diff --git a/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFPort.java b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFPort.java
new file mode 100644
index 0000000..d65d0aa
--- /dev/null
+++ b/java_gen/pre-written/src/main/java/org/projectfloodlight/openflow/types/OFPort.java
@@ -0,0 +1,541 @@
+package org.projectfloodlight.openflow.types;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.projectfloodlight.openflow.annotations.Immutable;
+import org.projectfloodlight.openflow.exceptions.OFParseError;
+
+/**
+ * Abstraction of an logical / OpenFlow switch port (ofp_port_no) in OpenFlow.
+ * Immutable. Note: Switch port numbers were changed in OpenFlow 1.1 from uint16
+ * to uint32. This class uses a 32 bit representation internally. Port numbers
+ * are converted from/to uint16 when constructed / getPortNumberasShort is
+ * called. If this port is not representable in OpenFlow 1.0, an
+ * IllegalStateException is raised.
+ *
+ * @author Andreas Wundsam <andreas.wundsam@bigswitch.com>
+ */
+@Immutable
+public class OFPort implements OFValueType<OFPort> {
+    static final int LENGTH = 4;
+    
+    // private int constants (OF1.1+) to avoid duplication in the code
+    // should not have to use these outside this class
+    private static final int OFPP_ANY_INT = 0xFFffFFff;
+    private static final int OFPP_LOCAL_INT = 0xFFffFFfe;
+    private static final int OFPP_CONTROLLER_INT = 0xFFffFFfd;
+    private static final int OFPP_ALL_INT = 0xFFffFFfc;
+    private static final int OFPP_FLOOD_INT = 0xFFffFFfb;
+    private static final int OFPP_NORMAL_INT = 0xFFffFFfa;
+    private static final int OFPP_TABLE_INT = 0xFFffFFf9;
+    private static final int OFPP_MAX_INT = 0xFFffFF00;
+    private static final int OFPP_IN_PORT_INT = 0xFFffFFf8;
+
+    // private short constants (OF1.0) to avoid duplication in the code
+    // should not have to use these outside this class
+    private static final short OFPP_ANY_SHORT = (short) 0xFFff;
+    private static final short OFPP_LOCAL_SHORT = (short) 0xFFfe;
+    private static final short OFPP_CONTROLLER_SHORT = (short) 0xFFfd;
+    private static final short OFPP_ALL_SHORT = (short) 0xFFfc;
+    private static final short OFPP_FLOOD_SHORT = (short) 0xFFfb;
+    private static final short OFPP_NORMAL_SHORT = (short) 0xFFfa;
+    private static final short OFPP_TABLE_SHORT = (short) 0xFFf9;
+    private static final short OFPP_IN_PORT_SHORT = (short) 0xFFf8;
+    private static final short OFPP_MAX_SHORT = (short) 0xFF00;
+    private static final int OFPP_MAX_SHORT_UNSIGNED = 0xFF00;
+
+    // ////////////// public constants - use to access well known OpenFlow ports
+
+    /** Maximum number of physical and logical switch ports. */
+    public final static OFPort MAX = new NamedPort(OFPP_MAX_INT, "max");
+
+    /**
+     * Send the packet out the input port. This reserved port must be explicitly
+     * used in order to send back out of the input port.
+     */
+    public final static OFPort IN_PORT = new NamedPort(OFPP_IN_PORT_INT, "in_port");
+
+    /**
+     * Submit the packet to the first flow table NB: This destination port can
+     * only be used in packet-out messages.
