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|
package main
import (
"encoding/csv"
"os"
"strconv"
"strings"
)
type ZipcodeDetails struct {
Latitude float64 `json:"latitude"`
Longitude float64 `json:"longitude"`
City string `json:"city"`
State string `json:"state"`
}
type ZipcodeDatabase struct {
Zipcodes map[string]*ZipcodeDetails
}
func NewZipcodeDatabase() *ZipcodeDatabase {
db := &ZipcodeDatabase{}
db.Zipcodes = make(map[string]*ZipcodeDetails)
return db
}
func (db *ZipcodeDatabase) Insert(zipcode string, details *ZipcodeDetails) {
db.Zipcodes[zipcode] = details
}
func (db *ZipcodeDatabase) Find(zipcode string) *ZipcodeDetails {
return db.Zipcodes[zipcode]
}
func (db *ZipcodeDatabase) LoadFromCSV(filename string) error {
zips, err := getZipsFromFile(filename)
if err != nil {
return err
}
for _, row := range zips {
details, err := getDetailsFromRow(row)
if err != nil {
return err
}
db.Insert(row[0], details)
}
return nil
}
func getZipsFromFile(filename string) ([][]string, error) {
reader, err := os.Open(filename)
if err != nil {
return nil, err
}
defer reader.Close()
csvReader := csv.NewReader(reader)
zips, err := csvReader.ReadAll()
if err != nil {
return nil, err
}
return zips, nil
}
func getDetailsFromRow(row []string) (*ZipcodeDetails, error) {
lat, err := strconv.ParseFloat(strings.TrimSpace(row[2]), 64)
if err != nil {
return nil, err
}
lon, err := strconv.ParseFloat(strings.TrimSpace(row[3]), 64)
if err != nil {
return nil, err
}
zip := &ZipcodeDetails{
State: row[1],
Latitude: lat,
Longitude: lon,
City: row[4],
}
return zip, nil
}
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