ncdengine/inc/ncdsubscription.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:   Definition of MNcdSubscription interface
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*
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*/
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#ifndef M_NCDSUBSCRIPTION_H
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#define M_NCDSUBSCRIPTION_H
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#include "catalogsbase.h"
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#include "ncdinterfaceids.h"
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class MNcdSubscriptionOperation;
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class MNcdSubscriptionOperationObserver;
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class TTime;
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class MNcdNode;
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/**
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 *  Subscription interface.
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 *
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 *  This interface describes a subscription and provides methods for
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 *  subscription management.
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 *
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 *  
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 */
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class MNcdSubscription : 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 = ENcdSubscriptionUid };
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    /**
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     * Type of the subscription renewal method.
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     *
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     */
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    enum TType
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        {
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        /** Requires an explicit renewal after expiration. */
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        EPeriodic,
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        /** Renewed automatically on server side after expiration. */
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        EAutomaticContinous
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        };
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    /**
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     * Status of the subscription.
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     *
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     * 
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     */
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    enum TStatus
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        {
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        /**
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         * Subscription has been purchased and is still active
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         * (validity time/credits/downloads left).
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         */
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        ESubscriptionActive,
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        /**
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         * Subscription has been purchased, but has expired
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         * (out of validity time/credits/downloads).
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         */
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        ESubscriptionExpired
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        };
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    /**
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     * Name getter.
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     *
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     * 
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     * @return Name of the subscription.
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     */ 
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    virtual const TDesC& Name() const = 0;
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    /**
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     * Icon getter.
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     *
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     * 
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     * @return Icon data. Ownership is transferred. Empty descriptor
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     *         returned if icon data is not set.
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     * @exception Leave with KNcdErrorObsolete if this subscription
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     *            is obsolete. Otherwise leave with System wide error code.
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     */
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    virtual HBufC8* IconL() const = 0;
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    /**
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     * Returns the current status for the subscription.
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     *
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     * 
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     * @return Current status of the subscription.
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     */
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    virtual TStatus SubscriptionStatus() const = 0;
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    /**
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     * Checks whether this subscription is obsolete or not.
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     * Subscription becomes obsolete if it is removed while
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     * user still has reference to it. Removal can be done for
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     * example because the subscription was removed from the
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     * server.
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     * Obsolete subscription should not be used and valid subscription
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     * instances should be retrieved by using SubscriptionsL
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     * method from MNcdSubscriptionManager interface.
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     *
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     * 
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     * @return ETrue if this purchase option is obsolete.
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     */
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    virtual TBool IsObsolete() const = 0;
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    /**
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     * Returns whether the subscription has been unsubscribed or not.
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     *
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     * 
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     * @return ETrue, if subscription has been unsubscribed. EFalse, if the subcription
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     *  has not been unsubscribed.
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     */
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    virtual TBool Unsubscribed() const = 0;
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    /**
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     * Unsubscribe a currently valid subscription. 
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     *
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     * 
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     * @param aObserver Operation observer interface.
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     * @return Subscription operation object. Counted, Release() must be called after use.
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     * @exception Leave with KNcdErrorObsolete if this subscription
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     *            is obsolete. Otherwise leave with System wide error code.
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     */
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    virtual MNcdSubscriptionOperation* UnsubscribeL( 
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        MNcdSubscriptionOperationObserver& aObserver ) = 0;
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    /**
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     * Get type of the subscription.
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     *
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     * 
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     * @return Subscription type.
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     */
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    virtual TType SubscriptionType() const = 0;
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    /**
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     * Get subscription validity time information.
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     *
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     * 
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     * @param aValidUntil Set to time when the subscription expires, if
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     *  ETrue is returned, otherwise not used. Time given is in local time.
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     * @return ETrue, if validity time is set. EFalse, if the subcription
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     *  has no validity time limit set (stays valid indefinitely).
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     */
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    virtual TBool ValidityTime( TTime& aValidUntil ) const = 0;
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    /**
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     * Get subscription credit limit information.
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     *
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     * 
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     * @param aCreditsLeft If ETrue is returned, set to current number of
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     *  credits left in the subscription.
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     * @param aTotalCredits If ETrue is returned, set to total number of
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     *  credits the subscription originally had after purchase.
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     * @return ETrue if subscription has a credit limit, EFalse otherwise.
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     */
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    virtual TBool CreditLimit( TReal& aCreditsLeft, TReal& aTotalCredits ) const = 0;
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    /**
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     * Get subscription download limit information.
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     *
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     * 
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     * @param aDownloadsLeft If ETrue is returned, set to current number of
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     *  downloads left in the subscription.
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     * @param aTotalDownloads If ETrue is returned, set to total number of
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     *  downloads the subscription originally had after purchase.
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     * @return ETrue if subscription has a download limit, EFalse otherwise.
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     */
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    virtual TBool DownloadLimit( TInt& aDownloadsLeft, TInt& aTotalDownloads) const = 0;
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    /**
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     * Returns the node that has the purchase option which was used
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     * to buy this subscription.
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     *
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     * @return Pointer to the node that has the purchase option to buy
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     *         this subscription. Note that the node may be in an 
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     *         uninitialized state, or in an initialized state, depending
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     *         on whether the node has previously been known to the engine.
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     *         Counted, Release() must be called after use.
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     *
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     * @exception Leave with KNcdErrorObsolete if this subscription
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     *            is obsolete. Otherwise leave with System wide error code.
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     */
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    virtual MNcdNode* OriginNodeL() const = 0;
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    /**
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     * Returns an id that identifies the purchaseoption that was used to buy
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     * this subscription. Node that has the purchase option identified by
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     * the id returned from this function can be queried by using method
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     * OriginNodeL() of this class.
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     *
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     * @return Id that identifies the purchaseoption that was used
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     *         to buy this subscription. Node where from this purchase
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     *         option is found can be queried by using method
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     *         OriginNodeL() of this class. Returns KNullDesC on error
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     *         situations.
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     */
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    virtual const TDesC& OriginPurchaseOptionId() const = 0;
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protected: // Destruction
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    /**
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     * Destructor
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     * 
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     * Protected so that the implementing object cannot be deleted through
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     * this interface by using delete. The destructor of an interface should
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     * be set virtual to make sure that the destructors of derived classes
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     * will be called when object is destroyed.
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     */
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    virtual ~MNcdSubscription() {}
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    };
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#endif // M_NCDSUBSCRIPTION_H