Introduce ResId and ResMap.

pkg/resmap/idslice.go

@@ -0,0 +1,37 @@
+/*
+Copyright 2018 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.
+*/
+
+package resmap
+
+import (
+	"sort"
+
+	"github.com/kubernetes-sigs/kustomize/pkg/resource"
+)
+
+// IdSlice implements the sort interface.
+type IdSlice []resource.ResId
+
+var _ sort.Interface = IdSlice{}
+
+func (a IdSlice) Len() int      { return len(a) }
+func (a IdSlice) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
+func (a IdSlice) Less(i, j int) bool {
+	if a[i].Gvk().String() != a[j].Gvk().String() {
+		return a[i].Gvk().String() < a[j].Gvk().String()
+	}
+	return a[i].Name() < a[j].Name()
+}