add to from string

db.go

@@ -1,5 +1,7 @@
 package storage
 
+import "strings"
+
 type DB interface {
 	Get(string) ([]byte, error)
 	Set(string, []byte) error
@@ -7,3 +9,50 @@ type DB interface {
 }
 
 var DefaultNamespace = "namespace"
+
+type Type int
+
+const (
+	MAP             = Type(iota)
+	BOLT            = Type(iota)
+	CACHE           = Type(iota)
+	LEVELDB         = Type(iota)
+	MEMCACHE        = Type(iota)
+	MEMCACHECLUSTER = Type(iota)
+	MONGO           = Type(iota)
+)
+
+func (t Type) String() string {
+	switch t {
+	case MAP:
+		return "map"
+	case BOLT:
+		return "bolt"
+	case CACHE:
+		return "cache"
+	case LEVELDB:
+		return "leveldb"
+	case MEMCACHE:
+		return "memcache"
+	case MEMCACHECLUSTER:
+		return "memcachecluster"
+	case MONGO:
+		return "mongo"
+	}
+	return "<unknown>"
+}
+
+func TypeFromString(key string) Type {
+	key = strings.ToLower(key)
+	for i := 0; i < 30; i++ {
+		t := Type(i)
+		if t.String() == key {
+			return t
+		}
+	}
+	return Type(-1)
+}
+
+func New(key Type) (DB, error) {
+	return nil, ErrNotImpl
+}