/*

* Copyright (c) 2006-2008 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:   MNcdDependencyInfo

*

*/

#ifndef NCD_NODE_DEPENDENCY_INFO

#define NCD_NODE_DEPENDENCY_INFO

#include <e32cmn.h>

#include "ncdnodedependency.h"

class MNcdNode;

/**

 *  This interface provides functions to get information about dependency

 *  nodes or dependency content.

 *

 *  This interface is also present when the node depends on some free

 *  downloadable content. In that case, DependencyNodeL() will return 

 *  a NULL pointer.

 *

 *  @see MNcdNodeDependency

 *  @see MNcdNode

 *

 *  

 */

class MNcdNodeDependencyInfo

{

public:

    /** 

     * @return const TDesC& Name of the dependency content.

     *         If the protocol has not defined any value, 

     *         an empty string is returned.

     */

    virtual const TDesC& Name() const = 0;

    /** 

     * @return const TDesC& Version of the dependency content.

     *         If the protocol has not defined any value, 

     *         an empty string is returned.

     */

    virtual const TDesC& Version() const = 0;

    /** 

     * This function is the indicative Symbian application UID for the

     * contents that are applications. This can be used e.g. for checking

     * if the application has already been installed to the phone.

     *    

     * @return TUid Uid of the dependency content.

     */

    virtual TUid Uid() const = 0;

    /** 

     * @return MNcdNode* Node that contains the dependency content. 

     *         If the dependency content has been given as a 

     *         downloadable content, then NULL is returned.

     *         Counted, Release() must be called after use.

     * @exception Leave System wide error code.

     */

    virtual MNcdNode* DependencyNodeL() const = 0;

    /**

     * Returns the state of the dependency

     *

     * @return Dependency's state

     */

    virtual TNcdDependencyState State() const = 0;

protected:

    /**

     * The destructor of an interface is set virtual to make sure that

     * the destructors of derived classes are called appropriately when the

     * object is destroyed.

     *

     * Destructor is defined as protected to prevent direct use of 

     * delete on interface.

     *

     * 

     */

    virtual ~MNcdNodeDependencyInfo() { };

};

#endif // NCD_NODE_DEPENDENCY_INFO