/*

* Copyright (c) 2006 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:  This header file describes the class that handles the 

*                asynchronous operations on the triggers in database.

*

*/

#ifndef C_LBTDB_OPERATION_AO_H

#define C_LBTDB_OPERATION_AO_H

#include <e32base.h>

#include <d32dbms.h>

// forward declaration

class CLbtDbTriggersManager;

/**

 *  Execute the Database operations asynchronously

 */

NONSHARABLE_CLASS( CLbtDbOperationAO ) : public CActive

    {

public:

    static CLbtDbOperationAO* NewL(

        RDbDatabase& aDb,

        CLbtDbTriggersManager* aObserver);

    virtual ~CLbtDbOperationAO();

    void ExecuteQuery(

        RDbView& aView,

        TDesC& aQuery);

    TInt ExecuteSyncQuery(

        RDbView& aView,

        TDesC& aQuery);

    void CompactDb();

    TBool IsCompactionOngoing();

protected:

    /**

     * Implements cancellation of an outstanding request.

     */

	virtual void DoCancel();

    /**

     * Handles completion of the Db operation request.

     */

	virtual void RunL();

	/**

	 * Handles error in the execution of the Db operation

	 */

	virtual TInt RunError(TInt aError);

private:

    CLbtDbOperationAO(

        RDbDatabase& aDb,

        CLbtDbTriggersManager* aObserver);

    void ConstructL();

private:

    enum TDbOperationType

        {

            EDbOperationNone = 0, // Currently ready to execute a Db operation

            EDbSqlQuery = 1, // Executing a Sql Query on the Database

            EDbCompaction = 2 // Executing a compaction operation on the database

        };

private: // data

    /** Handle to the Database */

    RDbDatabase& iDb;

    /** 

     * The Database view which provides the interface to execute 

     * the db operations.

     * Does not own the Handle. This is just a reference.

     */

    RDbView* iView;

    /**

     * The observer for the asynchronous operation.

     * Does not own the observer object.

     */

    CLbtDbTriggersManager* iObserver; 

    /**

     * The Db handle to execute incremental operations on the database.

     * Typical operations are on the database itself like compaction and

     * recovery..

     */

    RDbIncremental iDbIncrOp;

    /**

     * Counts the remaining steps in the Incremental operation

     */

    TInt iSteps;

    /**

     * Indicates the type of async Db operation being performed by this object

     */

    TDbOperationType iOperation;

    };

#endif // C_LBTDB_OPERATION_AO_H