import java.io.ByteArrayInputStream;

import java.io.FileInputStream;

public class Loader2 extends ClassLoader {

  int _recur;

  public void print( String msg ) {

    for( int i=0; i<_recur; i++ )

      System.out.print("  ");

    System.out.println(">>Loader2>> "+msg);

  }

  protected Class findClass2(String name) throws ClassNotFoundException {

    print("Fetching the implementation of "+name);

    int old = _recur;

    try {

      FileInputStream fi = new FileInputStream(name+".impl2");

      byte result[] = new byte[fi.available()];

      fi.read(result);

      print("DefineClass1 on "+name);

      _recur++;

      Class clazz = defineClass(name, result, 0, result.length);

      _recur = old;

      print("Returning newly loaded class.");

      return clazz;

    } catch (Exception e) {

      _recur = old;

      print("Not found on disk.");

      // If we caught an exception, either the class was not found or

      // it was unreadable by our process.

      return null;

      //throw new ClassNotFoundException(e.toString());

    }

  }

  protected synchronized Class loadClass(String name, boolean resolve) throws ClassNotFoundException  {

    // Attempt a disk load first

    Class c = findClass2(name);

    if( c == null ) {

      // check if the class has already been loaded

      print("Checking for prior loaded class "+name);

      c = findLoadedClass(name);

      print("Letting super-loader load "+name);

      int old = _recur;

      _recur++;

      c = super.loadClass(name, false);

      _recur=old;

    }

    if (resolve) { print("Resolving class "+name); resolveClass(c); }

    print("Returning clazz "+c.getClassLoader()+":"+name);

    return c;

  }

}