@@ -22,3 +22,19 @@ func (r *NetworkPolicyReference) ToString() string {
 	}
 	return fmt.Sprintf("%s:%s/%s", r.Type, r.Namespace, r.Name)
 }
+
+func (r *GroupReference) ToString() string {
+	if r.Namespace == "" {
+		return r.Name
+	}
+	return fmt.Sprintf("%s/%s", r.Namespace, r.Name)
+}
+
+// ToTypedString returns the Group or ClusterGroup namespaced name as a string along with its type.
+// Typical usage of typed string will be to use in log messages.
+func (r *GroupReference) ToTypedString() string {
+	if r.Namespace == "" {
+		return fmt.Sprintf("ClusterGroup: %s", r.Name)
+	}
+	return fmt.Sprintf("Group: %s/%s", r.Namespace, r.Name)
+}
// Copyright 2020 Antrea 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 controlplane

import "fmt"

func (r *NetworkPolicyReference) ToString() string {
	if r.Type == AntreaClusterNetworkPolicy {
		return fmt.Sprintf("%s:%s", r.Type, r.Name)
	}
	return fmt.Sprintf("%s:%s/%s", r.Type, r.Namespace, r.Name)
}

nit: I notice that we don't have a space after the colon for the equivalent function for policies (`func (r *NetworkPolicyReference) ToString() string`)