/*

* Copyright (c) 2001-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

*

*/

/**

 @file

 @released    

*/

#ifndef __MCTTOKENOBJECT_H__

#define __MCTTOKENOBJECT_H__

class MCTToken;

/** 

 * The base class for all token objects.

 *

 * Any object representing something managed via a particular token interface 

 * should be derived from this class. It provides certain common attributes that 

 * all objects must have (e.g. Label, Type, Token, Handle) and code to interact 

 * with the token's reference counting code. Token objects themselves are not 

 * reference counted, but the token will not be closed while token objects from 

 * it remain in existence. (Token objects can implement their own reference counting 

 * framework if required.) 

 *

 * @since v7.0 

 */

class MCTTokenObject 

	{

public:

	/** 

	 * Releases the MCTTokenObject object.

	 *

	 * To be called when you have finished with the object. 

	 */

	IMPORT_C void Release();

	/** 

	 * Gets the object's human-readable label.	

	 *

	 * @return	A human-readable label of the object. 

	 */

	virtual const TDesC& Label() const = 0;

	/** 

	 * Gets a reference to the associated token.

	 *

	 * @return	The associated token. 

	 */

	virtual MCTToken& Token() const = 0;

	/** 

	 * Gets the UID representing the type of the token object.

	 *

	 * The meanings of possible UIDs should be documented in the documentation for 

	 * the interface that returns them.

	 *

	 * @return	The UID representing the type of the token object. 

	 */

	virtual TUid Type() const = 0;

	/** 

	 * Gets a handle for the object.

	 *

	 * The primary purpose of the handle is to allow token objects to be 'passed' 

	 * between processes. 

	 *

	 * @see TCTTokenObjectHandle for more details. 

	 * @return	The handle of the Token Object. 

	 */

	virtual TCTTokenObjectHandle Handle() const = 0;

 protected:

	/** 

	 * Releases the object once the base-class framework work has been done.

	 * 

	 * The default implementation simply does a 'delete this', but derived classes 

	 * can substitute their own behaviour; for instance, to implement reference counting 

	 * of the token objects themselves. 

	 */

	IMPORT_C virtual void DoRelease();

	/**

	 * Constructor. This needs a token in order to increment the

	 * token's reference count. 

	 * 

	 * @param aToken	The associated token.

	 */

	IMPORT_C MCTTokenObject(MCTToken& aToken);

	/** This destructor is protected as clients should use Release() instead. 

	*/

	inline virtual ~MCTTokenObject() = 0;

	/** 

	 * Increments the token's reference count by one.  

	 * 

	 * This is neccessary to allow derived classes to implement their own 

	 * reference counting, as Release() automatically call Release() on the token. 

	 */

	IMPORT_C void AddTokenRef();

	};

/** 

 * Destructor.

 *

 * Frees all resources owned by the object, prior to its destruction. 

 */

inline MCTTokenObject::~MCTTokenObject()

	{

	}

#endif