public NationClassLoader(URL[] urls, Vector nations) {
super(urls);
for (int i = 0; i < urls.length; i++) {
file = urls[i].getFile();
fileTmp = new File(file);
System.out.println(
"NationClassLoader - Does " + fileTmp.toString() + " exists : " + fileTmp.exists());
name = file.substring(file.lastIndexOf("/") + 1, file.lastIndexOf("."));
runtimeObject = null;
try {
jarLoader = URLClassLoader.newInstance(new URL[] {urls[i]});
System.out.println(
"NationClassLoader - JARloader trying : " + jarLoader.getURLs()[0].toString());
runtimeObject = jarLoader.loadClass(name + "/" + name).newInstance();
} catch (Exception e) {
System.err.println("NationClassLoader - Stinking error : " + e);
}
if (runtimeObject != null) {
natFile = (nationFile2) runtimeObject;
nations.addElement(natFile);
}
}
}
/**
* Method to create concrete instances of this abstract class. Instances are dynamically loaded.
* Instances's names are obtained by concatenating a prefix, either "Light", "Regular", or
* "Gourmet", with the suffix "PizzaFactory".
*
* @param style An integer representing the style of pizzas to create, e.g., 0 stands for
* "Light". @ @return a concrete pizza factory
*/
static AbstractPizzaFactory getFactory(int style)
throws ClassNotFoundException, InstantiationException, IllegalAccessException,
IllegalArgumentException, MalformedURLException {
if (0 <= style && style <= prefix.length - 1) {
// Alternative #1 - load from current directory
// AbstractPizzaFactory apf =
// (AbstractPizzaFactory) Class.forName
// (prefix [style] + suffix).newInstance ();
// Alternative 2 - load from URL (including JAR file)
// It looks like only the protocol "file:" is
// required to load files from the execution directory
URL[] classPath = {new URL("file:")};
URLClassLoader classLoader = new URLClassLoader(classPath);
String name = prefix[style] + suffix;
Class someClass = classLoader.loadClass(name);
AbstractPizzaFactory apf = (AbstractPizzaFactory) someClass.newInstance();
// end of alternatives
return apf;
} else throw new IllegalArgumentException();
}
