170 lines
3.4 KiB
C++
170 lines
3.4 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS).
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* OwlPS is a project of the University of Franche-Comté
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* (Université de Franche-Comté), France.
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*/
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#ifndef _OWLPS_POSITIONING_MEASUREMENT_HH_
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#define _OWLPS_POSITIONING_MEASUREMENT_HH_
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#include "accesspoint.hh"
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#include <vector>
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#include <ostream>
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#include <cmath>
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typedef int_fast16_t ss_t ;
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/// Represents a list of signal strengths captured by one AccessPoint
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class Measurement
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{
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protected:
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/// The AccessPoint that performed the measurement
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AccessPoint *ap ;
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/// List of signal strengths captured (in dBm)
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std::vector<ss_t> ss_list ;
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/// Average of all signal strength captured (dBm)
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double average_ss ;
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/** @name Operations */
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//@{
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/// Recalculates #average_ss from #ss_list
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void update_average_ss(void) ;
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//@}
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public:
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Measurement(const AccessPoint *_ap = NULL) ;
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Measurement(const AccessPoint *_ap,
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const std::vector<ss_t> &_ss_list) ;
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Measurement(const Measurement &source):
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ap(source.ap), ss_list(source.ss_list),
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average_ss(source.average_ss) {}
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~Measurement(void) ;
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/** @name Read accessors */
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//@{
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AccessPoint* get_ap() const ;
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const std::vector<ss_t>& get_ss_list() const ;
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double get_average_ss() const ;
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int get_ss_list_size() const ;
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//@}
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/** @name Write accessors */
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//@{
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void set_ap(const AccessPoint *_ap) ;
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void set_ss_list(const std::vector<ss_t> &_ss_list) ;
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/// Adds a signal strength to #ss_list
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void add_ss(const ss_t &ss_dbm) ;
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/// Adds several signal strengths to #ss_list
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void add_ss_list(const std::vector<ss_t> &_ss_list) ;
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/// Merges a given Measurement into the current Measurement
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void merge(const Measurement &source) ;
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void clear(void) ;
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//@}
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/** @name Operations */
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//@{
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/// Computes the distance to another Measurement in SS space
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float ss_square_distance(const Measurement &source) const ;
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/// Computes the distance to another SS value
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float ss_square_distance(const float &ss) const ;
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//@}
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/** @name Operators */
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//@{
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Measurement& operator=(const Measurement &m) ;
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bool operator==(const Measurement &m) const ;
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bool operator!=(const Measurement &m) const ;
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operator bool(void) const ;
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//@}
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/// Displays a Measurement
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friend std::ostream &operator<<(std::ostream &os, const Measurement &m) ;
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} ;
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/* *** Read accessors *** */
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inline AccessPoint* Measurement::get_ap() const
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{
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return ap ;
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}
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inline const std::vector<ss_t>& Measurement::get_ss_list() const
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{
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return ss_list ;
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}
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inline double Measurement::get_average_ss() const
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{
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return average_ss ;
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}
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inline int Measurement::get_ss_list_size() const
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{
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return ss_list.size() ;
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}
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/* *** Write accessors *** */
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inline void Measurement::set_ap(const AccessPoint *_ap)
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{
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ap = const_cast<AccessPoint*>(_ap) ;
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}
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/* *** Operations *** */
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inline float Measurement::
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ss_square_distance(const Measurement &source) const
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{
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return ss_square_distance(source.average_ss) ;
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}
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inline float Measurement::ss_square_distance(const float &ss) const
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{
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return ((ss - average_ss) * (ss - average_ss)) ;
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}
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/* *** Operators *** */
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inline bool Measurement::operator!=(const Measurement &m) const
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{
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return !(*this == m) ;
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}
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/**
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* @return \em false if the Measurement is empty.
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* @return \em true if at least one attribute is initialised.
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*/
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inline Measurement::operator bool() const
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{
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return
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ap != NULL ||
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! ss_list.empty() ;
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}
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#endif // _OWLPS_POSITIONING_MEASUREMENT_HH_
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