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