musichomescreen_multiview/musiccontentpublisher/inc/musiccontentmap.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 31 Mar 2010 21:26:33 +0300
branchRCL_3
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permissions -rw-r--r--
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/*
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* Copyright (c) 2008-2008 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:  Manages MCP plugins, and content publishing.
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*
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*/
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#ifndef C_MUSICCONTENTMAP_H
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#define C_MUSICCONTENTMAP_H 
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#include <liwvariant.h>
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#include <e32hashtab.h>
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// CLASS DECLARATION
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/**
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* Data class to construct and hold variant values persistently.
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*/
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class RMusicContentVariant {
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  public:
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    /**
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     * Constructor
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     *
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     * Constructs a null variant value.
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     */
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    RMusicContentVariant();
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    /**
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     * Reset variant to null value.
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     * Frees content.
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     */
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    void Reset();
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    /**
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     * Set variant to integer value.
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     * @param New value.
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     * @return Whether the value was changed.
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     * Frees content of previous value.
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     */
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    TBool SetL( TInt aInt);
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    /**
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     * Set variant to string value.
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     * @param New value. An internal copy of the string is made.
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     * @return Whether the value was changed.
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     * Frees content of previous value.
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     */
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    TBool SetL( const TDesC& aDesc );
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    /**
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     * Set variant to map value.
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     * @param New value. Reference counter of the map is increased.
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     * @return Whether the value was changed.
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     * Frees content of previous value.
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     */
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    TBool SetL( CLiwMap * aMap );
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    /**
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     * Check whether value has been modified since the last ResetModified.
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     * @return ETrue if value has been modified.
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     */
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    TBool IsModified() const;
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    /**
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     * Reset modified flag.
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     * After calling this method IsModified returns EFalse.
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     */
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    void ResetModified();
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    /**
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     * Return whether the value is null.
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     * @return ETrue if value is null.
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     */
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    TBool IsNull() const;
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    /**
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     * Return the value as TLiwVariant
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     * @return Value encapsulated in TLiwVariant.
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     */
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    TLiwVariant LiwVariant() const;
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  private:
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  	enum TType {ETypeNull, ETypeInt, ETypeBufC, ETypeMap};
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    TType   iType; // type of the value
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    TBool   iModified; // whether value has been modified
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    // Data area
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    union {
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    	TInt      iInt;
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    	HBufC   * iBufC; // owned
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    	CLiwMap * iMap;  // reference counted
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    } iValue;
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};
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// CLASS DECLARATION
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/**
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 *  Persistent map of variable content
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 *
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 *  @lib musiccontentpublisher.dll
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 *  @since S60 S60 v5.0
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 */
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class RMusicContentMap {
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  public:
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    /**
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     * Constructs an empty map
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     */
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    RMusicContentMap();
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    /**
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     * Resets a single value in the map in case it exists
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     * @param aKey The key of the value to be reset
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     * Does nothing if the value does not exist
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     */
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    void Reset( TPtrC8 aKey );
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    /**
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     * Sets a string value in the map
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     * @param aKey The key of the value
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     * @param aValue The value for the key. The string is copied.
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     */
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    void SetL( TPtrC8 aKey, const TDesC& aValue );
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    /**
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     * Sets an integer value in the map
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     * @param aKey The key of the value
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     * @param aValue The value for the key.
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     */
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    void SetL( TPtrC8 aKey, const TInt& aValue );
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    /**
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     * Sets an map value in the map
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     * @param aKey The key of the value
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     * @param aValue The value for the key. The reference count of the map is increased.
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     */
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    void SetL( TPtrC8 aKey, CLiwMap * aMap ); 
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    /**
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     * Check whether value has been modified since last reading the values.
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     * @return ETrue if value has been modified.
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     */
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    TBool IsModified() const;
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    /**
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     * Reads all those entries from the map that have been modified
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     * since previous reading of values. Null values are not read.
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     *
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     * @return A freshly allocated map with modified values. Null is returned if there are no modifications.
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     */
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    CLiwMap * GetModifiedLC ();
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    /**
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     * Reads all non-null entries from the map.
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     *
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     * @return aMap  A freshly allocated map with entries. Null is returned if map is empty.
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     */
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    CLiwMap * GetAllLC();
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    /**
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     * Closes the map discarding all its content.
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     */
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    void Close();
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  private:
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  	RMusicContentVariant& AtL (TPtrC8 aKey);
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  	RHashMap<TPtrC8, RMusicContentVariant> iMap;
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  	TBool                                  iModified;
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};
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#endif