package main
import (
"fmt"
"reflect"
)
func main() {
var x uint8 = 'x'
v := reflect.ValueOf(x)
fmt.Println("type:", v.Type()) // uint8.
fmt.Println("kind is uint8: ", v.Kind() == reflect.Uint8) // true.
x = uint8(v.Uint()) // v.Uint returns a uint64.
}
y := v.Interface().(float64) // y will have type float64.
fmt.Println(y)
func (inj *injector) Invoke(f interface{}) ([]reflect.Value, error) {
t := reflect.TypeOf(f)
var in = make([]reflect.Value, t.NumIn()) //Panic if t is not kind of Func
for i := 0; i < t.NumIn(); i++ {
argType := t.In(i)
val := inj.Get(argType)
if !val.IsValid() {
return nil, fmt.Errorf("Value not found for type %v", argType)
}
in[i] = val
}
return reflect.ValueOf(f).Call(in), nil
}
inject
func (inj *injector) Apply(val interface{}) error {
v := reflect.ValueOf(val)
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
if v.Kind() != reflect.Struct {
return nil
}
t := v.Type()
for i := 0; i < v.NumField(); i++ {
f := v.Field(i)
structField := t.Field(i)
if f.CanSet() && structField.Tag == "inject" {
ft := f.Type()
v := inj.Get(ft)
if !v.IsValid() {
return fmt.Errorf("Value not found for type %v", ft)
}
f.Set(v)
}
}
return nil
}
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