CLocationRelationObserver::NewL end" );
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	return self;
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	}
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void CLocationRelationObserver::ConstructL( CMdESession* aSession, CComposerImagePlugin* aComposer )
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	{
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    WRITELOG( "CLocationRelationObserver::ConstructL start" );
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    User::LeaveIfNull( iSession = aSession );
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    User::LeaveIfNull( iComposer = aComposer );
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    iDefaultNamespace = &iSession->GetDefaultNamespaceDefL();
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    // start listening to mde location object changes
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    CMdELogicCondition* condition = CMdELogicCondition::NewL( ELogicConditionOperatorAnd );
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    CleanupStack::PushL( condition );
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    CMdERelationDef& relationDef = iDefaultNamespace->GetRelationDefL( 
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    		MdeConstants::Relations::KContainsLocation );
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    // Create relation condition
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    CMdERelationCondition* relCond = &condition->AddRelationConditionL( relationDef );
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    // Remove relation condition from logic condition
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    condition->Remove( 0 );
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    // and delete logic condition
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    CleanupStack::PopAndDestroy( condition );
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    iSession->AddRelationObserverL( *this, relCond, ENotifyAdd | ENotifyModify | ENotifyRemove, iDefaultNamespace );
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    WRITELOG( "CLocationRelationObserver::ConstructL end" );
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	}
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void CLocationRelationObserver::HandleRelationNotification(
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		CMdESession& /*aSession*/, TObserverNotificationType aType,
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		const RArray<TItemId>& aRelationIdArray)
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	{
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#ifdef _DEBUG
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	WRITELOG2( "CLocationRelationObserver::HandleObjectModified() objects: %d, aType: %d", aRelationIdArray.Count(), aType );
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#endif
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	if ( aType == ENotifyAdd || aType == ENotifyModify )
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    	{
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#ifdef _DEBUG
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        WRITELOG1( "CLocationRelationObserver::HandleObjectModified() objects: %d", aRelationIdArray.Count() );
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#endif
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        // get images 
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        const TInt count = aRelationIdArray.Count();
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        for( TInt i = 0; i < count; i ++ )
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        	{
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        	iRelationIdArray.Append( aRelationIdArray[i] );
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        	}
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        if( !iQueryStarted )
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        	{
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        	TRAP_IGNORE( QueryRelationItemsL() );
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        	}
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    	}	
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	}
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// ---------------------------------------------------------------------------
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// QueryImageObjectIdsL
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// ---------------------------------------------------------------------------
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//
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void CLocationRelationObserver::QueryRelationItemsL()
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    {
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    if ( iRelationIdArray.Count() > 0 )
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    	{
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    	iQueryStarted = ETrue;
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    	}
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    else
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    	{ 
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    	iQueryStarted = EFalse;
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    	return;
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    	}
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    delete iQuery; iQuery = NULL;
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    RArray<TItemId> objectIds;
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    CleanupClosePushL( objectIds );
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    const TInt count = iRelationIdArray.Count();
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    for ( TInt i = 0; i < count; i++ )
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    	{
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    	objectIds.Append( iRelationIdArray[i] );
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    	}
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    iRelationIdArray.Reset();
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    iQuery = iSession->NewRelationQueryL( *iDefaultNamespace, this );
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    User::LeaveIfNull( iQuery );
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    iQuery->SetResultMode( EQueryResultModeId );
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    iQuery->Conditions().SetOperator( ELogicConditionOperatorAnd );
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    // Relation id must be in array
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    iQuery->Conditions().AddRelationConditionL( objectIds );
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    CMdERelationCondition& filterCondLeft = iQuery->Conditions().
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    		AddRelationConditionL( ERelationConditionSideLeft );
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   159
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    // Left object in relation must be an image object.
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    CMdEObjectDef& imageObjDef = iDefaultNamespace->GetObjectDefL(
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    		MdeConstants::Image::KImageObject );
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    filterCondLeft.LeftL().AddObjectConditionL( imageObjDef );
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   164
    
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    CMdERelationCondition& filterCondRight = iQuery->Conditions().
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	AddRelationConditionL( ERelationConditionSideRight );
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   167
    
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    // Right object in relation must be a location object.
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    CMdEObjectDef& locationObjDef = iDefaultNamespace->GetObjectDefL(
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    		Location::KLocationObject );
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    filterCondRight.RightL().AddObjectConditionL( locationObjDef );
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    iQuery->FindL(); // results to a call to HandleQueryCompleted()
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    CleanupStack::PopAndDestroy( &objectIds );
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    }
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// ---------------------------------------------------------------------------
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// HandleQueryCompleted
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// From MMdEQueryObserver.
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// ---------------------------------------------------------------------------
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//
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void CLocationRelationObserver::HandleQueryNewResults( CMdEQuery& /*aQuery*/,
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    TInt /*aFirstNewItemIndex*/, TInt /*aNewItemCount*/ )
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    {
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    }
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// ---------------------------------------------------------------------------
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// HandleQueryCompleted
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// From MMdEQueryObserver.
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// ---------------------------------------------------------------------------
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//
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void CLocationRelationObserver::HandleQueryCompleted( CMdEQuery& aQuery, TInt /*aError*/ )
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    {
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    if ( aQuery.Count() == 0 )
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        {
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        WRITELOG( "CLocationObjectObserver::HandleQueryCompleted() - no items found" );
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        }
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    else 
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    	{
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	    TRAP_IGNORE(
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	    const TInt count = aQuery.Count();
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	    for ( TInt i = 0; i < count; i++ )
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	    	{
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	    	CMdERelation* relation = iSession->GetRelationL( aQuery.ResultId(i) );
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	        if ( iComposer && relation )
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	            {
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	            iComposer->WriteGPSTagsL( relation->LeftObjectId(), relation->RightObjectId() );
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	            }
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   210
	    	
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	    	delete relation;
40
hgs
parents: 20
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   212
	    	relation = NULL;
0
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	    	}
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   214
	    	)
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    	}
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   216
    
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   	TRAP_IGNORE( QueryRelationItemsL() );
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    }