X-Git-Url: https://git.opendaylight.org/gerrit/gitweb?a=blobdiff_plain;f=opendaylight%2Fprotocol_plugins%2Fopenflow%2Fsrc%2Fmain%2Fjava%2Forg%2Fopendaylight%2Fcontroller%2Fprotocol_plugin%2Fopenflow%2Finternal%2FReadServiceFilter.java;h=b21a105f157809a94d7e4ff3530318c1921e9f4d;hb=34fc95a8574f5b8344e5c3b1000c9459517238c2;hp=d7bf2e22586188f578c72e02d9c453551a380ccd;hpb=5466b63d3ad41fadf0aa4d5bf69b77c32f5d6638;p=controller.git

diff --git a/opendaylight/protocol_plugins/openflow/src/main/java/org/opendaylight/controller/protocol_plugin/openflow/internal/ReadServiceFilter.java b/opendaylight/protocol_plugins/openflow/src/main/java/org/opendaylight/controller/protocol_plugin/openflow/internal/ReadServiceFilter.java
index d7bf2e2258..b21a105f15 100644
--- a/opendaylight/protocol_plugins/openflow/src/main/java/org/opendaylight/controller/protocol_plugin/openflow/internal/ReadServiceFilter.java
+++ b/opendaylight/protocol_plugins/openflow/src/main/java/org/opendaylight/controller/protocol_plugin/openflow/internal/ReadServiceFilter.java
@@ -189,7 +189,7 @@ public class ReadServiceFilter implements IReadServiceFilter, IContainerListener
         List<FlowOnNode> flowOnNodeList = new FlowStatisticsConverter(ofList).getFlowOnNodeList(node);
         List<FlowOnNode> filteredList = filterFlowListPerContainer(container, node, flowOnNodeList);
 
-        return (filteredList == null || filteredList.isEmpty()) ? null : filteredList.get(0);
+        return (filteredList.isEmpty()) ? null : filteredList.get(0);
     }
 
     @Override
@@ -203,10 +203,8 @@ public class ReadServiceFilter implements IReadServiceFilter, IContainerListener
 
         // Convert and filter the statistics per container
         List<FlowOnNode> flowOnNodeList = new FlowStatisticsConverter(ofList).getFlowOnNodeList(node);
-        List<FlowOnNode> filteredList = filterFlowListPerContainer(container, node, flowOnNodeList);
-
-        return (filteredList == null) ? null : filteredList;
 
+        return filterFlowListPerContainer(container, node, flowOnNodeList);
     }
 
     @Override
@@ -233,10 +231,10 @@ public class ReadServiceFilter implements IReadServiceFilter, IContainerListener
      * @param list
      * @return
      */
-    public List<FlowOnNode> filterFlowListPerContainer(String container,
+    private List<FlowOnNode> filterFlowListPerContainer(String container,
             Node nodeId, List<FlowOnNode> list) {
         if (list == null) {
-            return null;
+            return Collections.emptyList();
         }
 
         // Create new filtered list of flows
@@ -260,9 +258,9 @@ public class ReadServiceFilter implements IReadServiceFilter, IContainerListener
      * @param list
      * @return
      */
-    public List<OFStatistics> filterPortListPerContainer(String container, long switchId, List<OFStatistics> list) {
+    private List<OFStatistics> filterPortListPerContainer(String container, long switchId, List<OFStatistics> list) {
         if (list == null) {
-            return null;
+            return Collections.emptyList();
         }
 
         // Create new filtered list of flows
@@ -281,10 +279,10 @@ public class ReadServiceFilter implements IReadServiceFilter, IContainerListener
     }
 
 
-    public List<OFStatistics> filterTableListPerContainer(
+    private List<OFStatistics> filterTableListPerContainer(
             String container, long switchId, List<OFStatistics> list) {
         if (list == null) {
-            return null;
+            return Collections.emptyList();
         }
 
         // Create new filtered list of node tables