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bind.go
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bind.go
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package zdi
import (
"errors"
"fmt"
"reflect"
)
type (
Construct interface {
Apply(Pointer) error
Resolve(...Pointer) error
}
)
func (inj *injector) Resolve(v ...Pointer) error {
for _, p := range v {
r := reflect.ValueOf(p)
rt := r.Type()
v := r
t := rt
for v.Kind() == reflect.Ptr {
v = v.Elem()
t = rt.Elem()
}
if !v.IsValid() {
var val reflect.Value
var ok bool
val, ok = inj.Get(t)
if !ok {
return errors.New("can't find injector for " + t.String())
}
if !v.IsValid() && r.IsValid() {
if t.Kind() == reflect.Ptr {
r.Elem().Set(val)
continue
}
}
return errors.New("invalid pointer")
}
if !v.CanSet() {
return errors.New("cannot set value")
}
typ := v.Type()
val, ok := inj.Get(typ)
if !ok {
return errors.New("can't find injector for " + t.String())
}
v.Set(val)
}
return nil
}
func (inj *injector) Apply(p Pointer) error {
v := reflect.ValueOf(p)
for v.Kind() == reflect.Ptr {
v = v.Elem()
}
if !v.CanSet() {
return errors.New("cannot set value")
}
typ := v.Type()
val, ok := inj.Get(typ)
if ok {
v.Set(val)
return nil
}
if v.Kind() != reflect.Struct {
val, ok := inj.Get(typ)
if !ok {
return nil
}
v.Set(val)
return nil
}
for i := 0; i < v.NumField(); i++ {
f := v.Field(i)
structField := typ.Field(i)
_, ok := structField.Tag.Lookup("di")
if f.CanSet() && ok {
ft := f.Type()
v, ok := inj.Get(ft)
if !ok {
return fmt.Errorf("value not found for type %v", ft)
}
f.Set(v)
}
}
return nil
}