// Copyright (c) 1997-2009 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:

//

#if defined (_MSC_VER) && (_MSC_VER >= 1000)

#pragma once

#endif

#ifndef _INC_RESOLVER_3A1D097B0305_INCLUDED

#define _INC_RESOLVER_3A1D097B0305_INCLUDED

#include <ecom/resolver.h>

#include "RegistryData.h"

class TEComResolverParams;

/**

	@internalComponent

	@since 7.0

	Controls the identification, (resolution), of which implementation 

	will be used to satisfy an interface implementation instantiation.

 */

class CDefaultResolver : public CResolver

{

public:

/**

	@fn				NewL(CRegistryData& aRegistry)

	Intended Usage	: Standardized safe construction which leaves nothing 

					on the cleanup stack.	

	Error Condition	: Cannot fully construct because of memory limitations.	

	@leave  		KErrNoMemory

	@since			7.0

	@return			A pointer to the new class

	@post			CDefaultResolver is fully constructed, 

					and initialized.

 */

	static CDefaultResolver* NewL(MPublicRegistry& aRegistry);

/**

	@fn				~CDefaultResolver()

	Intended Usage	: Standard default d'tor	

	Error Condition	: None	

	@since			7.0

 */

	~CDefaultResolver();

/**

	@fn				IdentifyImplementationL(TUid aInterfaceUid, 

											const TEComResolverParams& aAdditionalParameters) const

	Intended Usage	:	Request that the resolver identify the most appropriate 

						interface implementation.

	Error Condition	:	

	@since			7.0

	@param			aInterfaceUid The interface for which implementations are requested

	@param			aAdditionalParameters Data to be used to refine the search further

	@return			The Uid of the best fit interface implementation - KNullUid if no match is found

	@pre 			Object is fully constructed and initialized

	@post			Registry contents are not modified but registry keys may be updated

 */

	TUid IdentifyImplementationL(TUid aInterfaceUid, const TEComResolverParams& aAdditionalParameters)const ;

/**

	@fn				ListAllL(TUid aInterfaceUid, const TEComResolverParams& aAdditionalParameters) const

	Intended Usage	:	List all the implementations which satisfy the specified interface.

	Error Condition	:	

	@since			7.0

	@param			aInterfaceUid The interface for which implementations are requested

	@param			aAdditionalParameters Data to be used to refine the search further

	@return			Pointer to an array of suitable implementations. Ownership of this array

	is passed to the calling function.

	@pre 			Object is fully constructed and initialized

	@post			Registry contents are not modified but registry keys may be updated

 */

	RImplInfoArray* ListAllL(TUid aInterfaceUid, 

							 const TEComResolverParams& aAdditionalParameters)const;

protected:

/**

	@internalComponent

	@fn				CDefaultResolver(CRegistryData& aRegistry)

	Intended Usage	: Standardized default c'tor	

	Error Condition	: None	

	@since			7.0

	@post			CDefaultResolver is fully constructed

 */

	explicit CDefaultResolver(MPublicRegistry& aRegistry);

/**

	@fn				Resolve(const RImplInfoArray& aImplementationsInfo, 

							const TEComResolverParams& aAdditionalParameters) const

	Intended Usage	:	Called by IdentifyImplementationL to select an appropriate 

					implementation from a list of possibles

	@since			7.0

	@param			aImplementationsInfo Information on the potential implementations

	@param			aAdditionalParameters The data to match against to detemine the 

					implementation

	@return			The Uid of the selected implementation - KNullUid if no match is found

	@pre 			This object is fully constructed

 */

	TUid Resolve(const RImplInfoArray& aImplementationsInfo, 

				 const TEComResolverParams& aAdditionalParameters) const;

private:

/**

	@fn				Match(const TDesC8& aImplementationType, 

						  const TDesC8& aMatchType, 

						  TBool aUseWildcards) const

	Intended Usage	:	Searches for a match of a data type on an implementation type.

	Match returns ETrue if aMatchType is found within aImplementationType according to 

	the following rules:

	1) aImplementationType is treated as a series of descriptors separated by double 

	bars (||). ETrue is returned if aMatchType matches exactly any of the short 

	descriptors.  If no double bar is present then aImplementationType is treated as a

	single descriptor.

	2) If aUseWildcards == ETrue then a '?' in aMatchType will be matched to any single

	character and '*' will be matched to any series of characters.

	@leave  		KErrNoMemory

	@since			7.0

	@param			aImplementationType The implementation data type to search for a match

	@param			aMatchType The data to search for

	@param			aUseWildcards ETrue if wildcard matching should be allowed

	@return			ETrue if a match was found, EFalse otherwise

	@pre 			This object is fully constructed

 */

	TBool Match(const TDesC8& aImplementationType, 

				const TDesC8& aMatchType, 

				TBool aUseWildcards) const;

protected:

	/** Required for test code to have access to internal state */

	friend class TDefaultResolver_StateAccessor;

};

#endif /* _INC_RESOLVER_3A1D097B0305_INCLUDED */