ClassTransformerAdapter


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.instrument.classloading.glassfish;
18  
19  import java.lang.instrument.ClassFileTransformer  ;
20  import java.lang.instrument.IllegalClassFormatException  ;
21  import java.security.ProtectionDomain  ;
22  
23  import javax.persistence.spi.ClassTransformer;
24  
25  /**
26   * Adapter that implements the JPA ClassTransformer interface (as required by GlassFish)
27   * based on a given JDK 1.5 ClassFileTransformer.
28   *
29   * @author Costin Leau
30   * @author Juergen Hoeller
31   * @since 2.0.1
32   */
33  class ClassTransformerAdapter implements ClassTransformer {
34  
35      private final ClassFileTransformer   classFileTransformer;
36  
37  
38      /**
39       * Build a new ClassTransformerAdapter for the given ClassFileTransformer.
40       * @param classFileTransformer the JDK 1.5 ClassFileTransformer to wrap
41       */
42      public ClassTransformerAdapter(ClassFileTransformer   classFileTransformer) {
43          this.classFileTransformer = classFileTransformer;
44      }
45  
46  
47      public byte[] transform(ClassLoader   loader, String   className, Class  <?> classBeingRedefined,
48              ProtectionDomain   protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException   {
49  
50          byte[] result = this.classFileTransformer.transform(
51                  loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
52  
53          // If no transformation was done, return null.
54          return (result == classfileBuffer ? null : result);
55      }
56  
57  }
58
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