camerauis/cameraxui/cxengine/inc/cxestatemachinebase.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Mon, 03 May 2010 12:22:55 +0300
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permissions -rw-r--r--
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/*
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* Copyright (c) 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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*/
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#ifndef CXESTATEMACHINEBASE_H
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#define CXESTATEMACHINEBASE_H
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#include <QHash>
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#include <QString>
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#include "cxeerror.h"
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class CxeState;
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/**
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* CxeStateMachineBase is used as the base class for all finite state machines in the
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* engine. It's not a fully functional state machine in the sense that it does not provide any
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* mechanism for handling events that would trigged state changes. Instead,
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* it relies on the derived class to call setState() whenever the state
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* should change. The derived class should also provide a list of states
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* and allowed transitions so that CxeStateMachineBase can verify that each state
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* change is valid. A pure virtual function, handleStateChanged() should be
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* implemented by derived classes to handle notifing other interested objects about
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* the state change. This class cannot emit the signals itself, because it does not
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* derived from QObject and it handles all state IDs as plain integers instead of the
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* preferred class specific enumerations.
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*
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* CxeStateMachineBase does not derive from QObject to make easier for the engine
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* control implementation classes to derive from it. Additionally we avoid the overhead
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* brought by QObject.
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*
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* CxeStateMachineBase class is to be used for unit testing. Engine class should derive
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* from CxeStateMachine class.
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*/
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class CxeStateMachineBase
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{
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public:
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    /**
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    * CxeStateMachine constructor.
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    * @sa addState setInitialState
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    * @param stateMachineName  Name for this state machine (used for debug prints)
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    */
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    CxeStateMachineBase(const char* stateMachineName);
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    virtual ~CxeStateMachineBase();
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protected:
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    /**
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     * Add a new state to the machine. Takes ownership of state.
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     *
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     * @param state A CxeState object defining a name, ID, and allowed transitions for the
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     * new state. The CxeState ID must be unique and not to contain overlapping bits with other
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     * state ids, since bitwise AND operator is used for the state ids.
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     * @return False if adding failed due to incorrect id.
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     */
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    virtual bool addState(CxeState *state);
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    /**
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     * Initiate a state transition from current state to a given state ID. In cases that
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     * current state is same as the new state, method returns without doing anything. If the state
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     * transition is invalid, this function return false.
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     *
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     * @param stateId State ID of the new state
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     * @param error   Optional error code to be associated with the transition
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     * @return False if state change fails. True if changing is allowed, or the current state is same
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     * as the new state.
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     */
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    virtual bool setState(int stateId, int error = 0);
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    /**
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     * Set the initial state of the state machine. Can be called only once.
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     * This method will panic, if initial state is unknown, or initial state has already
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     * been set.
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     *
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     * @param stateId State ID for the initial state.
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     * @return False if state to be set intial state is not known, or initial
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     * state has already been set.
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     */
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    virtual bool setInitialState(int stateId);
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    /**
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     * Pure virtual function to be implemented by derived classes. Called when state changes.
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     * The implementation should emit a signal informing interested parties of a state change.
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     *
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     * @param newStateId State ID for the new state
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     * @param error      An error code associated with the state transition
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     */
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    virtual void handleStateChanged(int newStateId, CxeError::Id error) = 0;
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    /**
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     * Get current state ID. It is recommended for derived classes to create
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     * a new method (typically called state()) which returns the current state ID
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     * typecasted into a class specific enumeration.
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     * @return Current state ID
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     */
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    int stateId() const;
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    /**
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     * Verify if a state transition is possible.
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     * @param newStateId  State ID of the new state.
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     * @return Whether state transition is possible.
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     */
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    bool verifyStateChange(int newStateId);
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private:
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    //! Hash table of all states. stateId as key
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    QHash<int, CxeState*> mStates;
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21
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    //! All states ORed together
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    int mStateBitsUsed;
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19
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    //! Current state
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    int mStateId;
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    //! Name of this state machine (for debug prints)
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    QString mName;
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};
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#endif // CXESTATEMACHINEBASE_H
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