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package custom
import "errors"
// Registry is a store of EntityCRUD objects
type Registry interface {
// Register puts EntityCRUD in the internal
// store and returns an error if the entity
// of Type is already registered
Register(Type, EntityCRUD) error
// Lookup returns the EntityCRUD object associated
// with typ, or nil if one is not Registered yet.
Lookup(Type) EntityCRUD
// Unregister unregisters the entity
// registered with Type from the store.
// It returns an
// error if the Type was not registered
// before this call.
Unregister(Type) error
}
// defaultRegistry is an out of the box implementation
// of Registry object.
type defaultRegistry struct {
store map[Type]EntityCRUD
}
// NewDefaultRegistry returns a default registry
func NewDefaultRegistry() Registry {
return &defaultRegistry{
store: make(map[Type]EntityCRUD),
}
}
// Register puts EntityCRUD in the internal
// store and returns an error if the entity
// of Type is already registered.
func (r *defaultRegistry) Register(typ Type, def EntityCRUD) error {
if _, ok := r.store[typ]; ok {
return errors.New("type already registered")
}
r.store[typ] = def
return nil
}
// Lookup returns the EntityCRUD object associated
// with typ, or nil if one is not Registered yet.
func (r *defaultRegistry) Lookup(typ Type) EntityCRUD {
return r.store[typ]
}
// Unregister unregisters the entity
// registered with Type from the store.
// It returns an
// error if the Type was not registered
// before this call.
func (r *defaultRegistry) Unregister(typ Type) error {
if _, ok := r.store[typ]; !ok {
return errors.New("type not registered")
}
delete(r.store, typ)
return nil
}
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