/*

* Copyright (c) 2009 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:  Main handler for incoming requests

*

*/

#ifndef C_LEGACYMODEMPLUGIN_H

#define C_LEGACYMODEMPLUGIN_H

#include <atextpluginbase.h>

class CLegacyModemPlugin;

/** Character types: carriage return, line feed or backspace */

enum TCharacterTypes

    {

    ECharTypeCR,  // Carriage return

    ECharTypeLF,  // Line feed

    ECharTypeBS   // Backspace

    };

/** Type of modes (quiet, verbose) */

enum TModeTypes

    {

    EModeTypeQuiet,   // Quiet mode

    EModeTypeVerbose  // Verbose mode

    };

/**  Handler types for the four types */

enum TCmdHandlerType

    {

    ECmdHandlerTypeUndefined = KErrNotFound,

    ECmdHandlerTypeBase      = 0x01,  // For command "AT+COMMAND"

    ECmdHandlerTypeSet       = 0x02,  // For command "AT+COMMAND="

    ECmdHandlerTypeRead      = 0x04,  // For command "AT+COMMAND?"

    ECmdHandlerTypeTest      = 0x08,  // For command "AT+COMMAND=?"

    };

/**

 *  Class for common AT command handler interface

 *

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CLegacyModemPluginBase )

    {

public:

    virtual ~CLegacyModemPluginBase() {};

    /**

     * Reports the support status of an AT command. This is a synchronous API.

     *

     * @param aCmd The AT command. Its format may vary depending on the

     *             specification. E.g. in BT HFP case, the command may contain

     *             a character carriage return (<cr>) in the end.

     * @return ETrue if the command is supported; EFalse otherwise.

     */

    virtual TBool IsCommandSupported( const TDesC8& aCmd ) = 0;

    /**

     * Handles an AT command. Cancelling of the pending request is done by

     * HandleCommandCancel(). The implementation in the extension plugin should

     * be asynchronous.

     *

     * The extension plugin which accepts this command is responsible to supply

     * the result codes and response and to format result codes properly, e.g.

     * in BT HFP case, the format should be <cr><lf><result code><cr><lf>

     *

     * After an extension plugin has handled or decided to reject the given AT

     * command, it must inform ATEXT by HandleCommandCompleted() with a proper

     * error code.

     *

     * @since S60 5.0

     * @param aCmd The AT command to be handled. Its format may vary depending

     *             on the specification. E.g. in BT HFP case, the command may

     *             contain a character carriage return (<cr>) in the end.

     * @param aReply When passed in, contains the built in answer filled by

     *               ATEXT if it is not empty; when command handling completes

     *               successfully, contains the result codes and responses to

     *               this command; Its ownership always belongs to ATEXT, plugin

     *               may reallocate its space when needed.

     * @param aReplyNeeded Reply needed if ETrue, no reply otherwise. If EFalse,

     *                     the aReply must not contain the reply, otherwise it

     *                     must contain verbose or numeric reply (ATV0/1) or an

     *                     empty string reply (with ATQ).

     * @return None

     */

    virtual void HandleCommand( const TDesC8& aCmd,

                                RBuf8& aReply,

                                TBool aReplyNeeded ) = 0;

    /**

     * Cancels a pending HandleCommand request.

     *

     * @since S60 5.0

     * @return None

     */

    virtual void HandleCommandCancel() = 0;

    };

/**

 *  Class for accessing plugin information and common functionality

 *

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( MLegacyModemPlugin )

    {

public:

    /**

     * Creates an AT command reply based on the reply type and completes the

     * request to ATEXT. Uses iReplyBuffer for reply storage.

     *

     * @since S60 5.0

     * @param aReplyType Type of reply

     * @param aSrcBuffer Source buffer; used only if aReplyType is EReplyTypeOther

     * @param aError Completion code. If not KErrNone then other arguments are

     *               ignored and the request is completed to ATEXT with

     *               EReplyTypeUndefined.

