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registration.go
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registration.go
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package registry
import (
"fmt"
"reflect"
)
func Register(reg Registry, v Registrable, s Serializer, d Deserializer, os []BuildOption) error {
var key string
t := reflect.TypeOf(v)
switch {
// accept: (*T)(nil)
case t.Kind() == reflect.Ptr && reflect.ValueOf(v).IsNil():
key = reflect.New(t).Interface().(Registrable).Key()
// accept: *T{}, T{}
default:
key = v.Key()
}
return RegisterKey(reg, key, v, s, d, os)
}
func RegisterKey(reg Registry, key string, v interface{}, s Serializer, d Deserializer, os []BuildOption) error {
t := reflect.TypeOf(v)
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
return reg.register(key, func() interface{} {
return reflect.New(t).Interface()
}, s, d, os)
}
func RegisterFactory(reg Registry, key string, fn func() interface{}, s Serializer, d Deserializer,
os []BuildOption,
) error {
if v := fn(); v == nil {
return fmt.Errorf("factory for item `%s` returns a nil value", key)
}
if t := reflect.TypeOf(fn()); t.Kind() != reflect.Ptr {
return fmt.Errorf("factory for item `%s` does not return a pointer receiver", key)
}
return reg.register(key, fn, s, d, os)
}