Group subsystem Northbound and Southbound API definition
Change-Id: I1843562ff7fdf0dfdf82a8757382d494698ded3f
diff --git a/core/api/src/main/java/org/onosproject/net/group/GroupKey.java b/core/api/src/main/java/org/onosproject/net/group/GroupKey.java
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+++ b/core/api/src/main/java/org/onosproject/net/group/GroupKey.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * 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 org.onosproject.net.group;
+
+/* Representation of generalized Key that would be used to store
+ * groups in <Key, Value> store. Implementation of this interface
+ * MUST override "equals()" and "hashcode()" methods.
+ */
+public interface GroupKey {
+}