/*

* Copyright (c) 2007-2008 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:  SUPL Settings class

*

*/

#ifndef __EPOS_CSUPLSETTINGS_H__

#define __EPOS_CSUPLSETTINGS_H__

//  INCLUDES

#include <e32base.h>

// FORWARD DECLARATIONS

class CSuplSettingsEngine;

class MSuplSettingsObserver;

class MSuplSessionObserver;

class CSuplSettingsNotifier;

class CSuplSessionNotifier;

class CServerParams;

class CTriggerParams;

// CONSTANTS

// CLASS DECLARATION

/**

*  This class is used for accessing SUPL settings. The SUPL settings 

*  contains information such about server properties which includes following:

*

*  Server address in string format.  This is an HSLP address used for SUPL connection.

*  Protocol version in mmnn format where mm indicates minor version nn is major version

*  The Internet Access Point Name refers to the access point which is used to access the HSLP over the internet.  

*  This can have maximum size of 100 characters.

*  Manufacturer name of server indicates the server manufacturer.

*  Time stamp when last used. 

*  Time stamp when last tried. 

*  Network info when the server was last used 

*  Network info when the server was last used sucessfully

*  Information on whether server supports emergency support or not

*  Information on whether server supports TLS or not

*  Information on whether server supports PSK-TLS or not

*  Information on whether server enabled or not

*  Information on whether this server entry needs to be deleted when SIM changes 

*  Information on whether server can be used in the home network or not 

*  Information on whether this server entry can be edited or not 

*  SUPL Usage indicates whether user should be notified before using SUPL.

*  Fallback indicates whether fallback is allowed or not if SUPL session fails with default server.

*

*  From the abover properties, only following fieds can be changed by SUPL settings client:

*  - SLP address

*  - IAP / destination.

*  - SLP enabled / disabled.

*  - Remove SLP, when SIM change ( yes / no ).

*  - Usage in home network ( yes / no ).

*  - Editable ( yes / no).

*

*  This is part of @lib epos_suplsettings.lib

*  @since S60 5.1 

*/

class CSuplSettings : public CBase

    {

    public:  

        /**

         * Enumeration to indicate SUPL usage.  This is used as parameter for 

         * @ref SetSuplUsage() method. Client has to select one of the values from

	     * this enumeration when changing SUPL usage.  For example, if client is 

         * changing SUPL usage to "always ask", it should select ESuplUsageAlwaysAsk. 

         * If SUPL usage is set to ESuplUsageDisabled,

         * SUPL cannot be used. 

         *

         * Client can get SUPL usage using @ref GetSuplUsage() method.

         *

         * @since S60 3.2

         */

        enum TSuplSettingsUsage

            {

            /** Indicates that user should be asked always before SUPL usage */ 

            ESuplUsageAlwaysAsk = 0, 

            /** Indicates that SUPL can be used without asking user */ 

            ESuplUsageAutomatic, 

            /** Indicates that SUPL can be used without asking user in the home network and 

            * user should be notified in the visiting network */ 

            ESuplUsageHomeAutomatic, 

            /** Indicates that SUPL usage is disabled */ 

            ESuplUsageDisabled 

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

        *

        * @since S60 3.1

        * @returns A new instance of this class.

        */

        IMPORT_C static CSuplSettings* NewL();

        * Two-phased constructor.

        *

        * @since S60 5.1 

        * @returns A new instance of this class.

        */

        IMPORT_C static CSuplSettings* NewLC();

        * Destructor.

        *

        * @since S60 3.1

        *

        */

        IMPORT_C ~CSuplSettings();

    protected:

        * C++ default constructor.

        *

        * @since S60 3.1

        *

        */

        CSuplSettings();

        * By default EPOC constructor is private.

        *

        * @since S60 3.1

        *

        */

        void ConstructL();

    public: // New functions

        * This method is used to start listening for SUPL setting changes. To

        * listen for changes, the client must implement the

        * @ref MSuplSettingsObserver interface.  Client must allocated memory 

        * for the observer.

