state.h

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#ifndef __STATE_H__
#define __STATE_H__

#include <unordered_map>


class State {
public:
    virtual double pressure(double x, double y, double z)=0;
    virtual double density(double x, double y, double z)=0;
    virtual void velocity(double x, double y, double z, double& vX, double& vY, double& vZ)=0;
    virtual ~State() {};
};









class GaussianPressureState: public State {
public:
    GaussianPressureState();
    
    virtual ~GaussianPressureState() {};
    
    virtual double pressure(double x, double y, double z);
    
    virtual double density(double x, double y, double z);
    
    virtual void velocity(double x, double y, double z, double& vX, double& vY, double& vZ);    
private:
    double m_fDen; 
    double m_fVelX, m_fVelY, m_fVelZ; 
    double m_fPCenX, m_fPCenY, m_fPCenZ; 
    double m_fPPeak; 
    double m_fPCoeff; 
};







class UniformVelocityState: public State {
public:
    UniformVelocityState();
    virtual ~UniformVelocityState() {};
    
    virtual double pressure(double x, double y, double z);
    
    virtual double density(double x, double y, double z);
    
    virtual void velocity(double x, double y, double z, double& vX, double& vY, double& vZ);    
private:
    double m_fDen; 
    double m_fPressure; 
    double m_fVelocity; 
    double m_fCenX, m_fCenY, m_fCenZ; 
};








class StateFactory {
public:
    typedef State* (*StateCreateFunc)();
    
    static StateFactory& instance(); 
    
    void registerState(std::string name, StateCreateFunc func);

    State* createState(std::string name);   

private:    
    std::unordered_map<std::string, StateCreateFunc> stateTable; 
    StateFactory() {}; 
    StateFactory(const StateFactory& other); 
    StateFactory& operator=(const StateFactory& other); 

};

#endif // __STATE_H__