| /* |
| * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.misc; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * This is an abstract base class which is called by java.lang.ClassLoader |
| * when ClassFormatError is thrown inside defineClass(). |
| * |
| * The purpose of this class is to allow applications (e.g. Java Plug-in) |
| * to have a chance to transform the byte code from one form to another |
| * if necessary. |
| * |
| * One application of this class is used by Java Plug-in to transform |
| * malformed JDK 1.1 class file into a well-formed Java 2 class file |
| * on-the-fly, so JDK 1.1 applets with malformed class file in the |
| * Internet may run in Java 2 after transformation. |
| * |
| * @author Stanley Man-Kit Ho |
| */ |
| |
| public abstract class ClassFileTransformer |
| { |
| // Singleton of ClassFileTransformer |
| // |
| private static ArrayList<ClassFileTransformer> transformerList |
| = new ArrayList<ClassFileTransformer>(); |
| private static ClassFileTransformer[] transformers |
| = new ClassFileTransformer[0]; |
| |
| /** |
| * Add the class file transformer object. |
| * |
| * @param t Class file transformer instance |
| */ |
| public static void add(ClassFileTransformer t) |
| { |
| synchronized(transformerList) |
| { |
| transformerList.add(t); |
| transformers = transformerList.toArray(new ClassFileTransformer[0]); |
| } |
| } |
| |
| /** |
| * Get the array of ClassFileTransformer object. |
| * |
| * @return ClassFileTransformer object array |
| */ |
| public static ClassFileTransformer[] getTransformers() |
| { |
| // transformers is not intended to be changed frequently, |
| // so it is okay to not put synchronized block here |
| // to speed up performance. |
| // |
| return transformers; |
| } |
| |
| |
| /** |
| * Transform a byte array from one to the other. |
| * |
| * @param b Byte array |
| * @param off Offset |
| * @param len Length of byte array |
| * @return Transformed byte array |
| */ |
| public abstract byte[] transform(byte[] b, int off, int len) |
| throws ClassFormatError; |
| } |