/**

  * 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.launcher;

 import java.io.InputStream;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.net.URL;

 import org.apidesign.bck2brwsr.core.JavaScriptBody;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 public class Console {

     public static String welcome() {

         final String msg = "Hello from Bck2Brwsr!";

         alert(msg);

         return msg;

     }

     @JavaScriptBody(args = "msg", body = "alert(msg);")

     private static native void alert(String msg);

     @JavaScriptBody(args = {"id", "attr"}, body = 

         "return window.document.getElementById(id)[attr].toString();")

     private static native Object getAttr(String id, String attr);

     @JavaScriptBody(args = {"id", "attr", "value"}, body = 

         "window.document.getElementById(id)[attr] = value;")

     private static native void setAttr(String id, String attr, Object value);

     public static void execute() throws Exception {

         String clazz = (String) getAttr("clazz", "value");

         String method = (String) getAttr("method", "value");

         Object res = invokeMethod(clazz, method);

         setAttr("result", "value", res);

     }

     public static void harness() {

         try {

             URL u = new URL("/execute/data");

             String data = (String) u.getContent(new Class[] { String.class });

             setAttr("result", "value", data);

         } catch (Exception ex) {

             setAttr("result", "value", ex.getMessage());

         }

     }

     private static Object invokeMethod(String clazz, String method) 

     throws ClassNotFoundException, InvocationTargetException, 

     SecurityException, IllegalAccessException, IllegalArgumentException {

         Method found = null;

         Class<?> c = Class.forName(clazz);

         for (Method m : c.getMethods()) {

             if (m.getName().equals(method)) {

                 found = m;

             }

         }

         Object res;

         if (found != null) {

             res = found.invoke(null);

         } else {

             res = "Can't find method " + method + " in " + clazz;

         }

         return res;

     }

 }