        *

        * Listening can be stopped by invoking @ref RemoveObserver().

        *

        * @since S60 3.1

        *

        *

        * @param [IN] aObserver The observing object.

	    * @return one of the following values

	    * 	- KErrNone if setting observer is successful

	    * 	- KErrAlreadyExists if observer is already set 

	    *  

        */

        IMPORT_C TInt SetObserverL(

               MSuplSettingsObserver& aObserver

        );

        /**

         * This method is used to stop listening for SUPL setting changes.  After removing observer,

         * client has to free the memory allocated for the observer.  If this method is invoked without

         * setting observer using @ref SetObserverL() method, the request is silently ignored.

         *

         * @since S60 3.1

         *

         */

        IMPORT_C void RemoveObserver();

        * This method is used to start listening for SUPL session changes. To

        * listen for changes, the client must implement the

        * @ref MSuplSessionObserver interface.  Client must allocated memory 

        * for the observer.

        *

        * Listening can be stopped by invoking @ref RemoveSessionObserver().

        *

        * @since 

        *

        *

        * @param [IN] aObserver The observing object.

	    * @return one of the following values

	    * 	- KErrNone if setting observer is successful

	    * 	- KErrAlreadyExists if observer is already set 

	    *  

        */

        IMPORT_C TInt SetSessionObserverL(

               MSuplSessionObserver& aObserver

        );

        /**

         * This method is used to stop listening for SUPL session changes.  After removing observer,

         * client has to free the memory allocated for the observer.  If this method is invoked without

         * setting observer using @ref SetSessionObserverL() method, the request is silently ignored.

         *

         * @since 

         *

         */

        IMPORT_C void RemoveSessionObserver(); 

        /**

         * This method is invoked to initialize SUPL settings object.  This is 

         * an asynchronous call and client can cancel this request by invoking 

         * @ref CancelInitialize().  

         * During initialization, current IMSI value is obtained from

	     * the system. Client should invoke this method to re-read the IMSI if the client detects 

         * an IMSI change.

         *

         * Note that if @ref Initialize() method is invoked after started listening to 

         * SUPL settings changes by invoking @ref SetObserverL(), listening is not stopped.

         *

         * @since S60 3.1

         *

	     * @param [OUT] aStatus To return result code.  It will hold one of the following values

         * after completion:

	     * 	- KErrNone if intialization is successful

         * 	- KErrGeneral if initialization has failed (initialization can fail if SIM card is not present)

         * 	- KErrCancel if initialization is cancelled

         *

         */ 

        IMPORT_C void Initialize(TRequestStatus& aStatus);

        /**

         * This method is invoked to cancel @ref CSuplSettings::Initialize().

         *

         * @since S60 3.1

         *

         */

        IMPORT_C void CancelInitialize();

	/**

	 * This method can be used to generate HSLP address from the IMSI

     * obtained during initialization.  

     * HSLP address in the FQDN format can have maximum size of

     * 256 bytes.  Client must allocate enough memory to hold the HSLP address.

     * HSLP address can be generated from IMSI, for example,

     * if HSLP address read from SUPL settings is empty or not valid.  

     * The generated HSLP is in the FQDN format and looks like 

     * "h-slp.mncXXX.mccYYY.3gppnetwork.org" 

     * where XXX and YYY values for MNC and MCC extracted from the IMSI.

     *

     * This method should be invoked only after 

     * @ref Initialize() is completed with KErrNone.  

	 *

     * @since S60 3.1

     *

	 * @param [OUT] aHslpAddress will hold, on successful completion, HSLP address generated 

     * from IMSI obtained during initialization.  HSLP address can be of size 256 bytes.

	 * @return one of the following error codes

	 *	- KErrNone if method completed successfully

     *	- KErrOverflow if the descriptor is too small to hold the HSLP address 

	 *	- KErrNotReady if this method is invoked before @ref Initialize or @ref Initialize has not completed with @p KErrNone

     *	- KErrArgument if argument passed is of length zero

	 */

	IMPORT_C TInt GenerateHslpAddressFromImsi(TDes& aHslpAddress);

    /**

     * This method returns IMSI obtained during initialization of SUPL settings object.  

