Add transformerconfig package and default configs

pkg/transformerconfig/pathconfig.go

@@ -0,0 +1,46 @@
+/*
+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 transformerconfig
+
+import (
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"strings"
+)
+
+// PathConfig contains the configuration of a field, including the gvk it ties to,
+// path to the field, etc.
+type PathConfig struct {
+	Group              string `json:"group,omitempty" yaml:"group,omitempty"`
+	Version            string `json:"version,omitempty" yaml:"version,omitempty"`
+	Kind               string `json:"kind,omitempty" yaml:"kind,omitempty"`
+	Path               string `json:"path,omitempty" yaml:"path,omitempty"`
+	CreateIfNotPresent bool   `json:"create,omitempty" yaml:"create,omitempty"`
+}
+
+// Gvk returns GroupVersionKind of the pathConfig
+func (p PathConfig) Gvk() *schema.GroupVersionKind {
+	return &schema.GroupVersionKind{
+		Group:   p.Group,
+		Version: p.Version,
+		Kind:    p.Kind,
+	}
+}
+
+// PathSlice converts the path string to a slice of strings, separated by "/"
+func (p PathConfig) PathSlice() []string {
+	return strings.Split(p.Path, "/")
+}