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loader.go
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/
loader.go
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package loader
import (
"errors"
)
var (
ErrConfigIDKeyNotFound = errors.New("Config ID key is not found.")
ErrConfigIDExists = errors.New("Config ID already exists.")
ErrUnknownConfigID = errors.New("Unknown config ID.")
)
type ConfigCreator func() interface{}
type ConfigLoader interface {
RegisterCreator(string, ConfigCreator) error
CreateConfig(string) (interface{}, error)
Load([]byte) (interface{}, error)
LoadWithID([]byte, string) (interface{}, error)
}
type BaseConfigLoader struct {
creators map[string]ConfigCreator
}
func NewBaseConfigLoader() *BaseConfigLoader {
return &BaseConfigLoader{
creators: make(map[string]ConfigCreator),
}
}
func (this *BaseConfigLoader) RegisterCreator(id string, creator ConfigCreator) error {
if _, found := this.creators[id]; found {
return ErrConfigIDExists
}
this.creators[id] = creator
return nil
}
func (this *BaseConfigLoader) CreateConfig(id string) (interface{}, error) {
creator, found := this.creators[id]
if !found {
return nil, ErrUnknownConfigID
}
return creator(), nil
}