Return singleton empty collection instead of null in Read service code

[controller.git] / opendaylight / sal / implementation / src / main / java / org / opendaylight / controller / sal / implementation / internal / Topology.java

diff --git a/opendaylight/sal/implementation/src/main/java/org/opendaylight/controller/sal/implementation/internal/Topology.java b/opendaylight/sal/implementation/src/main/java/org/opendaylight/controller/sal/implementation/internal/Topology.java
index f965d7f2c402e21d6cf920f15ad0413ef7bd6785..d48809664871002d32d11d7afc5ba679c4440987 100644 (file)
--- a/opendaylight/sal/implementation/src/main/java/org/opendaylight/controller/sal/implementation/internal/Topology.java
+++ b/opendaylight/sal/implementation/src/main/java/org/opendaylight/controller/sal/implementation/internal/Topology.java
@@ -8,15 +8,12 @@
 
 package org.opendaylight.controller.sal.implementation.internal;
 
-import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
-import java.util.Collections;
 
 import org.opendaylight.controller.sal.core.Edge;
-import org.opendaylight.controller.sal.core.Property;
-import org.opendaylight.controller.sal.core.UpdateType;
 import org.opendaylight.controller.sal.topology.IListenTopoUpdates;
 import org.opendaylight.controller.sal.topology.IPluginInTopologyService;
 import org.opendaylight.controller.sal.topology.IPluginOutTopologyService;
@@ -60,7 +57,7 @@ public class Topology implements IPluginOutTopologyService, ITopologyService {
     /**
      * Function called by the dependency manager when all the required
      * dependencies are satisfied
-     * 
+     *
      */
     void init() {
     }
@@ -69,7 +66,7 @@ public class Topology implements IPluginOutTopologyService, ITopologyService {
      * Function called by the dependency manager when at least one dependency
      * become unsatisfied or when the component is shutting down because for
      * example bundle is being stopped.
-     * 
+     *
      */
     void destroy() {
         // Make sure to clear all the data structure we use to track