Coming back to MinecraftAPI

A long time for stop developing minecraft plugins due to busy about university and side works. Coming back from a long learning journey, i decide to recode my personal minecraft api for upcoming new server. Found that the code now i can build it with more structural design pattern. Such as MinecraftAPI interface class for runtime reloadable content.

package me.oska.core.abs;

public interface MinecraftAPI
{
    void register();
    void unregister();
    void intialise();
    void teardown();
}

Also i have updated my reader utility code for reading jar class with functional interface make it more flexible.

package me.oska.core.util;

import me.oska.core.OskaCore;
import me.oska.core.lambda.VoidAction;
import org.apache.commons.io.FilenameUtils;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;

public class ReaderUtil
{
    public static void readJAR(File folder, VoidAction<Class<?>> action)
    {
        for (File file : folder.listFiles())
        {
            if (file.isDirectory())
            {
                readJAR(file, action);
            }
            else if (file.isFile())
            {
                if (FilenameUtils.getExtension(file.getName()).equalsIgnoreCase("jar"))
                {
                    try
                    {
                        JarFile jarfile = new JarFile(file);
                        Enumeration<JarEntry> entry = jarfile.entries();
                        URL[] urls = { new URL("jar:file:" + file.getPath() + "!/") };
                        URLClassLoader cl = URLClassLoader.newInstance(urls, OskaCore.ins.getClass().getClassLoader());
                        while (entry.hasMoreElements())
                        {
                            JarEntry je = entry.nextElement();
                            if (je.isDirectory() || !je.getName().endsWith(".class"))
                            {
                                continue;
                            }
                            String classname = je.getName().substring(0, je.getName().length() - 6);
                            classname = classname.replace('/', '.');
                            Class clazz = Class.forName(classname, true, cl);

                            action.run(clazz);
                        }
                        cl.close();
                        jarfile.close();
                    }
                    catch (Exception ex)
                    {
                        OskaCore.ins.getLogger().severe("Fail when loading from '" + file.getName() + "'");
                        ex.printStackTrace();
                    }
                }
            }
        }
    }
}