move ref.go to its own subpackage

pkg/api/objectreference.go

@@ -0,0 +1,34 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+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.
+*/
+
+//TODO: consider making these methods functions, because we don't want helper
+//functions in the k8s.io/api repo.
+
+package api
+
+import (
+	"k8s.io/apimachinery/pkg/runtime/schema"
+)
+
+func (obj *ObjectReference) SetGroupVersionKind(gvk schema.GroupVersionKind) {
+	obj.APIVersion, obj.Kind = gvk.ToAPIVersionAndKind()
+}
+
+func (obj *ObjectReference) GroupVersionKind() schema.GroupVersionKind {
+	return schema.FromAPIVersionAndKind(obj.APIVersion, obj.Kind)
+}
+
+func (obj *ObjectReference) GetObjectKind() schema.ObjectKind { return obj }