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option.go
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option.go
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package gtly
import (
"fmt"
"github.com/viant/toolbox"
"reflect"
)
//Option represents Field option
type Option func(field *Field)
//DateLayoutOpt Field with data layout option
func DateLayoutOpt(layout string) Option {
return func(field *Field) {
field.DataLayout = layout
}
}
//ProviderOpt return a Field provider option
func ProviderOpt(provider *Provider) Option {
return func(field *Field) {
field.provider = provider
}
}
//OmitEmptyOpt returns a Field omit empty option
func OmitEmptyOpt(omitEmpty bool) Option {
return func(field *Field) {
field.OmitEmpty = &omitEmpty
}
}
//ComponentTypeOpt return a Field component type option
func ComponentTypeOpt(componentType string) Option {
return func(field *Field) {
field.ComponentType = componentType
}
}
//ValueOpt derives type from supplied value
func ValueOpt(value interface{}) (Option, error) {
if value == nil {
return nil, fmt.Errorf("value was empty")
}
switch val := value.(type) {
case *Object:
return func(field *Field) {
field.DataType = FieldTypeObject
field.provider = &Provider{Proto: val.Proto()}
}, nil
case *Array:
return func(field *Field) {
field.DataType = FieldTypeArray
field.provider = &Provider{Proto: val.Proto()}
}, nil
case *Map:
return func(field *Field) {
field.DataType = FieldTypeArray
field.provider = &Provider{Proto: val.Proto()}
}, nil
case *Multimap:
return func(field *Field) {
field.DataType = FieldTypeArray
field.provider = &Provider{Proto: val.Proto()}
}, nil
default:
typeName := typeNameForValue(value)
if typeName != "" {
rType := getBaseType(typeName)
return func(field *Field) {
if field.Type == nil {
field.Type = rType
}
if field.DataType == "" {
field.DataType = typeName
}
}, nil
}
if toolbox.IsMap(value) || toolbox.IsStruct(value) {
fields, err := MapFields(value)
if err != nil {
return nil, err
}
provider, err := NewProvider("", fields...)
if err != nil {
return nil, err
}
return func(field *Field) {
provider.Name = field.Name
field.provider = provider
field.Type = provider.dataType
}, nil
}
if toolbox.IsSlice(value) {
componentType := toolbox.DiscoverComponentType(value)
typeName := typeNameForType(componentType)
if typeName != "" {
rType := getBaseType(typeName)
return func(field *Field) {
field.Type = reflect.SliceOf(rType)
field.DataType = FieldTypeArray
}, nil
}
fields, err := MapFields(reflect.New(componentType).Interface())
if err != nil {
return nil, err
}
provider, err := NewProvider("", fields...)
if err != nil {
return nil, err
}
return func(field *Field) {
field.Type = provider.Type()
field.DataType = FieldTypeArray
}, nil
}
}
return nil, fmt.Errorf("unsupported type %T", value)
}