/*

* Copyright (c) 2005-2006 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:  CPosLmCompositeCriteria class

*

*/

#ifndef CPOSLMCOMPOSITECRITERIA_H

#define CPOSLMCOMPOSITECRITERIA_H

#include <e32base.h>

#include "EPos_CPosLmSearchCriteria.h"

/**

*  Class used to combine multiple search criterion.

*

*  For instance, to search for all restaurants in the area, this class can be

*  used to combine a @ref CPosLmAreaCriteria and a @ref CPosLmCategoryCriteria.

*

*  If a @ref CPosLmNearestCriteria is used and no sort preference is specified,

*  the result will be sorted by distance. If more than one

*  @ref CPosLmNearestCriteria are combined using a @ref CPosLmCompositeCriteria,

*  the sort order will be undefined unless a sort preference is specified.

*

*  Nested @ref CPosLmCompositeCriteria are not allowed.

*

*  This criterion only supports searching for landmarks, e.g. if it is passed

*  to @p CPosLandmarkSearch::StartCategorySearchL, the function will fail with

*  error code @p KErrNotSupported.

*

*  @lib eposlmsearchlib.lib

*  @since S60 3.0

*/

class CPosLmCompositeCriteria : public CPosLmSearchCriteria

    {

    public:

        /**

        *  Specifies the type of the composite criterion.

        *  ECompositionOR - is supported only when all the contained critarias are CPosLmTextCriteria. it is not supported for other criteria.

        */

        enum TCompositionType

            {

            ECompositionAND = 0,     /**< Search results must match all

                                    * contained criteria. */

            ECompositionOR = 1		/**< Search result must match one of the contained criteria

            						* ECompositionOR - is supported only when all the contained critarias are CPosLmTextCriteria. it is not supported for other criteria*/

            };

    public:

        /**

        * Two-phased constructor.

        *

        * @param[in] aType The composition type to use.

        * @returns A new instance of this class.

        */

        IMPORT_C static CPosLmCompositeCriteria* NewLC(

            TCompositionType  aType

        );

        /**

        * Destructor.

        */

        virtual ~CPosLmCompositeCriteria();

    public:

        /**

        * Returns the type of this composite criterion.

        *

        * @return The composition type. 

        */

        IMPORT_C TCompositionType CompositionType() const;

        /**

        * Set the type of this composite criterion.

        *

        * @param[in] The composition type to use. 

        */

        IMPORT_C void SetCompositionType( TCompositionType  aType );

        /**

        * Returns the number of criteria this object contains.

        *

        * @return The number of criteria this object contains.

        */

        IMPORT_C TUint NumOfArguments() const;

        /**

        * Returns a criterion argument contained in this object.

        *

        * This overload returns a const reference to the criterion argument.

        * There is another overload which returns a non-const reference.

        *

        * @param aIndex The argument to read. Must be in the interval

        *   [0, @ref NumOfArguments - 1], or this function will raise a

        *   USER-130 panic.

        * @return The requested argument.

        */

        IMPORT_C const CPosLmSearchCriteria& Argument( TUint aIndex ) const;

        /**

        * Returns a criterion argument contained in this object.

        *

        * This overload returns a non-const reference to the criterion

        * argument. There is another overload which returns a const reference.

        *

        * @param aIndex The argument to read. Must be in the interval

        *   [0, @ref NumOfArguments - 1], or this function will raise a

        *   USER-130 panic.

        * @return The requested argument.

        */

        IMPORT_C CPosLmSearchCriteria& Argument( TUint aIndex );

        /**

        * Adds a criterion to this composition.

        *

        * The composite criterion must contain at least one argument, otherwise

        * @ref CPosLandmarkSearch::StartLandmarkSearchL will fail with error

        * code @p KErrArgument.

        *

        * If this function returns without an error code, ownership of the

        * added criterion object is transferred to the composite object.

        *

        * @ref CPosLmCompositeCriteria are not supported when composition type is @ref ECompositionAND.

        * @ref Only CPosLmTextCriteria is supported in the case of @ref ECompositionOR

        *

        * Searching for landmark categories using @ref CPosLmCompositeCriteria 

        * is not supported in the case of ECompositionAND.

        *

        * @param[in] aCriteria The criterion to add to the composition.

        * @returns - @p KErrNone if successful

        *          - @p KErrNotSupported 

        *				- @p if @ref CPosLmCompositeCriteria or @ref CPosLmCatNameCriteria is specified when coposition type is ECompositionAND.

        *			 	- @p If criteria other than CPosLmTextCriteria is specified with ECompositionOR

        *          - @p otherwise a system wide error code.

        */

        IMPORT_C TInt AddArgument( CPosLmSearchCriteria* aCriteria );

        /**

        * Removes a criterion from this composition.

        *

        * Note: This function does not delete the criterion object. Instead,

        * the ownership of the object is passed to the caller.

        *

        * @param aIndex The argument to remove. Must be in the interval

        *   [0, @ref NumOfArguments - 1], or this function will raise a

        *   USER-130 panic.

        *

        * @returns The criterion object which was removed from the composition.

        */

        IMPORT_C CPosLmSearchCriteria* RemoveArgument( TUint  aIndex );

        /**

        * Removes and deletes all contained criterion objects.

        *

        * The composite criterion must contain at least one argument, otherwise

        * @ref CPosLandmarkSearch::StartLandmarkSearchL will fail with error

        * code @p KErrArgument.

        */

        IMPORT_C void ClearArguments();

    private:

        CPosLmCompositeCriteria( TCompositionType aType );

        void ConstructL();

        // Prohibit copy constructor

        CPosLmCompositeCriteria( const CPosLmCompositeCriteria& );

        // Prohibit assigment operator

        CPosLmCompositeCriteria& operator= ( const CPosLmCompositeCriteria& );

    private:

        TCompositionType                    iCompositionType;

        RPointerArray<CPosLmSearchCriteria> iArguments;

    };

#endif      // CPOSLMCOMPOSITECRITERIA_H