author | Simon Howkins <simonh@symbian.org> |
Mon, 29 Nov 2010 11:47:03 +0000 | |
branch | RCL_3 |
changeset 78 | dbcb928abe9c |
parent 0 | 4e91876724a2 |
permissions | -rw-r--r-- |
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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: Definition of the Data Source Mixin Class. |
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* |
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*/ |
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#ifndef _MGLXDATASOURCE_H_ |
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#define _MGLXDATASOURCE_H_ |
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// INCLUDES |
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#include <e32cmn.h> |
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#include "mglxdatasourceupdateobserver.h" |
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#include "mglxdatasourcerequestobserver.h" |
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// FORWARD DECLARATIONS |
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class CGlxRequest; |
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// CONSTANTS |
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// CLASS DECLARATION |
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/** |
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* MGlxDataSource class |
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* |
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* Data Source collates Data Source information. |
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* @lib GlxDataSource.lib |
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* @ingroup collection_component_design |
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* @internal reviewed 11/07/2007 by Dave Schofield |
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*/ |
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class MGlxDataSource |
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{ |
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public: |
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/** |
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* Asynchronous call to retrieve |
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* |
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* @param aListId list for this query relates to |
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* @return error code |
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*/ |
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virtual void DataSourceRequestL(CGlxRequest* aRequest, MGlxDataSourceRequestObserver& aObserver) = 0; |
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/** |
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* Cancel asynchronous request call |
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* as each requestor can only have one active request the observer is sufficient to cancel the request. |
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* |
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*/ |
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virtual void CancelRequest(MGlxDataSourceRequestObserver& aObserver) = 0; |
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public: |
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/** |
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* Since there should be only one data source manager for a server, |
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* clients can use this function to either create the instance or |
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* return the pointer if the instance already exists. |
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* |
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* The pointers are reference counter, and the instance is deleted after |
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* there are no more clients. It is, therefore, necessary |
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* to release the instance by calling Close() when no longer needed. |
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* |
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* @returns a pointer to a new or existing list manager instance |
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*/ |
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IMPORT_C static MGlxDataSource* OpenDataSourceL(const TUid& aDataSource, MGlxDataSourceUpdateObserver& aObserver); |
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/** |
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* Decrements the reference count of the data source manager. Deletes the |
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* data source manager if there are no more references. |
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*/ |
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virtual void Close(MGlxDataSourceUpdateObserver& aObserver)=0; |
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}; |
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#endif //_MGLXDATASOURCE_H_ |