/**

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

 *

 * Copyright 2013-2014 Oracle and/or its affiliates. All rights reserved.

 *

 * Oracle and Java are registered trademarks of Oracle and/or its affiliates.

 * Other names may be trademarks of their respective owners.

 *

 * The contents of this file are subject to the terms of either the GNU

 * General Public License Version 2 only ("GPL") or the Common

 * Development and Distribution License("CDDL") (collectively, the

 * "License"). You may not use this file except in compliance with the

 * License. You can obtain a copy of the License at

 * http://www.netbeans.org/cddl-gplv2.html

 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the

 * specific language governing permissions and limitations under the

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 * Notice in each file and include the License file at

 * nbbuild/licenses/CDDL-GPL-2-CP.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the GPL Version 2 section of the License file that

 * accompanied this code. If applicable, add the following below the

 * License Header, with the fields enclosed by brackets [] replaced by

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 * Contributor(s):

 *

 * The Original Software is NetBeans. The Initial Developer of the Original

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 * If you wish your version of this file to be governed by only the CDDL

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 * However, if you add GPL Version 2 code and therefore, elected the GPL

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package org.netbeans.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(Fn.ToJavaScript.class.getName())) {

            return Fn.ToJavaScript.class;

        }

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

            return Fn.FromJavaScript.class;

        }

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

            return FnUtils.class;

        }

        if (

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

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

            name.equals("org.netbeans.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;

                if (JsPkgCache.process(this, name)) {

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

                }

                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;

}