/*

* Copyright (c) 2005 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:  CNssVasDbBuilder is owned by CNssVASDBMgr. It is responsible for creating

*               the context manaher, tag manager, vas db event notifier, and tag select 

*               notifier. This class is a singleton, and is created using the InstanceL(),

*               and deleted using the RemoveInstance() methods. 

*

*/

#ifndef CNSSVASDBBUILDER_H

#define CNSSVASDBBUILDER_H

#include "nssvascvasdatabase.h"

#include "nssvasccontextmgr.h"

#include "nssvasctagmgr.h"

#include "nssvascvasdbeventnotifier.h"

#include "nssvascdbtagselectnotifier.h"

#include "nssvascvasdbsrvdef.h" 

//FORWARD DECLARATIONS

// CLASS DECLARATIONS

/**

*  Singleton builder class for creating the VAS DB objects.

*  @lib NssVASApi.lib

*  @since 2.8

*/

class CNssVASDBBuilder : public CBase

{

public:

   /**

   * This function returns an instance of CNssVASDBBuilder.

   * Must be called one to one with RemoveInstance(). 

   * @since 2.0

   * @param

   * @return pointer to CNssVASDBBuilder

   */

	static CNssVASDBBuilder* InstanceL();

	/**

   * This method removes one instance of this class by decrementing

   * the number of instances. When the number of instances hit 0,

   * the object is deleted. Must be called one to one with InstanceL().

   * @since 2.0

   * @param

   * @return

   */

	static void RemoveInstance();

	/**

   * Destructor.

   * @param

   * @return

   */	

	~CNssVASDBBuilder();

   /**

   * Initializes VAS DB 

   * Only one initialization per object lifetime is doing a real job

   * All the subsequent calls to InitializeL are ignored

   * @since 2.0

   * @param 

   * @return none 

   */

   void InitializeL();

   /**

   * Gets the ContextMgr.

   * @since 2.0

   * @param 

   * @return pointer to CNssContextMgr

   */	

   CNssContextMgr* GetContextMgr();

   /**

   * Gets the TagMgr.

   * @since 2.0

   * @param 

   * @return pointer to CNssTagMgr

   */	

   CNssTagMgr* GetTagMgr();

   /**

   * Gets the Vas Db event notifier.

   * @since 2.0

   * @param 

   * @return pointer to CNssVASDBEventNotifier

   */    

   CNssVASDBEventNotifier* GetVASDBEventNotifier();

   /**

   * Gets the Vas Db event notifier.

   * @since 2.0

   * @param 

   * @return pointer to CNssVASDBEventNotifier

   */    

   CNssDBTagSelectNotifier* GetTagSelectNotifier();

private:

	/**

   * C++ constructor

   * @param 

   * @return 

   */    

   CNssVASDBBuilder();

	/**

   * 2 phase construction

   * @param

   * @return

   */

	static CNssVASDBBuilder* NewL ();

	/**

   * 2 phase construction

   * @param

   * @return

   */

	static CNssVASDBBuilder* NewLC ();

   /**

   * EPOC constructor

   * @param 

   * @return 

   */    

   void ConstructL ();

	/**

   * closes the VAS database

   * @since 2.0

   * @param -

   * @return 

   */    

   void Close();

   // owns the VAS Database

   CNssVASDatabase*			iVasDatabase;

   // owns the context manager

   CNssContextMgr*				iContextMgr;

   // owns the tag manager

   CNssTagMgr*					iTagMgr;

   // owns the tag select notifier

   CNssDBTagSelectNotifier*	iDBTagSelectNotifier;

   // owns the event notifier

   CNssVASDBEventNotifier*		iVASDBEventNotifier;

   // Only one initialization per lifetime is permitted

   // All the subsequent calls to InitializeL are ignored

   TBool					iInitialized;

};

// structure for singleton implementation

// 

struct TThreadLocalStorage 

{

	CNssVASDBBuilder* iInstance;

    TInt16 iInstanceCount;

};

#endif // __CVASDBBUILDER_H