/*

* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* which accompanies this distribution, and is available

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:  Interface for quering system version information.

*

*/

#ifndef VERSION_INFO_H

#define VERSION_INFO_H

//  INCLUDES

#include <e32std.h>

// FORWARD DECLARATIONS

class RFs;

// CLASS DECLARATION

/**

* Class holds system version information. Version Info API provides 

* an interface for quering system version information.

*

* Usage:

*  

* Get platform version information:

* @code

* // iFs contains open file server session

*

* VersionInfo::TPlatformVersion platformVersion;

* // Select the overload of VersionInfo::GetVersion() that suits best for 

* // the current client.

* User::LeaveIfError( VersionInfo::GetVersion( platformVersion, iFs ) );

*

* // Now platformVersion contains platform version information.

*

* @endcode

*

* @lib platformver.lib

* @since S60 3.2

*/

NONSHARABLE_CLASS(VersionInfo)

    {

public:

    /**

    * Class TVersionBase is a base class for all version information data.

    * @since S60 3.2

    */

    class TVersionBase

        {

    friend class VersionInfo;

    protected:

        /**

        * Constructor for subclasses

        * @since S60 3.2

        * @param aType Sets type of version info specified by TVersionType

        */

        inline TVersionBase( TInt aType );

    private:

        /**

        * C++ default constructor.

        */

        TVersionBase();

    private:

        /**  Contains type of version info specified by TVersionType */

        TInt iType;

        };

    /**

    * Class TPlatformVersion stores platform version information.

    * The class is used as parameter in GetVersionInfo() methods.

    * @since S60 3.2

    */

    class TPlatformVersion : public TVersionBase

        {

    public:

        /**

         * C++ default constructor.

        */

        inline TPlatformVersion();

    public:

        /**  Contains the major version. For example 3 if S60 3.2 */

        TUint16 iMajorVersion;

        /**  Contains the minor version. For example 2 if S60 3.2 */

        TUint16 iMinorVersion;

        };

    /**

    * This method gets the version information.

    *

    * @since S60 3.2

    * @param aVersion Stores the version information

    * @return System wide error code

    *

    * @see TVersionBase

    */

    IMPORT_C static TInt GetVersion( TVersionBase& aVersion );

    /**

    * This method gets the version information. Given file server 

    * session avoids the overhead of new file server connection. 

    *

    * @since S60 3.2

    * @param aVersion Stores the version information

    * @param aFs An opened file server session

    * @return System wide error code

    *

    * @see TVersionBase

    */

    IMPORT_C static TInt GetVersion( TVersionBase& aVersion, RFs& aFs );

private:

    /**

     * C++ default constructor.

     */

    VersionInfo();

    /** Used internally to detect type of version info */

    enum TVersionType

        {

        EPlatformVersion = 0

        };

    };

#include "versioninfo.inl"

#endif // VERSION_INFO_H

// End of File