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package persistence
import (
"reflect"
"github.com/kataras/iris/mvc/activator/field"
)
// Controller is responsible to load from the original
// end-developer's main controller's value
// and re-store the persistence data by scanning the original.
// It stores and sets to each new controller
// the optional data that should be shared among all requests.
type Controller struct {
fields []field.Field
}
// Load scans and load for persistence data based on the `iris:"persistence"` tag.
//
// The type is the controller's Type.
// the "val" is the original end-developer's controller's Value.
// Returns nil if no persistence data to store found.
func Load(typ reflect.Type, val reflect.Value) *Controller {
matcher := func(elemField reflect.StructField) bool {
if tag, ok := elemField.Tag.Lookup("iris"); ok {
if tag == "persistence" {
return true
}
}
return false
}
handler := func(f *field.Field) {
valF := val.Field(f.Index)
if valF.IsValid() || (valF.Kind() == reflect.Ptr && !valF.IsNil()) {
val := reflect.ValueOf(valF.Interface())
if val.IsValid() || (val.Kind() == reflect.Ptr && !val.IsNil()) {
f.Value = val
}
}
}
fields := field.LookupFields(typ.Elem(), matcher, handler)
if len(fields) == 0 {
return nil
}
return &Controller{
fields: fields,
}
}
// Handle re-stores the persistence data at the current controller.
func (pc *Controller) Handle(c reflect.Value) {
elem := c.Elem() // controller should always be a pointer at this state
for _, f := range pc.fields {
f.SendTo(elem)
}
}
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