69 lines
1.7 KiB
Java
69 lines
1.7 KiB
Java
/**
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* ServerFactory -- Praktikum Experimentierkasten --
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*
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* @author K. Rege
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* @version 1.0 -- Factory zur Erstellung von Server Objekten
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* @version 2.0 -- Dynamisches Nachladen
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*/
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package ch.zhaw.ads;
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import java.io.*;
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/* Classloader that handles file path of class
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*/
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class MyClassLoader extends ClassLoader {
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private String path;
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MyClassLoader(ClassLoader parent) {
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super(parent);
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}
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private byte[] getBytes(String name) {
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try {
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RandomAccessFile file = new RandomAccessFile(name, "r");
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byte data[] = new byte[(int) file.length()];
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file.readFully(data);
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file.close();
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return data;
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} catch (IOException e) {}
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return null;
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}
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/**
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* @name filename of class
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*/
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public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
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// System.out.println("load:" + name + " " + resolve);
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Class<?> clazz;
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byte[] classData = getBytes(name);
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if (classData != null) {
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clazz = defineClass(classData, 0, classData.length);
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path = name.substring(0,
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name.length() - clazz.getName().length() - ".class".length());
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return clazz;
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}
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if (!resolve) {
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classData = getBytes(path + name.replace(".", File.separator) + ".class");
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if (classData != null) {
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return defineClass(classData, 0, classData.length);
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}
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}
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return findSystemClass(name);
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}
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}
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public class ServerFactory {
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public static Class<?> loadClass(String name) throws Exception {
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MyClassLoader myClassLoader = new MyClassLoader(
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MyClassLoader.class.getClassLoader());
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Class<?> clazz = myClassLoader.loadClass(name, true);
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return clazz;
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}
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public static CommandExecutor createServer(String name) throws Exception {
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return (CommandExecutor) loadClass(name).newInstance();
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}
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}
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