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util.go
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util.go
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package driver
import (
"reflect"
"time"
)
var (
timeType = reflect.TypeOf(time.Time{})
)
func IsZero(val reflect.Value) bool {
switch val.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return val.Len() == 0
case reflect.Bool:
return !val.Bool()
case reflect.Complex64, reflect.Complex128:
return val.Complex() == 0
case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface:
return val.IsNil()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return val.Int() == 0
case reflect.Float32, reflect.Float64:
return val.Float() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return val.Uint() == 0
case reflect.Struct:
if val.Type() == timeType {
return val.Interface().(time.Time).IsZero()
}
return false
}
return true
}
// Direct descends into val.Elem() as long as
// val.Type().Kind() is reflect.Ptr and returns
// the result.
func Direct(val reflect.Value) reflect.Value {
for val.Kind() == reflect.Ptr {
val = val.Elem()
}
return val
}