+     */
+    public final static OFPort TABLE = new NamedPort(OFPP_TABLE_INT, "table");
+
+    /** Process with normal L2/L3 switching. */
+    public final static OFPort NORMAL = new NamedPort(OFPP_NORMAL_INT, "normal");
+
+    /**
+     * All physical ports in VLAN, except input port and those blocked or link
+     * down
+     */
+    public final static OFPort FLOOD = new NamedPort(OFPP_FLOOD_INT, "flood");
+
+    /** All physical ports except input port */
+    public final static OFPort ALL = new NamedPort(OFPP_ALL_INT, "all");
+
+    /** Send to controller */
+    public final static OFPort CONTROLLER =
+            new NamedPort(OFPP_CONTROLLER_INT, "controller");
+
+    /** local openflow "port" */
+    public final static OFPort LOCAL = new NamedPort(OFPP_LOCAL_INT, "local");
+
+    /**
+     * Wildcard port used only for flow mod (delete) and flow stats requests.
+     * Selects all flows regardless of output port (including flows with no
+     * output port). NOTE: OpenFlow 1.0 calls this 'NONE'
+     */
+    public final static OFPort ANY = new NamedPort(OFPP_ANY_INT, "any");
+
+    public static final OFPort NO_MASK = OFPort.of(0xFFFFFFFF);
+    public static final OFPort FULL_MASK = OFPort.of(0x0);
+    
+    /** cache of frequently used ports */
+    private static class PrecachedPort {
+        private final static OFPort p1 = new OFPort(1);
+        private final static OFPort p2 = new OFPort(2);
+        private final static OFPort p3 = new OFPort(3);
+        private final static OFPort p4 = new OFPort(4);
+        private final static OFPort p5 = new OFPort(5);
+        private final static OFPort p6 = new OFPort(6);
+        private final static OFPort p7 = new OFPort(7);
+        private final static OFPort p8 = new OFPort(8);
+        private final static OFPort p9 = new OFPort(9);
+        private final static OFPort p10 = new OFPort(10);
+        private final static OFPort p11 = new OFPort(11);
+        private final static OFPort p12 = new OFPort(12);
+        private final static OFPort p13 = new OFPort(13);
+        private final static OFPort p14 = new OFPort(14);
+        private final static OFPort p15 = new OFPort(15);
+        private final static OFPort p16 = new OFPort(16);
+        private final static OFPort p17 = new OFPort(17);
+        private final static OFPort p18 = new OFPort(18);
+        private final static OFPort p19 = new OFPort(19);
+        private final static OFPort p20 = new OFPort(20);
+        private final static OFPort p21 = new OFPort(21);
+        private final static OFPort p22 = new OFPort(22);
+        private final static OFPort p23 = new OFPort(23);
+        private final static OFPort p24 = new OFPort(24);
+        private final static OFPort p25 = new OFPort(25);
+        private final static OFPort p26 = new OFPort(26);
+        private final static OFPort p27 = new OFPort(27);
+        private final static OFPort p28 = new OFPort(28);
+        private final static OFPort p29 = new OFPort(29);
+        private final static OFPort p31 = new OFPort(31);
+        private final static OFPort p32 = new OFPort(32);
+        private final static OFPort p33 = new OFPort(33);
+        private final static OFPort p34 = new OFPort(34);
+        private final static OFPort p35 = new OFPort(35);
+        private final static OFPort p36 = new OFPort(36);
+        private final static OFPort p37 = new OFPort(37);
+        private final static OFPort p38 = new OFPort(38);
+        private final static OFPort p39 = new OFPort(39);
+        private final static OFPort p40 = new OFPort(40);
+        private final static OFPort p41 = new OFPort(41);
+        private final static OFPort p42 = new OFPort(42);
+        private final static OFPort p43 = new OFPort(43);
+        private final static OFPort p44 = new OFPort(44);
+        private final static OFPort p45 = new OFPort(45);
+        private final static OFPort p46 = new OFPort(46);
+        private final static OFPort p47 = new OFPort(47);
+        private final static OFPort p48 = new OFPort(48);
+    }
+
+    /** raw openflow port number as a signed 32 bit integer */
+    private final int portNumber;
+
+    /** private constructor. use of*-Factory methods instead */
+    private OFPort(final int portNumber) {
+        this.portNumber = portNumber;
+    }
+
+    /**
+     * get an OFPort object corresponding to a raw 32-bit integer port number.
