diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/Masked.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/Masked.java
new file mode 100644
index 0000000..ead7d62
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/Masked.java
@@ -0,0 +1,61 @@
+package org.projectfloodlight.openflow.types;
+
+
+
+public class Masked<T extends OFValueType<T>> implements OFValueType<Masked<T>> {
+    protected T value;
+    protected T mask;
+    
+    protected Masked(T value, T mask) {
+        this.value = value.applyMask(mask);
+        this.mask = mask;
+    }
+    
+    public T getValue() {
+        return value;
+    }
+    
+    public T getMask() {
+        return mask;
+    }
+    
+    public static <T extends OFValueType<T>> Masked<T> of(T value, T mask) {
+        return new Masked<T>(value, mask);
+    }
+
+    @Override
+    public int getLength() {
+        return this.value.getLength() + this.mask.getLength();
+    }
+        
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof Masked<?>))
+            return false;
+        Masked<?> mobj = (Masked<?>)obj;
+        return this.value.equals(mobj.value) && this.mask.equals(mobj.mask);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 59;
+        int result = 1;
+        result = prime * result + this.value.hashCode();
+        result = prime * result + this.mask.hashCode();
+        return result;
+    }
+
+    @Override
+    public String toString() {
+        // General representation: value/mask
+        StringBuilder sb = new StringBuilder();
+        sb.append(value.toString()).append('/').append(mask.toString());
+        return sb.toString();
+    }
+
+    @Override
+    public Masked<T> applyMask(Masked<T> mask) {
+        return this;
+    }
+    
+}