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parser.go
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parser.go
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package brc
import (
"bufio"
"fmt"
"github.com/emirpasic/gods/maps/treemap"
"io"
"strconv"
"strings"
)
type StationTemperatureStatistics struct {
minTemperature float64
maxTemperature float64
aggregateTemperature float64
totalEntries uint64
averageTemperature float64
}
func (statistic StationTemperatureStatistics) Stringify(stationName string) string {
return fmt.Sprintf("%s:%v/%v/%v", stationName, statistic.minTemperature, statistic.averageTemperature, statistic.maxTemperature)
}
type StationTemperatureStatisticsResult struct {
statisticsByStationName *treemap.Map
}
func NewStationTemperatureStatisticsResult(statisticsByStationName *treemap.Map) StationTemperatureStatisticsResult {
return StationTemperatureStatisticsResult{
statisticsByStationName: statisticsByStationName,
}
}
func (result StationTemperatureStatisticsResult) MinTemperatureOf(stationName string) float64 {
v, ok := result.statisticsByStationName.Get(stationName)
if !ok {
return 0.0
}
return v.(StationTemperatureStatistics).minTemperature
}
func (result StationTemperatureStatisticsResult) MaxTemperatureOf(stationName string) float64 {
v, ok := result.statisticsByStationName.Get(stationName)
if !ok {
return 0.0
}
return v.(StationTemperatureStatistics).maxTemperature
}
func (result StationTemperatureStatisticsResult) AverageTemperatureOf(stationName string) float64 {
v, ok := result.statisticsByStationName.Get(stationName)
if !ok {
return 0.0
}
return v.(StationTemperatureStatistics).averageTemperature
}
func (result StationTemperatureStatisticsResult) AllStationsSorted() []interface{} {
return result.statisticsByStationName.Keys()
}
func (result StationTemperatureStatisticsResult) Iterator() treemap.Iterator {
return result.statisticsByStationName.Iterator()
}
// Parse
// TODO: rounding
func Parse(reader io.Reader) (StationTemperatureStatisticsResult, error) {
scanner := bufio.NewScanner(reader)
statisticsByStationName := treemap.NewWithStringComparator()
for scanner.Scan() {
line := scanner.Text()
stationName, temperature, err := temperatureByStationName(line)
if err != nil {
if err == io.EOF {
return NewStationTemperatureStatisticsResult(statisticsByStationName), nil
}
return StationTemperatureStatisticsResult{}, err
}
stats, ok := statisticsByStationName.Get(stationName)
if !ok {
statisticsByStationName.Put(stationName, StationTemperatureStatistics{
minTemperature: temperature,
maxTemperature: temperature,
aggregateTemperature: temperature,
totalEntries: 1,
averageTemperature: temperature,
})
} else {
existingStatistics := stats.(StationTemperatureStatistics)
minTemperature, maxTemperature := existingStatistics.minTemperature, existingStatistics.maxTemperature
if temperature < existingStatistics.minTemperature {
minTemperature = temperature
}
if temperature > existingStatistics.maxTemperature {
maxTemperature = temperature
}
statisticsByStationName.Put(stationName, StationTemperatureStatistics{
minTemperature: minTemperature,
maxTemperature: maxTemperature,
aggregateTemperature: temperature + existingStatistics.aggregateTemperature,
totalEntries: existingStatistics.totalEntries + 1,
averageTemperature: (temperature + existingStatistics.aggregateTemperature) / float64(existingStatistics.totalEntries+1),
})
}
}
return NewStationTemperatureStatisticsResult(statisticsByStationName), nil
}
func temperatureByStationName(line string) (string, float64, error) {
parts := strings.Split(line, ";")
temperature, err := strconv.ParseFloat(parts[1], 64)
if err != nil {
return "", 0, err
}
return parts[0], temperature, nil
}