001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019 020 // 021 // This source code implements specifications defined by the Java 022 // Community Process. In order to remain compliant with the specification 023 // DO NOT add/change/or delete method signatures! 024 // 025 026 package javax.persistence.spi; 027 028 import java.security.ProtectionDomain; 029 import java.lang.instrument.IllegalClassFormatException; 030 031 /** 032 * @version $Rev: 467742 $ $Date: 2006-10-25 21:30:38 +0200 (Mi, 25. Okt 2006) $ 033 */ 034 public interface ClassTransformer { 035 /** 036 * Invoked when a class is being loaded or redefined. The implementation of this 037 * method may transform the supplied class file and return a new replacement class 038 * file. 039 * 040 * @param loader The defining loader of the class to be transformed, may be null if 041 * the bootstrap loader 042 * @param className The name of the class in the internal form of fully qualified 043 * class and interface names 044 * @param classBeingRedefined If this is a redefine, the class being redefined, 045 * otherwise null 046 * @param protectionDomain The protection domain of the class being defined or 047 * redefined 048 * @param classfileBuffer The input byte buffer in class file format - must not be 049 * modified 050 * @return A well-formed class file buffer (the result of the transform), or null if 051 * no transform is performed 052 * @throws java.lang.instrument.IllegalClassFormatException 053 * If the input does not represent a well-formed 054 * class file 055 */ 056 byte[] transform( 057 ClassLoader loader, 058 String className, 059 Class<?> classBeingRedefined, 060 ProtectionDomain protectionDomain, 061 byte[] classfileBuffer) throws IllegalClassFormatException; 062 063 }