182 lines
3.5 KiB
C++
182 lines
3.5 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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#include "measurement.hh"
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#include "posexcept.hh"
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using namespace std ;
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/* *** Constructors *** */
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Measurement::Measurement(const AccessPoint *_ap):
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ap(const_cast<AccessPoint*>(_ap)), average_ss(0)
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{
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ss_list.reserve(10) ;
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}
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Measurement::Measurement(const AccessPoint *_ap,
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const vector<ss_t> &_ss_list):
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ap(const_cast<AccessPoint*>(_ap)), ss_list(_ss_list)
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{
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ss_list.reserve(10) ;
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update_average_ss() ;
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}
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/**
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* Note that values pointed by #ap are not deleted.
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*/
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Measurement::~Measurement()
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{
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ss_list.clear() ;
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}
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/* *** Write accessors *** */
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/**
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* @param ss_dbm The signal strength to add to #ss_list (in dBm).
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*/
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void Measurement::add_ss(const ss_t &ss_dbm)
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{
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double total_ss_mwatts =
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pow(10, static_cast<double>(ss_dbm) / 10.0) + // New SS in mW
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(ss_list.size() * pow(10, average_ss / 10.0)) ; // Other values in mW
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ss_list.push_back(ss_dbm) ; // Add new value (dBm)
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// Update average converting back in dBm
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average_ss = 10.0 * log10(total_ss_mwatts / ss_list.size()) ;
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}
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void Measurement::set_ss_list(const std::vector<ss_t> &_ss_list)
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{
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ss_list = _ss_list ;
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update_average_ss() ;
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}
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void Measurement::add_ss_list(const std::vector<ss_t> &_ss_list)
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{
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ss_list.insert(ss_list.end(), _ss_list.begin(), _ss_list.end()) ;
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update_average_ss() ;
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}
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/**
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* Merge consists of adding the SS values of \em source to #ss_list. It
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* is possible only if the #ap of the two Measurement are identical.
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* @throw cannot_merge if the AP of the two Measurement are different.
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*/
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void Measurement::merge(const Measurement &source)
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{
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if (ap != source.ap)
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throw cannot_merge(
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"error when trying to merge measurements, APs are different") ;
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add_ss_list(source.ss_list) ;
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}
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/**
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* - #ap is not deleted, only initialised to NULL.
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* - #ss_list is cleared.
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* - #average_ss is initialised to 0.
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*/
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void Measurement::clear()
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{
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ss_list.clear() ;
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average_ss = 0 ;
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ap = NULL ;
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}
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/* *** Operations *** */
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void Measurement::update_average_ss()
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{
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if (ss_list.empty())
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{
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average_ss = 0 ;
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return ;
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}
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double total_ss_mwatts = 0 ;
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for (vector<ss_t>::const_iterator i = ss_list.begin() ;
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i != ss_list.end() ; ++i)
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// Add the current value in mW to the total
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total_ss_mwatts += pow(10, static_cast<double>(*i) / 10.0) ;
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// Compute the average in mW and convert it to dBm
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average_ss = 10 * log10(total_ss_mwatts / ss_list.size()) ;
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}
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/* *** Operators *** */
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Measurement& Measurement::operator=(const Measurement &m)
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{
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if (this == &m)
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return *this ;
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ap = m.ap ;
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ss_list = m.ss_list ;
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average_ss = m.average_ss ;
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return *this ;
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}
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bool Measurement::operator==(const Measurement &m) const
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{
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if (this == &m)
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return true ;
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return
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ap == m.ap &&
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ss_list == m.ss_list &&
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average_ss == m.average_ss ;
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}
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ostream &operator<<(ostream &os, const Measurement &m)
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{
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// MAC address
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os
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<< "AP: " << (m.ap != NULL ? m.ap->get_mac_addr() : "Unknown_AP")
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<< ": " ;
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// List of SS
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if (m.ss_list.empty())
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os << "No values" ;
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else
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for (vector<ss_t>::const_iterator i = m.ss_list.begin() ;
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i != m.ss_list.end() ; ++i)
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{
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os << *i ;
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if (i != m.ss_list.end() - 1)
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os << ";" ;
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}
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os << " [AVG=" << m.average_ss << "]" ;
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return os ;
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}
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