satengine/SatServer/inc/MSatSystemStateChangeNotifier.h
changeset 46 2fa1fa551b0b
parent 42 35488577e233
child 48 78df25012fda
equal deleted inserted replaced
42:35488577e233 46:2fa1fa551b0b
     1 /*
       
     2 * Copyright (c) 2002-2006 Nokia Corporation and/or its subsidiary(-ies). 
       
     3 * All rights reserved.
       
     4 * This component and the accompanying materials are made available
       
     5 * under the terms of "Eclipse Public License v1.0"
       
     6 * which accompanies this distribution, and is available
       
     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
       
     8 *
       
     9 * Initial Contributors:
       
    10 * Nokia Corporation - initial contribution.
       
    11 *
       
    12 * Contributors:
       
    13 *
       
    14 * Description:  Interface for Publish and suscripe change notifier.
       
    15 *
       
    16 */
       
    17 
       
    18 
       
    19 
       
    20 #ifndef MSATSYSTEMSTATECHANGENOTIFIER_H
       
    21 #define MSATSYSTEMSTATECHANGENOTIFIER_H
       
    22 
       
    23 //  INCLUDES
       
    24 #include <e32std.h>
       
    25 
       
    26 // CONSTANTS
       
    27 // Indicates that the observer doesn't want to specify any value, when it should
       
    28 // be notified. In this case, the changed value is sent to observer
       
    29 const TInt KNotifyValueNotSet = -1;
       
    30 
       
    31 // CLASS DECLARATION
       
    32 
       
    33 /**
       
    34 *  Change notifier for Publish & Subscribe.
       
    35 *
       
    36 *  @lib SatSystemState
       
    37 *  @since Series 60 3.0
       
    38 */
       
    39 class MSatSystemStateChangeNotifier
       
    40     {
       
    41     public:  // Constructors and destructor
       
    42 
       
    43         /**
       
    44         * Destructor.
       
    45         */
       
    46         virtual ~MSatSystemStateChangeNotifier() {};
       
    47 
       
    48     public: // New functions
       
    49 
       
    50         /**
       
    51         * Request a notification of a change in system state.
       
    52         * The request is standing as long as it is canceled.
       
    53         */
       
    54         virtual void NotifyChangeL() = 0;
       
    55 
       
    56         /**
       
    57         * Cancels the notification request.
       
    58         */
       
    59         virtual void CancelNotify() = 0;
       
    60         
       
    61         /**
       
    62         * Gets the current value.
       
    63         * @return Current value for earlier request.
       
    64         */
       
    65         virtual TInt GetValueInt() { return KNotifyValueNotSet; };
       
    66 
       
    67     protected:  // New functions
       
    68 
       
    69         /**
       
    70         * C++ default constructor.
       
    71         */
       
    72         MSatSystemStateChangeNotifier() {};
       
    73 
       
    74     private:
       
    75 
       
    76         // Prohibit copy constructor if not deriving from CBase.
       
    77         MSatSystemStateChangeNotifier( const MSatSystemStateChangeNotifier& );
       
    78 
       
    79         // Prohibit assigment operator if not deriving from CBase.
       
    80         MSatSystemStateChangeNotifier& operator=( const MSatSystemStateChangeNotifier& );
       
    81 
       
    82     };
       
    83 
       
    84 #endif      // MSATSYSTEMSTATECHANGENOTIFIER_H
       
    85 
       
    86 // End of File