uiservicetabsettings/inc/cvimpstsettingskeyvaluepair.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 10:12:18 +0200
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/*
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* Copyright (c) 2004 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:  Key - value container.
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*
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*/
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#ifndef __CVIMPSTSETTINGSKEYVALUEPAIR_H
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#define __CVIMPSTSETTINGSKEYVALUEPAIR_H
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//  INCLUDES
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#include <e32base.h>
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#include <s32strm.h>
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// CLASS DECLARATION
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/**
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 * Key - value container.
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 * Can be derived to expand services.
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 *
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 * @since 3.0
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 **/
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NONSHARABLE_CLASS( CVIMPSTSettingsKeyValuePair ): public CBase
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    {
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    public:  // Enumerations
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        /**
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         * Data type enumeration.
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         * List supported value data types.
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         * @since 3.0
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         **/
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        enum TValueType
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            {
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            EValueTypeNone = 0,            
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            EValueTypeDesC16
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            };
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    public:  // Constructors and destructor
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        /**
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         * Non leaving two phased constructor.
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         *
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         * If object allocation fails, returns NULL.
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         *
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         * @since 3.0
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         * @param aKey The key.
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         */
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        static CVIMPSTSettingsKeyValuePair* New( const TDesC& aKey );
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        /**
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         * Two phased constructor initializing object state
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         * from given flat descriptor.
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         *
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         * @since 3.0
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         * @param aKeyValuePairFlat The flat representation of key-value pair
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         */
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		static CVIMPSTSettingsKeyValuePair* NewLC( const TDesC& aKeyValuePairFlat );
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        /**
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         * Destructor.
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         */
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        virtual ~CVIMPSTSettingsKeyValuePair();
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    protected:  // Constructor
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        /**
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         * C++ default constructor.
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         */
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        CVIMPSTSettingsKeyValuePair();
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        /**
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         * Symbian OS constructor.
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         * Initializes object state from given stream.
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         *
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         * @since 3.0
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         * @param aStream The stream to read object state.
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         */
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        void ConstructL( RReadStream& aStream );
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    public:  //Data access
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        /**
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         * Key accessor.
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         *
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         * Gets the key associated with key-value object.
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         * Virtual to allow derived classes to expand behaviour.
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         *
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         * @since 3.0
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         * @return The key.
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         */
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        virtual const TDesC& Key() const;
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        /**
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         * Data setters.
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         *
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         *
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         * @since 3.0
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         * @param aValue The value to assign for key-value object.
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         * @return Error code. One of following:
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         * KErrNone: Value assigned/updated succesfully.
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         * KErrGeneral: Different data type already assigned.
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         * KErrNoMemory: No memory to allocate the new value.
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         * Original value remains if assigning new value fails.
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         */
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        TInt SetValue( const TDesC16& aValue );
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        /**
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         * Data getters.
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         *
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         *
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         * @since 3.0
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         * @param aValue The value to get.
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         * @return Error code. One of following:
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         * KErrNone: Value read succesfully.
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         * KErrNotFound: No value yet assigned.
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         * KErrGeneral: Different data type assigned.
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         * Given aValue isn't changed if reading fails.
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         */    
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        TInt GetValue( TPtrC16& aValue ) const;
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		/**
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         * Key-Value pair flat representation
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         *
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         * Creates flat representation of the key-value pair
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         * and pushes it in cleanup stack.
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         * Ownership is transferred to calling method.
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         *
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         * @since 3.0
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         * @return The flat representation of key-value pair
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         */
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		HBufC* KeyValuePairFlatLC();
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		/**
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		 * Checks if the data fits in the flat
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		 * descriptor
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		 *
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		 * @since 3.0
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		 * @return ETrue if data is too big.
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		 */
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		TBool IsDataTooBig() const;
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		/**
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		 * Approximates the value pair data size
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		 * in decimal textual representation
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		 *
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		 * @since 3.0
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		 * @return The value pair data size.
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		 */
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		TInt DataSizeDec() const;
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    private:    // Help functions
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        /**
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         * Resets the value pair data.
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         * @since 3.0
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         */
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        void Reset();
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        /**
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         * Parses value pair data from flat descriptor.
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         * @param aKeyValuePairFlat flat descriptor to parse
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         * @since 3.0
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         */
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        void ParseFlatKeyValuePairL( const TDesC& aKeyValuePairFlat );
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    private:    // Data
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        HBufC16*        iKey;           //OWN: The key.
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        TValueType      iValueType;     //OWN: The value type.
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        union                           //OWN: The value. Value type is determined from iValueType.
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            {
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            TInt        iInt;
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            HBufC8*     iBuf8;
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            HBufC16*    iBuf16;
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            };
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    };
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#endif      // __CVIMPSTSETTINGSKEYVALUEPAIR_H
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//  End of File
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