author | hgs |
Wed, 06 Oct 2010 14:49:39 +0530 | |
changeset 71 | 27f2d7aec52a |
parent 43 | 72396548277c |
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/* |
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* Copyright (c) 2008-2009 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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*/ |
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#ifndef _C_GLXDATASOURCETASKMDS_H_ |
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#define _C_GLXDATASOURCETASKMDS_H_ |
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/** |
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* @author Simon Brooks, Alex Birkett |
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*/ |
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// INCLUDES |
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#include <e32cmn.h> |
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#include <glxdatasource.h> |
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#include <glxdatasourcetask.h> |
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#include <glxfilterproperties.h> |
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#include <mdccommon.h> |
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#include <mdequery.h> |
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#include <mpxfilter.h> |
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// FORWARD DECLARATIONS |
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class CGlxDataSourceMde; |
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class CGlxRequest; |
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class CMdEObjectDef; |
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class CMdEObjectQuery; |
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class CMdESession; |
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/** |
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* Query types supported by subclasses of CGlxDataSourceTaskMde |
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*/ |
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enum TGlxQueryType |
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{ |
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EContainerFirstItemQuery, // CGlxDataSourceTaskMdeThumbnail+ |
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EIdListQuery, // GlxDataSourceTaskMdeIdList |
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EAttributeQuery, // CGlxDataSourceTaskMdeAttribute |
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ELocationAttributeQuery, // CGlxDataSourceTaskMdeAttribute |
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EImageVideoQuery, // CGlxDataSourceTaskMdeAttribute (but should be general) |
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ECommandRemoveFromContainer, // CGlxDataSourceTaskMdeCommand |
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ECommandAddToContainer, // CGlxDataSourceTaskMdeCommand |
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ECommandRemoveLocation, // CGlxDataSourceTaskMdeCommand |
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ECommandAddContainer, // CGlxDataSourceTaskMdeCommand adds a container |
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ECommandDeleteContainers, // CGlxDataSourceTaskMdeCommand deletes containers objects |
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ECommandDeleteItems, // CGlxDataSourceTaskMdeCommand deletes containers objects |
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ECommandRenameContainer, |
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ECommandRename |
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}; |
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/** |
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* CGlxDataSourceTaskMde class |
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* Base class for mde tasks: provides task generic functionality. |
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*/ |
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NONSHARABLE_CLASS(CGlxDataSourceTaskMde) : public CGlxDataSourceTask, |
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public MMdEQueryObserver |
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{ |
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public: |
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/** |
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* Constructor. |
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* @param aRequest request to be executed. |
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* @param aObserver observer to be informed when task has completed. |
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* @param aDataSource data source to be used by this object. |
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*/ |
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CGlxDataSourceTaskMde(CGlxRequest* aRequest, MGlxDataSourceRequestObserver& |
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aObserver, CGlxDataSource* aDataSource); |
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/** |
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* Destructor. |
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*/ |
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~CGlxDataSourceTaskMde(); |
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/** |
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* Second stage constructor |
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*/ |
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virtual void ConstructL(); |
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protected: // to be implemented by deriving classes |
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/** |
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* See @ref CGlxDataSourceTask::ExecuteRequestL |
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*/ |
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virtual void ExecuteRequestL() = 0; |
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/** |
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* Must be implemented by deriving classes. To handle query completion |
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* @param aQuery Query that has been completed. |
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*/ |
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virtual void DoHandleQueryCompletedL(CMdEQuery& aQuery) = 0; |
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/** |
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* Optionally implemented by deriving classes. Used if the deriving class has |
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* to run more than one query. Should start the next query or call HandleRequestComplete() |
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* if no futher queries are required to be run. If the deriving class only has a single query, |
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* HandleRequestComplete() can be called from DoHandleQueryCompletedL() |
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*/ |
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virtual void DoNextQueryL() {} |
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public: // From CGlxDataSourceTask |
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/** |
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* See @ref CGlxDataSourceTask::CancelRequest |
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*/ |
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void CancelRequest(); |
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private: // from MMdEQueryObserver |
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/** |
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* See @ref MMdEQueryObserver::HandleQueryNewResults |
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*/ |
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void HandleQueryNewResults( CMdEQuery& aQuery, |
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TInt aFirstNewItemIndex, |
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TInt aNewItemCount ); |
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/** |
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* See @ref MMdEQueryObserver::HandleQueryNewResults |
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*/ |
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void HandleQueryNewResults( CMdEQuery& aQuery, |
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TInt aNewObjectItemCount, |
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TInt aNewRelationItemCount, |
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TInt aNewEventItemCount); |
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/** |
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* See @ref MMdEQueryObserver::HandleQueryCompleted |
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*/ |
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void HandleQueryCompleted( CMdEQuery& aQuery, TInt aError); |
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protected: |
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/** |
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* Returns a pointer to the CGlxDataSourceMde object passed in on instantiation. |
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* @return a pointer to the CGlxDataSourceMde object passed in on instantiation. |
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*/ |
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CGlxDataSourceMde* DataSource(); |
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void AddMonthFilterL(const TGlxMediaId& aContainerId, |
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TGlxFilterProperties& aFilterProperties); |
