diff --git a/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java b/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java
index 83d02da..2a06530 100644
--- a/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java
+++ b/java_gen/pre-written/src/main/java/org/openflow/types/OFMetadata.java
@@ -6,6 +6,9 @@
     
     private static int LENGTH = 8;
 
+    public static final OFMetadata FULL_MASK = OFMetadata.of(0xFFFFFFFFFFFFFFFFl);
+    public static final OFMetadata NO_MASK = OFMetadata.of(0x0);
+
     protected OFMetadata(long raw) {
         super(raw);
     }