libjava/gnu/gcj/runtime/SharedLibLoader.java

/* Copyright (C) 2001  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.util.Hashtable;

/**
 * A ClassLoader backed by a gcj-compiled shared library.
 * @author Per Bothner <per@bothner.com>, Brainfood Inc.
 */

public class SharedLibLoader extends ClassLoader
{
  public native void finalize ();

  /** Called during dlopen's processing of the init section. */
  void registerClass(String name, Class cls)
  {
    classMap.put(name, cls);
  }

  /** Load a shared library, and associate a ClassLoader with it.
   * @param libname named of shared library (passed to dlopen)
   * @param parent the parent ClassLoader
   * @parem flags passed to dlopen
   */
  public SharedLibLoader(String libname, ClassLoader parent, int flags)
  {
    super(parent);
    init(libname, flags);
  }


  /** Load a shared library, and asociate a ClassLoader with it.
   * @param libname named of shared library (passed to dlopen)
   */
  public SharedLibLoader(String libname)
  {
    super(getSystemClassLoader());
    init(libname, 0);
  }

  void init(String libname, int flags)
  {
    init(libname.getBytes(), flags);
  }

  native void init(byte[] libname, int flags);

  public Class loadClass(String name)
    throws ClassNotFoundException
  {
    return super.loadClass(name);
  }

  public Class findClass(String name)
    throws ClassNotFoundException
  {
    Object cls = classMap.get(name);
    if (cls == null)
      throw new ClassNotFoundException(name);
    return (Class) cls;
  }

  /** The handle returned by dlopen. */
  gnu.gcj.RawData handler;

  /** Map classnames to Classes. */
  Hashtable classMap = new Hashtable(20);
}