diff -r 5a907f38608d -r 462dd9238173 ko/bck2brwsr/src/main/java/org/apidesign/bck2brwsr/ko2brwsr/ConvertTypes.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ko/bck2brwsr/src/main/java/org/apidesign/bck2brwsr/ko2brwsr/ConvertTypes.java	Wed Jun 26 19:29:54 2013 +0200
@@ -0,0 +1,152 @@
+/**
+ * Back 2 Browser Bytecode Translator
+ * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. Look for COPYING file in the top folder.
+ * If not, see http://opensource.org/licenses/GPL-2.0.
+ */
+package org.apidesign.bck2brwsr.ko2brwsr;
+
+import org.apidesign.bck2brwsr.core.JavaScriptBody;
+
+/**
+ *
+ * @author Jaroslav Tulach <jtulach@netbeans.org>
+ */
+final class ConvertTypes {
+    ConvertTypes() {
+    }
+    
+    public static String toString(Object object, String property) {
+        Object ret = getProperty(object, property);
+        return ret == null ? null : ret.toString();
+    }
+
+    public static double toDouble(Object object, String property) {
+        Object ret = getProperty(object, property);
+        return ret instanceof Number ? ((Number)ret).doubleValue() : Double.NaN;
+    }
+
+    public static int toInt(Object object, String property) {
+        Object ret = getProperty(object, property);
+        return ret instanceof Number ? ((Number)ret).intValue() : Integer.MIN_VALUE;
+    }
+
+    public static <T> T toModel(Class<T> modelClass, Object object, String property) {
+        Object ret = getProperty(object, property);
+        if (ret == null || modelClass.isInstance(ret)) {
+            return modelClass.cast(ret);
+        }
+        throw new IllegalStateException("Value " + ret + " is not of type " + modelClass);
+    }
+    
+    public static String toJSON(Object value) {
+        if (value == null) {
+            return "null";
+        }
+        if (value instanceof Enum) {
+            value = value.toString();
+        }
+        if (value instanceof String) {
+            return '"' + 
+                ((String)value).
+                    replace("\"", "\\\"").
+                    replace("\n", "\\n").
+                    replace("\r", "\\r").
+                    replace("\t", "\\t")
+                + '"';
+        }
+        return value.toString();
+    }
+    
+    @JavaScriptBody(args = { "object", "property" },
+        body = "if (property === null) return object;\n"
+        + "var p = object[property]; return p ? p : null;"
+    )
+    private static Object getProperty(Object object, String property) {
+        return null;
+    }
+    
+    public static String createJSONP(Object[] jsonResult, Runnable whenDone) {
+        int h = whenDone.hashCode();
+        String name;
+        for (;;) {
+            name = "jsonp" + Integer.toHexString(h);
+            if (defineIfUnused(name, jsonResult, whenDone)) {
+                return name;
+            }
+            h++;
+        }
+    }
+
+    @JavaScriptBody(args = { "name", "arr", "run" }, body = 
+        "if (window[name]) return false;\n "
+      + "window[name] = function(data) {\n "
+      + "  delete window[name];\n"
+      + "  var el = window.document.getElementById(name);\n"
+      + "  el.parentNode.removeChild(el);\n"
+      + "  arr[0] = data;\n"
+      + "  run.run__V();\n"
+      + "};\n"
+      + "return true;\n"
+    )
+    private static boolean defineIfUnused(String name, Object[] arr, Runnable run) {
+        return true;
+    }
+    
+    @JavaScriptBody(args = { "s" }, body = "return eval('(' + s + ')');")
+    static Object parse(String s) {
+        return s;
+    }
+    
+    @JavaScriptBody(args = { "url", "arr", "callback", "method", "data" }, body = ""
+        + "var request = new XMLHttpRequest();\n"
+        + "if (!method) method = 'GET';\n"
+        + "request.open(method, url, true);\n"
+        + "request.setRequestHeader('Content-Type', 'application/json; charset=utf-8');\n"
+        + "request.onreadystatechange = function() {\n"
+        + "  if (this.readyState!==4) return;\n"
+        + "  try {\n"
+        + "    arr[0] = eval('(' + this.response + ')');\n"
+        + "  } catch (error) {;\n"
+        + "    arr[0] = this.response;\n"
+        + "  }\n"
+        + "  callback.run__V();\n"
+        + "};"
+        + "if (data) request.send(data);"
+        + "else request.send();"
+    )
+    static void loadJSON(
+        String url, Object[] jsonResult, Runnable whenDone, String method, String data
+    ) {
+    }
+    
+    @JavaScriptBody(args = { "url", "jsonp" }, body = 
+        "var scrpt = window.document.createElement('script');\n "
+        + "scrpt.setAttribute('src', url);\n "
+        + "scrpt.setAttribute('id', jsonp);\n "
+        + "scrpt.setAttribute('type', 'text/javascript');\n "
+        + "var body = document.getElementsByTagName('body')[0];\n "
+        + "body.appendChild(scrpt);\n"
+    )
+    static void loadJSONP(String url, String jsonp) {
+        
+    }
+    
+    public static void extractJSON(Object jsonObject, String[] props, Object[] values) {
+        for (int i = 0; i < props.length; i++) {
+            values[i] = getProperty(jsonObject, props[i]);
+        }
+    }
+    
+}