     * This method should be invoked after @ref Initialize() is completed with KErrNone.  

     *

     * @since S60 3.1

     *

     * @param [OUT] aImsi will hold, on successful completion, IMSI obtained during initialization.  

     * IMSI can have maximum size of 15 characters.

     * If SUPL Settings library is unable to retrieve the IMSI value during initialization, 

     * aImsi will be a descriptor of length zero.

     * @return one of the following error codes returned

     *  - KErrNone if method completed successfully

     *  - KErrNotReady if this method is invoked before @ref Initialize or @ref Initialize has not 

     *  completed with @p KErrNone

     *  - KErrArgument if argument passed is of length zero 

     *  - KErrOverflow if the descriptor is too small to hold the IMSI 

     *

     */

    IMPORT_C TInt GetImsi(TDes& aImsi);

    /**

     * This method compares IMSI value currently stored in SUPL settings storage with

     * IMSI value obtained during initialization. If IMSI value obtained during 

     * initialization and IMSI value stored in SUPL settings storage are same, this method returns false 

     * otherwise true is returned.   

     * This method should be invoked after @ref Initialize() is completed with KErrNone.  

     * 

     * @since S60 3.1

     *

     * @param [OUT] aChanged will hold, on successful completion, one of the following value

     *   - ETrue if IMSI obtained during initialization and IMSI value stored in SUPL settings

     *   are different.

     *   - EFalse if IMSI obtained during initialization and IMSI value stored in SUPL settings

     *   are same.

     * @return one of the following

     *  - KErrNone if method completed successfully

     *  - KErrNotReady if this method is invoked before @ref Initialize or @ref Initialize has not completed with @p KErrNone 

     */

    IMPORT_C TInt IsImsiChanged(TBool& aChanged);

    /**

     *

     * @return one of the following error codes: 

     */

    IMPORT_C TInt GetSuplUsage(TSuplSettingsUsage& aUsage) const;

     *

     *

     * @return one of the following error codes: 

     */

    IMPORT_C TInt SetSuplUsage(TSuplSettingsUsage aUsage);

    /**

     * This method is used to add new server into settings.  It is client's responsibility

     * to set all the parameters in aParamValues except SLP identification.  After adding

     * server entry, the server identity generated will be retuned with aSlpId.  The returned

     * server identity can be used with other methods change any of server parameters. If server 

     * entry with the same server address already presnt, then this method returns error.

     *

     * @since S60 5.1 

     *

     * @param [IN] aParamValues Server parameter values which which the server entry needs to be added 

     * @param [OUT] aSlpId SLP identification for the new server added 

     * @return one of the following error codes: 

     *         - KErrNone if SUPL settings are changed successfully.  

     *         - KErrAlreadyExists if the server address mentioned in aParamValues already present in settings 

     *         - KErrGeneral if changing SUPL settings has failed 

     */ 

    IMPORT_C TInt AddNewServer( 

            const CServerParams *aParamValues, 

            TInt64& aSlpId 

    );

    /**

     * This method is used to change server address parameter in server settings 

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be changed 

     * @param [IN] aServerAddres SUPL Server address 

     * @return one of the following error codes: 

     *         - KErrNone if SUPL settings are changed successfully.  

     *         - KErrArgument if address passed is empty or if the SLP ID passed is not valid 

     *         - KErrGeneral if changing SUPL settings has failed 

     */

    IMPORT_C TInt SetServerAddress( 

            const TInt64 aSlpId, 

            const TDesC& aServerAddress

    );

    /**

     * This method is used to retrieve server address parameter from server settings.  Client

     * has to allocate memory for server address parameter.

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID of server for which the server address needs to be retrieved 

     * @param [OUT] aServerAddres SUPL Server address 

     * @return one of the following error codes: 

     *         - KErrNone if server address is retrieved successfully 

     *         - KErrArgument if the SLP ID passed is not valid 

     */

    IMPORT_C TInt GetServerAddress( 

            TInt64 aSlpId, 

            TDes& aServerAddress

    ) const;

    /**

     * This method is used to change IAP Name in server parameters. IAP name refers to 

     * the access point which is used to access the HSLP over the internet. 

