pushmtm/Plugins/PushContentHandler/CSLContentHandler.h
author Kiiskinen Klaus (Nokia-D-MSW/Tampere) <klaus.kiiskinen@nokia.com>
Mon, 30 Mar 2009 12:49:49 +0300
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/*
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* Copyright (c) 2002 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 the License "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:  Declaration of CSLContentHandler.
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*
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*/
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#ifndef __CSLCONTENTHANDLER_H__
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#define __CSLCONTENTHANDLER_H__
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// INCLUDE FILES
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#include "CPushContentHandlerBase.h"
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#include "PushMtmDef.hrh"
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#include "PushContentHandlerDef.hrh"
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#include <E32Base.h>
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#include <bldvariant.hrh>
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#include <nw_dom_attribute.h>
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// CONSTANTS
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const TUid KUidPushSLContentHandler	= { EUidPushSLContentHandler };
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_LIT( KSLContentHandlerData, "text/vnd.wap.sl||application/vnd.wap.slc" );
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// FORWARD DECLARATIONS
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class CSLPushMsgEntry;
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class CPushMtmAutoFetchOperation;
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// CLASS DECLARATION
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/** 
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* CSLContentHandler Handles Service Loading Content  
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*
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* This handler takes ownership of the SL message and processes it
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* according to the Reception rules 
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* [WAP Service Loading version 31-July-2001]
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* and either stores the message or deletes it.
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* Also S60 specific requirements are applied.
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*
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* NB. If __SERIES60_PUSH_SL is not defined, then all SL push messages are 
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*     discarded!
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*/
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class CSLContentHandler : public CPushContentHandlerBase
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	{
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    public: // Constructors and destructor
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        /**
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        * Two-phased constructor. Leaves on failure.
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        * @return The constructed object.
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        */
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	    static CSLContentHandler* NewL();
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        /**
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        * D'tor.
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        */
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	    virtual ~CSLContentHandler();
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    private: // Constructors
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        /**
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        * Constructor.
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        */
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	    CSLContentHandler();
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        /**
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        * Symbian OS constructor.
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        */
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	    void ConstructL();
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    private: // New functions
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        /**
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        * Do Garbage Collection synchronously when a new message arrives.
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        * @return None.
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        */
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	    void  CollectGarbageL();
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#ifdef __SERIES60_PUSH_SL
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        /**
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        * Parse the Push SL message using XML parser.
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        * If Push Message is an SLC then convert it first to text using 
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        * CWbxmlConverterUtil class.
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        * @return None.
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        */
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	    void ParsePushMsgL();
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        /**
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        * Parse an attribute of the sl element.
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        * @param aAttrHandle The attribute to be parsed.
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        * @return None.
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        */
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	    void  ParseSlAttributeL( NW_DOM_AttributeHandle_t& aAttrHandle );
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        /**
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        * Convert the action string to a representative numeric value to 
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        * facilitate storing the message.
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        * @param aActionString The attribute value indicating the action level 
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        *        eg 'execute-high'
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        * @return TUint: a value representing the action type.
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        */
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	    TUint ConvertActionString( const TDesC8& aActionString ) const;
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        /**
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        * Set SL entry fields prior to storing message.
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        * @param aSlPushMsgEntry Entry represents message format to use when 
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        *        storing it.
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        * @return None.
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        */
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	    void SetSlPushMsgEntryFieldsL( CSLPushMsgEntry& aSlPushMsgEntry ) const;
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        /**
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        * Check if the message has to be discarded due to empty Href or 
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        * there is a message with higher acton value.
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        * @return None.
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        */
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	    void ProcessingPushMsgEntryL();
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        /**
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        * Handle Service invocation: decide what to do next according to 
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        * action value and push settings.
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        * @return Next state.
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        */
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	    TInt HandleServiceInvocationL() const;
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        /**
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        * Download the indicated content.
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        * In case of execute-high use the Browser to download the service.
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        * In case of cache use the fetch operation to download the service 
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        * silently.
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        * @return None.
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        */
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	    void FetchPushMsgEntryL();
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        /**
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        * Start the Browser and instruct it to download the content 
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        * indicated by the Sl's URI.
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        * @return None.
