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visibility.go
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visibility.go
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package meta
import (
"sort"
"strings"
"time"
)
const (
visibilityCode = iota
visibilitySkyVisibility
visibilityStartTime
visibilityEndTime
visibilityLast
)
var visibilityHeaders Header = map[string]int{
"Code": visibilityCode,
"Sky Visibility": visibilitySkyVisibility,
"Start Date": visibilityStartTime,
"End Date": visibilityEndTime,
}
type Visibility struct {
Span
Code string
SkyVisibility string
}
type VisibilityList []Visibility
func (v VisibilityList) Len() int { return len(v) }
func (v VisibilityList) Swap(i, j int) { v[i], v[j] = v[j], v[i] }
func (v VisibilityList) Less(i, j int) bool {
switch {
case v[i].Code < v[j].Code:
return true
case v[i].Code > v[j].Code:
return false
default:
return v[i].Start.Before(v[j].Start)
}
}
func (v VisibilityList) encode() [][]string {
var data [][]string
data = append(data, visibilityHeaders.Columns())
for _, row := range v {
data = append(data, []string{
strings.TrimSpace(row.Code),
strings.TrimSpace(row.SkyVisibility),
row.Start.Format(DateTimeFormat),
row.End.Format(DateTimeFormat),
})
}
return data
}
func (v *VisibilityList) decode(data [][]string) error {
if !(len(data) > 1) {
return nil
}
var visibilities []Visibility
fields := visibilityHeaders.Fields(data[0])
for _, row := range data[1:] {
d := fields.Remap(row)
start, err := time.Parse(DateTimeFormat, d[visibilityStartTime])
if err != nil {
return err
}
end, err := time.Parse(DateTimeFormat, d[visibilityEndTime])
if err != nil {
return err
}
visibilities = append(visibilities, Visibility{
Code: strings.TrimSpace(d[visibilityCode]),
SkyVisibility: strings.TrimSpace(d[visibilitySkyVisibility]),
Span: Span{
Start: start,
End: end,
},
})
}
*v = VisibilityList(visibilities)
return nil
}
func LoadVisibilities(path string) ([]Visibility, error) {
var v []Visibility
if err := LoadList(path, (*VisibilityList)(&v)); err != nil {
return nil, err
}
sort.Sort(VisibilityList(v))
return v, nil
}