/*

* 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 __MCTTOKENTYPE_H__

#define __MCTTOKENTYPE_H__

#include <f32file.h>

#include <ct/rcpointerarray.h>

class CCTTokenTypeInfo;

class MCTToken;

class TCTTokenHandle;

/** 

 * A token type.

 *

 * This abstract class is instantiated using the ECom Plug-in Architecture 

 * for a particular token type. It allows a list of available tokens of that 

 * type to be obtained, and particular tokens to be opened.

 * 

 * All implementation classes are in fact a subclass of CCTTokenType; refer to 

 * its documentation for implementation details. Client access is entirely through 

 * this M class.

 * 

 * The difference betweeen a token type and a token is best explained with an 

 * example. Suppose a device has two identical WIM slots, the code to handle WIMs 

 * is one token type, which will have two tokens for the two WIMs. 

 *

 * @since v7.0 

 */

 class MCTTokenType

	{

 public:

	// Static constructor functions that use ECom to load the actual implementation.

	/** 

	 * Creates a MCTTokenType given it's CCTTokenTypeInfo

	 *

	 * The definition of this inline function is in CCTTokenType.h.  If you call

	 * this function, you need to link against ctfinder.dll as well as

	 * ctframework.dll

	 *

	 * @param aInfo	Information about the token type.

	 * @param aFs	An open file server session.

	 * @return		The new token type object. 

	 */

	inline static MCTTokenType* NewL(const CCTTokenTypeInfo& aInfo, RFs aFs);

	/** 

	 * Creates a MCTTokenType given the UID of the token type. 

	 *

	 * The definition of this inline function is in CCTTokenType.h.  If you call

	 * this function, you need to link against ctfinder.dll as well as

	 * ctframework.dll

	 *

	 * @param aUID	The UID of the token type.

	 * @param aFs	An open file server session.

	 * @return		A new token type object. 

	 */

	inline static MCTTokenType* NewL(TUid aUID, RFs aFs);

	/** 

	 * Lists all the tokens of this type.

	 *

	 * This is an asynchronous request.

	 *

	 * Tokens are defined by name, so instead of returning a CCTTokenTypeInfo object, 

	 * this function just gives a list of pointers to HBufC objects.

	 *

	 * @param aTokens	On return, a list of all the tokens.

	 * @param aStatus	The request status object; contains the result of the List() 

	 * 					request when complete. Set to KErrCancel if an outstanding request is cancelled. 

	 */

	virtual void List(RCPointerArray<HBufC>& aTokens, 

					  TRequestStatus& aStatus) = 0;

	/** 

	 * Cancels an asynchronous List() operation.

	 *

	 * The operation completes with KErrCancel. 

	 */

	virtual void CancelList() = 0;

	/** 

	 * Opens the specified token.	

	 *

	 * @param aTokenInfo	Information about the required token.

	 * @param aToken		On return, the token to be opened.

	 * @param aStatus		The request status object; contains the result of the OpenToken() 

	 * 						request when complete. Set to KErrCancel if an outstanding request is cancelled. 

	 */

	virtual void OpenToken(const TDesC& aTokenInfo, MCTToken*& aToken, 

						   TRequestStatus& aStatus) = 0;

	/** 

	 * Opens the specified token. 	

	 *

	 * @param aHandle	The handle of the token.

	 * @param aToken	On return, the token to be opened.

	 * @param aStatus	The request status object; contains the result of the OpenToken() 

	 * 					request when complete. Set to KErrCancel if an outstanding request is cancelled. 

	 */

	virtual void OpenToken(TCTTokenHandle aHandle, MCTToken*& aToken, 

						   TRequestStatus& aStatus) = 0;

	/** 

	 * Cancels an asynchronous OpenToken() operation.

	 *

	 * The operation completes with KErrCancel. 

	 */

	virtual void CancelOpenToken() = 0;

	/** 

	 * Releases the token type object.

	 *

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

	 *

	 * The API does not allow the destructor to be directly called as this object 

	 * could remain in existence for longer to hold onto the ECom handle on the DLL; 

	 * for instance, it may not be deleted until all tokens and interfaces have also 

	 * been released. 

	 */

	virtual void Release() = 0;

	/** 

	 * Gets the UID of the token type.

	 *

	 * This function is implemented by CCTTokenType, so token type implementers need 

	 * not implement it.

	 *

	 * @return	The UID of the token type. 

	 */

	virtual TUid Type() const = 0;

	/** 

	 * Gets the label of the token type.

	 *

	 * This function is implemented by CCTTokenType, so token type implementers need 

	 * not implement it.

	 *

	 * @return	The label to the token type. 

	 */

	virtual const TDesC& Label() const = 0;

	};

#endif //__MCTTOKENTYPE_H__