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Java > Open Source Codes > net > sf > cglib > transform > hook > AbstractPreProcessor


1 /*
2  * Copyright 2003 The Apache Software Foundation
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 package net.sf.cglib.transform.hook;
17
18 import java.util.Hashtable JavaDoc;
19 import net.sf.cglib.core.*;
20 import net.sf.cglib.transform.*;
21 import org.codehaus.aspectwerkz.hook.ClassPreProcessor;
22 import org.objectweb.asm.ClassReader;
23 import org.objectweb.asm.ClassWriter;
24
25 abstract public class AbstractPreProcessor implements ClassPreProcessor {
26     public void initialize(Hashtable JavaDoc hashtable) {
27     }
28
29     public byte[] preProcess(String JavaDoc name, byte[] abyte, ClassLoader JavaDoc caller) {
30         try {
31             ClassTransformer t = getClassTransformer(name);
32             if (t == null)
33                 return abyte;
34             ClassWriter w = new DebuggingClassWriter(true);
35             ClassGenerator gen = new ClassReaderGenerator(new ClassReader(abyte), false);
36             gen = new TransformingClassGenerator(gen, t);
37             gen.generateClass(w);
38             return w.toByteArray();
39         } catch (Exception JavaDoc e) {
40             throw new CodeGenerationException(e);
41         }
42     }
43
44     abstract protected ClassTransformer getClassTransformer(String JavaDoc name);
45 }
46
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