/*

* Copyright (c) 2006-2009 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:  Image Composer's listener for changes in db location relations

*

*/

#include <mdelogiccondition.h>

#include <mdequery.h>

#include "locationrelationobserver.h"

#include "harvesterlog.h"

#include "mdeconstants.h"

#include "composerimageplugin.h"

using namespace MdeConstants;

CLocationRelationObserver::CLocationRelationObserver() :

    iDefaultNamespace( NULL ), iSession( NULL ), iComposer( NULL ),

    iQuery( NULL ), iQueryStarted( EFalse )

	{

	// No implementation required

	}

CLocationRelationObserver::~CLocationRelationObserver()

	{

	iRelationIdArray.Close();

	if( iSession )

		{

		TRAP_IGNORE( iSession->RemoveRelationObserverL( *this ) );

		}

	}

CLocationRelationObserver* CLocationRelationObserver::NewL( CMdESession* aSession, CComposerImagePlugin* aComposer )

	{

	WRITELOG( "CLocationRelationObserver::NewL start" );

	CLocationRelationObserver* self = new (ELeave)CLocationRelationObserver();

	self->ConstructL( aSession, aComposer );

	WRITELOG( "CLocationRelationObserver::NewL end" );

	return self;

	}

void CLocationRelationObserver::ConstructL( CMdESession* aSession, CComposerImagePlugin* aComposer )

	{

    WRITELOG( "CLocationRelationObserver::ConstructL start" );

    User::LeaveIfNull( iSession = aSession );

    User::LeaveIfNull( iComposer = aComposer );

    iDefaultNamespace = &iSession->GetDefaultNamespaceDefL();

    // start listening to mde location object changes

    CMdELogicCondition* condition = CMdELogicCondition::NewL( ELogicConditionOperatorAnd );

    CleanupStack::PushL( condition );

    CMdERelationDef& relationDef = iDefaultNamespace->GetRelationDefL( 

    		MdeConstants::Relations::KContainsLocation );

    // Create relation condition

    CMdERelationCondition* relCond = &condition->AddRelationConditionL( relationDef );

    // Remove relation condition from logic condition

    condition->Remove( 0 );

    // and delete logic condition

    CleanupStack::PopAndDestroy( condition );

    iSession->AddRelationObserverL( *this, relCond, ENotifyAdd | ENotifyModify | ENotifyRemove, iDefaultNamespace );

    WRITELOG( "CLocationRelationObserver::ConstructL end" );

	}

void CLocationRelationObserver::HandleRelationNotification(

		CMdESession& /*aSession*/, TObserverNotificationType aType,

		const RArray<TItemId>& aRelationIdArray)

	{

#ifdef _DEBUG

	WRITELOG2( "CLocationRelationObserver::HandleObjectModified() objects: %d, aType: %d", aRelationIdArray.Count(), aType );

#endif

	if ( aType == ENotifyAdd || aType == ENotifyModify )

    	{

#ifdef _DEBUG

        WRITELOG1( "CLocationRelationObserver::HandleObjectModified() objects: %d", aRelationIdArray.Count() );

#endif

        // get images 

        const TInt count = aRelationIdArray.Count();

        for( TInt i = 0; i < count; i ++ )

        	{

        	iRelationIdArray.Append( aRelationIdArray[i] );

        	}

        if( !iQueryStarted )

        	{

        	TRAP_IGNORE( QueryRelationItemsL() );

        	}

    	}	

	}

// ---------------------------------------------------------------------------

// QueryImageObjectIdsL

// ---------------------------------------------------------------------------

//

void CLocationRelationObserver::QueryRelationItemsL()

    {

    if ( iRelationIdArray.Count() > 0 )

    	{

    	iQueryStarted = ETrue;

    	}

    else

    	{ 

    	iQueryStarted = EFalse;

    	return;

    	}

    delete iQuery; iQuery = NULL;

    RArray<TItemId> objectIds;

    CleanupClosePushL( objectIds );

    const TInt count = iRelationIdArray.Count();

    for ( TInt i = 0; i < count; i++ )

    	{

    	objectIds.Append( iRelationIdArray[i] );

    	}

    iRelationIdArray.Reset();

    iQuery = iSession->NewRelationQueryL( *iDefaultNamespace, this );

    User::LeaveIfNull( iQuery );

    iQuery->SetResultMode( EQueryResultModeId );

    iQuery->Conditions().SetOperator( ELogicConditionOperatorAnd );

    // Relation id must be in array

    iQuery->Conditions().AddRelationConditionL( objectIds );

    CMdERelationCondition& filterCondLeft = iQuery->Conditions().

    		AddRelationConditionL( ERelationConditionSideLeft );

    // Left object in relation must be an image object.

    CMdEObjectDef& imageObjDef = iDefaultNamespace->GetObjectDefL(

    		MdeConstants::Image::KImageObject );

    filterCondLeft.LeftL().AddObjectConditionL( imageObjDef );

    CMdERelationCondition& filterCondRight = iQuery->Conditions().

	AddRelationConditionL( ERelationConditionSideRight );

    // Right object in relation must be a location object.

    CMdEObjectDef& locationObjDef = iDefaultNamespace->GetObjectDefL(

    		Location::KLocationObject );

    filterCondRight.RightL().AddObjectConditionL( locationObjDef );

    iQuery->FindL(); // results to a call to HandleQueryCompleted()

    CleanupStack::PopAndDestroy( &objectIds );

    }

// ---------------------------------------------------------------------------

// HandleQueryCompleted

// From MMdEQueryObserver.

// ---------------------------------------------------------------------------

//

void CLocationRelationObserver::HandleQueryNewResults( CMdEQuery& /*aQuery*/,

    TInt /*aFirstNewItemIndex*/, TInt /*aNewItemCount*/ )

    {

    }

// ---------------------------------------------------------------------------

// HandleQueryCompleted

// From MMdEQueryObserver.

// ---------------------------------------------------------------------------

//

void CLocationRelationObserver::HandleQueryCompleted( CMdEQuery& aQuery, TInt /*aError*/ )

    {

    if ( aQuery.Count() == 0 )

        {

        WRITELOG( "CLocationObjectObserver::HandleQueryCompleted() - no items found" );

        }

    else 

    	{

	    TRAP_IGNORE(

	    const TInt count = aQuery.Count();

	    for ( TInt i = 0; i < count; i++ )

	    	{

	    	CMdERelation* relation = iSession->GetRelationL( aQuery.ResultId(i) );

	        if ( iComposer && relation )

	            {

	            iComposer->WriteGPSTagsL( relation->LeftObjectId(), relation->RightObjectId() );

	            }

	    	delete relation;

	    	}

	    	)

    	}

   	TRAP_IGNORE( QueryRelationItemsL() );

    }