Enge.h

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#ifndef ENDFIELDMODEL_ENGE_H_
#define ENDFIELDMODEL_ENGE_H_

#include <iostream>
#include <vector>

#include "AbsBeamline/EndFieldModel/EndFieldModel.h"

namespace endfieldmodel {

class Enge : public EndFieldModel {
  public:
    Enge() : _a(), _lambda(0.) {SetEngeDiffIndices(10);}
    Enge(const std::vector<double> a, double x0, double lambda, int max_index)
        : _a(a), _lambda(lambda), _x0(x0) {SetEngeDiffIndices(max_index);}
    ~Enge() {}

    Enge* Clone() const;

    std::vector<double> GetEngeParameters() const {return _a;}

    void                SetEngeParameters(std::vector<double> a) {_a = a;}

    inline double       GetLambda() const {return _lambda;}

    inline void         SetLambda(double lambda) {_lambda = lambda;}

    inline double       GetX0() const {return _x0;}

    inline void         SetX0(double x0) {_x0 = x0;}

    double GetEnge(double x, int n) const;

    inline double GetDoubleEnge(double x, int n) const;

    double HN(double x, int n) const;

    double GN(double x, int n) const;

    static void   SetEngeDiffIndices(size_t n);

    inline static std::vector< std::vector<int> > GetQIndex(int n);

    inline static std::vector< std::vector<int> > GetHIndex(int n);
  private:
    std::vector<double> _a;
    double              _lambda, _x0;

    static std::vector< std::vector< std::vector<int> > > _q;
    static std::vector< std::vector< std::vector<int> > > _h;
};

std::vector< std::vector<int> > Enge::GetQIndex(int n) {
  SetEngeDiffIndices(n);
  return _q[n];
}

std::vector< std::vector<int> > Enge::GetHIndex(int n) {
  SetEngeDiffIndices(n);
  return _h[n];
}

double Enge::GetDoubleEnge(double x, int n) const {
  if (n == 0) {
    return (GetEnge(x-_x0, n)+GetEnge(-x-_x0, n))-1.;
  } else {
    if (n%2 != 0) return GetEnge(x-_x0, n)-GetEnge(-x-_x0, n);
    else          return GetEnge(x-_x0, n)+GetEnge(-x-_x0, n);
  }
}

}

#endif