make loader, transformer as interfaces

pkg/loader/loader.go

@@ -0,0 +1,23 @@
+/*
+Copyright 2016 Skippbox, Ltd All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package loader
+
+import "github.com/skippbox/kompose/pkg/kobject"
+
+type Loader interface {
+	LoadFile(file string) kobject.KomposeObject
+}