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void AddMonthFilterL(CMdEObject* aMonth, TGlxFilterProperties& aFilterProperties); |
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/** |
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* Set query contditions by container id and filter properties. |
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* @param aLogicCondition logic condition to add conditions to |
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* @param aContainerId Id of the container |
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* @param aContainerIsLeft. This should be set to to ETrue if the container is on the left side of the releation, or |
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* EFalse if the container is on the right side of the relation |
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* |
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*/ |
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void SetQueryConditionsL(CMdEQuery& aQuery, const TGlxFilterProperties& aFilterProperties, |
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const TGlxMediaId aContainerId, CMdEObjectDef& aObjectDef); |
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void SetQueryFilterConditionsL(CMdELogicCondition& aLogicCondition, CMdEObjectDef& aObjectDef, |
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const TGlxFilterProperties& aFilterProperties); |
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void SetSortOrderL(CMdEQuery& aQuery, CMdEObjectDef& aObjectDef, |
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const TGlxFilterProperties& aFilterProperties); |
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/** |
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* Returns the maximum number of items that a query should find. |
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* @return Maximum number of results |
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*/ |
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TInt MaxQueryResultsCount(const TGlxFilterProperties& aFilterProperties) const; |
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/** |
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* Removes and destroys the oldest query in iQueries. |
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*/ |
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void RemoveQuery(); |
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void DoQueryL(CMdEObjectDef& aObjectDef, TBool aIsContent, TGlxQueryType aQueryType, |
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TQueryResultMode aResultMode, const TGlxMediaId& aContainerId); |
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/** |
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* Adds queries for images and or videos to the query queue. The queries will return objects |
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* of type image or video that have ids specified by aObjectIds. |
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* @param aObjectIds A list of the ids of the required objects. |
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* @param aFilterProperties TGlxFilterProperties.iItemType is used to determine if only |
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* image or video queries are required if iItemType is not set to EGlxFilterImage or |
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* EGlxFitlerVideo a query for images will be queued first followed by a query for videos. |
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*/ |
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void QueueImageVideoObjectQueriesL(const RArray<TGlxMediaId>& aObjectIds, |
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const TGlxFilterProperties& aFilterProperties); |
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/** |
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* Adds a query for tag objects that have ids specified by aObjectIds |
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* to the query queue. |
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* @param aObjectIds A list of the ids of the required objects. |
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*/ |
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void QueueTagObjectQueryL(const RArray<TGlxMediaId>& aObjectIds); |
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/** |
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* Adds a query for album objects that have ids specified by aObjectIds |
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* to the query queue. |
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* @param aObjectIds A list of the ids of the required objects. |
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*/ |
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void QueueAlbumObjectQueryL(const RArray<TGlxMediaId>& aObjectIds); |
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/** |
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* Adds a query for "month" objects that have ids specified by aObjectIds |
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* to the query queue. |
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* @param aObjectIds A list of the ids of the required objects. |
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*/ |
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void QueueMonthObjectQueryL(const RArray<TGlxMediaId>& aObjectIds); |
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/** |
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* Adds a query for objects of type specified by aObjectDef |
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* that have ids specified by aObjectIds to the query queue. |
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* @param aObjectDef type of objects required. |
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* @param aObjectIds A list of the ids of the required objects. |
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* @param aQueryType The query type. |
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*/ |
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void QueueObjectQueryL(CMdEObjectDef& aObjectDef, |
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const RArray<TGlxMediaId>& aObjectIds, const TGlxQueryType& aQueryType); |
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/** |
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* Appends a query to the query queue. (the ownership of the query is transferred) |
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* @param aQuery query to append to the query queue ownership is transferred to |
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* the query queue. It is expected that aQuery is not on the cleanupstack before the |
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* call to AppendQueryL is made |
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* @param aQueryType the query type. |
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*/ |
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void AppendQueryL(CMdEQuery* aQuery, const TGlxQueryType& aQueryType); |
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/** |
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* Executes the query at ordinal 0 in the |
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* query list implementation can be overidden by |
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* deriving classes. |
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*/ |
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virtual void ExecuteQueryL(); |
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private: |
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/* |
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* Helper function TRAPed and called by HandleQueryCompleted() |
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* @param aQuery the query that has been completed |
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*/ |
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void HandleQueryCompletedL(CMdEQuery& aQuery); |
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/** |
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* Removes the observer from any existing queries, cancels and destroys them |
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*/ |
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void DestroyQueries(); |
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private: |
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/** |
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* Default namespace def (not owned) |
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*/ |
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CMdENamespaceDef* iDefaultNameSpaceDef; |
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protected: |
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/** |
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* Outstanding queries array (owned) |
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*/ |
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RPointerArray <CMdEQuery> iQueries; |
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/** |
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* Query types array (owned) |
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*/ |
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RArray <TGlxQueryType> iQueryTypes; |
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/** |
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* Filter properties |
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*/ |
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TGlxFilterProperties iFilterProperties; |
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}; |
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#endif //_C_GLXDATASOURCETASKMDS_H_ |