Subversion Repositories openrisc

/* ClassFileTransformer.java -- Implementation of this interface is used by an agent to

   transform class files.

   Copyright (C) 2005  Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify

it under the terms of the GNU General Public License as published by

the Free Software Foundation; either version 2, or (at your option)

any later version.

GNU Classpath is distributed in the hope that it will be useful, but

WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

General Public License for more details.

You should have received a copy of the GNU General Public License

along with GNU Classpath; see the file COPYING.  If not, write to the

Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

02110-1301 USA.

Linking this library statically or dynamically with other modules is

making a combined work based on this library.  Thus, the terms and

conditions of the GNU General Public License cover the whole

combination.

As a special exception, the copyright holders of this library give you

permission to link this library with independent modules to produce an

executable, regardless of the license terms of these independent

modules, and to copy and distribute the resulting executable under

terms of your choice, provided that you also meet, for each linked

independent module, the terms and conditions of the license of that

module.  An independent module is a module which is not derived from

or based on this library.  If you modify this library, you may extend

this exception to your version of the library, but you are not

obligated to do so.  If you do not wish to do so, delete this

exception statement from your version. */

package java.lang.instrument;

import java.security.ProtectionDomain;

/**

 * This interface should be implemented by classes wishing to transform

 * classes bytecode when defining or redefining classes.

 *

 * @author Nicolas Geoffray (nicolas.geoffray@menlina.com)

 * @see Instrumentation

 * @see Instrumentation#addTransformer(java.lang.instrument.ClassFileTransformer)

 * @see Instrumentation#removeTransformer(java.lang.instrument.ClassFileTransformer)

 * @since 1.5

 */

public interface ClassFileTransformer

{

  /**

   * Implementation of this method transforms a class by redefining its

   * bytecodes. Once a ClassFileTransformer object registers itself to the

   * Instrumentation object, this method will be called each time a class is

   * defined (<code>ClassLoader.defineClass</code>) or redefined

   * (<code>Instrumentation.redefineClasses</code>)

   * @param loader the loader of the class

   * @param className the name of the class with packages separated with "/"

   * @param classBeingRedefined the class being redefined if it's the case,

   * null otherwise

   * @param protectionDomain the protection domain of the class being defined or

   * redefined

   * @param classfileBuffer the input byte buffer in class file format

   *

   * @return a class file buffer or null when no transformation has been performed

   *

   * @throws IllegalClassFormatException if the byte buffer does not represent

   * a well-formed class file

   * @see Instrumentation#redefineClasses(java.lang.instrument.ClassDefinition[])

   *

   */

  byte[] transform(ClassLoader loader,

                 String className,

                 Class<?> classBeingRedefined,

                 ProtectionDomain protectionDomain,

                 byte[] classfileBuffer)

                 throws IllegalClassFormatException;

}