author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Thu, 19 Aug 2010 10:27:19 +0300 | |
branch | RCL_3 |
changeset 37 | 5f1cd966e0d9 |
parent 0 | b16258d2340f |
permissions | -rw-r--r-- |
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// Copyright (c) 2002-2009 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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#ifndef __CDRIVERBASE_H__ |
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#define __CDRIVERBASE_H__ |
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#include <e32base.h> |
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#include "mdriverobserver.h" |
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/** @class CDriverBase |
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The CDriverBase is an abstract class that provides command running |
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functionality. There are two types of commands - 'Do' and 'Expect' commands. |
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A 'Do' command implies that the concrete driver must perform an action. The |
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concrete class is notified of the action via its override of the RunCmdL() |
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function. |
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Once the 'Do' command has been performed, the next command is extracted from |
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the command stack. If it is another 'Do' command, then the driver base self- |
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completes and the RunCmdL() function is called again. For an 'Expect' command |
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the driver base waits until the concrete class it invoked. |
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When a concrete class is invoked on one of its APIs it can check to see if |
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that invocation was expected by asking this base class, passing the the |
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command ID of the invoked function in the ExpecetedCmd() API. |
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If the invoked command was expected, the next command is extracted from the |
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command stack as described earlier. |
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A derived class must form the command stack using the AppendDoCmdL() and the |
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AppendExpectCmdL() APIs. The commands should be appended in running order. |
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@componentInternal |
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*/ |
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class CDriverBase : public CActive, |
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public MDriverObserver |
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{ |
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private: // helper class |
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/** @class TCmdEntry |
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The TCmdEntry class is a helper class for CDriverBase. It encapsulates a |
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command ID and its type. |
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@componentInternal |
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*/ |
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class TCmdEntry |
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{ |
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public: // enums |
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/** @enum TCmdType |
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An enumeration defining the types of commands. |
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*/ |
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enum TCmdType |
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{ |
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/** A 'Do' type command. This type of command implies that the driver |
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object must perform an action. |
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*/ |
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EDoCmd =0, |
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/** An 'Expect' type command. This type of command implies that the |
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driver expects an invocation on its API. |
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*/ |
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EExpectCmd |
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}; |
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public: // methods |
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inline TCmdEntry(); |
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inline TCmdEntry(TInt aCmd, TCmdType aType); |
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public: // attributes |
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TInt iCmd; |
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TCmdType iType; |
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}; |
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public: // methods |
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virtual ~CDriverBase(); |
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void Start(); |
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private: // methods from CActive |
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virtual void RunL(); |
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virtual void DoCancel(); |
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virtual TInt RunError(TInt aError); |
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private: // methods from MDriverObserver |
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virtual void NotifyError(TInt aError); |
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virtual void NotifyStart(); |
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virtual void NotifyComplete(); |
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virtual void Log(const TDesC& aComment); |
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protected: // methods |
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CDriverBase(MDriverObserver& aObserver); |
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TBool TestExpectedCmd(TInt aCmd, TInt aError); |
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void AppendExpectCmdL(TInt aCmd); |
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void AppendDoCmdL(TInt aCmd); |
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void DoLog(const TDesC& aComment); |
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private: // methods |
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/** @fn RunCmdL(TInt aCmd) =0 |
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Requests the command with ID aCmd is run. |
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@componentInternal |
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@param aCmd The ID of the command to run. |
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*/ |
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virtual void RunCmdL(TInt aCmd) =0; |
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private: // methods |
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void CompleteSelf(); |
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void NextCmd(); |
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private: // attributes |
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MDriverObserver& iObserver; |
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TInt iCurrentCmd; |
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RArray<TCmdEntry> iCmdStack; |
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TInt iNextCmd; |
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}; |
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inline CDriverBase::TCmdEntry::TCmdEntry() |
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/** |
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Default constructor. Object not initialised. |
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@componentInternal |
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*/ |
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{ |
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} |
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inline CDriverBase::TCmdEntry::TCmdEntry(TInt aCmd, TCmdType aType) |
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: iCmd(aCmd), iType(aType) |
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/** |
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Default constructor. Object is initialised. |
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@componentInternal |
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@param aCmd The command ID. |
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@param aType The command type. |
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*/ |
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{ |
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} |
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#endif // __CDRIVERBASE_H__ |