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Java > Open Source Codes > org > apache > geronimo > persistence > TransformerWrapper


1 /**
2  * Licensed to the Apache Software Foundation (ASF) under one or more
3  * contributor license agreements. See the NOTICE file distributed with
4  * this work for additional information regarding copyright ownership.
5  * The ASF licenses this file to You under the Apache License, Version 2.0
6  * (the "License"); you may not use this file except in compliance with
7  * the License. You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 package org.apache.geronimo.persistence;
18
19 import java.lang.instrument.ClassFileTransformer JavaDoc;
20 import java.lang.instrument.IllegalClassFormatException JavaDoc;
21 import java.security.ProtectionDomain JavaDoc;
22
23 import javax.persistence.spi.ClassTransformer;
24
25 /**
26  * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
27  */
28 public class TransformerWrapper implements ClassFileTransformer JavaDoc {
29
30     private final ClassTransformer classTransformer;
31     private final ClassLoader JavaDoc classLoader;
32
33     public TransformerWrapper(ClassTransformer classTransformer, ClassLoader JavaDoc classLoader) {
34         this.classTransformer = classTransformer;
35         this.classLoader = classLoader;
36     }
37
38     public byte[] transform(ClassLoader JavaDoc loader, String JavaDoc className, Class JavaDoc<?> classBeingRedefined, ProtectionDomain JavaDoc protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException JavaDoc {
39         if (loader != classLoader) {
40             return null;
41         }
42         try {
43             return classTransformer.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
44         } catch (IllegalClassFormatException JavaDoc e) {
45             throw e;
46         } catch (RuntimeException JavaDoc e) {
47             return null;
48         }
49     }
50 }
51
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