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// Copyright 2013, 2014 Peter Vasil, Tomo Krajina. All
// rights reserved. Use of this source code is governed
// by a BSD-style license that can be found in the
// LICENSE file.
package gpx
import (
"encoding/xml"
"fmt"
"strconv"
"strings"
)
type NullableFloat64 struct {
data float64
notNull bool
}
func (n *NullableFloat64) Null() bool {
return !n.notNull
}
func (n *NullableFloat64) NotNull() bool {
return n.notNull
}
func (n *NullableFloat64) Value() float64 {
return n.data
}
func (n *NullableFloat64) SetValue(data float64) {
n.data = data
n.notNull = true
}
func (n *NullableFloat64) SetNull() {
var defaultValue float64
n.data = defaultValue
n.notNull = false
}
func NewNullableFloat64(data float64) *NullableFloat64 {
result := new(NullableFloat64)
result.data = data
result.notNull = true
return result
}
func (n *NullableFloat64) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
t, err := d.Token()
if err != nil {
n.SetNull()
return nil
}
if charData, ok := t.(xml.CharData); ok {
strData := strings.Trim(string(charData), " ")
value, err := strconv.ParseFloat(strData, 64)
if err != nil {
n.SetNull()
return nil
}
n.SetValue(value)
}
d.Skip()
return nil
}
func (n *NullableFloat64) UnmarshalXMLAttr(attr xml.Attr) error {
strData := strings.Trim(string(attr.Value), " ")
value, err := strconv.ParseFloat(strData, 64)
if err != nil {
n.SetNull()
return nil
}
n.SetValue(value)
return nil
}
func (n NullableFloat64) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
if n.Null() {
return nil
}
xmlName := xml.Name{Local: start.Name.Local}
e.EncodeToken(xml.StartElement{Name: xmlName})
e.EncodeToken(xml.CharData([]byte(fmt.Sprintf("%g", n.Value()))))
e.EncodeToken(xml.EndElement{Name: xmlName})
return nil
}
func (n NullableFloat64) MarshalXMLAttr(name xml.Name) (xml.Attr, error) {
var result xml.Attr
if n.Null() {
return result, nil
}
return xml.Attr{
Name: xml.Name{Local: name.Local},
Value: fmt.Sprintf("%g", n.Value())},
nil
}
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