1 /*

     2 * Copyright (c) 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:  Class definition of Trigger Key

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef T_LBTTRIGGERKEY_H

    21 #define T_LBTTRIGGERKEY_H

    22 

    23 

    24 #include <s32btree.h>

    25 

    26 

    27 /**

    28  * TTriggerKey is a class to used to create and order keys to be used for 

    29  * entries in the Btree

    30  */

    31 class TLbtTriggerKey : public MBtreeKey

    32 

    33     {

    34     

    35 public:     // From Base Class MBtreeKey

    36 

    37     /**

    38      * Retrieves the key value for a particular entry

    39      */

    40     virtual const TAny* Key( const TAny* anEntry ) const;

    41     

    42     /**

    43      * Orders two keys 

    44      */

    45     virtual TInt Compare( const TAny *aLeft, const TAny *aRight ) const;

    46     

    47     /**

    48      * Determines the midpoint between two keys

    49      */

    50     virtual void Between( const TAny *aLeft, const TAny *aRight, 

    51                                             TBtreePivot &aPivot ) const;

    52     

    53     };

    54 

    55 #endif  // T_LBTTRIGGERKEY_H