mpxplugins/serviceplugins/collectionplugins/mpxinmemoryplugin/inc/mpxinmemoryplugin.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 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:  Simple plugin to cache media objects
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*
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*/
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#ifndef CMPXINMEMORYPLUGIN_H
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#define CMPXINMEMORYPLUGIN_H
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// INCLUDES
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#include <e32cmn.h>
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#include <mpxcollectionplugin.h>
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#include <mpxcollectionmessagedefs.h>
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// FORWARD DECLARATIONS
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class CMPXMedia;
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class CMPXMediaArray;
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class CMPXDrmMediaUtility;
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// CONSTANTS
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// CLASS DECLARATION
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/**
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*  CMPXInMemoryPlugin class 
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*
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*  Plug-in basically provides temporary in memory browsing
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*  @lib mpxinmemoryplugin.lib
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*/
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NONSHARABLE_CLASS(CMPXInMemoryPlugin) : public CMPXCollectionPlugin
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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 aInitParams, initialization parameter
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    * @return object of constructed
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    */
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    static CMPXInMemoryPlugin* NewL();
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    /**
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    * Destructor
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    */
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    virtual ~CMPXInMemoryPlugin();
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protected: // Functions from base classes
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    /**
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    *  from CMPXCollectionPlugin
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    */
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    /** 
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    * From CMPXCollectionPlugin
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    * Navigates to the given path
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    * @param aPath: a path
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    * @param aAttrs, attributes requested
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    * @param aFilter, filter to apply or NULL if none
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    */
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    void OpenL(const CMPXCollectionPath& aPath,
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               const TArray<TMPXAttribute>& aAttrs,
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               CMPXFilter* aFilter); 
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    /**
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    * From CMPXCollectionPlugin     
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    * Get the extended properties of the current file (async)
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    * @param aPath: a path   
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    * @param aAttrs: array of attributes requested             
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    * @param aCaps platsec capabilities of client requesting media; plug-in should also
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    *        verify its process capabilities
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    * @aParam aSpecs, specifications for attributes
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    */
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    void MediaL(const CMPXCollectionPath& aPath, 
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                const TArray<TMPXAttribute>& aAttrs,
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                const TArray<TCapability>& aCaps,
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                CMPXAttributeSpecs* aSpecs);
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    /** 
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    * Cancel outstanding request
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    */
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    void CancelRequest();
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    /** 
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    * Executes a command on the selected collection
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    *
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    * @param aCmd a command
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    */
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    void CommandL(TMPXCollectionCommand aCmd, TInt aArg);
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    /**
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    * From CMPXCollectionPlugin
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    */
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    void CommandL(CMPXCommand& aCmd);
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    /**
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    *  Adds item(s) to the collection
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    *
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    *  @param aNewProperties, Properties of the item
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    */
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    void AddL(const CMPXMedia& aNewMedia);
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    /**
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    * Remove a collection path
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    * @param aPath, path to remove
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    *
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    */
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    void RemoveL(const CMPXCollectionPath& aPath );
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    /**
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    *  Remove an item or items from the collection
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    *
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    *  @param aProperties, Properties of the item. It may cantain URI only
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    *                      or meta data, all of items matched properties 
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    *                      will be removed.
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    */
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    void RemoveL(const CMPXMedia& aMedia);
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    /**
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    *  Sets/updates the media for the item
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    *  specified in the path
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    *
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    *  @param aMedia, new value
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    */
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    void SetL(const CMPXMedia& aMedia);
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    /**
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    *  Find a list of items matched 
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    *
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    *  @param aMedia, properties to be searched
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    *  @param aAttrs, attributes to return from find
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    */
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    void FindAllL(const CMPXMedia& aMedia, const TArray<TMPXAttribute>& aAttrs);
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    /**
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    * Find a list of items matched (sync)
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    *
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    *  @param aMedia, properties to be searched
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    *  @param aAttrs, attributes to return
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    *  @return results of the search        
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    */
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    CMPXMedia* FindAllSyncL(const CMPXMedia& aMedia,
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                            const TArray<TMPXAttribute>& aAttrs);
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    /**
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    * Get the list of supported capabilities
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    *
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    * @return TCollectionCapability, bitmask of supported capabilities
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    */
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    TCollectionCapability GetCapabilities();
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protected: // New Functions
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    /**
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    * Send change events back to the observer
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    * @param aId, embedded context that was changed
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    * @param aChange, change type
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    */
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    void HandleChangeL(const TMPXItemId& aId, TMPXChangeEventType aChange );
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    /**
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    * Internal function to Add a Media
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    * @param aMedia media to add
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    */
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    void DoAddL( const CMPXMedia& aMedia );
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    /**
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    * Internal function to Set a Media
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    * @param aMedia media to set
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    */
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    void DoSetL( const CMPXMedia& aMedia );
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protected: 
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    /**
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    * Constructor
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    */
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    CMPXInMemoryPlugin();
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    /**
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    *  2nd phase constructor
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    */
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    void ConstructL();
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protected:
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    CMPXDrmMediaUtility*     iDrmMediaUtility;
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    RPointerArray<CMPXMedia> iTemporaryData;
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    RArray<TInt>             iEmbeddedContext;
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    };
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#endif      // CMPXINMEMORYPLUGIN_H
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