/**

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

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.Reader;

 import java.net.URL;

 import java.util.Enumeration;

 /** 

  *

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  */

 abstract class JsClassLoader extends ClassLoader {

     JsClassLoader(ClassLoader parent) {

         super(parent);

         setDefaultAssertionStatus(JsClassLoader.class.desiredAssertionStatus());

     }

     @Override

     protected abstract URL findResource(String name);

     @Override

     protected abstract Enumeration<URL> findResources(String name);

     @Override

     protected Class<?> findClass(String name) throws ClassNotFoundException {

         if (name.startsWith("javafx")) {

             return Class.forName(name);

         }

         if (name.startsWith("netscape")) {

             return Class.forName(name);

         }

         if (name.startsWith("com.sun")) {

             return Class.forName(name);

         }

         if (name.equals(JsClassLoader.class.getName())) {

             return JsClassLoader.class;

         }

         if (name.equals(Fn.class.getName())) {

             return Fn.class;

         }

         if (name.equals(Fn.Presenter.class.getName())) {

             return Fn.Presenter.class;

         }

         if (name.equals(FnUtils.class.getName())) {

             return FnUtils.class;

         }

         if (

             name.equals("org.apidesign.html.boot.spi.Fn") ||

             name.equals("org.apidesign.html.boot.impl.FnUtils") ||

             name.equals("org.apidesign.html.boot.impl.FnContext")

         ) {

             return Class.forName(name);

         }

         URL u = findResource(name.replace('.', '/') + ".class");

         if (u != null) {

             InputStream is = null;

             try {

                 is = u.openStream();

                 byte[] arr = new byte[is.available()];

                 int len = 0;

                 while (len < arr.length) {

                     int read = is.read(arr, len, arr.length - len);

                     if (read == -1) {

                         throw new IOException("Can't read " + u);

                     }

                     len += read;

                 }

                 is.close();

                 is = null;

                 arr = FnUtils.transform(JsClassLoader.this, arr);

                 if (arr != null) {

                     return defineClass(name, arr, 0, arr.length);

                 }

             } catch (IOException ex) {

                 throw new ClassNotFoundException("Can't load " + name, ex);

             } finally {

                 try {

                     if (is != null) is.close();

                 } catch (IOException ex) {

                     throw new ClassNotFoundException(null, ex);

                 }

             }

         }

         return super.findClass(name);

     }

     protected abstract Fn defineFn(String code, String... names);

     protected abstract void loadScript(Reader code) throws Exception;

 }