Subversion Repositories scarts

/* 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);

  }

}