java_gen: create OFFactory

first shot at factory interface for OF Objects. Will have to be
refined later.
diff --git a/java_gen/templates/of_factories.java b/java_gen/templates/of_factories.java
new file mode 100644
index 0000000..cce134d
--- /dev/null
+++ b/java_gen/templates/of_factories.java
@@ -0,0 +1,49 @@
+//:: # Copyright 2013, Big Switch Networks, Inc.
+//:: #
+//:: # LoxiGen is licensed under the Eclipse Public License, version 1.0 (EPL), with
+//:: # the following special exception:
+//:: #
+//:: # LOXI Exception
+//:: #
+//:: # As a special exception to the terms of the EPL, you may distribute libraries
+//:: # generated by LoxiGen (LoxiGen Libraries) under the terms of your choice, provided
+//:: # that copyright and licensing notices generated by LoxiGen are not altered or removed
+//:: # from the LoxiGen Libraries and the notice provided below is (i) included in
+//:: # the LoxiGen Libraries, if distributed in source code form and (ii) included in any
+//:: # documentation for the LoxiGen Libraries, if distributed in binary form.
+//:: #
+//:: # Notice: "Copyright 2013, Big Switch Networks, Inc. This library was generated by the LoxiGen Compiler."
+//:: #
+//:: # You may not use this file except in compliance with the EPL or LOXI Exception. You may obtain
+//:: # a copy of the EPL at:
+//:: #
+//:: # http::: #www.eclipse.org/legal/epl-v10.html
+//:: #
+//:: # Unless required by applicable law or agreed to in writing, software
+//:: # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//:: # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+//:: # EPL for the specific language governing permissions and limitations
+//:: # under the EPL.
+//::
+//:: import itertools
+//:: import of_g
+//:: include('_copyright.java')
+
+//:: include('_autogen.java')
+
+package org.openflow.protocol;
+
+//:: include("_imports.java")
+
+public final class OFFactories {
+    public static OFFactory getFactory(OFVersion version) {
+        switch(version) {
+            //:: for v in versions:
+            case ${v.constant_version}:
+                return org.openflow.protocol.ver${v.of_version}.OFFactoryVer${v.of_version}.getInstance();
+            //:: #endfor
+            default:
+                throw new IllegalArgumentException("Unknown version: "+version);
+            }
+    }
+}