     * @return None

     */

    virtual TInt CreateReplyAndComplete( TATExtensionReplyType aReplyType,

                                         const TDesC8& aSrcBuffer=KNullDesC8,

                                         TInt aError=KErrNone ) = 0;

    /**

     * Creates a buffer for "OK" or "ERROR" reply based on the line settings

     *

     * @since S60 5.0

     * @param aReplyBuffer Destination buffer for the created reply

     * @param aOkReply ETrue if "OK" reply needed,

     *                 EFalse if "ERROR" reply needed

     * @return Symbian error code on error, KErrNone otherwise

     */

    virtual TInt CreateOkOrErrorReply( RBuf8& aReplyBuffer,

                                       TBool aOkReply ) = 0;

    /**

     * Checks if the command is a base, set, read or test type of command

     *

     * @since S60 5.0

     * @param aCmdBase Base part of the command to check

     * @param aCmdFull Full command to check

     * @return Type of command

     */

    virtual TCmdHandlerType CheckCommandType( const TDesC8& aCmdBase,

                                              const TDesC8& aCmdFull ) = 0;

    };

/**

 *  Class for selecting handlers for different AT commands

 *

 *  @since S60 v5.0

 */

NONSHARABLE_CLASS( CLegacyModemPlugin ) : public CATExtPluginBase,

                                          public MLegacyModemPlugin

    {

public:

    /**

     * Two-phased constructor.

     * @return Instance of self

     */

    static CLegacyModemPlugin* NewL();

    /**

    * Destructor.

    */

    virtual ~CLegacyModemPlugin();

private:

    CLegacyModemPlugin();

    void ConstructL();

    /**

     * Reports connection identifier name to the extension plugin.

     *

     * @since S60 5.0

     * @param aName Connection identifier name

     * @return None

     */

    void ReportConnectionName( const TDesC8& aName );

    /**

     * Reports the support status of an AT command. This is a synchronous API.

     *

     * @param aCmd The AT command. Its format may vary depending on the

     *             specification. E.g. in BT HFP case, the command may contain

     *             a character carriage return (<cr>) in the end.

     * @return ETrue if the command is supported; EFalse otherwise.

     */

    TBool IsCommandSupported( const TDesC8& aCmd );

    /**

     * Handles an AT command. Cancelling of the pending request is done by

     * HandleCommandCancel(). The implementation in the extension plugin should

     * be asynchronous.

     *

     * The extension plugin which accepts this command is responsible to supply

     * the result codes and response and to format result codes properly, e.g.

     * in BT HFP case, the format should be <cr><lf><result code><cr><lf>

     *

     * After an extension plugin has handled or decided to reject the given AT

     * command, it must inform ATEXT by HandleCommandCompleted() with a proper

     * error code.

     *

     * @since S60 5.0

     * @param aCmd The AT command to be handled. Its format may vary depending

     *             on the specification. E.g. in BT HFP case, the command may

     *             contain a character carriage return (<cr>) in the end.

     * @param aReply When passed in, contains the built in answer filled by

     *               ATEXT if it is not empty; when command handling completes

     *               successfully, contains the result codes and responses to

     *               this command; Its ownership always belongs to ATEXT, plugin

     *               may reallocate its space when needed.

     * @param aReplyNeeded Reply needed if ETrue, no reply otherwise. If EFalse,

     *                     the aReply must not contain the reply, otherwise it

     *                     must contain verbose or numeric reply (ATV0/1) or an

     *                     empty string reply (with ATQ).

     * @return None

     */

    void HandleCommand( const TDesC8& aCmd, RBuf8& aReply, TBool aReplyNeeded );

    /**

     * Cancels a pending HandleCommand request.

     *

     * @since S60 5.0

     * @return None

     */

    void HandleCommandCancel();

    /**

     * Next reply part's length.

     * The value must be equal or less than KDefaultCmdBufLength.

     * When the reply from this method is zero, ATEXT stops calling

     * GetNextPartOfReply().

     *

     * @since S60 5.0

     * @return Next reply part's length if zero or positive

     */

    TInt NextReplyPartLength();

    /**

     * Gets the next part of reply initially set by HandleCommandComplete().

     * Length of aNextReply must be equal or less than KDefaultCmdBufLength.

     *

     * @since S60 5.0

     * @param aNextReply Next reply

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt GetNextPartOfReply( RBuf8& aNextReply );

    /**

     * Receives unsolicited results. Cancelling of the pending request is done

     * by ReceiveUnsolicitedResultCancel(). The implementation in the extension

     * plugin should be asynchronous.

     *

     * @since S60 5.0

     * @return None

     */

    void ReceiveUnsolicitedResult();

    /**

     * Cancels a pending ReceiveUnsolicitedResult request.

     *

     * @since S60 5.0

     * @return None

     */

    void ReceiveUnsolicitedResultCancel();

    /**

     * Reports NVRAM status change to the plugins.

