ncdengine/inc/ncdqueryitem.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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/*
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* Copyright (c) 2006 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:  
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*
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*/
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#ifndef M_NCD_QUERY_ITEM_H
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#define M_NCD_QUERY_ITEM_H
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#include <e32cmn.h>
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#include "catalogsbase.h"
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#include "ncdinterfaceids.h"
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/**
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 *  Describes a query item.
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 *
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 *  A common interface for all query items. A query item defines
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 *  one element of a whole query e.g. credit card number in a purchase 
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 *  information query.
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 *
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 *  All query items that are not optional must be answered/filled before 
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 *  completing a query.
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 *
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 *  @see MNcdQuery
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 */
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class MNcdQueryItem : public virtual MCatalogsBase
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    {
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public:
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    /**
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     * Unique identifier for the interface, required for all MCatalogsBase interfaces.
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     *
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     * 
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     */
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    enum { KInterfaceUid = ENcdQueryItemUid };
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    /**
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     * Query item semantics
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     */
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    enum TSemantics
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        {
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        /** No specific semantics specified */
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        ESemanticsNone,
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        /** Unknown/unsupported semantics specified */
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        ESemanticsUnknown,
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        /** MSISDN (phone number) */
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        ESemanticsMsisdn,
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        /** Email address */
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        ESemanticsEmailAddress,
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        /** Credit card number */
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        ESemanticsCreditCardNumber,
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        /** Credit card expiration year */
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        ESemanticsCreditCardExpirationYear,
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        /** Credit card expiration month */
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        ESemanticsCreditCardExpirationMonth,
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        /** Credit card owner */
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        ESemanticsCreditCardOwner,
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        /** Credit card verification code */
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        ESemanticsCreditCardVerificationCode,
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        /** Credit card type */
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        ESemanticsCreditCardType,
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        /** Street address */
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        ESemanticsAddressStreet,
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        /** ZIP code */
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        ESemanticsAddressZipCode,
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        /** City */
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        ESemanticsAddressCity,
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        /** Country */
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        ESemanticsAddressCountry,
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        /** User name */
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        ESemanticsUserName,
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        /** Password */
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        ESemanticsPassword,
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        /** PIN code */
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        ESemanticsPinCode,
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        /** IMEI */
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        ESemanticsImei
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        };
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    /**
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     * Type of the query.
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     *
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     * 
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     * @return Interface id of the operation.
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     */
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    virtual TNcdInterfaceId Type() const = 0;
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    /**
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     * Semantics of the query item.
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     *
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     * This can be used to act differently for semantically
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     * different query items that have the same basic type
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     * (as indicated by Type()).
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     *
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     * 
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     * @return Semantics for the item.
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     */
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    virtual TSemantics Semantics() const = 0;
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    /**
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     * Getter for query item label. Labels are used to identify the
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     * what the query item is e.g. "username" or "credit card owner".
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     * Typically displayed next to the actual item.
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     *
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     * 
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     * @return Label text. KNullDesC() if no label available.
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     */
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    virtual const TDesC& Label() const = 0;
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    /**
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     * Getter for query item message. Optionally displayed in a question
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     * dialog body close to the query item. Can offer information/advice on what
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     * the user should input e.g. "Please enter the cardholder's name".
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     *
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     * 
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     * @return Message text. KNullDesC() if no message available.
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     */
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    virtual const TDesC& Message() const = 0;
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    /**
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     * Getter for query item description. Additional longer description text
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     * about the query element, intended for context help
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     *
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     * 
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     * @return Message text. KNullDesC() if no description available.
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     */
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    virtual const TDesC& Description() const = 0;
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    /**
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     * Checks whether this query item is optional i.e. does not need
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     * to be answered/filled before the query is accepted.
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     *
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     * @return ETrue if the item is optional, EFalse if it is mandatory.
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     */
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    virtual TBool IsOptional() const = 0;
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protected:
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    /**
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    * Destructor.
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    *
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    * @see MCatalogsBase::~MCatalogsBase
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    */
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    virtual ~MNcdQueryItem() {}
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    };
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#endif //  M_NCD_QUERY_ITEM_H