/**

  * HTML via Java(tm) Language Bindings

  * Copyright (C) 2013 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. apidesign.org

  * designates this particular file as subject to the

  * "Classpath" exception as provided by apidesign.org

  * in the License file that accompanied this code.

  *

  * 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://wiki.apidesign.org/wiki/GPLwithClassPathException

  */

 package org.apidesign.html.boot.impl;

 import java.io.Reader;

 import java.net.URL;

 import java.net.URLClassLoader;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Collection;

 import java.util.List;

 import javax.script.Invocable;

 import javax.script.ScriptEngine;

 import javax.script.ScriptEngineManager;

 import javax.script.ScriptException;

 import org.apidesign.html.boot.spi.Fn;

 import org.testng.annotations.BeforeClass;

 /**

  *

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

  */

 public class FnTest extends JsClassLoaderBase {

     public FnTest() {

     }

     @BeforeClass

     public static void createClassLoader() throws Exception {

         ScriptEngineManager sem = new ScriptEngineManager();

         final ScriptEngine eng = sem.getEngineByMimeType("text/javascript");

         final URL my = FnTest.class.getProtectionDomain().getCodeSource().getLocation();

         ClassLoader parent = JsClassLoaderTest.class.getClassLoader().getParent();

         final URLClassLoader ul = new URLClassLoader(new URL[] { my }, parent);

         class Impl implements FindResources, Fn.Presenter {

             @Override

             public void findResources(String path, Collection<? super URL> results, boolean oneIsEnough) {

                 URL u = ul.findResource(path);

                 if (u != null) {

                     results.add(u);

                 }

             }

             @Override

             public Fn defineFn(String code, String... names) {

                 StringBuilder sb = new StringBuilder();

                 sb.append("(function() {");

                 sb.append("return function(");

                 String sep = "";

                 for (String n : names) {

                     sb.append(sep);

                     sb.append(n);

                     sep = ", ";

                 }

                 sb.append(") {");

                 sb.append(code);

                 sb.append("};");

                 sb.append("})()");

                 try {

                     final Object val = eng.eval(sb.toString());

                     return new Fn() {

                         @Override

                         public Object invoke(Object thiz, Object... args) throws Exception {

                             List<Object> all = new ArrayList<Object>(args.length + 1);

                             all.add(thiz == null ? val : thiz);

                             all.addAll(Arrays.asList(args));

                             Invocable inv = (Invocable)eng;

                             try {

                                 Object ret = inv.invokeMethod(val, "call", all.toArray());

                                 return ret == val ? null : ret;

                             } catch (ScriptException ex) {

                                 throw ex;

                             }

                         }

                     };

                 } catch (ScriptException ex) {

                     throw new LinkageError("Can't parse: " + sb, ex);

                 }

             }

             @Override

             public void displayPage(URL resource, Runnable r) {

                 throw new UnsupportedOperationException();

             }

             @Override

             public void loadScript(Reader code) throws Exception {

                 eng.eval(code);

             }

         }

         Impl impl = new Impl();

         ClassLoader loader = FnUtils.newLoader(impl, impl, parent);

         methodClass = loader.loadClass(JsMethods.class.getName());

     }

 }