     *

     * @since S60 5.0

     * @param aNvram New NVRAM status. Each call of this function is a result

     *               of DUN extracting the form notified by

     *               CATExtCommonBase::SendNvramStatusChange(). Each of the

     *               settings from SendNvramStatusChange() is separated to

     *               one call of ReportNvramStatusChange().

     * @return None

     */

    void ReportNvramStatusChange( const TDesC8& aNvram );

    /**

     * Reports about external handle command error condition.

     * This is for cases when for example DUN decided the reply contained an

     * error condition but the plugin is still handling the command internally.

     * Example: in command line "AT+TEST;ATDT1234" was given. "AT+TEST" returns

     * "OK" and "ATDT" returns "CONNECT". Because "OK" and "CONNECT" are

     * different reply types the condition is "ERROR" and DUN ends processing.

     * This solution keeps the pointer to the last AT command handling plugin

     * inside ATEXT and calls this function there to report the error.

     * It is to be noted that HandleCommandCancel() is not sufficient to stop

     * the processing as the command handling has already finished.

     *

     * @since S60 5.0

     * @return None

     */

    void ReportExternalHandleCommandError();

    /**

     * Creates part of reply from the global reply buffer to the destination

     * buffer. Used with APIs which need the next part of reply in multipart

     * reply requests.

     *

     * @since S60 5.0

     * @param aDstBuffer Destination buffer; the next part of reply is stored to

     *                   this buffer.

     * @return None

     */

    TInt CreatePartOfReply( RBuf8& aDstBuffer );

    /**

     * Appends one parameter to array for GetParameterArray()

     *

     * @since S60 5.0

     * @param aParams Array of supported commands

     * @param aStartIndex Start index for the parameter to be added

     * @param aEndIndex End index for the parameter to be added

     * @return None

     */

    void AppendOneParameterLC( RPointerArray<HBufC8>& aParams,

                               TInt& aStartIndex,

                               TInt aEndIndex );

// from base class MLegacyModemPlugin

    /**

     * From MLegacyModemPlugin.

     * Creates an AT command reply based on the reply type and completes the

     * request to ATEXT. Uses iReplyBuffer for reply storage.

     *

     * @since S60 5.0

     * @param aReplyType Type of reply

     * @param aSrcBuffer Source buffer; used only if aReplyType is EReplyTypeOther

     * @param aError Completion code. If not KErrNone then other arguments are

     *               ignored and the request is completed to ATEXT with

     *               EReplyTypeUndefined.

     * @return None

     */

    TInt CreateReplyAndComplete( TATExtensionReplyType aReplyType,

                                 const TDesC8& aSrcBuffer=KNullDesC8,

                                 TInt aError=KErrNone );

    /**

     * From MLegacyModemPlugin.

     * Creates a buffer for "OK" or "ERROR" reply based on the line settings

     *

     * @since S60 5.0

     * @param aReplyBuffer Destination buffer for the created reply

     * @param aOkReply ETrue if "OK" reply needed,

     *                 EFalse if "ERROR" reply needed

     * @return Symbian error code on error, KErrNone otherwise

     */

    TInt CreateOkOrErrorReply( RBuf8& aReplyBuffer,

                               TBool aOkReply );

    /**

     * From MLegacyModemPlugin.

     * Checks if the command is a base, set, read or test type of command

     *

     * @since S60 5.0

     * @param aCmdBase Base part of the command to check

     * @param aCmdFull Full command to check

     * @return Type of command

     */

    TCmdHandlerType CheckCommandType( const TDesC8& aCmdBase,

                                      const TDesC8& aCmdFull );

private:  // data

    /**

     * AT commands handler array. Used for mapping HandleCommand() to

     * IsCommandSupported() and to limit the number of string comparisons.

     */

    RPointerArray<CLegacyModemPluginBase> iHandlers;

    /**

     * Current AT command handler in iHandlers.

     * Used when IsCommandSupported() detects a matching handler class.

     */

    CLegacyModemPluginBase* iHandler;

    /**

     * Buffer for handle command's command

     * Not own.

     */

    const TDesC8* iHcCmd;

    /**

     * Buffer for handle command reply

     * Not own.

     */

    RBuf8* iHcReply;

    /**

     * Global reply buffer for the AT command replies

     */

    RBuf8 iReplyBuffer;

    };

#endif  // C_LEGACYMODEMPLUGIN_H