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user.cpp
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user.cpp
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#include <cstdlib>
#include <assert.h>
#include <iostream>
#include <sstream>
#include <algorithm>
#include <cmath>
#include <boost/date_time/gregorian/gregorian.hpp>
#include "user.h"
#include "antenna_model.h"
#include "utils.h"
using std::cerr;
using std::endl;
using std::abs;
using std::stringstream;
using boost::gregorian::date;
using boost::gregorian::date_duration;
void User::to_event(valarray<int> event_data, Event* event)
{
event->user_id = event_data[EV_UID];
event->antenna_id = event_data[EV_ANTENNA];
event->time = ptime(date(event_data[EV_YEAR], event_data[EV_MONTH],
event_data[EV_DAY]), time_duration(event_data[EV_HOUR],
event_data[EV_MINUTE], event_data[EV_SECOND]));
// Can't use time_from_string because we're passing a valarray of ints
}
string User::to_json(Event* event, bool is_prediction)
{
stringstream json;
json << "{" << endl;
json << "\t\"uid\" : " << event->user_id << "," << endl;
json << "\t\"antenna\" : " << event->antenna_id << "," << endl;
json << "\t\"time\" : \"" << to_simple_string(event->time) << "\"," << endl;
json << "\t\"is_prediction\" : " << (is_prediction ? "true" : "false")
<< endl;
json << "}";
return json.str();
}
int User::to_minutes(time_duration duration)
{
return duration.total_seconds() / 60;
}
bool User::earlier_event_time(Event* a, Event* b)
{
return a->time.time_of_day() <= b->time.time_of_day();
}
User::~User()
{
for (unsigned i = 0; i < events.size(); i++) {
free(events.at(i));
}
}
void User::add_event(Event* event)
{
assert(event->user_id == get_id());
Event* new_event = (Event*)malloc(sizeof(Event));
new_event->user_id = get_id();
new_event->antenna_id = event->antenna_id;
new_event->time = event->time;
// Keep in sorted order
vector<Event*>::iterator pos = std::upper_bound(events.begin(),
events.end(), new_event, earlier_event_time);
events.insert(pos, new_event);
last_event = new_event;
}
AntennaId User::get_smoothed_antenna(time_duration time)
{
unsigned next_event_minute = to_minutes(time);
float smoothed_lat = 0;
float smoothed_lon = 0;
float weight_sum = 0;
for(unsigned i = 0; i < events.size(); i++) {
Event* event = events.at(i);
unsigned event_minute = to_minutes(event->time.time_of_day());
Antenna* antenna = AntennaModel::find_antenna_by_id(event->antenna_id);
int diff = abs(event_minute - next_event_minute);
if (diff > 12 * 60) {
diff = 24 * 60 - diff;
}
float weight = pdf(normal(0, AntennaModel::timestep), diff);
weight_sum += weight;
smoothed_lat += weight * antenna->get_latitude();
smoothed_lon += weight * antenna->get_longitude();
}
smoothed_lat /= weight_sum;
smoothed_lon /= weight_sum;
return AntennaModel::find_nearest_antenna(smoothed_lat,
smoothed_lon)->get_id();
}
void User::next_likely_event(Event* after_event, Event* likely_event)
{
if (events.empty()) {
likely_event->antenna_id = -1;
return;
}
// Set User ID
likely_event->user_id = after_event->user_id;
// Set time
vector<Event*>::iterator ev = std::upper_bound(events.begin(), events.end(),
after_event, earlier_event_time);
bool add_day = false;
if (ev == events.end()) {
ev = events.begin();
add_day = true;
}
ptime next_time(after_event->time.date(), (*ev)->time.time_of_day());
// TODO: clean this up
if (to_minutes(next_time - after_event->time) < AntennaModel::timestep) {
if (++ev == events.end()) {
ev = events.begin();
add_day = true;
}
next_time = ptime(after_event->time.date(), (*ev)->time.time_of_day());
}
likely_event->time = next_time;
if (add_day) likely_event->time += date_duration(1);
// Set location = smoothed antenna
likely_event->antenna_id =
get_smoothed_antenna(likely_event->time.time_of_day());
}
void User::previous_event(Event* previous_event)
{
if (last_event) {
*previous_event = *last_event;
} else { // Error; only occurs the first time
previous_event->antenna_id = -1;
}
}