ONOS-885: Group store interface definition and in-memory store implementation

Change-Id: I1125fbc23f1e58bcb8aaf5f67c02da610fa7ef25

ONOS-885: Group store interface definition and in-memory store implementation

Change-Id: Id3794bed63785e10ed86c0b5d90bf875d127224c
diff --git a/core/api/src/main/java/org/onosproject/net/group/GroupOperations.java b/core/api/src/main/java/org/onosproject/net/group/GroupOperations.java
index 629ecd3..bc03628 100644
--- a/core/api/src/main/java/org/onosproject/net/group/GroupOperations.java
+++ b/core/api/src/main/java/org/onosproject/net/group/GroupOperations.java
@@ -19,9 +19,13 @@
 
 import java.util.List;
 
-
 import com.google.common.collect.ImmutableList;
 
+/**
+ * Immutable collection of group operation to be used between
+ * core and provider layers of group subsystem.
+ *
+ */
 public final class GroupOperations {
     private final List<GroupOperation> operations;
 
@@ -35,7 +39,7 @@
     }
 
     /**
-     * Immutable list of group operation.
+     * Returns immutable list of group operation.
      *
      * @return list of group operation
      */