/*

* 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:  active object, that monitors the completion of FQDN resolve.

*

*/

#ifndef C_FQDNRESOLVER_H

#define C_FQDNRESOLVER_H

#include <e32base.h>

#include <es_sock.h>

// FORWARD DECLARATIONS

class CVpnConnection;

/**

 *  FQDN resolver callback interface.

 *  Callback interface which is used by CFqdnResolver object to notify

 *  about completion of FQDN address resolving.

 * 

 *  @lib internal (kmdserver.exe)

 */

class MFqdnResolverCallback

    {

public:

    /**

     * Notifies about completion of FQDN address resolving.

     * @param aStatus Completion status

     * @param aNameEntry Result of name resolution

     */

    virtual void AddressResolveCompleted( const TInt aStatus,

                                          const TNameEntry aNameEntry ) = 0;    

    };

/**

 *  FQDN address resolver.

 *  Active object provides functionality for resolving an IP address from FQDN

 *  address.

 *

 *  @lib internal (kmdserver.exe)

 */

class CFqdnResolver : public CActive

    {

public:

    /**

     * Two-phased constructor.

     * @param aConnection VPN connection object

     * @param aCallback Callback interface

     */

    static CFqdnResolver* NewL( CVpnConnection& aConnection,

                                MFqdnResolverCallback& aCallback );

    /**

     * Destructor.

     */

    ~CFqdnResolver();

    /**

     * Resolves IP address from FQDN address. Completion is notified via

     * MFqdnResolverCallback interface.

     * @param aFqdn FQDN address. Ownership transferred.

     */

    void ResolveAddress( HBufC* aFqdn );

private:

    CFqdnResolver( CVpnConnection& aConnection,

                   MFqdnResolverCallback& aCallback );

// from base class CActive

    /**

     * From CActive

     * Handles completion of asynchronous resolving request.

     */    

    void RunL();

    /**

     * From CActive

     * Handles cancellation of asynchronous resolving request.

     */    

    void DoCancel();

private: // data

    /**

     * VPN connection object.

     * Not own.

     */

    CVpnConnection&         iConnection;    

    /**

     * FQDN address

     * Own.

     */

    HBufC*                  iFqdn;

    /**

     * Name entry.

     * Own.

     */

    TNameEntry              iNameEntry;

    /**

     * Callback interface.

     * Not own.

     */

    MFqdnResolverCallback&  iCallback;    

    };

#endif // C_FQDNRESOLVER_H