/*

* 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 CNcdNodePreviewProxy class

*

*/

#ifndef C_NCDNODEPREVIEWPROXY_H

#define C_NCDNODEPREVIEWPROXY_H

// For the streams

#include <s32mem.h>

#include "ncdinterfacebaseproxy.h"

#include "ncdnodepreview.h"

#include "ncddownloadoperationobserver.h"

class CNcdNodeMetadataProxy;

/**

 *  This class implements the functionality for the

 *  MNcdNodeProxy interfaces. The interface is provided for

 *  API users.

 *

 *  @since S60 v3.2

 */

class CNcdNodePreviewProxy : public CNcdInterfaceBaseProxy, 

                             public MNcdNodePreview,

                             public MNcdDownloadOperationObserver

    {

public:

    /**

     * @param aSession The session between the client proxy and the

     * corresponding server object.

     * @param aHandle The handle which identifies the server object

     * that this proxy uses.

     * @param aMetadata Owns and uses the information of this proxy.

     * The node also keeps track of the refence counts of its objects. 

     * And handles the deletion of these objects when the total reference 

     * count reaches zero. 

     * @return CNcdNodePreviewProxy* Pointer to the created object 

     * of this class.

     */

    static CNcdNodePreviewProxy* NewL(

        MCatalogsClientServer& aSession,

        TInt aHandle,

        CNcdNodeMetadataProxy& aMetadata );

    /**

     * @param aSession The session between the client proxy and the

     * corresponding server object.

     * @param aHandle The handle which identifies the server object

     * that this proxy uses.

     * @param aMetadata Owns and uses the information of this proxy.

     * The node also keeps track of the refence counts of its objects. 

     * And handles the deletion of these objects when the total reference 

     * count reaches zero. 

     * @return CNcdNodePreviewProxy* Pointer to the created object 

     * of this class.

     */

    static CNcdNodePreviewProxy* NewLC(

        MCatalogsClientServer& aSession, 

        TInt aHandle,

        CNcdNodeMetadataProxy& aMetadata );

    /**

     * Destructor.

     * The destructor is set public. So, the node that owns this object may

     * delete it directly when the reference count of the node reaches zero

     * and the destructor of the node is called.

     */

    virtual ~CNcdNodePreviewProxy();

    /**

     * @return CNcdNodeMetadataProxy& Gives the metadata proxy that owns this class object.

     * @exception KNcdErrorObsolete if the object has been set as obsolete. Then, we

     * cannot be sure if the original metadata still exists because it is not the parent

     * of this class object anymore.

     */

    CNcdNodeMetadataProxy& MetadataL() const;

    /**

     * Gets the data for descriptors from the server side. This function is

     * called to update proxy data. The function uses the protected virtual

     * internalize functions. So, the child classes may provide their own

     * implementations for internalizations of certain metadata.

     */

    void InternalizeL();

public: // MNcdNodePreview

    /**

     * @see MNcdNodePreview::PreviewCount

     */ 

    TInt PreviewCount() const;

    /**

     * @see MNcdNodePreview::IsPreviewLoaded

     */ 

    TBool IsPreviewLoadedL( TInt aIndex ) const;

    /**

     * @see MNcdNodePreview::PreviewMimeType

     */ 

    const TDesC& PreviewMimeType( TInt aIndex ) const;

    /**

     * @see MNcdNodePreview::LoadPreviewL

     */ 

    MNcdDownloadOperation* LoadPreviewL( TInt aIndex,

        MNcdDownloadOperationObserver* aObserver );

    /**

     * @see MNcdNodePreview::PreviewFileL

     */ 

    RFile PreviewFileL( TInt aIndex ) const;

public: // MNcdDownloadOperationObserver

    /**

     * @see MNcdDownloadOperationObserver::DownloadProgress

     */ 

    void DownloadProgress( MNcdDownloadOperation& aOperation,

        TNcdProgress aProgress );

    /**

     * @see MNcdDownloadOperationObserver::QueryReceived

     */ 

    void QueryReceived( MNcdDownloadOperation& aOperation,

        MNcdQuery* aQuery );

    /**

     * @see MNcdDownloadOperationObserver::OperationComplete

     */ 

    void OperationComplete( MNcdDownloadOperation& aOperation,

        TInt aError );

protected:

    /**

     * Constructor

     *

     * @param aSession The session between the client proxy and the

     * corresponding server object.

     * @param aHandle The handle which identifies the server object

     * that this proxy uses.

     * @param aNode Owns and uses the information of this proxy.

     * The node also keeps track of the refence counts of its objects. 

     * And handles the deletion of these objects when the total reference 

     * count reaches zero.

     * @param aOperationManager This class uses operation manager to get the

     * operations for certain tasks. 

     * @return CNcdNodePreviewProxy* Pointer to the created object 

     * of this class.

     */

    CNcdNodePreviewProxy(

        MCatalogsClientServer& aSession,

        TInt aHandle,

        CNcdNodeMetadataProxy& aMetadata );

    /**

     * ConstructL

     */

    virtual void ConstructL();

    /**

     * @return TBool ETrue if this object has been set as obsolete.

     */

    TBool IsObsolete() const;

    /**

     * @param aObsolete ETrue if the object should be set as obsolete else EFalse.

     */

    void SetObsolete( TBool aObsolete );

    // These functions are used to update the data of this class object

    /**

     * @param aStream This stream will contain all the data content for

     * this class object. The stream is gotten from the server side. The

     * memeber variables will be updated according to the data from

     * the stream. 

     */

    virtual void InternalizeDataL( RReadStream& aStream );

private:

    // Prevent if not implemented

    CNcdNodePreviewProxy( const CNcdNodePreviewProxy& aObject );

    CNcdNodePreviewProxy& operator =( const CNcdNodePreviewProxy& aObject );

private: // data

    CNcdNodeMetadataProxy& iMetadata;

    MNcdDownloadOperationObserver* iOperationObserver;

    TBool iObsolete;

    TInt iPreviewCount;

    RPointerArray<HBufC> iPreviewMimeTypes;

    };

#endif // C_NCD_NODE_PREVIEW_PROXY_H