[incompatible change] enhance transformer interfaces

the interface methods ParameterTransformer.TransformParameters()
and ObjectTransformer.TransformObjects() now have two additional
parameters: namespace and name, which will be populated with
the return values of component.GetDeploymentNamespace() and
component.GetDeploymentName() - analogous to the generator.Generator()
case.

Author: cbarbian-sap

pkg/manifests/generator.go

@@ -46,7 +46,7 @@ func (g *tranformableGenerator) WithObjectTransformer(transformer ObjectTransfor
 
 func (g *tranformableGenerator) Generate(namespace string, name string, parameters types.Unstructurable) ([]client.Object, error) {
 	for i, transformer := range g.parameterTransformers {
-		_parameters, err := transformer.TransformParameters(parameters)
+		_parameters, err := transformer.TransformParameters(namespace, name, parameters)
 		if err != nil {
 			return nil, errors.Wrapf(err, "error calling parameter transformer (%d)", i)
 		}
@@ -57,7 +57,7 @@ func (g *tranformableGenerator) Generate(namespace string, name string, paramete
 		return nil, err
 	}
 	for i, transformer := range g.objectTransformers {
-		_objects, err := transformer.TransformObjects(objects)
+		_objects, err := transformer.TransformObjects(namespace, name, objects)
 		if err != nil {
 			return nil, errors.Wrapf(err, "error calling object transformer (%d)", i)
 		}

pkg/manifests/transformer.go

@@ -62,9 +62,12 @@ func NewTemplateParameterTransformer(fsys fs.FS, path string) (*TemplateParamete
 	return t, nil
 }
 
-func (t *TemplateParameterTransformer) TransformParameters(parameters types.Unstructurable) (types.Unstructurable, error) {
+func (t *TemplateParameterTransformer) TransformParameters(namespace string, name string, parameters types.Unstructurable) (types.Unstructurable, error) {
+	data := parameters.ToUnstructured()
+	data["Namespace"] = namespace
+	data["Name"] = name
 	var buf bytes.Buffer
-	if err := t.template.Execute(&buf, parameters.ToUnstructured()); err != nil {
+	if err := t.template.Execute(&buf, data); err != nil {
 		return nil, err
 	}
 	var transformedParameters types.UnstructurableMap

pkg/manifests/types.go

@@ -41,11 +41,11 @@ type TransformableGenerator interface {
 // Parameter transformer interface.
 // Allows to manipulate the parameters passed to an existing generator.
 type ParameterTransformer interface {
-	TransformParameters(parameters types.Unstructurable) (types.Unstructurable, error)
+	TransformParameters(namespace string, name string, parameters types.Unstructurable) (types.Unstructurable, error)
 }
 
 // Object transformer interface.
 // Allows to manipulate the parameters returned by an existing generator.
 type ObjectTransformer interface {
-	TransformObjects(objects []client.Object) ([]client.Object, error)
+	TransformObjects(namespace string, name string, objects []client.Object) ([]client.Object, error)
 }