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        */
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	    void StartBrowserL();
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        /**
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        * Check the result of the SL-cache downloading. If it fails, save the 
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        * message. If it succeeds, discard the message.
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        * @return None.
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        */
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	    void FetchCompletedL();
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        /**
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        * Apply reception rules and save the push message. 
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        * If a message already exists with the same URL, 
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        * it is saved only if it has a higher action value.
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        * @return None.
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        */
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	    void SavePushMsgEntryL();
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        /**
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        * Store the new message to Messaging.
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        * @param aMatchingEntryId ID of the matching SI entry.
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        * @return None.
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        */
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	    void StoreSLMessageL( TMsvId aMatchingEntryId );
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	    // Attribute flags
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        /**
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        * Flag whether message has an action attribute
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        * @param aAction boolean to set flag to - 
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        *                ETrue for action attrib present
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        *                EFalse for no action attrib.
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        */ 
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	    inline void SetActionFlag( TBool aAction );
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        /**
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        * Check status of action flag to see if message has an action 
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        * attribute.
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        * @return TBool ETrue - action attribute present in message
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        *               EFalse - no action attribute.
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        */
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	    inline TBool ActionFlag() const;
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        /**
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        * Flag whether message has a Href attribute
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        * @param aHref boolean to set flag to - 
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        *              ETrue for Href attrib present
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        *              EFalse for no href attrib
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        */ 
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	    inline void SetHrefFlag( TBool aHref );
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        /**
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        * Check status of href flag to see if message has an href attribute.
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        * @return TBool
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        *         ETrue - href attribute present in message
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        *         EFalse - no href attribute
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        */
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	    inline TBool HrefFlag() const;
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#endif // __SERIES60_PUSH_SL
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    private: // Methods from CPushHandlerBase
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        /**
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        * HandleMessage Async. Version. Takes ownership of Push Message and 
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        * sets self active to continue processing message.
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        * @param aPushMsg CPushMessage to process.
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        * @param aStatus Request status variable for use in asynchronous 
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        *        operations.
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        * @return None.
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        */
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	    void HandleMessageL(CPushMessage* aPushMsg, TRequestStatus& aStatus);
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        /**
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        * HandleMessage Sync. Version. Takes ownership of Push Message and 
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        * sets self active to continue processing message.
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        * Initial State: Set data members then go to the next state 
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        * @param aPushMsg CPushMessage to process.
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        */
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	    void HandleMessageL(CPushMessage* aPushMsg);
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        /** 
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        * Same functionality as DoCancel()
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        */
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	    void CancelHandleMessage();
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        /**
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        * Reserved function.
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        */
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	    void CPushHandlerBase_Reserved1();
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        /**
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        * Reserved function.
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        */
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	    void CPushHandlerBase_Reserved2();
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    private: // Methods from CActive
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        /**
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        * Terminates any activity.
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        * @return None.
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        */
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	    void DoCancel();
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        /**
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        * Step through the various representative states for handling a 
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        * message.
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        * @return None.
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        */
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	    void RunL();
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        /**
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        * This is invoked when RunL Leaves with an error so clean up and 
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        * return.
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        * @return Error code to scheduler.
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        */
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	    TInt RunError( TInt aError );
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    private: // Data
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	    enum
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            {
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            EAction = 0x01, 
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            EHref = 0x02
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            };
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	    enum TState                 ///< States of this state machine.
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            {
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            EGarbageCollecting, 
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            EFilteringAndParsing,
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            EProcessing, 
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            EFetching, 
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            EFetchCompleted, 
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            ESavePushMsgEntry, 
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            EDone
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            };
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        TMsvId          iSavedMsgId; ///< ID of the saved message.
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        TUint32         iAttributes; ///< Attribute indication (set or not).
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	    TInt            iPushMsgAction; ///< SL action.
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	    HBufC*          iHrefBuf; ///< Href attribute. Has.
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        /// Asynchronous fetch operation that downloads the SL-cache. Owned.
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        CPushMtmAutoFetchOperation* iFetchOp;
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        NW_Uint32       iCharEncoding; ///< Char encoding of the current msg.
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        TBool           iSaveAsRead; ///< Mark the message 'read' after saving.
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    };
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#include "CSLContentHandler.inl"
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#endif	// __CSLCONTENTHANDLER_H__
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