/*

* Copyright (c) 2006 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:   Contains CNcdNodePreview class

*

*/

#ifndef NCD_NODE_PREVIEW_H

#define NCD_NODE_PREVIEW_H

// For streams

#include <s32mem.h>

#include "ncdcommunicable.h"

#include "ncdstoragedataitem.h"

#include "ncdnodeclassids.h"

class MNcdPreminetProtocolDataEntity;

class CNcdNodeManager;

class CNcdNodeMetaData;

/**

 *  This server side class contains the data and the functionality

 *  that the proxy objects will use to internalize itself.

 *

 *  This object should be added to the session. So, it will be usable

 *  in the proxy side by using the handle gotten during addition. 

 *  The handle is used to identify to what object the proxy directs 

 *  the function call.  When objects are added to sessions, 

 *  multiple handles may be gotten for the same object if addition is 

 *  done multiple times.

 *

 *  @lib ?library

 *  @since S60 ?S60_version *** for example, S60 v3.0

 */

class CNcdNodePreview : public CNcdCommunicable,

                        public MNcdStorageDataItem

    {

public:

    /**

     * NewL

     *

     * @return CNcdNodePreview* Pointer to the created object 

     * of this class.

     */

    static CNcdNodePreview* NewL( CNcdNodeMetaData& aParentMetaData,

                                  CNcdNodeManager& aNodeManager );

    /**

     * NewLC

     *

     * @return CNcdNodePreview* Pointer to the created object 

     * of this class.

     */

    static CNcdNodePreview* NewLC( CNcdNodeMetaData& aParentMetaData,

                                   CNcdNodeManager& aNodeManager );

    /**

     * Destructor

     *

     * @note Because this is CCatalogsCommunicable function the

     * session that owns this object should delete this class object.

     * So, instead of directly deleting this object from some other

     * class. Close-method should be used instead.

     */

    virtual ~CNcdNodePreview();

    /**

     * Retrieves the data type that informs what class the data is for.

     * By checking the data type information, an InternalizeL function

     * of a right class can be called when the object data is set

     * from the storage.

     * The data type may be decided and set in a object that creates this 

     * class object.

     *

     * @return NcdNodeClassIds::TNcdNodeClassId Describes the data type. 

     */

    NcdNodeClassIds::TNcdNodeClassId ClassId() const;

    /**

     * This function is called when the owner of this object

     * wants to internalize the content according to the data

     * that has been received from the parser.

     * 

     * @param aData The data is set in the protocol parser and can

     * be used to initialize this class object.

     */

    void InternalizeL( MNcdPreminetProtocolDataEntity& aData );

    /**

     * URI count getter

     *

     * @return Number of available preview URIs

     */

    TInt UriCount() const;

    /**

     * URI getter

     *

     * @param aIndex URI index

     * @return URI

     */

    const TDesC& Uri( TInt aIndex ) const;

    /**

     * Updates preview MIME types from preview manager in case

     * they were not received in protocol responses

     */

    void UpdateMimesFromPreviewManagerL();

public: // MNcdStorageDataItem 

    // These functions are used to get the data from and to insert the data

    // into the database using by the given stream.

    /**

     * @see MNcdStorageDataItem::ExternalizeL

     */

    virtual void ExternalizeL( RWriteStream& aStream );

    /**

     * @see MNcdStorageDataItem::InternalizeL

     */

    virtual void InternalizeL( RReadStream& aStream );

public: // CCatalogsCommunicable

    /**

     * @see CCatalogsCommunicable::ReceiveMessage

     */

    virtual void ReceiveMessage( MCatalogsBaseMessage* aMessage,

                                 TInt aFunctionNumber );

    /**

     * @see CCatalogsCommunicable::CounterPartLost

     */

    virtual void CounterPartLost( const MCatalogsSession& aSession );

protected:

    /**

     * Constructor

     * @param aClassId Identifies this class. 

     * Is set in the NewLC function 

     */

    CNcdNodePreview( NcdNodeClassIds::TNcdNodeClassId aClassId, 

                     CNcdNodeMetaData& aParentMetaData,

                     CNcdNodeManager& aNodeManager );

    /**

     * ConstructL

     */

    virtual void ConstructL();

    // These functions are called from the ReceiveMessage when

    // the given function id has matched to the function.

    /**

     * This function is called when the proxy wants to get the

     * data from the serverside. This function calls the

     * InternalizeDataForRequestL which may be overloaded in the

     * child classes

     * @param aMessage Contains data from the proxy and can be used

     * to send data back to proxy

     */

    void InternalizeRequestL( MCatalogsBaseMessage& aMessage );

    /**

     * This function writes the object data to the stream. 

     * The stream content will be sent to the proxy that requested the data.

     * Child classes should add their own data after this parent data.

     * @param aStream The data content of this class object will be written

     * into this stream.

     */

    virtual void ExternalizeDataForRequestL( RWriteStream& aStream );

    /**

     * This function is called from the proxy side. When the proxy

     * is deleted.

     * @param aMessage Contains data from the proxy and can be used

     * to send data back to proxy

     */

    void ReleaseRequest( MCatalogsBaseMessage& aMessage ) const;

    /**

     * Opens a preview file

     * @param aMessage

     */

    void OpenPreviewFileL( MCatalogsBaseMessage& aMessage );

    /**

     * Checks if a preview has been loaded

     * @param aMessage

     */

    void IsPreviewLoadedL( MCatalogsBaseMessage& aMessage );

private:

    // Prevent these two if they are not implemented

    CNcdNodePreview( const CNcdNodePreview& aObject );

    CNcdNodePreview& operator =( const CNcdNodePreview& aObject );

private: // data

    // The class id identifies this class. The id may be used to identify

    // what kind of class object is created when data is gotten from the db.

    NcdNodeClassIds::TNcdNodeClassId iClassId;

    CNcdNodeMetaData& iParentMetaData;

    CNcdNodeManager& iNodeManager;

    // The message is set when ReceiveMessage is called. The message

    // is used in the CounterPartLost-function that informs the message

    // if the session has been lost.

    MCatalogsBaseMessage* iMessage;

    HBufC* iNameSpace;

    TInt iFileCount;

    RPointerArray<HBufC> iPreviewMimeTypes;

    RPointerArray<HBufC> iUris;

    };

#endif // NCD_NODE_PREVIEW_H