--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/utilities/aristatemachine/inc/aristatemachine.h	Fri Jul 23 16:58:44 2010 +0100
@@ -0,0 +1,222 @@
+/*
+* Copyright (c) 2009 Aricent and/or its subsidiary(-ies).
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of the License "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:
+* Aricent - initial contribution.
+*
+* Contributors:
+*
+* Description:
+* State machine for all video hwdevice plugins.
+*
+*/
+
+#ifndef ARISTATEMACHINE_H
+#define ARISTATEMACHINE_H
+
+#include <e32base.h>
+
+#include "ariprint.h"
+
+
+// Constants
+const TUint KNumOfStates    = 13;
+const TUint	KNumOfCommands	= 8;
+
+class CStateMachine : public CBase
+{
+public:
+	/**
+     * All the states of the state machine.
+	 */
+	enum TState
+		{
+		EUnInitialized = 0,
+		EInitializing,
+		EInitialized,
+		EStart,
+		EPause,
+		EStop,
+		EInitializedInStopping,
+		EStopping,
+		EPauseInStopping,
+		EStopInInputEnd,
+		EInitializedDeadState,
+		ENonInitializedDeadState,
+		EInvalidState
+		};
+	/**
+     * Commands that are given to state machine
+	 */
+	enum TCommand
+		{
+		EInitializeCommand = 0 ,
+		EInitializingCommand,
+		EStartCommand,
+		EPauseCommand,
+		EResumeCommand,
+		EInputEndCommand,
+		EStopCommand,
+		EDeadStateCommand
+		};
+
+public:
+
+	/**
+	 *Constructor. State will be in EUnInitialized
+	 *
+	 *@param	"None"
+	 *@leave	"None"
+	 *@return	"None"
+	 */
+	IMPORT_C static CStateMachine* NewL();
+
+	/**
+	 *Checks whether transition to new state is possible or not
+	 *
+	 *@param	"aCommand"	"Command for the transition"
+	 *@leave	"None"
+	 *@return	"Return ETrue if transition is valid, else EFalse
+	 */
+	IMPORT_C TBool	IsTransitionValid (TCommand aCommand);
+
+	/**
+	 *Transits to new state. If transition cann't be done, object will
+	 *remain in the previous state.
+	 *
+	 *@param	"aCommand"	"Command for the transition"
+	 *@return	"Return KErrNone if transition happens else error.
+	 */
+	IMPORT_C TInt	Transit (TCommand aCommand);
+
+	/**
+	 *Tells whether the state is initialized or not. Here initilized means
+	 *if the state is in any state other than EUnInitialized
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue, if state is initialized else EFalse.
+	 */
+	IMPORT_C TBool	IsInitialized ();
+
+	/**
+	 *Tells whether the state is exactly in EInitialized state or not.
+	 *
+	 *@param	"None"
+	 *@return	Return ETrue, if in EInitialized state else EFalse.
+	 */
+    IMPORT_C TBool IsInInitializedState ();
+
+	/**
+	 *Tells whether the state is in initializing state or not.
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue, if state is initializing else EFalse.
+	 */
+	IMPORT_C TBool	IsInitializing ();
+
+	/**
+	 *Tells whether the state is in any one of the input ending states i.e
+	 *	EInitializedInStopping,
+	 *	EStopping,
+	 *	EPauseInStopping,
+	 *	EStopInInputEnd
+	 *
+	 *
+	 *@param	None
+	 *@return	Return ETrue, if state is in any of inputend state else EFalse
+	 */
+	IMPORT_C TBool	IsInputEndPending ();
+
+	/**
+	 *Tells whether state is in EStart state
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue if state is EStart, elase EFalse
+	 */
+	IMPORT_C TBool	IsStarted ();
+
+	/**
+	 *Tells whether state is in EPause state
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue if state is EPause, elase EFalse
+	 */
+	IMPORT_C TBool	IsPaused ();
+
+	/**
+	 *Tells whether state is in EStop state
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue if state is EStop, elase EFalse
+	 */
+	IMPORT_C TBool	IsStopped ();
+
+	/**
+	 *Tells whether state is in EPlaying state
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue if state is EPlaying, elase EFalse
+	 */
+	IMPORT_C TBool	IsPlaying ();
+
+	/**
+	 *Tells whether state is in EInitializedDeadState/ENonInitializedDeadState
+	 *state
+	 *
+	 *@param	"None"
+	 *@return	"Return ETrue if state is
+	 *           Return EInitializedDeadState/ENonInitializedDeadState,
+	 *           elase EFalse"
+	 */
+	IMPORT_C TBool	IsInDeadState ();
+
+	/**
+	 *Resets the state machine to EUnInitialized state
+	 *
+	 *@param	"None"
+	 *@return	"None"
+	 */
+	IMPORT_C void	Reset();
+
+	/**
+	 * Returns whether the current state is in initailize or not
+	 *
+	 *@return	"ETrue if current state is in Initailize"
+	 */
+	IMPORT_C TBool IfIsStateInInitailize();
+
+
+	/**
+	 * Destructor of the statemachine
+	 *
+	 *@return	"None"
+	 */
+	~CStateMachine();
+
+private:
+
+	/**
+	 *Symbian 2nd phase constructor
+	 *@return	"None"
+	 */
+	void ConstructL();
+
+    /**
+	 *Default Constructor
+	 */
+	CStateMachine();
+
+private:
+	//Stores the state of the state machine
+	TState			iState;
+
+	TState			iStateChanges[KNumOfStates][KNumOfCommands];
+};
+
+#endif // ARISTATEMACHINE_H
+