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Add getFunctionByInterface #16

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Add getFunctionByInterface #16

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23 changes: 23 additions & 0 deletions filler.go
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,7 @@ func (f *Filler) SetDefaultValue(field *FieldData) {
f.getFunctionByName,
f.getFunctionByType,
f.getFunctionByKind,
f.getFunctionByInterface,
}

for _, getter := range getters {
Expand Down Expand Up @@ -133,6 +134,28 @@ func (f *Filler) getFunctionByKind(field *FieldData) FillerFunc {
return nil
}

func (f *Filler) getFunctionByInterface(field *FieldData) FillerFunc {
if !field.Field.Type.Implements(defaultsType) {
return nil
}
return func(field *FieldData) {
if !field.Value.CanInterface() {
return
}
asDefaults, ok := field.Value.Interface().(Defaults)
if !ok {
return
}
field.Value.Set(reflect.ValueOf(asDefaults.Defaults(field.TagValue)))
}
}

var defaultsType = reflect.TypeOf((*Defaults)(nil)).Elem()

type Defaults interface {
Defaults(tagValue string) interface{}
}

// TypeHash is a string representing a reflect.Type following the next pattern:
// <package.name>.<type.name>
type TypeHash string
Expand Down