/*

* Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    This is the base class for Gallery Collection Plugins

*

*/

#ifndef C_GLXCOLLECTIONPLUGINBASE_H

#define C_GLXCOLLECTIONPLUGINBASE_H

// INCLUDES

#include <e32cmn.h>

#include <mpxcollectionplugin.h>

#include <glxcollectiongeneraldefs.h>

#include <glxfilterproperties.h>

#include <glxmediaid.h>

#include "glxrequest.h"

#include "mglxdatasourcerequestobserver.h"

#include "mglxdatasourceupdateobserver.h"

// FORWARD DECLARATIONS

class MGlxDataSource;

class CGlxStringCache;

// CONSTANTS

const TInt KGlxCollectionRootLevel = 1;

const TUid KGlxDefaultDataSourceUid = {0x20000A10}; // KGlxDataSourceMdeImplementationUid

// CLASS DECLARATION

/**

 *	CGlxCollectionPluginBase class 

 *

 *	Plug-in base.

 *	@ingroup collection_component_design

 *  @internal reviewed 11/07/2007 by Dave Schofield

 */

class CGlxCollectionPluginBase : public CMPXCollectionPlugin,

		public MGlxDataSourceRequestObserver,

		public MGlxDataSourceUpdateObserver

    {

public: // Constructors and destructor

    /**

    * Constructor

    */

    IMPORT_C CGlxCollectionPluginBase();

    /**

    * Destructor

    */

    IMPORT_C virtual ~CGlxCollectionPluginBase();

private: // Functions from base classes

// from CMPXCollectionPlugin

    /** 

    * DEPRECATED, Executes a command on the selected collection

    *

    * @param aCmd a command

    * @param aArg optional argument

    */

    IMPORT_C void CommandL(TMPXCollectionCommand aCmd, TInt aArg = 0);

    /** 

    * Executes a command

    *

    * @param aCmd a command

    */

    IMPORT_C void CommandL(CMPXCommand& aCmd); 

    /** 

    * Navigates to the given path

    *

    * @param aPath a path

    * @param aAttrs, attributes requested

    * @param aFilter, filter to apply or NULL if none

    */

    IMPORT_C void OpenL(const CMPXCollectionPath& aPath,

                   const TArray<TMPXAttribute>& aAttrs,

                   CMPXFilter* aFilter); 

    /** 

    *  Media properties of the current file (async)

    *  Note: if selection is set in aPath, HandleMedia will return an array of 

    *        media properties of current selected items.

    *        if no selection is set in aPath, HandleMedia will return media 

    *        properities of current item.

    *

    * @param aPath path for the media file

    * @param aAttr attributes requested

    * @param aCaps platsec capabilities of client requesting media; plug-in should also

    *        verify its process capabilities

    * @aParam aSpecs, specifications for attributes

    */

    IMPORT_C void MediaL(const CMPXCollectionPath& aPath, 

                        const TArray<TMPXAttribute>& aAttrs,

                        const TArray<TCapability>& aCaps,

                        CMPXAttributeSpecs* aSpecs);

    /** 

    * Cancel outstanding request

    */

    IMPORT_C void CancelRequest();

    /**

    *  Adds an item or items to the collection

    *

    *  @param aNewProperties, Properties of the item

    */

    IMPORT_C void AddL(const CMPXMedia& aNewMedia);

    /**

    * Remove a collection path

    * Note that the selection indicies are hidden within the path

    * @param aPath, path to remove

    *

    */

    IMPORT_C void RemoveL(const CMPXCollectionPath& aPath );

    /**

    *  Remove an item or items from the collection

    *

    *  @param aProperties, Properties of the item. It may cantain URI only

    *                      or meta data, all of items matched properties 

    *                      will be removed.

    */

    IMPORT_C void RemoveL(const CMPXMedia& aMedia);

    /**

    *  Sets/updates the media for the item

    *  specified in the path

    *

    *  @param aMedia, new value

    */

    IMPORT_C void SetL(const CMPXMedia& aMedia);

    /**

    *  Find a list of items matched (async)

    *

    *  @param aCriteria, properties to be searched

    *  @param aAttrs, attributes to return

    */

    IMPORT_C void FindAllL(const CMPXSearchCriteria& aCriteria, 

                          const TArray<TMPXAttribute>& aAttrs);

    /**

    * Find a list of items matched (sync)

    *

    *  @param aCriteria, properties to be searched

    *  @param aAttrs, attributes to return

    *  @return results of the search        

    */

    IMPORT_C CMPXMedia* FindAllSyncL(const CMPXSearchCriteria& aCriteria,

                                    const TArray<TMPXAttribute>& aAttrs);

    /**

    * Get the list of supported capabilities

    * @return TCollectionCapability, bitmask of supported capabilities

    */

    IMPORT_C TCollectionCapability GetCapabilities();

private:

// from MGlxDataSourceRequestObserver	

	/**

	 * Asynchronous call to retrieve 

	 * 

	 * @param aListId list for this query relates to

	 * @return error code

	 */

	IMPORT_C virtual void HandleResponse(CMPXMedia* aResponse, CGlxRequest* aRequest, const TInt& aError);

private:

// from MGlxDataSourceUpdateObserver

	/**

	 * Notification that new items have been found in the data source (file 

	 * system, etc.)

	 *

	 * @param aItems ids of the items that were been found. 

	 */

	 IMPORT_C virtual void HandleMessage(CMPXMessage& aMessage);

protected:

	CGlxRequest* GetRequestFactoryL(const CMPXCollectionPath& aPath, const TArray<TMPXAttribute>& aAttrs);

	/**

	 * Checks to see if any additional attributes are required to construct required

	 * CPI specific attribute

	 *

	 * @param aCpiAttribute CPI specific attribute to be constructed later

	 * @param aAttributeArray modifiable list of attributes to be retrieved from data source

	 */	 

	/**

	 * Modifies the response to include all requested CPI specific attributes or Leaves.

	 *

	 * @param aResponse Data Source constructed response to which CPI specific attributes should be added (also contains any required data)

	 * @param aCpiAttributes list of CPI specific attributes to be constructed

	 * @param aMediaIds list of CPI specific media Ids

	 */	 

	IMPORT_C virtual void HandleCpiAttributeResponseL(CMPXMedia* aResponse, TArray<TMPXAttribute> aCpiAttributes, TArray<TGlxMediaId> aMediaIds);

	IMPORT_C virtual TBool IsUpdateMessageIgnored(CMPXMessage& aMessage);

	/**

	 * Loads a string from a resurce file

	 *

	 * @param aResourceFile - name of the resource file (does not contain the path).

	 * @param aResourceId - Id of the string to be loaded

	 * @return HBufC* containing the required string.

	 */	 

    IMPORT_C HBufC* LoadLocalizedStringLC(const TDesC& aResourceFile, const TInt aResourceId);

    IMPORT_C virtual TGlxFilterProperties DefaultFilter(TInt aLevel);

protected: 

	/**

	 * Datasouce (owned)

	 */

 	MGlxDataSource* iDataSource;

 	/**

 	 * collection plugin path (owned)

 	 */

 	CMPXCollectionPath* iPath;

private:

    /**

 	 * String Cache

 	 */ 	    

    CGlxStringCache*    iStringCache;

    };

#endif      // C_GLXCOLLECTIONPLUGINBASE_H