Add @JsonIgore to length fields for OF statistics replies

src/main/java/org/openflow/protocol/statistics/OFAggregateStatisticsReply.java

@@ -18,6 +18,7 @@
 package org.openflow.protocol.statistics;
 
 
+import org.codehaus.jackson.annotate.JsonIgnore;
 import org.jboss.netty.buffer.ChannelBuffer;
 
 /**
@@ -72,6 +73,7 @@ public class OFAggregateStatisticsReply implements OFStatistics {
     }
 
     @Override
+    @JsonIgnore
     public int getLength() {
         return 24;
     }

src/main/java/org/openflow/protocol/statistics/OFFlowStatisticsReply.java

@@ -19,6 +19,7 @@ package org.openflow.protocol.statistics;
 
 import java.util.List;
 
+import org.codehaus.jackson.annotate.JsonIgnore;
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.openflow.protocol.OFMatch;
 import org.openflow.protocol.action.OFAction;
@@ -195,6 +196,7 @@ public class OFFlowStatisticsReply implements OFStatistics, OFActionFactoryAware
     }
 
     @Override
+    @JsonIgnore
     public int getLength() {
         return U16.f(length);
     }

src/main/java/org/openflow/protocol/statistics/OFPortStatisticsReply.java

@@ -18,6 +18,7 @@
 package org.openflow.protocol.statistics;
 
 
+import org.codehaus.jackson.annotate.JsonIgnore;
 import org.jboss.netty.buffer.ChannelBuffer;
 
 /**
@@ -222,6 +223,7 @@ public class OFPortStatisticsReply implements OFStatistics {
     }
 
     @Override
+    @JsonIgnore
     public int getLength() {
         return 104;
     }

src/main/java/org/openflow/protocol/statistics/OFQueueStatisticsReply.java

@@ -18,6 +18,7 @@
 package org.openflow.protocol.statistics;
 
 
+import org.codehaus.jackson.annotate.JsonIgnore;
 import org.jboss.netty.buffer.ChannelBuffer;
 
 /**
@@ -102,6 +103,7 @@ public class OFQueueStatisticsReply implements OFStatistics {
     }
 
     @Override
+    @JsonIgnore
     public int getLength() {
         return 32;
     }