author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 02 Feb 2010 00:10:37 +0200 | |
changeset 4 | 57d388cc48c1 |
parent 0 | 4e91876724a2 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2008-2009 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: Cache implementation for media items sharing the same Id space |
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* |
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*/ |
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#ifndef C_GLXCACHE_H |
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#define C_GLXCACHE_H |
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#include <e32base.h> |
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#include "glxmediaid.h" |
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// Forward declarations |
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class CMPXMedia; |
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class CGlxMedia; |
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class T_CacheTestHelpers; |
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class TMPXAttribute; |
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class CGlxCacheManager; |
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/** |
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* CGlxCache |
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* |
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* Individual cache of media items sharing the same Id space |
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*/ |
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NONSHARABLE_CLASS( CGlxCache ) : public CBase |
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{ |
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public: |
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/** |
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* Constructor |
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* @param aIdSpaceId The id of the id address space of this cache |
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* @param aCacheManager Instance of cachemanager to cleanup the media |
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*/ |
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CGlxCache( const TGlxIdSpaceId& aIdSpaceId, CGlxCacheManager* aCacheManager ); |
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/** |
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* Destructor |
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*/ |
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~CGlxCache(); |
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/** |
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* Returns the Id space covered by this cache |
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* @return The Id space covered by this cache |
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*/ |
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TGlxIdSpaceId IdSpaceId() const; |
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/** |
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* Notify the cache that attributes have changed on media item(s) |
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* @param aMedia The updated media item or array of updated media items |
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*/ |
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void MediaUpdatedL( const CMPXMedia& aMedia ); |
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/** |
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* Update media item |
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* |
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* @param aMedia The updated media item |
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*/ |
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void UpdateMediaL( const CMPXMedia& aMedia ); |
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/** |
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* Cleanup the media of the given media id: broadcast this to all observers |
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* @param aMediaId The media id of the item |
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*/ |
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void CleanupMedia(const TGlxMediaId& aMediaId); |
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/** |
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* Handles modifications of item in cache |
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* |
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* @param aId Media item id |
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* @param aAttributes Attributes that have been modified |
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*/ |
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void HandleItemModified( const TGlxMediaId& aId, const RArray<TMPXAttribute>& aAttributes ); |
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/** |
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* Access to the items stored in the cache: return the item matching the given media Id |
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* @param aId The media Id |
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* @return The media item, or NULL if not found |
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*/ |
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CGlxMedia* Media( const TGlxMediaId& aId ) const; |
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/** |
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* Access to the items stored in the cache: return the item matching the given media Id. |
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* If not found, a new item is created |
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* @param aId The media Id |
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* @return The media item |
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*/ |
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CGlxMedia* FindItemForceCreateL( const TGlxMediaId& aId ); |
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/** |
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* Number of items in cache |
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* @return Number of items in cache |
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*/ |
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TInt Count(); |
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/** |
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* Cached item by index |
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* @param aIndex index of the item |
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* @return Cached item |
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*/ |
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CGlxMedia& Media( TInt aIndex ); |
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/** |
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* Delete an item at index from the cache. |
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* @param aIndex Index of the item to delete |
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*/ |
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void Delete( TInt aIndex ); |
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/** |
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* Reserve space for a number of users, for all items in the cache |
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* |
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* @param aCount The number of users to reserve space for |
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*/ |
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void ReserveUsersL( TInt aCount ); |
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/** |
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* Finds the media index present in cache |
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* @returns the index of media |
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*/ |
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TInt FindMediaIndexInCache(TGlxMediaId aMediaId); |
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private: |
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/** |
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* Copy the new and modified attributes from aSource to aTarget |
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* @param aTarget The target media item |
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* @param aSource The source media item |
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* @param aNewAttributes The new and modified attributes |
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*/ |
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void CopyNewAndModifiedL( CGlxMedia& aTarget, const CMPXMedia& aSource, |
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RArray<TMPXAttribute>& aNewAttributes ); |
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|
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/** |
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* Function for TLinearOrder() for comparing two CGlxMedias |
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* Used from ordering the iItemPool by id |
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* @param aItem1 The first item to compare |
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* @param aItem2 The second item to compare |
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* @return -1 if aItem1 < aItem2; 1 if aItem1 > aItem2; 0 if aItem1 == aItem2 |
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*/ |
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static TInt MediaItemOrderById( const CGlxMedia& aItem1, const CGlxMedia& aItem2 ); |
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|
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/** |
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* Function for comparing a TGlxMediaId with a CGlxMedia |
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* Used from ordering iItemPool by media id |
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* @param aMediaId The media id to compare against aItem2 |
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* @param aItem2 The second item to compare |
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* @return -1 if aMediaId < aItem2.Id(); 1 if aMediaId > aItem2.Id(); 0 if aMediaId == aItem2.Id() |
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*/ |
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static TInt MediaItemOrderByKey( const TGlxMediaId* aMediaId, const CGlxMedia& aItem2 ); |
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|
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/** |
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* Create and add an item to the item pool |
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* @param aId Id for the new item |
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* @return Pointer to the created item |
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*/ |
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CGlxMedia* CreateItemL( const TGlxMediaId& aId ); |
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|
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private: |
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/// Id space that this cache covers |
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TGlxIdSpaceId iIdSpaceId; |
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|
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/// Pool of media items. Owned |
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RPointerArray<CGlxMedia> iItemPool; |
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|
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///Instance of cacheManager to cleanup cache |
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CGlxCacheManager* iCacheManager; |
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|
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friend class T_CacheTestHelpers; |
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}; |
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#endif // C_GLXCACHE_H |