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span.go
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span.go
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package tnglib
import (
"encoding/json"
"time"
)
// Span stores duration for json decode/encode
type Span struct {
time.Duration
}
// TimeSpan convert duration to Span
func TimeSpan(d time.Duration) Span {
return Span{Duration: d}
}
// MustTimeSpan convert string to Span
func MustTimeSpan(s string) Span {
dur, err := time.ParseDuration(s)
if err != nil {
panic(err)
}
return Span{Duration: dur}
}
// IsZero return true if duration is zero
func (d Span) IsZero() bool {
return d.Duration == 0
}
// IsNegative return true if duration is less than 0
func (d Span) IsNegative() bool {
return d.Duration < 0
}
// IsPositive return true if duration is greater than 0
func (d Span) IsPositive() bool {
return d.Duration > 0
}
// MarshalJSON converts duration to string
func (d Span) MarshalJSON() ([]byte, error) {
return json.Marshal(d.String())
}
// UnmarshalJSON convert duration stream to time.Duration
func (d *Span) UnmarshalJSON(data []byte) error {
// Try unmarshal to number
var fv float64
if err := json.Unmarshal(data, &fv); err == nil {
d.Duration = time.Duration(fv)
return nil
}
// Try unmarshal to string
var sv string
if err := json.Unmarshal(data, &sv); err != nil {
return err
}
dur, err := time.ParseDuration(sv)
if err != nil {
return err
}
d.Duration = dur
return nil
}