// Copyright (c) 2008-2009 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:

//

#ifndef __TZUSERDATA_H__

#define __TZUSERDATA_H__

#include <sqldb.h>

#include <vtzrules.h>

class CTzUserNames;

class RProperty;

enum TTzUserDataChangeOp

    {

    ETzUserDataCreated,  // User defined TZ data has been created.

    ETzUserDataUpdated,  // User defined TZ data has been updated.

    ETzUserDataDeleted,  // User defined TZ data has been deleted.

    ETzUserDataRestored, // User defined TZ data has been restored.

    };

struct TTzUserDataChange

    {

    // Operation that has changed user defined TZ data.

    TTzUserDataChangeOp iOperation;

    // Numeric TZID of the changed user defined TZ data.

    TInt iTzId;

    };

class MTzUserDataChangeObserver

    {

public:

    virtual void NotifyUserTzRulesChange(TTzUserDataChange aChange) = 0;

    virtual void NotifyUserTzNamesChange(TTzUserDataChange aChange) = 0;

    };

class CTzUserDataDb : public CBase

    {

public:

    static CTzUserDataDb* NewL();

 	~CTzUserDataDb();

 	void AddObserverL(MTzUserDataChangeObserver* aChangeObs);

 	void RemoveObserver(MTzUserDataChangeObserver* aChangeObs);

// CRUD operations.

    TInt CreateTzL(const CTzRules& aTzRules, const CTzUserNames& aTzNames);

    void ReadTzRulesL(CTzRules& aRules, TUint aTzId);

    CTzUserNames* ReadTzNamesL(TUint aTzId);

 	void ReadTzIdsL(RArray<TUint32>& aTzIds);

	void UpdateTzL(TUint aTzId, const CTzRules& aTzRules, const CTzUserNames& aTzNames);

    void DeleteTzL(TUint aTzId);

// Check if a given user ID exists in the database    

	TBool IsIdInDbL(TUint aTzId);

// Backup and restore operations.

    void BackupBeginningL();

    void BackupCompletedL();

    void RestoreBeginningL();

    void RestoreCompletedL();

 private:

    CTzUserDataDb();

    void ConstructL();

// Database operations.

    void OpenL();	

    void CreateL();

    void CreateSchemaL();

    void Close();

// Transaction operations.

    void BeginTransactionL();

    void CommitTransactionL();

    void RollbackTransaction();

    static void CleanupDatabaseRollback(TAny* aDatabase);

// Notification operations.

    void NotifyTzRulesChange(TUint aTzId, TTzUserDataChangeOp aChangeOp);

    void NotifyTzNamesChange(TUint aTzId, TTzUserDataChangeOp aChangeOp);

// Reuse TZ IDs

    TUint32 FindUnusedTzIdL();

 private:

 	RSqlDatabase iDatabase;

    TBool iBackupInProgress;

    TBool iRestoreInProgress;

    TUint32 iNextCandidateTzId;  

    RPointerArray<MTzUserDataChangeObserver> iChangeObservers;

    };

#endif // __TZUSERDATA_H__