/*

* Copyright (c) 2002-2006 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:  

*

*/

#ifndef C_CFCONTEXTQUERYIMPL_H

#define C_CFCONTEXTQUERYIMPL_H

#include "cfcontextquery.h"    // defs type & source lengths

class RWriteStream;

class RReadStream;

/**

* CCFContextQuery implementation.

*

* @lib CFServices.lib

* @since S60 5.0

*/

NONSHARABLE_CLASS( CCFContextQueryImpl ): public CCFContextQuery

    {

    public:

        /**

        * Two phased constructor.

        * Takes a source and type of the queried context as

        * a parameter.

        *

        * @since S60 5.0

        * @param aSource Context source.

        * @param aType Context Type.

        * @return CCFContextQuery*

        */

        IMPORT_C static CCFContextQueryImpl* NewL( const TDesC& aSource,

            const TDesC& aType );

        IMPORT_C static CCFContextQueryImpl* NewLC( const TDesC& aSource,

            const TDesC& aType );

        // Destructor

        ~CCFContextQueryImpl();

    public: // From base classes

        // @see CCFContextQuery

        void SetTypeL( const TDesC& aType );

        // @see CCFContextQuery

        const TDesC& Type() const;

        // @see CCFContextQuery

        void SetSourceL( const TDesC& aSource );

        // @see CCFContextQuery

        const TDesC& Source() const;

        // @see CCFContextQuery

        void SetSubTypeMatch( TBool aMatchSubTypes );

        // @see CCFContextQuery

        TBool SubTypeMatch() const;

    public:

        /**

        * Internalizes object.

        *

        * @since S60 5.0

        * @param aStream Stream from which to internalize.

        * @return None.

        */

        IMPORT_C void InternalizeL( RReadStream& aStream );

        /**

        * Externalizes object.

        * 

        * @since S60 5.0

        * @param aStream Stream where to externalize.

        * @return None

        */

        IMPORT_C void ExternalizeL( RWriteStream& aStream );

        /**

        * Gets object size in bytes.

        *

        * @since S60 5.0

        * @param None

        * @return TInt

        */

        IMPORT_C TInt Size() const;

        /**

        * Checks if a context source and context type matches this query.

        * 

        * @since S60 5.0

        * @param aContextType Context type to match.

        * @param aContextSource Context source to match.

        * @return ETrue if a match.

        */

        IMPORT_C TBool Matches( const TDesC& aContextType, 

            const TDesC& aContextSource ) const;

        /**

        * Checks if a particular query matches a context source,

        * context type and sub type match.

        * 

        * @since S60 5.0

        * @param aQuery Query to match with.

        * @param aContextType Context type to match with query.

        * @param aContextSource Context source to match with query.

        * @param aMatchSubTypes Match sub types flag.

        * @return ETrue if a match.

        */

        IMPORT_C static TBool MatchesQuery( const CCFContextQuery& aQuery,

			const TDesC& aContextType,

			const TDesC& aContextSource,

			TBool aMatchSubTypes );

        /**

        * Checks if tow queries are the same.

        *

        * @since S60 5.0

        * @param aQuery1 First query.

        * @param aQuery2 Second query.

        * @return ETrue if a match.

        */

        IMPORT_C static TBool IsSame( const CCFContextQuery& aQuery1,

			const CCFContextQuery& aQuery2 );

    private:

        CCFContextQueryImpl();

        void ConstructL( const TDesC& aSource, const TDesC& aType );

    private: // Data

        /** 

        * The (URI or semantic description of the) source from which the

        * context originates.

        */

        HBufC* iSource;

        /**

        * One context category description.

        * Example: <code>Environment.Temperature</code>

        */

        HBufC* iType;

        /**

        * Are subtypes are matched by this query.

        */

        TBool iMatchSubTypes;

    };

#endif