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structupdater.go
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/
structupdater.go
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package fet
import (
"errors"
"reflect"
)
var (
ErrNilStruct = errors.New("fet: nil pointer passed to Struct")
ErrNotStruct = errors.New("fet: non-struct passed to Struct")
ErrInvalidField = errors.New("fet: invalid field")
)
// StructUpdater is and updater for struct
type StructUpdater struct {
v reflect.Value
t reflect.Type
m M
}
// Pick picks the given field from struct with the given checkers.
// if the struct field has `bson` tag, otherwise use fieldname
// Example:
// fet.Struct(user).Pick("firstname").Pick("lastname")
func (s *StructUpdater) Pick(name string, checkers ...Checker) *StructUpdater {
vf := s.v.FieldByName(name)
f, ok := s.t.FieldByName(name)
if !ok {
return s
}
val := vf.Interface()
key := getKeyFromField(f, name)
if !checkFilter(key, val, checkers...) {
return s
}
s.m[key] = val
return s
}
// PickAll picks all the fields from the given struct.
// use given checkers to all fields.
func (s *StructUpdater) PickAll(checkers ...Checker) *StructUpdater {
for i := 0; i < s.t.NumField(); i++ {
s.Pick(s.t.Field(i).Name, checkers...)
}
return s
}
func (s *StructUpdater) Update(m M) {
for k, v := range s.m {
m[k] = v
}
}
func (s *StructUpdater) Build() M {
return Build(s)
}
// Struct constructs a StructUpdater for the given struct.
// if given value is nil or not a struct, panic.
func Struct(s interface{}) *StructUpdater {
v := reflect.ValueOf(s)
t := reflect.TypeOf(s)
if s == nil {
panic(ErrNilStruct)
}
kind := v.Kind()
if kind == reflect.Ptr {
return Struct(v.Elem().Interface())
}
if kind != reflect.Ptr && kind != reflect.Struct {
panic(ErrNotStruct)
}
return &StructUpdater{
v: v,
t: t,
m: M{},
}
}