ncdengine/provider/client/inc/ncdnodepreviewproxy.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 27 Apr 2010 16:46:15 +0300
branchRCL_3
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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:   Contains CNcdNodePreviewProxy class
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*
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*/
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#ifndef C_NCDNODEPREVIEWPROXY_H
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#define C_NCDNODEPREVIEWPROXY_H
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// For the streams
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#include <s32mem.h>
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#include "ncdinterfacebaseproxy.h"
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#include "ncdnodepreview.h"
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#include "ncddownloadoperationobserver.h"
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class CNcdNodeMetadataProxy;
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/**
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 *  This class implements the functionality for the
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 *  MNcdNodeProxy interfaces. The interface is provided for
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 *  API users.
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 *
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 *  @since S60 v3.2
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 */
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class CNcdNodePreviewProxy : public CNcdInterfaceBaseProxy, 
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                             public MNcdNodePreview,
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                             public MNcdDownloadOperationObserver
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    {
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public:
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    /**
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     * @param aSession The session between the client proxy and the
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     * corresponding server object.
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     * @param aHandle The handle which identifies the server object
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     * that this proxy uses.
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     * @param aMetadata Owns and uses the information of this proxy.
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     * The node also keeps track of the refence counts of its objects. 
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     * And handles the deletion of these objects when the total reference 
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     * count reaches zero. 
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     * @return CNcdNodePreviewProxy* Pointer to the created object 
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     * of this class.
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     */
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    static CNcdNodePreviewProxy* NewL(
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        MCatalogsClientServer& aSession,
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        TInt aHandle,
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        CNcdNodeMetadataProxy& aMetadata );
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    /**
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     * @param aSession The session between the client proxy and the
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     * corresponding server object.
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     * @param aHandle The handle which identifies the server object
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     * that this proxy uses.
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     * @param aMetadata Owns and uses the information of this proxy.
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     * The node also keeps track of the refence counts of its objects. 
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     * And handles the deletion of these objects when the total reference 
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     * count reaches zero. 
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     * @return CNcdNodePreviewProxy* Pointer to the created object 
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     * of this class.
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     */
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    static CNcdNodePreviewProxy* NewLC(
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        MCatalogsClientServer& aSession, 
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        TInt aHandle,
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        CNcdNodeMetadataProxy& aMetadata );
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    /**
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     * Destructor.
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     * The destructor is set public. So, the node that owns this object may
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     * delete it directly when the reference count of the node reaches zero
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     * and the destructor of the node is called.
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     */
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    virtual ~CNcdNodePreviewProxy();
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    /**
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     * @return CNcdNodeMetadataProxy& Gives the metadata proxy that owns this class object.
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     * @exception KNcdErrorObsolete if the object has been set as obsolete. Then, we
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     * cannot be sure if the original metadata still exists because it is not the parent
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     * of this class object anymore.
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     */
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    CNcdNodeMetadataProxy& MetadataL() const;
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    /**
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     * Gets the data for descriptors from the server side. This function is
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     * called to update proxy data. The function uses the protected virtual
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     * internalize functions. So, the child classes may provide their own
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     * implementations for internalizations of certain metadata.
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     */
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    void InternalizeL();
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public: // MNcdNodePreview
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    /**
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     * @see MNcdNodePreview::PreviewCount
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     */ 
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    TInt PreviewCount() const;
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    /**
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     * @see MNcdNodePreview::IsPreviewLoaded
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     */ 
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    TBool IsPreviewLoadedL( TInt aIndex ) const;
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    /**
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     * @see MNcdNodePreview::PreviewMimeType
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     */ 
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    const TDesC& PreviewMimeType( TInt aIndex ) const;
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    /**
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     * @see MNcdNodePreview::LoadPreviewL
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     */ 
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    MNcdDownloadOperation* LoadPreviewL( TInt aIndex,
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        MNcdDownloadOperationObserver* aObserver );
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    /**
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     * @see MNcdNodePreview::PreviewFileL
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     */ 
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    RFile PreviewFileL( TInt aIndex ) const;
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public: // MNcdDownloadOperationObserver
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    /**
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     * @see MNcdDownloadOperationObserver::DownloadProgress
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     */ 
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    void DownloadProgress( MNcdDownloadOperation& aOperation,
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        TNcdProgress aProgress );
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    /**
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     * @see MNcdDownloadOperationObserver::QueryReceived
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     */ 
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    void QueryReceived( MNcdDownloadOperation& aOperation,
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        MNcdQuery* aQuery );
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    /**
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     * @see MNcdDownloadOperationObserver::OperationComplete
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     */ 
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    void OperationComplete( MNcdDownloadOperation& aOperation,
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        TInt aError );
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protected:
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    /**
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     * Constructor
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     *
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     * @param aSession The session between the client proxy and the
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     * corresponding server object.
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     * @param aHandle The handle which identifies the server object
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     * that this proxy uses.
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     * @param aNode Owns and uses the information of this proxy.
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     * The node also keeps track of the refence counts of its objects. 
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     * And handles the deletion of these objects when the total reference 
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     * count reaches zero.
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     * @param aOperationManager This class uses operation manager to get the
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     * operations for certain tasks. 
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     * @return CNcdNodePreviewProxy* Pointer to the created object 
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     * of this class.
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     */
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    CNcdNodePreviewProxy(
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        MCatalogsClientServer& aSession,
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        TInt aHandle,
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        CNcdNodeMetadataProxy& aMetadata );
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    /**
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     * ConstructL
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     */
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    virtual void ConstructL();
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    /**
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     * @return TBool ETrue if this object has been set as obsolete.
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     */
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    TBool IsObsolete() const;
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    /**
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     * @param aObsolete ETrue if the object should be set as obsolete else EFalse.
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     */
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    void SetObsolete( TBool aObsolete );
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    // These functions are used to update the data of this class object
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    /**
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     * @param aStream This stream will contain all the data content for
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     * this class object. The stream is gotten from the server side. The
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     * memeber variables will be updated according to the data from
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     * the stream. 
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     */
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    virtual void InternalizeDataL( RReadStream& aStream );
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private:
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    // Prevent if not implemented
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    CNcdNodePreviewProxy( const CNcdNodePreviewProxy& aObject );
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    CNcdNodePreviewProxy& operator =( const CNcdNodePreviewProxy& aObject );
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private: // data
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    CNcdNodeMetadataProxy& iMetadata;
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    MNcdDownloadOperationObserver* iOperationObserver;
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    TBool iObsolete;
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    TInt iPreviewCount;
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    RPointerArray<HBufC> iPreviewMimeTypes;
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    };
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#endif // C_NCD_NODE_PREVIEW_PROXY_H