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Java > Open Source Codes > org > apache > geronimo > transformer > TransformerCollection


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.transformer;
18
19 import java.lang.instrument.ClassFileTransformer JavaDoc;
20 import java.lang.instrument.IllegalClassFormatException JavaDoc;
21 import java.security.ProtectionDomain JavaDoc;
22 import java.util.List JavaDoc;
23 import java.util.ArrayList JavaDoc;
24 import java.util.Iterator JavaDoc;
25
26 /**
27  * @version $Rev: 476049 $ $Date: 2006-11-16 23:35:17 -0500 (Thu, 16 Nov 2006) $
28  */
29 public class TransformerCollection implements ClassFileTransformer JavaDoc {
30
31     private final List JavaDoc<ClassFileTransformer JavaDoc> transformers = new ArrayList JavaDoc<ClassFileTransformer JavaDoc>();
32
33     public byte[] transform(ClassLoader JavaDoc loader, String JavaDoc className, Class JavaDoc<?> classBeingRedefined, ProtectionDomain JavaDoc protectionDomain, byte[] classfileBuffer) throws IllegalClassFormatException JavaDoc {
34         boolean changed = false;
35         for (ClassFileTransformer JavaDoc transformer : transformers) {
36             byte[] transformed = transformer.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer);
37             if (transformed != null) {
38                 changed = true;
39                 classfileBuffer = transformed;
40             }
41         }
42         return changed? classfileBuffer: null;
43     }
44
45     public void addTransformer(ClassFileTransformer JavaDoc classFileTransformer) {
46         transformers.add(classFileTransformer);
47     }
48
49     public void removeTransformer(ClassFileTransformer JavaDoc classFileTransformer) {
50         transformers.remove(classFileTransformer);
51     }
52 }
53
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