pointfilter.h

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#ifndef POINT_FILTER_H
#define POINT_FILTER_H

#include <string>
#include <map>

class Checker;


class PointFilter
{
public:
  // Default empty constructor
  PointFilter();
  PointFilter(const std::string& params);
  ~PointFilter();

  PointFilter& setRange(double maxDist, double minDist);
  PointFilter& setHeight(double top, double bottom);

  std::string getParams();

  inline bool check(double* point);
private:
  std::map<std::string, std::string> m_params;

  bool m_changed;

  Checker* m_checker;

  void createCheckers();

  // factory magic
  template<typename T> friend struct CheckerFactory;
  static std::map<std::string, Checker* (*)(const std::string&)>* factory;
};

class Checker {
public:
  Checker();
  ~Checker();

  virtual bool test(double* point) = 0;

  Checker* m_next;
};

template<typename T>
struct CheckerFactory {
  CheckerFactory(const std::string& key) { (*PointFilter::factory)[key] = CheckerFactory<T>::create; }
  static Checker* create(const std::string& value) { try { return new T(value); } catch(...) { return 0; } }
};

class CheckerRangeMax : public Checker {
public:
  CheckerRangeMax(const std::string& value);
  virtual bool test(double* point);
private:
  double m_max;
};

class CheckerRangeMin : public Checker {
public:
  CheckerRangeMin(const std::string& value);
  virtual bool test(double* point);
private:
  double m_min;
};

class CheckerHeightTop : public Checker {
public:
  CheckerHeightTop(const std::string& value);
  virtual bool test(double* point);
private:
  double m_top;
};

class CheckerHeightBottom : public Checker {
public:
  CheckerHeightBottom(const std::string& value);
  virtual bool test(double* point);
private:
  double m_bottom;
};

#include "pointfilter.icc"

#endif //POINT_FILTER_H