fixing checkstyle errors
diff --git a/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java b/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java
index 988b809..41c8adc 100644
--- a/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java
+++ b/of/api/src/main/java/org/onlab/onos/of/controller/DefaultPacketContext.java
@@ -5,7 +5,7 @@
 import org.projectfloodlight.openflow.protocol.OFPacketOut;
 import org.projectfloodlight.openflow.types.OFPort;
 
-public class DefaultPacketContext implements PacketContext {
+public final class DefaultPacketContext implements PacketContext {
 
     private boolean free = true;
     private boolean isBuilt = false;
@@ -55,7 +55,7 @@
         return null;
     }
 
-    public static PacketContext PacketContextFromPacketIn(OpenFlowSwitch s, OFPacketIn pkt) {
+    public static PacketContext packetContextFromPacketIn(OpenFlowSwitch s, OFPacketIn pkt) {
         return new DefaultPacketContext(s, pkt);
     }