idlehomescreen/inc/xndomstringpool.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 21 Jun 2010 15:27:11 +0300
branchRCL_3
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Revision: 201023 Kit: 2010125
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/*
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* Copyright (c) 2005,2006 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 "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:  Flyweigth pattern implementation for dom strings.
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*
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*/
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#ifndef XN_DOM_STRING_POOL_H
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#define XN_DOM_STRING_POOL_H
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//  INCLUDES
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#include <e32base.h>
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#include <s32strm.h>
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#include "xndomstringpooloptimizer.h"
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// CLASS DECLARATION
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/**
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*  @ingroup group_domdocument
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*  Class utilize flyweight pattern. Dom strings are stored once 
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*  and referred with index. Class can be serialized.
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*
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*  @lib xndomdocument.lib
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*  @since Series 60 3.1
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*/
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class CXnDomStringPool : 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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        * 
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        * @param    aAllowDuplicates        ETrue if duplicates are to be allowed.
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        *                                   Supported for legacy reasons. 
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        */
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        static CXnDomStringPool* NewL( const TBool aAllowDuplicates = EFalse );
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        /**
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        * Two-phased stream constructor.
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        * 
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        * @param    aStream                 Stream where string pool is internalized.
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        * @param    aAllowDuplicates        ETrue if duplicates are to be allowed.
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        *                                   Supported for legacy reasons. 
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        */
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        static CXnDomStringPool* NewL( RReadStream& aStream,
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                const TBool aAllowDuplicates = EFalse );
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        /**
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        * Destructor.
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        */
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        virtual ~CXnDomStringPool();
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   public: 
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        /**
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        * Make a copy from original StringPool.
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        * @since Series 60 3.1
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        * @return Pointer to a string pool. Ownership is transferred to a caller.
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        */
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        CXnDomStringPool* CloneL(); 
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   public: //Adding
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        /**
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        * Set dom string into string pool.
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        * 
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        * @param aString String to add to string pool
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        * @return Index (reference) to string pool
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        */
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        TInt AddStringL( const TDesC8& aString ); 
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        /**
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        * Set dom string into string pool.
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        * 
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        * @param aString String to add to string pool. OWNERSHIP TRANSFERRED!
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        * @return Index (reference) to string pool
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        */
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        TInt AddStringL( HBufC8* aString );         
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        /**
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        * Add all string from another string pool.
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        * 
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        * @param aStringPool    Source string pool.
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        */
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        void AddAllL( CXnDomStringPool& aStringPool );        
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   public: //Accessing     
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        /**
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        * Get reference to string.
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        * 
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        * @param aMap Map object which has index to name string
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        * @return Pointer to the name
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        */
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        const TDesC8& String( const TInt aStringRef ); 
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        /**
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        * Get object's data size in bytes.
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        * 
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        * @return Data size in bytes
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        */
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        TInt Size() const;
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        /**
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        * Get amount of strings.
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        */
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        TInt Count() const;        
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        /**
2
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        * Externalize object.
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        * 
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        * @param aStream Output stream
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        */
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        void ExternalizeL( RWriteStream& aStream ) const;
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        /**
2
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        * Internalize object.
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        * 
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        * @param aStream Input stream
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        */
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        void InternalizeL( RReadStream& aStream );          
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   private:
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        /**
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        * C++ default constructor.
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        * 
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        * @param    aAllowDuplicates        ETrue if duplicates are to be allowed.
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        *                                   Supported for legacy reasons.
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        */
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        CXnDomStringPool( const TBool aAllowDuplicates );
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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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        /**
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        * Add string to string pool and to optimizer also.
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        * 
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        * @param aNewString     String to be added. OWNERSHIP TRANSFERRED.
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        * @param TInt           Index to added string.
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        */
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        TInt DoAddStringL( HBufC8* aNewString ) ;
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    private:            
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        //String pool
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        RPointerArray<HBufC8>       iStringPool;
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        /**
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         * String pool optimizer.
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         */
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        TXnDomStringPoolOptimizer iStringPoolOptimizer;
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        /**
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         * ETrue if string pool can contain duplicate entries. Must
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         * be supported for legacy reasons while loading xuikon odts.
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         */
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        TBool iAllowDuplicates;
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    };
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#endif      // XN_DOM_STRING_POOL_H  
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// End of File