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