mpserviceplugins/mpxsqlitedbhgplugin/inc/mpxdbalbum.h
author William Roberts <williamr@symbian.org>
Fri, 11 Jun 2010 16:24:02 +0100
branchGCC_SURGE
changeset 30 b95ddb5a0d10
parent 25 3ec52facab4d
child 29 8192e5b5c935
permissions -rw-r--r--
Branch for GCC_SURGE fixes
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/*
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* Copyright (c) 2007 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:  This class is responsible for all category tables (Artist,
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*                Album, Genre, Composer).
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*
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*
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*/
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#ifndef MPXDBALBUM_H
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#define MPXDBALBUM_H
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// INCLUDES
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#include "mpxdbcategory.h"
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// CLASS DECLARATION
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class MMPXDbAlbumObserver
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    {
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    public:
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        virtual TInt HandleIsUnknownArtistL(TUint32 aId) = 0;
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        virtual TUint32 HandleArtistForAlbumL( const TUint32 aId ) = 0;
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    };
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/**
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* Responsible for managing all music databases
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*
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* @lib MPXDbPlugin.lib
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*/
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class CMPXDbAlbum :
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    public CMPXDbCategory
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    {
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    public:
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        /**
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        * Two-phased constructor.
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        * @param aDbManager database manager to use for database interactions
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        * @param aCategory identifies the category
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        * @return New CMPXDbCategory instance.
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        */
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        static CMPXDbAlbum* NewL(CMPXDbManager& aDbManager,
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            TMPXGeneralCategory aCategory, MMPXDbAlbumObserver& aObserver);
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        /**
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        * Two-phased constructor.
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        * @param aDbManager database manager to use for database interactions
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        * @param aCategory identifies the category
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        * @return New CMPXDbCategory instance on the cleanup stack.
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        */
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        static CMPXDbAlbum* NewLC(CMPXDbManager& aDbManager,
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            TMPXGeneralCategory aCategory, MMPXDbAlbumObserver& aObserver);
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        /**
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        * Destructor
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        */
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        virtual ~CMPXDbAlbum();
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    public:
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        /**
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        * Add a category item. If the record already exists, its counter will
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        * be incremented.
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        * @param aName: This is the name to be entered into the row
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        * @param aDriveId: The Drive Id the name (category) belongs
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        * @param aNewRecord: indicates to the caller if a new record is created.
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        *        ETrue if a new row is created in the table; otherwise EFalse.
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        * @param aCaseSensitive indicates whether case sensitivity should be taken
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        *        into consideration when generating the unique row id
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        * @return The unique id of the row added.
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        */
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        TUint32 AddItemL(const TDesC& aName, TUint32 aArtist, const TDesC& aArt, TInt aDriveId, TBool& aNewRecord,
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            TBool aCaseSensitive = ETrue);
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        /**
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        * Decrement the number of songs for the item. If the count gets to 0, remove
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        * the item.
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        * @param aId: The ID of the category to delete.
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        * @param aDriveId: The drive Id the name (category) belongs to. Songs on different
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        *                  drives may belong to the same album or artist; consequently, one
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        *                  row for each artist/album id and drive ID pair will exist in the
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        *                  lookup table with a count existing for each row that tracks the
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        *                  number number of songs on that drive with that album/artist.
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        * @param aItemChangedMessages if valid on return contains a deleted message if the
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        *                  category was deleted
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        * @param aItemExist Out parameter, ETrue if the category is not deleted after the delete,
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        *        EFalse otherwise
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		* @param aArtist: The ID of the artist
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        */
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        void DecrementSongsForCategoryL(TUint32 aId, TInt aDriveId,
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            CMPXMessageArray* aItemChangedMessages, TBool& aItemExist, const TUint32 aArtist);
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		/**
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	* Gets the details for all category items.
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	* @param aAttrs attributes to be returned
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	* @param aMediaArray returns the requested attributes for all items
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	*/
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		void GetAllCategoryItemsL(const TArray<TMPXAttribute>& aAttrs,
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			CMPXMediaArray& aMediaArray);
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		/**
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	* Update a category item.
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	* @param aId: The ID of the category to update
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	* @param aMedia: The media data
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	* @param aDriveId: The Drive Id the name (category) belongs
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	* @param aItemChangedMessages: if valid on return contains a updated message if the
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    *        category was updated
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	*/
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		void UpdateItemL(TUint32 aId, const CMPXMedia& aMedia, TInt aDriveId, CMPXMessageArray* aItemChangedMessages);
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	public:
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		/**
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	* Get albums count for a specified artist
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	* @param aId: The ID of the artist
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	*/
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	    TInt GetAlbumsCountForArtistL(TUint32 aArtistId);
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		/**
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	* Get songs count for a specified album and a specified artist
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	* @param aArtistId: The ID of the artist
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	* @param aAlbumId: The ID of the album
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	*/
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		TInt GetSongsCountInAlbumMatchingArtistL(TUint32 aArtistId, TUint32 aAlbumId);
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    private:
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        /**
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        * Updates the media with information from the table
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        * @param aRecord record containing the source fields
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        * @param aAttrs attributes to be returned
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        * @param aMedia returns the requested attributes
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        */
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        void UpdateMediaL(RSqlStatement& aRecord, const TArray<TMPXAttribute>& aAttrs,
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            CMPXMedia& aMedia);
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         /**
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        * Generate searching criteria for album table from the given criteria
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        * @param aMedia media data
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        * @param aFields fields of Album table
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        * @param aValues values of each field of Album table
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        * @return a string containing the selection criteria. The ownership is passed to the caller.
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        */
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		void GenerateAlbumFieldsValuesL(const CMPXMedia& aMedia,
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			CDesCArray& aFields, CDesCArray& aValues);
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		TBool IsUnknownArtistL(TUint32 aId);
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		TUint32 ArtistForAlbumL(const TUint32 aId);
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    private:    // from MMPXTable
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        /**
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        * @see MMPXTable
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        */
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        virtual void CreateTableL(RSqlDatabase& aDatabase, TBool aCorruptTable);
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        /**
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        * @see MMPXTable
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        */
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        virtual TBool CheckTableL(RSqlDatabase& aDatabase);
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    private:
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        /**
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        * C++ constructor.
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        * @param aDbManager database manager to use for database interactions
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        * @param aCategory identifies the category
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        */
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        CMPXDbAlbum(CMPXDbManager& aDbManager, TMPXGeneralCategory aCategory, MMPXDbAlbumObserver& aObserver);
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        /**
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        * Second phase constructor.
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        */
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        void ConstructL();
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    public:
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        /**
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        * Column indexes in the category tables
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        */
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        enum TAlbumColumns
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            {
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            EAlbumUniqueId = KMPXTableDefaultIndex,
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            EAlbumName,
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            EAlbumSongCount,
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            EAlbumArtist,
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            EAlbumArt,
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            EAlbumArtistName,
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            EAlbumFieldCount
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            };
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    private:    // Data
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        MMPXDbAlbumObserver& iObserver;
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    };
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#endif // MPXDBALBUM_H
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// End of File