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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** All rights reserved.
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QLANDMARK_DB_EVENT_HANDLER_H
#define QLANDMARK_DB_EVENT_HANDLER_H
// System Includes
#include <EPos_CPosLandmarkDatabase.h>
#include <e32base.h>
/*
* Observers that require notification of database events should derive from MLandmarkDbEventObserver
* and register with the Event Handler using CLandmarkDbEventHandler::AddObserver
*/
class MLandmarkDbEventObserver
{
public:
virtual void handleDatabaseEvent(const TPosLmEvent& aEvent) = 0;
};
/**
* CLandmarkDbEventHandler class is used to observer the landmark database
* events. It is a self running active object
* The initialization happens only once ensuring there is only one object of CLandmarkDbEventHandler
* There
*/
NONSHARABLE_CLASS( CLandmarkDbEventHandler ): public CActive
{
public:
/*
* Default Ctor
*/
CLandmarkDbEventHandler();
/*
* Default dtor
*/
~CLandmarkDbEventHandler();
/*
* AddObserver is used to add an observer, the observer will be notified upon
* database event completion
* The observer derives from MLandmarkDbEventObserver class
* The observer object destruction is to be done by the caller of AddObserver
*/
TInt AddObsever(MLandmarkDbEventObserver* aObserverHandle);
/*
* RemoveObsever is used to remove an observer, the observer will be notified upon
* database event completion
* The observer derives from MLandmarkDbEventObserver class
* The observer object destruction is to be done by the caller of AddObserver
*/
TInt RemoveObsever(MLandmarkDbEventObserver* aObserverHandle);
private:
/*
* Called by ActiveScheduler when an event occurs on this active object,
* i.e., when a landmark database event occurs
*/
void RunL();
/*
* Used to cancel the notification request
*/
void DoCancel();
/*
* This should be called before any use, it initializes all the required objects
*/
void InitializeL();
/*
* StartListening() is called to start listening to the database event
* It has to be protected by the iObserverLock. It is not taken inside this function
* for performance reasons.
*/
void StartListening();
private:
/*
* This is a handle to the database, it is used for Notification request
*/
CPosLandmarkDatabase* iDatabase;
/*
* Holds the event that occurred in the landmark database
*/
TPosLmEvent iEvent;
/*
* Holds the observers, the destruction of the observer is not done by this array
* It is the responsibility of the caller of AddObserver
*/
RPointerArray<MLandmarkDbEventObserver> iObserverList;
/*
* To synchronize the access to the observer list
*/
RFastLock iObserverLock;
/*
* ETrue if Initialize is done
*/
TBool iIsInitialized;
};
#endif // QLANDMARK_DB_EVENT_HANDLER_H
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