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| 1 | /* | ||
| 2 | * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package sun.misc; | ||
| 26 | |||
| 27 | import java.util.ArrayList; | ||
| 28 | |||
| 29 | /** | ||
| 30 | * This is an abstract base class which is called by java.lang.ClassLoader | ||
| 31 | * when ClassFormatError is thrown inside defineClass(). | ||
| 32 | * | ||
| 33 | * The purpose of this class is to allow applications (e.g. Java Plug-in) | ||
| 34 | * to have a chance to transform the byte code from one form to another | ||
| 35 | * if necessary. | ||
| 36 | * | ||
| 37 | * One application of this class is used by Java Plug-in to transform | ||
| 38 | * malformed JDK 1.1 class file into a well-formed Java 2 class file | ||
| 39 | * on-the-fly, so JDK 1.1 applets with malformed class file in the | ||
| 40 | * Internet may run in Java 2 after transformation. | ||
| 41 | * | ||
| 42 | * @author Stanley Man-Kit Ho | ||
| 43 | */ | ||
| 44 | |||
| 45 | public abstract class ClassFileTransformer | ||
| 46 | { | ||
| 47 | // Singleton of ClassFileTransformer | ||
| 48 | // | ||
| 49 | private static ArrayList<ClassFileTransformer> transformerList | ||
| 50 | = new ArrayList<ClassFileTransformer>(); | ||
| 51 | private static ClassFileTransformer[] transformers | ||
| 52 | = new ClassFileTransformer[0]; | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Add the class file transformer object. | ||
| 56 | * | ||
| 57 | * @param t Class file transformer instance | ||
| 58 | */ | ||
| 59 | public static void add(ClassFileTransformer t) | ||
| 60 | { | ||
| 61 | synchronized(transformerList) | ||
| 62 | { | ||
| 63 | transformerList.add(t); | ||
| 64 | transformers = transformerList.toArray(new ClassFileTransformer[0]); | ||
| 65 | } | ||
| 66 | } | ||
| 67 | |||
| 68 | /** | ||
| 69 | * Get the array of ClassFileTransformer object. | ||
| 70 | * | ||
| 71 | * @return ClassFileTransformer object array | ||
| 72 | */ | ||
| 73 | public static ClassFileTransformer[] getTransformers() | ||
| 74 | { | ||
| 75 | // transformers is not intended to be changed frequently, | ||
| 76 | // so it is okay to not put synchronized block here | ||
| 77 | // to speed up performance. | ||
| 78 | // | ||
| 79 | return transformers; | ||
| 80 | } | ||
| 81 | |||
| 82 | |||
| 83 | /** | ||
| 84 | * Transform a byte array from one to the other. | ||
| 85 | * | ||
| 86 | * @param b Byte array | ||
| 87 | * @param off Offset | ||
| 88 | * @param len Length of byte array | ||
| 89 | * @return Transformed byte array | ||
| 90 | */ | ||
| 91 | public abstract byte[] transform(byte[] b, int off, int len) | ||
| 92 | throws ClassFormatError; | ||
| 93 | } | ||