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/**
* @file llstatemachine.h
* @brief LLStateMachine class header file.
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLSTATEMACHINE_H
#define LL_LLSTATEMACHINE_H
#include <string>
#include "llerror.h"
#include <map>
class LLUniqueID
{
friend bool operator==(const LLUniqueID &a, const LLUniqueID &b);
friend bool operator!=(const LLUniqueID &a, const LLUniqueID &b);
protected:
static U32 sNextID;
U32 mId;
public:
LLUniqueID(){mId = sNextID++;}
virtual ~LLUniqueID(){}
U32 getID() {return mId;}
};
class LLFSMTransition : public LLUniqueID
{
public:
LLFSMTransition() : LLUniqueID(){};
virtual std::string getName()const { return "unnamed"; }
};
class LLFSMState : public LLUniqueID
{
public:
LLFSMState() : LLUniqueID(){};
virtual void onEntry(void *){};
virtual void onExit(void *){};
virtual void execute(void *){};
virtual std::string getName() const { return "unnamed"; }
};
class LLStateDiagram
{
typedef std::map<LLFSMTransition*, LLFSMState*> Transitions;
friend std::ostream& operator<<(std::ostream &s, LLStateDiagram &FSM);
friend class LLStateMachine;
protected:
typedef std::map<LLFSMState*, Transitions> StateMap;
StateMap mStates;
Transitions mDefaultTransitions;
LLFSMState* mDefaultState;
BOOL mUseDefaultState;
public:
LLStateDiagram();
virtual ~LLStateDiagram();
protected:
// add a state to the state graph, executed implicitly when adding transitions
BOOL addState(LLFSMState *state);
// add a directed transition between 2 states
BOOL addTransition(LLFSMState& start_state, LLFSMState& end_state, LLFSMTransition& transition);
// add an undirected transition between 2 states
BOOL addUndirectedTransition(LLFSMState& start_state, LLFSMState& end_state, LLFSMTransition& transition);
// add a transition that is taken if none other exist
void addDefaultTransition(LLFSMState& end_state, LLFSMTransition& transition);
// process a possible transition, and get the resulting state
LLFSMState* processTransition(LLFSMState& start_state, LLFSMTransition& transition);
// add a transition that exists for every state
void setDefaultState(LLFSMState& default_state);
// return total number of states with no outgoing transitions
S32 numDeadendStates();
// does this state exist in the state diagram?
BOOL stateIsValid(LLFSMState& state);
// get a state pointer by ID
LLFSMState* getState(U32 state_id);
public:
// save the graph in a DOT file for rendering and visualization
BOOL saveDotFile(const std::string& filename);
};
class LLStateMachine
{
protected:
LLFSMState* mCurrentState;
LLFSMState* mLastState;
LLFSMTransition* mLastTransition;
LLStateDiagram* mStateDiagram;
public:
LLStateMachine();
virtual ~LLStateMachine();
// set state diagram
void setStateDiagram(LLStateDiagram* diagram);
// process this transition
void processTransition(LLFSMTransition &transition, void* user_data);
// returns current state
LLFSMState* getCurrentState() const;
// execute current state
void runCurrentState(void *data);
// set state by state pointer
BOOL setCurrentState(LLFSMState *initial_state, void* user_data, BOOL skip_entry = TRUE);
// set state by unique ID
BOOL setCurrentState(U32 state_id, void* user_data, BOOL skip_entry = TRUE);
};
#endif //_LL_LLSTATEMACHINE_H
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