mirror of git://gcc.gnu.org/git/gcc.git
85 lines
3.6 KiB
Java
85 lines
3.6 KiB
Java
/* ClassFileTransformer.java -- Implementation of this interface is used by an agent to
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transform class files.
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Copyright (C) 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.lang.instrument;
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import java.security.ProtectionDomain;
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/**
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* This interface should be implemented by classes wishing to transform
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* classes bytecode when defining or redefining classes.
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*
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* @author Nicolas Geoffray (nicolas.geoffray@menlina.com)
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* @see Instrumentation
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* @see Instrumentation#addTransformer(java.lang.instrument.ClassFileTransformer)
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* @see Instrumentation#removeTransformer(java.lang.instrument.ClassFileTransformer)
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* @since 1.5
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*/
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public interface ClassFileTransformer
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{
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/**
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* Implementation of this method transforms a class by redefining its
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* bytecodes. Once a ClassFileTransformer object registers itself to the
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* Instrumentation object, this method will be called each time a class is
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* defined (<code>ClassLoader.defineClass</code>) or redefined
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* (<code>Instrumentation.redefineClasses</code>)
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* @param loader the loader of the class
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* @param className the name of the class with packages separated with "/"
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* @param classBeingRedefined the class being redefined if it's the case,
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* null otherwise
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* @param protectionDomain the protection domain of the class being defined or
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* redefined
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* @param classfileBuffer the input byte buffer in class file format
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*
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* @return a class file buffer or null when no transformation has been performed
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*
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* @throws IllegalClassFormatException if the byte buffer does not represent
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* a well-formed class file
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* @see Instrumentation#redefineClasses(java.lang.instrument.ClassDefinition[])
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*
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*/
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byte[] transform(ClassLoader loader,
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String className,
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Class<?> classBeingRedefined,
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ProtectionDomain protectionDomain,
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byte[] classfileBuffer)
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throws IllegalClassFormatException;
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}
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