idlehomescreen/xmluicontroller/inc/policyevaluator.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 09 Jun 2010 09:29:04 +0300
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/*
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* Copyright (c) 2005-2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Policy evaluator
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*
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*/
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#ifndef C_POLICYEVALUATOR_H
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#define C_POLICYEVALUATOR_H
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#include <e32base.h>
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#include "aipolicyelement.h"
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class CXnNodeAppIf;
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namespace AiXmlUiController
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{
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/**
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 *  @ingroup group_xmluicontroller
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 * 
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 *  Policy evaluator class
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 *
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 *  @lib AiXmlUiMain
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 */
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class CPolicyEvaluator : public CBase
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    {
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public:
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    static CPolicyEvaluator* NewL();
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    virtual ~CPolicyEvaluator();
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    /**
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     * Evaluates content policy for ui element. 
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     *
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     * @param aTarget target ui element
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     * @param aPolicyArray array of found policies to fill
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     * @leave 
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     */
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    void EvaluateContentPolicyL( CXnNodeAppIf& aTarget,
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                                 RAiPolicyElementArray& aPolicyArray );
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    /**
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     * Evaluates empty content policy for ui element. 
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     *
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     * @param aTarget target ui element
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     * @param aPolicyArray array of found policies to fill
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     * @leave 
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     */
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    void EvaluateEmptyContentPolicyL( CXnNodeAppIf& aTarget,
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                                      RAiPolicyElementArray& aPolicyArray );
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    /**
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     * Evaluates Visiblity policy for ui element. 
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     *
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     * @param aTarget target ui element
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     * @param aResource resource element to publish
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     * @param aPolicyArray array of found policies to fill
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     * @leave 
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     */
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    void EvaluateVisibilityPolicyL( CXnNodeAppIf& aTarget,
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                                    RAiPolicyElementArray& aPolicyArray );
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    /**
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     * Evaluates ContentChanged policy for ui element. 
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     *
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     * @param aTarget target ui element
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     * @param aResource resource element to publish
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     * @param aPolicyArray array of found policies to fill
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     * @leave 
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     */
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    void EvaluateContentChangedPolicyL( CXnNodeAppIf& aTarget,
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                                    RAiPolicyElementArray& aPolicyArray );
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    /**
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     * Evaluates resource policy for ui element. 
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     *
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     * @param aTarget target ui element
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     * @param aResource resource element to publish
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     * @param aPolicyArray array of found policies to fill
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     * @leave 
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     */
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    void EvaluateResourcePolicyL( CXnNodeAppIf& aTarget,
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                                  CXnNodeAppIf& aResource,
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                                  RAiPolicyElementArray& aPolicyArray );
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private:
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    CPolicyEvaluator();
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    void ConstructL();
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    void EvaluatePolicyL( CXnNodeAppIf& aTarget,
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                          RAiPolicyElementArray& aPolicyArray,
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                          const TDesC8& aPolicyClass );
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    TBool MatchCondition( const TDesC8& aId,
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                          const TDesC8& aCondition );
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    TBool MatchVisibilityConditionL( const TDesC8& aCondition,
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                                    CXnNodeAppIf& aProperty,
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                                    RAiPolicyElementArray& aPolicyArray );
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    };
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} // namespace AiXmlUiController
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#endif // C_POLICYEVALUATOR_H