diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFValueType.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFValueType.java
new file mode 100644
index 0000000..5f41494
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFValueType.java
@@ -0,0 +1,12 @@
+package org.projectfloodlight.openflow.types;
+
+
+
+
+public interface OFValueType<T extends OFValueType<T>> {
+
+    public int getLength();
+    
+    public T applyMask(T mask);
+
+}