http://www.javassist.org/: Javassist (JAVA programming ASSISTant) makes Java bytecode manipulation simple. It is a class library for editing bytecodes in Java. (Shigeru Chiba, www.javassist.org) 
/*
 * Javassist, a Java-bytecode translator toolkit.
 * Copyright (C) 1999- Shigeru Chiba. All Rights Reserved.
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License.  Alternatively, the contents of this file may be used under
 * the terms of the GNU Lesser General Public License Version 2.1 or later,
 * or the Apache License Version 2.0.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 */

package javassist.tools.reflect;


An interface to access a metaobject and a class metaobject.
This interface is implicitly implemented by the reflective
class.

/**
 * An interface to access a metaobject and a class metaobject.
 * This interface is implicitly implemented by the reflective
 * class.
 */
public interface Metalevel {
    
Obtains the class metaobject associated with this object.

/**
     * Obtains the class metaobject associated with this object.
     */
    ClassMetaobject _getClass();

    
Obtains the metaobject associated with this object.

/**
     * Obtains the metaobject associated with this object.
     */
    Metaobject _getMetaobject();

    
Changes the metaobject associated with this object.

/**
     * Changes the metaobject associated with this object.
     */
    void _setMetaobject(Metaobject m);
}