/*

* Copyright (c) 2005-2007 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:  Policy evaluator

*

*/

#ifndef C_POLICYEVALUATOR_H

#define C_POLICYEVALUATOR_H

#include <e32base.h>

#include "aipolicyelement.h"

class CXnNodeAppIf;

namespace AiXmlUiController

{

/**

 *  @ingroup group_xmluicontroller

 * 

 *  Policy evaluator class

 *

 *  @lib AiXmlUiMain

 */

class CPolicyEvaluator : public CBase

    {

public:

    static CPolicyEvaluator* NewL();

    virtual ~CPolicyEvaluator();

    /**

     * Evaluates content policy for ui element. 

     *

     * @param aTarget target ui element

     * @param aPolicyArray array of found policies to fill

     * @leave 

     */

    void EvaluateContentPolicyL( CXnNodeAppIf& aTarget,

                                 RAiPolicyElementArray& aPolicyArray );

    /**

     * Evaluates empty content policy for ui element. 

     *

     * @param aTarget target ui element

     * @param aPolicyArray array of found policies to fill

     * @leave 

     */

    void EvaluateEmptyContentPolicyL( CXnNodeAppIf& aTarget,

                                      RAiPolicyElementArray& aPolicyArray );

    /**

     * Evaluates Visiblity policy for ui element. 

     *

     * @param aTarget target ui element

     * @param aResource resource element to publish

     * @param aPolicyArray array of found policies to fill

     * @leave 

     */

    void EvaluateVisibilityPolicyL( CXnNodeAppIf& aTarget,

                                    RAiPolicyElementArray& aPolicyArray );

    /**

     * Evaluates ContentChanged policy for ui element. 

     *

     * @param aTarget target ui element

     * @param aResource resource element to publish

     * @param aPolicyArray array of found policies to fill

     * @leave 

     */

    void EvaluateContentChangedPolicyL( CXnNodeAppIf& aTarget,

                                    RAiPolicyElementArray& aPolicyArray );

    /**

     * Evaluates resource policy for ui element. 

     *

     * @param aTarget target ui element

     * @param aResource resource element to publish

     * @param aPolicyArray array of found policies to fill

     * @leave 

     */

    void EvaluateResourcePolicyL( CXnNodeAppIf& aTarget,

                                  CXnNodeAppIf& aResource,

                                  RAiPolicyElementArray& aPolicyArray );

private:

    CPolicyEvaluator();

    void ConstructL();

    void EvaluatePolicyL( CXnNodeAppIf& aTarget,

                          RAiPolicyElementArray& aPolicyArray,

                          const TDesC8& aPolicyClass );

    TBool MatchCondition( const TDesC8& aId,

                          const TDesC8& aCondition );

    TBool MatchVisibilityConditionL( const TDesC8& aCondition,

                                    CXnNodeAppIf& aProperty,

                                    RAiPolicyElementArray& aPolicyArray );

    };

} // namespace AiXmlUiController

#endif // C_POLICYEVALUATOR_H