/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

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

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

import java.io.File;

import java.io.IOException;

import java.net.URL;

import java.nio.file.Files;

import java.security.AllPermission;

import java.security.Permissions;

import java.security.ProtectionDomain;

/**

 * A custom ClassLoader to load the concrete LoggerFinder class

 * with all permissions.

 *

 * @author danielfuchs

 */

public class CustomSystemClassLoader extends ClassLoader {

    public CustomSystemClassLoader() {

        super();

    }

    public CustomSystemClassLoader(ClassLoader parent) {

        super(parent);

    }

    private Class<?> defineFinderClass(String name)

        throws ClassNotFoundException {

        final Object obj = getClassLoadingLock(name);

        synchronized(obj) {

            if (loggerFinderClass != null) return loggerFinderClass;

            URL url = this.getClass().getProtectionDomain().getCodeSource().getLocation();

            File file = new File(url.getPath(), name+".class");

            if (file.canRead()) {

                try {

                    byte[] b = Files.readAllBytes(file.toPath());

                    Permissions perms = new Permissions();

                    perms.add(new AllPermission());

                    loggerFinderClass = defineClass(

                            name, b, 0, b.length, new ProtectionDomain(

                            this.getClass().getProtectionDomain().getCodeSource(),

                            perms));

                    System.out.println("Loaded " + name);

                    return loggerFinderClass;

                } catch (Throwable ex) {

                    ex.printStackTrace();

                    throw new ClassNotFoundException(name, ex);

                }

            } else {

                throw new ClassNotFoundException(name,

                        new IOException(file.toPath() + ": can't read"));

            }

        }

    }

    @Override

    public synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {

            Class<?> c = defineFinderClass(name);

            if (resolve) {

                resolveClass(c);

            }

            return c;

        }

        return super.loadClass(name, resolve);

    }

    @Override

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

            return defineFinderClass(name);

        }

        return super.findClass(name);

    }

}