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Java > Open Source Codes > net > sf > retrotranslator > transformer > JRockitJITRetrotranslator


1 /***
2  * Retrotranslator: a Java bytecode transformer that translates Java classes
3  * compiled with JDK 5.0 into classes that can be run on JVM 1.4.
4  *
5  * Copyright (c) 2005 - 2007 Taras Puchko
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  * notice, this list of conditions and the following disclaimer in the
15  * documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the copyright holders nor the names of its
17  * contributors may be used to endorse or promote products derived from
18  * this software without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
30  * THE POSSIBILITY OF SUCH DAMAGE.
31  */
32 package net.sf.retrotranslator.transformer;
33
34 /**
35  * @author Taras Puchko
36  */
37 class JRockitJITRetrotranslator {
38
39     private static class ClassPreProcessorImpl implements ClassPreProcessor {
40
41         private final ClassTransformer transformer;
42         private final ClassPreProcessor delegate;
43
44         public ClassPreProcessorImpl(ClassTransformer transformer, ClassPreProcessor delegate) {
45             this.transformer = transformer;
46             this.delegate = delegate;
47         }
48
49         public byte[] preProcess(ClassLoader JavaDoc classLoader, String JavaDoc string, byte[] bytes) {
50             bytes = transformer.transform(bytes, 0, bytes.length);
51             return delegate != null ? delegate.preProcess(classLoader, string, bytes) : bytes;
52         }
53     }
54
55     public static void install(ClassTransformer transformer) {
56         try {
57             Class JavaDoc jvmFactoryClass = Class.forName("com.bea.jvm.JVMFactory");
58             Object JavaDoc jvm = jvmFactoryClass.getMethod("getJVM").invoke(null);
59             Object JavaDoc classLibrary = jvm.getClass().getMethod("getClassLibrary").invoke(jvm);
60             ClassPreProcessor preProcessor = (ClassPreProcessor)
61                     classLibrary.getClass().getMethod("getClassPreProcessor").invoke(classLibrary);
62             if (!(preProcessor instanceof ClassPreProcessorImpl)) {
63                 classLibrary.getClass().getMethod("setClassPreProcessor", ClassPreProcessor.class).
64                         invoke(classLibrary, new ClassPreProcessorImpl(transformer, preProcessor));
65             }
66         } catch (Throwable JavaDoc e) {
67             // ignore
68 }
69     }
70 }
71
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