/*

* Copyright (c) 2002 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 class handls key operation

*

*/

#ifndef __TPENGSTORAGESERVERBTREEKEYS_H__

#define __TPENGSTORAGESERVERBTREEKEYS_H__

// INCLUDES

#include	<s32btree.h>

#include	"CPEngDataEntry.h"

#include	"PEngStorageServerCommon.h"

// CLASS DECLARATION

class TPEngBaseKey : public MBtreeKey

    {

    public:

        /*

         *	Return key which is between aLeft and aRight. Can be also equal to left.

         */

        void Between( const TAny* aLeft, const TAny* aRight, TBtreePivot& aPivot ) const

            {

            __ASSERT_ALWAYS( aLeft && aRight, User::Panic( KStorageServerName, EErrorInBTree ) );

            //Return key equal to left.

            aPivot.Copy( reinterpret_cast<const TUint8*>( aLeft ), 4 );

            }

        //Compare two keys.

        TInt Compare( const TAny* aLeft, const TAny* aRight ) const

            {

            __ASSERT_ALWAYS( aLeft && aRight, User::Panic( KStorageServerName, EErrorInBTree ) );

            HBufC* left = *reinterpret_cast<HBufC**>( const_cast<TAny*>( aLeft ) );

            HBufC* right = *reinterpret_cast<HBufC**>( const_cast<TAny*>( aRight ) );

            TInt ret = left->CompareF( *right );

            return ret;

            }

    };

class TPEngDataEntryKey : public TPEngBaseKey

    {

    public:

        //Get pointer to entry key.(HBufC**)

        const TAny* Key( const TAny* anEntry ) const

            {

            __ASSERT_ALWAYS( anEntry, User::Panic( KStorageServerName, EErrorInBTree ) );

            CPEngDataEntry* entry = *reinterpret_cast<CPEngDataEntry**>( const_cast<TAny*>( anEntry ) );

            return entry->KeyBuffer();

            }

    };

#endif      //  __TPENGSTORAGESERVERBTREEKEYS_H__

//  End of File