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/* Copyright (C) 2005  Free Software Foundation
 
   This file is part of libgcj.
 
This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */
 
package gnu.gcj.runtime;
 
import java.io.IOException;
import java.net.URL;
import java.util.Enumeration;
 
/**
 * This is a helper for the bootstrap class loader.  It is a
 * URLClassLoader so that we can read a class path and re-use all the
 * existing code for finding classes, extracting them from jars, etc.
 * However, it is never called the way that an ordinary ClassLoader is
 * called.  For instance, loadClass() is never used.
 */
public final class BootClassLoader extends HelperClassLoader
{
  BootClassLoader(String libdir)
  {
    // The BootClassLoader is the top of the delegation chain. It does not
    // have a parent.
    super((ClassLoader) null);
    addDirectoriesFromProperty("java.endorsed.dirs");
    addDirectoriesFromProperty("gnu.gcj.runtime.endorsed.dirs");
 
    try
      {
	// Add core:/ to the end so any resources compiled into this
	// executable may be found.
	addURL(new URL("core", "", -1, "/"));
      }
    catch (java.net.MalformedURLException x)
      {
	// This should never happen.
	throw new RuntimeException(x);
      }
  }
 
  public Class bootLoadClass(String name)
    throws ClassNotFoundException
  {
    Class c = findLoadedClass(name);
    if (c == null)
      {
	try
	  {
	    // We could hack URLClassLoader to make this more
	    // efficient, if it mattered.
	    c = findClass(name);
	  }
	catch (ClassNotFoundException _)
	  {
	    c = null;
	  }
      }
    return c;
  }
 
  public URL bootGetResource(String name)
  {
    return findResource(name);
  }
 
  public Enumeration bootGetResources(String name) throws IOException
  {
    return findResources(name);
  }
}