webengine/osswebengine/cache/inc/HttpCacheLookupTable.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 24 Sep 2009 12:53:48 +0300
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permissions -rw-r--r--
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/*
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* Copyright (c) 2006 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Definition of CHttpCacheLookupTable
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*
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*/
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#ifndef CHTTPCACHELOOKUPTABLE_H
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#define CHTTPCACHELOOKUPTABLE_H
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//  INCLUDES
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#include <e32base.h>
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#include <s32file.h>
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// CONSTANTS
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// MACROS
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// DATA TYPES
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// FUNCTION PROTOTYPES
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// FORWARD DECLARATIONS
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class CHttpCacheEntry;
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class RFileWriteStream;
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class RFileReadStream;
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class CHttpCacheEvictionHandler;
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class CHttpCacheStreamHandler;
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// CLASS DECLARATION
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struct THttpCacheLookupTableEntryIterator
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    {
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    TInt iPos;
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    TInt iCount;
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    };
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/**
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*
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*  @lib
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*  @since 3.1
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*/
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class CHttpCacheLookupTable : public CBase
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    {
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    public:  // Constructors and destructor
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        /**
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        * Two-phased constructor.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CHttpCacheLookupTable object.
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        */
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        static CHttpCacheLookupTable* NewL( CHttpCacheEvictionHandler& aEvictionHandler, CHttpCacheStreamHandler& aStreamHandler );
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        /**
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        * Destructor.
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        */
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        virtual ~CHttpCacheLookupTable();
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    public: // new functions
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        CHttpCacheEntry* InsertL( const TDesC8& aUrl );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        CHttpCacheEntry* Find( const TDesC8& aUrl );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt Remove( const TDesC8& aUrl );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt RemoveAll();
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        /**
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        *
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        * @since 7.1
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        * @param
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        * @return
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        */
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        TInt CHttpCacheLookupTable::ListFiles( RPointerArray<TDesC>& aFilenameList );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        const CArrayPtrFlat<CHttpCacheEntry>& Entries() const { return *iEntries; }
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void EraseCacheEntry( const TDesC8& aUrl );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void InternalizeL( RReadStream& aReadStream, const TDesC& aDirectory );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void ExternalizeL( RWriteStream& aWriteStream, const TDesC& aDirectory );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void MergeL( CHttpCacheLookupTable* aHttpCacheLookupTable, RFs aRfs, const TDesC& aDirectory );
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        /**
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         *
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         * @since 7.1
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         * @param
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         * @return
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         */
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        void BeginEntryIteration(THttpCacheLookupTableEntryIterator& aIter);
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        /**
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         *
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         * @since 7.1
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         * @param
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         * @return
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         */
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        const CHttpCacheEntry* NextEntry(THttpCacheLookupTableEntryIterator& aIter);
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0
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    private:
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0
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        /**
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        * Construct.
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        * @since 3.1
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        * @param
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        * @param
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        * @return CHttpCacheLookupTable object.
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        */
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        CHttpCacheLookupTable( CHttpCacheEvictionHandler& aEvictionHandler, CHttpCacheStreamHandler& aStreamHandler );
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0
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        /**
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        * By default Symbian 2nd phase constructor is private.
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        */
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        void ConstructL();
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0
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    private: //
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt InsertL( CHttpCacheEntry* aCacheEntry );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt Probe( const TDesC8& aKey, TBool aInsert );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TInt HashUrl( const TDesC8& aUrl );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void ReHashL();
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TUint NextPrime( TUint aNum );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void Erase( TInt aPos );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool Valid( TInt aPos );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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parents:
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        */
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        TBool Empty( TInt aPos );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool Deleted( TInt aPos );
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0
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        void SetDeleted( TInt aPos );
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        /**
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        *
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        * @since 3.1
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        * @param
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        * @return
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        */
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        TBool BoundaryCheck( TInt aPos );
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    private:    // Data
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        // hash table for cache entries
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        CArrayPtrFlat<CHttpCacheEntry>* iEntries;
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        // number of entries in the hashtable
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        TInt                            iCount;
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        //
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        CHttpCacheEvictionHandler*      iEvictionHandler;         // not owned
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        //
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        CHttpCacheStreamHandler*        iStreamHandler;           // not owned
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    };
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#endif      // CHTTPCACHELOOKUPTABLE_H
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    // End of File