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be changed 

     * @param [IN] aIapName The Internet Access Point Name refers to the access point which is 

     * used to access the HSLP over the internet.  This can have maximum size of 100 characters. 

     * @return one of the following error codes: 

     *         - KErrNone if SUPL settings are changed successfully.  

     *         - KErrArgument if IAP Name is empty or if the SLP ID passed is not valid 

     *         - KErrGeneral if changing SUPL settings has failed 

     */

    IMPORT_C TInt SetIapName( 

            const TInt64 aSlpId, 

            const TDesC& aIapName

    );

    /**

     * This method is used to retrieve IAP Name in server parameters. IAP name refers to 

     * the access point which is used to access the HSLP over the internet. It is client's

     * responsibility to allocate memory for IAP name before invoking this method.

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be retrieved 

     * @param [OUT] aIapName The Internet Access Point Name refers to the access point which is 

     * used to access the HSLP over the internet.  This can have maximum size of 100 characters. 

     * @return one of the following error codes: 

     *         - KErrNone if IAP name is retrieved successfully 

     *	      - KErrOverflow if the descriptor is too small to hold the IAP name 

     *         - KErrArgument if the SLP ID passed is not valid 

     */

    IMPORT_C TInt GetIapName( 

            const TInt64 aSlpId, 

            TDes& aIapName

    ) const;

    /**

     * This method is used to change parameter which indicates whether server

     * can be used for SUPL session or not. 

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be changed 

     * @param [IN] aEnable Flag to indicate whether server can be enabled or not 

     * @return one of the following error codes: 

     *         - KErrNone if SUPL settings are changed successfully.  

     *         - KErrArgument if the SLP ID passed is not valid 

     *         - KErrGeneral if changing SUPL settings has failed 

     */

    IMPORT_C TInt SetServerEnabledFlag(

            const TInt64 aSlpId, 

            const TBool aEnable 

    );

    /**

     * This method is used to retrieve parameter which indicates whether server

     * can be used for SUPL session or not. 

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be retrieved 

     * @param [OUT] aEnable Flag to indicate whether server can be enabled or not 

     * @return one of the following error codes: 

     *         - KErrNone if server available flag is retrieved successfully 

     *         - KErrArgument if the SLP ID passed is not valid 

     */

    IMPORT_C TInt GetServerEnabledFlag(

            const TInt64 aSlpId, 

            TBool& aEnable 

    ) const;

    /**

     * This method is used to change parameter which indicates whether server

     * details can be removed if SIM is changed. 

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be changed 

     * @param [IN] aSimChangeFlag Flag to indicate whether server can be removed or not if there is a SIM change 

     * @return one of the following error codes: 

     *         - KErrNone if SUPL settings are changed successfully.  

     *         - KErrArgument if the SLP ID passed is not valid 

     *         - KErrGeneral if changing SUPL settings has failed 

     */

    IMPORT_C TInt SetSimChangeRemoveFlag(

            const TInt64 aSlpId, 

            const TBool aSimChangeFlag 

    );

    /**

     * This method is used to retrieve parameter which indicates whether server

     * details can be removed if SIM is changed. 

     *

     * @since S60 5.1 

     *

     * @param [IN] aSlpId SLP ID for which the parameter needs to be retrieved 

     * @param [OUT] aSimChangeFlag Flag to indicate whether server can be removed or not if there is a SIM change 

     * @return one of the following error codes: 

     *         - KErrNone if SIM change removal flag is retrieved successfully 

     *         - KErrArgument if the SLP ID passed is not valid 

     */

    IMPORT_C TInt GetSimChangeRemoveFlag(

            const TInt64 aSlpId, 

            TBool& aSimChangeFlag 

    ) const;

    /**

     * This method is used to change parameter which indicates whether server

     * can be used out side home network or not.