Kind  string
}

func (gk GroupKind) Empty() bool {
	return len(gk.Group) == 0 && len(gk.Kind) == 0
}

func (gk GroupKind) WithVersion(version string) GroupVersionKind {
	return GroupVersionKind{Group: gk.Group, Version: version, Kind: gk.Kind}
}

func (gk GroupKind) String() string {
	if len(gk.Group) == 0 {
		return gk.Kind
	}
	return gk.Kind + "." + gk.Group
}

func AddResource(name string, gk schema.GroupKind) {
	rc.mu.Lock()
	defer rc.mu.Unlock()
	if _, present := rc.resources[gk]; !present {
		rc.resources[gk] = map[string]struct{}{}
	}
	rc.resources[gk][name] = struct{}{}
}

// RemoveResource removes the resource of given kind to the set of owned objects
func RemoveResource(name string, gk schema.GroupKind) {
	rc.mu.Lock()
	defer rc.mu.Unlock()

// return the first match.
func (m MultiRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*RESTMapping, error) {
	allMappings := []*RESTMapping{}
	errors := []error{}

	for _, t := range m {
		currMapping, err := t.RESTMapping(gk, versions...)
		// ignore "no match" errors, but any other error percolates back up
		if IsNoMatchError(err) {
			continue

	"istio.io/istio/pkg/ptr"
	"istio.io/istio/pkg/typemap"
)

func MustGVRFromType[T runtime.Object]() schema.GroupVersionResource {
	if gk, ok := getGvk(ptr.Empty[T]()); ok {
		gr, ok := gvk.ToGVR(gk)
		if !ok {
			panic(fmt.Sprintf("unknown GVR for GVK %v", gk))
		}
		return gr
	}
	if rp := typemap.Get[RegisterType[T]](registeredTypes); rp != nil {
		return (*rp).GetGVR()
	}

	}
	return o.mapper.ResourcesFor(input)
}

func (o *lazyObject) RESTMapping(gk schema.GroupKind, versions ...string) (*RESTMapping, error) {
	if err := o.init(); err != nil {
		return nil, err
	}
	return o.mapper.RESTMapping(gk, versions...)
}

func (o *lazyObject) RESTMappings(gk schema.GroupKind, versions ...string) ([]*RESTMapping, error) {
	if err := o.init(); err != nil {
		return nil, err
	}

		expectKind     schema.GroupVersionKind
		expectedId     string
	}{
		{
			name:           "matched preferred group/kind",
			target:         gv("mygroup", "__internal"),
			preferredKinds: []schema.GroupKind{gk("mygroup", "Foo"), gk("anothergroup", "Bar")},
			kinds:          []schema.GroupVersionKind{gvk("yetanother", "v1", "Baz"), gvk("anothergroup", "v1", "Bar")},
			expectKind:     gvk("mygroup", "__internal", "Bar"),

		input string
		gvk   *GroupVersionKind
		gk    GroupKind
	}{
		{input: "Pod", gk: GroupKind{Kind: "Pod"}},
		{input: ".apps", gk: GroupKind{Group: "apps"}},
		{input: "Pod.", gk: GroupKind{Kind: "Pod"}},
		{input: "StatefulSet.apps", gk: GroupKind{Group: "apps", Kind: "StatefulSet"}},
		{input: "StatefulSet.v1.apps", gvk: &GroupVersionKind{Group: "apps", Version: "v1", Kind: "StatefulSet"}, gk: GroupKind{Group: "v1.apps", Kind: "StatefulSet"}},

// version should be used to access the named group/kind.
func (m *DefaultRESTMapper) RESTMapping(gk schema.GroupKind, versions ...string) (*RESTMapping, error) {
	mappings, err := m.RESTMappings(gk, versions...)
	if err != nil {
		return nil, err
	}
	if len(mappings) == 0 {
		return nil, &NoKindMatchError{GroupKind: gk, SearchedVersions: versions}
	}
	// since we rely on RESTMappings method

	Group string `json:"group" protobuf:"bytes,1,opt,name=group"`
	Kind  string `json:"kind" protobuf:"bytes,2,opt,name=kind"`
}

func (gk *GroupKind) String() string {
	if gk == nil {
		return "<nil>"
	}
	if len(gk.Group) == 0 {
		return gk.Kind
	}
	return gk.Kind + "." + gk.Group
}

// GroupVersionKind unambiguously identifies a kind.  It doesn't anonymously include GroupVersion

	gv, err := schema.ParseGroupVersion(u.GetAPIVersion())
	if err != nil {
		return res, err
	}

	gk := config.GroupVersionKind{
		Group:   gv.Group,
		Version: gv.Version,
		Kind:    u.GetKind(),
	}
	found, ok := gvk.ToGVR(gk)
	if !ok {
		return res, fmt.Errorf("unknown gvk: %v", gk)
	}
	return found, nil
}

// ObjectToGVR extracts the GVR of an unstructured resource. This is useful when using dynamic