Merge pull request #244 from mengqiy/multitransformer

add a constructor for multitransformer

pkg/kinflate/transformers/default.go

@@ -56,5 +56,5 @@ func DefaultTransformer(m *manifest.Manifest) (Transformer, error) {
 	if nrt != nil {
 		transformers = append(transformers, nrt)
 	}
-	return &MultiTransformer{transformers}, nil
+	return NewMultiTransformer(transformers), nil
 }

pkg/kinflate/transformers/multitransformer.go

@@ -23,14 +23,22 @@ import (
 
 // MultiTransformer contains a list of transformers.
 type MultiTransformer struct {
-	Transformers []Transformer
+	transformers []Transformer
 }
 
 var _ Transformer = &MultiTransformer{}
 
+// NewMultiTransformer constructs a MultiTransformer.
+func NewMultiTransformer(t []Transformer) Transformer {
+	r := &MultiTransformer{
+		transformers: make([]Transformer, len(t))}
+	copy(r.transformers, t)
+	return r
+}
+
 // Transform prepends the name prefix.
 func (o *MultiTransformer) Transform(m map[gvkn.GroupVersionKindName]*unstructured.Unstructured) error {
-	for _, t := range o.Transformers {
+	for _, t := range o.transformers {
 		err := t.Transform(m)
 		if err != nil {
 			return err