[#231] object: Implement string encode/decode methods on Type

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/object/type.go

@@ -33,3 +33,14 @@ func TypeFromV2(t object.Type) Type {
 		return TypeRegular
 	}
 }
+
+func (t Type) String() string {
+	return t.ToV2().String()
+}
+
+// TypeFromString parses Type from its string representation.
+func TypeFromString(s string) Type {
+	return TypeFromV2(
+		object.TypeFromString(s),
+	)
+}

pkg/object/type_test.go

@@ -34,3 +34,13 @@ func TestType_ToV2(t *testing.T) {
 		require.Equal(t, item.t, TypeFromV2(item.t2))
 	}
 }
+
+func TestType_String(t *testing.T) {
+	for _, typ := range []Type{
+		TypeRegular,
+		TypeTombstone,
+		TypeStorageGroup,
+	} {
+		require.Equal(t, typ, TypeFromString(typ.String()))
+	}
+}

v2/object/string.go

@@ -0,0 +1,29 @@
+package object
+
+const (
+	typeRegularString      = "Regular"
+	typeTombstoneString    = "Tombstone"
+	typeStorageGroupString = "StorageGroup"
+)
+
+func (t Type) String() string {
+	switch t {
+	default:
+		return typeRegularString
+	case TypeTombstone:
+		return typeTombstoneString
+	case TypeStorageGroup:
+		return typeStorageGroupString
+	}
+}
+
+func TypeFromString(s string) Type {
+	switch s {
+	default:
+		return TypeRegular
+	case typeTombstoneString:
+		return TypeTombstone
+	case typeStorageGroupString:
+		return TypeStorageGroup
+	}
+}