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meta.go
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meta.go
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package meta
import (
"errors"
"fmt"
"reflect"
)
//Group a group is consists of multiple Meta with the same name
type Group []*Meta
type Meta struct {
qualifyName string
properties map[string]any
}
func New(qualifyName string) *Meta {
return &Meta{
qualifyName: qualifyName,
properties: map[string]any{},
}
}
func (m *Meta) QualifyName() string {
return m.qualifyName
}
func (m *Meta) Property(key string) any {
return m.properties[key]
}
func (m *Meta) SetProperty(key, value string) *Meta {
m.properties[key] = value
return m
}
func (m *Meta) Properties() map[string]any {
return m.properties
}
func (m *Meta) SetProperties(properties map[string]any) *Meta {
for k, v := range properties {
m.properties[k] = v
}
return m
}
func (m *Meta) MapTo(obj any) error {
objPointerType := reflect.TypeOf(obj)
if objPointerType.Kind() != reflect.Pointer {
return errors.New("MapStruct param must be a Pointer")
}
objType := objPointerType.Elem()
objPointerValue := reflect.ValueOf(obj)
objValue := reflect.Indirect(objPointerValue)
for i := 0; i < objValue.NumField(); i++ {
field := objType.Field(i)
val, ok := m.properties[field.Name]
if !ok {
continue
}
fieldValue := objValue.Field(i)
err := setValue(fieldValue, val)
if err != nil {
return err
}
}
return nil
}
func setValue(v reflect.Value, val any) error {
switch v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
intVal, ok := val.(int64)
if !ok {
return fmt.Errorf("expect int value, but not: value=%v", val)
}
if v.OverflowInt(intVal) {
return fmt.Errorf("int value too big: %d", intVal)
}
v.SetInt(intVal)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
intVal, ok := val.(int64)
if !ok {
return fmt.Errorf("expect int value, but not: value=%v", val)
}
if v.OverflowUint(uint64(intVal)) {
return fmt.Errorf("int value too big: %d", intVal)
}
v.SetUint(uint64(intVal))
case reflect.Float32, reflect.Float64:
floatVal, ok := val.(float64)
if !ok {
return fmt.Errorf("expect float value, but not: value=%v", val)
}
if v.OverflowFloat(floatVal) {
return fmt.Errorf("float value too big: %f", floatVal)
}
v.SetFloat(floatVal)
case reflect.String:
strVal, ok := val.(string)
if !ok {
return fmt.Errorf("expect string value, but not: value=%v", val)
}
v.SetString(strVal)
case reflect.Bool:
boolVal, ok := val.(bool)
if !ok {
return fmt.Errorf("expect bool value, but not: value=%v", val)
}
v.SetBool(boolVal)
default:
return errors.New("Unsupported kind: " + v.Kind().String())
}
return nil
}