+     * NOTE: The port object may either be newly allocated or cached. Do not
+     * rely on either behavior.
+     *
+     * @param portNumber
+     * @return a corresponding OFPort
+     */
+    public static OFPort ofInt(final int portNumber) {
+        switch (portNumber) {
+            case 1:
+                return PrecachedPort.p1;
+            case 2:
+                return PrecachedPort.p2;
+            case 3:
+                return PrecachedPort.p3;
+            case 4:
+                return PrecachedPort.p4;
+            case 5:
+                return PrecachedPort.p5;
+            case 6:
+                return PrecachedPort.p6;
+            case 7:
+                return PrecachedPort.p7;
+            case 8:
+                return PrecachedPort.p8;
+            case 9:
+                return PrecachedPort.p9;
+            case 10:
+                return PrecachedPort.p10;
+            case 11:
+                return PrecachedPort.p11;
+            case 12:
+                return PrecachedPort.p12;
+            case 13:
+                return PrecachedPort.p13;
+            case 14:
+                return PrecachedPort.p14;
+            case 15:
+                return PrecachedPort.p15;
+            case 16:
+                return PrecachedPort.p16;
+            case 17:
+                return PrecachedPort.p17;
+            case 18:
+                return PrecachedPort.p18;
+            case 19:
+                return PrecachedPort.p19;
+            case 20:
+                return PrecachedPort.p20;
+            case 21:
+                return PrecachedPort.p21;
+            case 22:
+                return PrecachedPort.p22;
+            case 23:
+                return PrecachedPort.p23;
+            case 24:
+                return PrecachedPort.p24;
+            case 25:
+                return PrecachedPort.p25;
+            case 26:
+                return PrecachedPort.p26;
+            case 27:
+                return PrecachedPort.p27;
+            case 28:
+                return PrecachedPort.p28;
+            case 29:
+                return PrecachedPort.p29;
+            case 31:
+                return PrecachedPort.p31;
+            case 32:
+                return PrecachedPort.p32;
+            case 33:
+                return PrecachedPort.p33;
+            case 34:
+                return PrecachedPort.p34;
+            case 35:
+                return PrecachedPort.p35;
+            case 36:
+                return PrecachedPort.p36;
+            case 37:
+                return PrecachedPort.p37;
+            case 38:
+                return PrecachedPort.p38;
+            case 39:
+                return PrecachedPort.p39;
+            case 40:
+                return PrecachedPort.p40;
+            case 41:
+                return PrecachedPort.p41;
+            case 42:
+                return PrecachedPort.p42;
+            case 43:
+                return PrecachedPort.p43;
+            case 44:
+                return PrecachedPort.p44;
+            case 45:
+                return PrecachedPort.p45;
+            case 46:
+                return PrecachedPort.p46;
+            case 47:
+                return PrecachedPort.p47;
+            case 48:
+                return PrecachedPort.p48;
+            case OFPP_MAX_INT:
+                return MAX;
+            case OFPP_IN_PORT_INT:
+                return IN_PORT;
+            case OFPP_TABLE_INT:
+                return TABLE;
+            case OFPP_NORMAL_INT:
+                return NORMAL;
+            case OFPP_FLOOD_INT:
+                return FLOOD;
+            case OFPP_ALL_INT:
+                return ALL;
+            case OFPP_CONTROLLER_INT:
+                return CONTROLLER;
+            case OFPP_LOCAL_INT:
+                return LOCAL;
+            case OFPP_ANY_INT:
+                return ANY;
+            default:
+                // note: This means effectively : portNumber > OFPP_MAX_SHORT
+                // accounting for
+                // signedness of both portNumber and OFPP_MAX_INT(which is
+                // -256).
