forked from guregu/null
/
int.go
194 lines (176 loc) · 4.16 KB
/
int.go
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package null
import (
"bytes"
"database/sql"
"encoding/json"
"strconv"
"unsafe"
"github.com/mailru/easyjson/jlexer"
"github.com/mailru/easyjson/jwriter"
)
// Int is an nullable int64.
// It does not consider zero values to be null.
// It will decode to null, not zero, if null.
type Int struct {
sql.NullInt64
}
// NewInt creates a new Int
func NewInt(i int64, valid bool) Int {
return Int{
NullInt64: sql.NullInt64{
Int64: i,
Valid: valid,
},
}
}
// IntFrom creates a new Int that will always be valid.
func IntFrom(i int64) Int {
return NewInt(i, true)
}
// IntFromPtr creates a new Int that be null if i is nil.
func IntFromPtr(i *int64) Int {
if i == nil {
return NewInt(0, false)
}
return NewInt(*i, true)
}
type basicInt Int
type stringInt struct {
Int64 string
Valid bool
}
// UnmarshalJSON implements json.Unmarshaler.
// It supports number and null input.
// 0 will not be considered a null Int.
// It also supports unmarshalling a sql.NullInt64.
func (i *Int) UnmarshalJSON(data []byte) error {
var err error
// Golden path is being passed a integer or null
if bytes.Compare(data, []byte("null")) == 0 {
i.Valid = false
return nil
}
// BQ sends numbers as strings. We can strip quotes on simple strings
if data[0] == '"' {
data = bytes.Trim(data, `"`)
}
if data[0] == '{' {
// We've been sent a structure. This is not our main-line as we encode
// to a simple int
var ii basicInt
err = json.Unmarshal(data, &ii)
if err != nil {
// Try a string version
var si stringInt
err = json.Unmarshal(data, &si)
if err == nil {
i.Valid = si.Valid
if si.Valid {
i.Int64, err = strconv.ParseInt(si.Int64, 10, 64)
i.Valid = (err == nil)
}
}
} else {
*i = Int(ii)
}
} else {
i.Int64, err = strconv.ParseInt(*(*string)(unsafe.Pointer(&data)), 10, 64)
i.Valid = (err == nil)
}
return err
}
// UnmarshalEasyJSON is an easy-JSON specific decoder, that should be more efficient than the standard one.
func (i *Int) UnmarshalEasyJSON(w *jlexer.Lexer) {
if w.IsNull() {
w.Skip()
i.Valid = false
return
}
if w.IsDelim('{') {
w.Skip()
for !w.IsDelim('}') {
key := w.UnsafeString()
w.WantColon()
if w.IsNull() {
w.Skip()
w.WantComma()
continue
}
switch key {
case "int64", "Int64":
i.Int64 = w.Int64()
case "valid", "Valid":
i.Valid = w.Bool()
}
w.WantComma()
}
return
}
data := w.Raw()
if data[0] == '"' {
data = data[1 : len(data)-1]
}
ii, err := strconv.ParseInt(*(*string)(unsafe.Pointer(&data)), 10, 64)
if err != nil {
w.AddError(&jlexer.LexerError{
Reason: err.Error(),
Data: string(data),
})
}
i.Int64 = ii
i.Valid = (err == nil)
}
// UnmarshalText implements encoding.TextUnmarshaler.
// It will unmarshal to a null Int if the input is a blank or not an integer.
// It will return an error if the input is not an integer, blank, or "null".
func (i *Int) UnmarshalText(text []byte) error {
str := string(text)
if str == "" || str == "null" {
i.Valid = false
return nil
}
var err error
i.Int64, err = strconv.ParseInt(string(text), 10, 64)
i.Valid = err == nil
return err
}
// MarshalJSON implements json.Marshaler.
// It will encode null if this Int is null.
func (i Int) MarshalJSON() ([]byte, error) {
if !i.Valid {
return nullLiteral, nil
}
return []byte(strconv.FormatInt(i.Int64, 10)), nil
}
func (i Int) MarshalEasyJSON(w *jwriter.Writer) {
if !i.Valid {
w.RawString("null")
return
}
w.Int64(i.Int64)
}
// MarshalText implements encoding.TextMarshaler.
// It will encode a blank string if this Int is null.
func (i Int) MarshalText() ([]byte, error) {
if !i.Valid {
return []byte{}, nil
}
return []byte(strconv.FormatInt(i.Int64, 10)), nil
}
// SetValid changes this Int's value and also sets it to be non-null.
func (i *Int) SetValid(n int64) {
i.Int64 = n
i.Valid = true
}
// Ptr returns a pointer to this Int's value, or a nil pointer if this Int is null.
func (i Int) Ptr() *int64 {
if !i.Valid {
return nil
}
return &i.Int64
}
// IsZero returns true for invalid Ints, for future omitempty support (Go 1.4?)
// A non-null Int with a 0 value will not be considered zero.
func (i Int) IsZero() bool {
return !i.Valid
}