package resource

import (
  "fmt"
)

var (
  ResourceTypes *Types = NewTypes()
)

type TypeFactory func() Resource

type Types struct {
  registry map[string]TypeFactory
}

func NewTypes() *Types {
  return &Types{ registry: make(map[string]TypeFactory) }
}

func (t *Types) Register(name string, factory TypeFactory) {
  t.registry[name] = factory
}

func (t *Types) New(name string) (Resource, error) {
  if r,ok := t.registry[name]; ok {
    return r(), nil
  }
  return nil, fmt.Errorf("Unknown type: %s", name)
}