+                // Any unsigned integer value > OFPP_MAX_INT will be ]-256:0[
+                // when read signed
+                if (portNumber < 0 && portNumber > OFPP_MAX_INT)
+                    throw new IllegalArgumentException("Unknown special port number: "
+                            + portNumber);
+                return new OFPort(portNumber);
+        }
+    }
+
+    /** convenience function: delegates to ofInt */
+    public static OFPort of(final int portNumber) {
+        return ofInt(portNumber);
+    }
+
+    /**
+     * get an OFPort object corresponding to a raw signed 16-bit integer port
+     * number (OF1.0). Note that the port returned will have the corresponding
+     * 32-bit integer value allocated as its port number. NOTE: The port object
+     * may either be newly allocated or cached. Do not rely on either behavior.
+     *
+     * @param portNumber
+     * @return a corresponding OFPort
+     */
+    public static OFPort ofShort(final short portNumber) {
+        switch (portNumber) {
+            case 1:
+                return PrecachedPort.p1;
+            case 2:
+                return PrecachedPort.p2;
+            case 3:
+                return PrecachedPort.p3;
+            case 4:
+                return PrecachedPort.p4;
+            case 5:
+                return PrecachedPort.p5;
+            case 6:
+                return PrecachedPort.p6;
+            case 7:
+                return PrecachedPort.p7;
+            case 8:
+                return PrecachedPort.p8;
+            case 9:
+                return PrecachedPort.p9;
+            case 10:
+                return PrecachedPort.p10;
+            case 11:
+                return PrecachedPort.p11;
+            case 12:
+                return PrecachedPort.p12;
+            case 13:
+                return PrecachedPort.p13;
+            case 14:
+                return PrecachedPort.p14;
+            case 15:
+                return PrecachedPort.p15;
+            case 16:
+                return PrecachedPort.p16;
+            case 17:
+                return PrecachedPort.p17;
+            case 18:
+                return PrecachedPort.p18;
+            case 19:
+                return PrecachedPort.p19;
+            case 20:
+                return PrecachedPort.p20;
+            case 21:
+                return PrecachedPort.p21;
+            case 22:
+                return PrecachedPort.p22;
+            case 23:
+                return PrecachedPort.p23;
+            case 24:
+                return PrecachedPort.p24;
+            case 25:
+                return PrecachedPort.p25;
+            case 26:
+                return PrecachedPort.p26;
+            case 27:
+                return PrecachedPort.p27;
+            case 28:
+                return PrecachedPort.p28;
+            case 29:
+                return PrecachedPort.p29;
+            case 31:
+                return PrecachedPort.p31;
+            case 32:
+                return PrecachedPort.p32;
+            case 33:
+                return PrecachedPort.p33;
+            case 34:
+                return PrecachedPort.p34;
+            case 35:
+                return PrecachedPort.p35;
+            case 36:
+                return PrecachedPort.p36;
+            case 37:
+                return PrecachedPort.p37;
+            case 38:
+                return PrecachedPort.p38;
+            case 39:
+                return PrecachedPort.p39;
+            case 40:
+                return PrecachedPort.p40;
+            case 41:
+                return PrecachedPort.p41;
+            case 42:
+                return PrecachedPort.p42;
+            case 43:
+                return PrecachedPort.p43;
+            case 44:
+                return PrecachedPort.p44;
+            case 45:
+                return PrecachedPort.p45;
+            case 46:
+                return PrecachedPort.p46;
+            case 47:
+                return PrecachedPort.p47;
+            case 48:
+                return PrecachedPort.p48;
+            case OFPP_MAX_SHORT:
+                return MAX;
+            case OFPP_IN_PORT_SHORT:
+                return IN_PORT;
+            case OFPP_TABLE_SHORT:
+                return TABLE;
+            case OFPP_NORMAL_SHORT:
+                return NORMAL;
+            case OFPP_FLOOD_SHORT:
+                return FLOOD;
+            case OFPP_ALL_SHORT:
+                return ALL;
+            case OFPP_CONTROLLER_SHORT:
+                return CONTROLLER;
+            case OFPP_LOCAL_SHORT:
+                return LOCAL;
+            case OFPP_ANY_SHORT:
+                return ANY;
+            default:
+                // note: This means effectively : portNumber > OFPP_MAX_SHORT
+                // accounting for
+                // signedness of both portNumber and OFPP_MAX_SHORT (which is
+                // -256).
+                // Any unsigned integer value > OFPP_MAX_SHORT will be ]-256:0[
+                // when read signed
+                if (portNumber < 0 && portNumber > OFPP_MAX_SHORT)
+                    throw new IllegalArgumentException("Unknown special port number: "
+                            + portNumber);
+                return new OFPort(portNumber);
+        }
+    }
+
+    /** return the port number as a int32 */
+    public int getPortNumber() {
+        return portNumber;
+    }
+
+    /**
+     * return the port number as int16. Special ports as defined by the OpenFlow
+     * spec will be converted to their OpenFlow 1.0 equivalent. port numbers >=
+     * FF00 will cause a IllegalArgumentException to be thrown
+     *
+     * @throws IllegalArgumentException
+     *             if a regular port number exceeds the maximum value in OF1.0
+     **/
+    public short getShortPortNumber() {
+
+        switch (portNumber) {
+            case OFPP_MAX_INT:
+                return OFPP_MAX_SHORT;
+            case OFPP_IN_PORT_INT:
+                return OFPP_IN_PORT_SHORT;
+            case OFPP_TABLE_INT:
+                return OFPP_TABLE_SHORT;
+            case OFPP_NORMAL_INT:
+                return OFPP_NORMAL_SHORT;
+            case OFPP_FLOOD_INT:
+                return OFPP_FLOOD_SHORT;
+            case OFPP_ALL_INT:
+                return OFPP_ALL_SHORT;
+            case OFPP_CONTROLLER_INT:
+                return OFPP_CONTROLLER_SHORT;
+            case OFPP_LOCAL_INT:
+                return OFPP_LOCAL_SHORT;
+            case OFPP_ANY_INT:
+                return OFPP_ANY_SHORT;
+
+            default:
+                if (portNumber >= OFPP_MAX_SHORT_UNSIGNED || portNumber < 0)
+                    throw new IllegalArgumentException("32bit Port number "
+                            + U32.f(portNumber)
+                            + " cannot be represented as uint16 (OF1.0)");
+
+                return (short) portNumber;
+        }
+    }
+
+    @Override
+    public String toString() {
+        return Long.toString(U32.f(portNumber));
+    }
+
+    /** Extension of OFPort for named ports */
+    static class NamedPort extends OFPort {
+        private final String name;
+
+        NamedPort(final int portNo, final String name) {
+            super(portNo);
+            this.name = name;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+        @Override
+        public String toString() {
+            return name;
+        }
+    }
+
+    @Override
+    public int getLength() {
+        return LENGTH;
+    }
+    
+    @Override
+    public boolean equals(Object obj) {
+        if (!(obj instanceof OFPort))
+            return false;
+        OFPort other = (OFPort)obj;
+        if (other.portNumber != this.portNumber)
+            return false;
+        return true;
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 53;
+        int result = 1;
+        result = prime * result + portNumber;
+        return result;
+    }
+
+    public void write2Bytes(ChannelBuffer c) {
+        c.writeShort(this.portNumber);
+    }
+
+    public static OFPort read2Bytes(ChannelBuffer c) throws OFParseError {
+        return OFPort.ofShort(c.readShort());
+    }
+
+    public void write4Bytes(ChannelBuffer c) {
+        c.writeInt(this.portNumber);
+    }
+
+    public static OFPort read4Bytes(ChannelBuffer c) throws OFParseError {
+        return OFPort.of((int)(c.readUnsignedInt() & 0xFFFFFFFF));
+    }
+
+    @Override
+    public OFPort applyMask(OFPort mask) {
+        return OFPort.of(this.portNumber & mask.portNumber);
+    }
+}