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Java > Open Source Codes > javassist > convert > Transformer


1 /*
2  * Javassist, a Java-bytecode translator toolkit.
3  * Copyright (C) 1999-2005 Shigeru Chiba. All Rights Reserved.
4  *
5  * The contents of this file are subject to the Mozilla Public License Version
6  * 1.1 (the "License"); you may not use this file except in compliance with
7  * the License. Alternatively, the contents of this file may be used under
8  * the terms of the GNU Lesser General Public License Version 2.1 or later.
9  *
10  * Software distributed under the License is distributed on an "AS IS" basis,
11  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
12  * for the specific language governing rights and limitations under the
13  * License.
14  */
15
16 package javassist.convert;
17
18 import javassist.bytecode.*;
19 import javassist.CtClass;
20 import javassist.CannotCompileException;
21
22 /**
23  * Transformer and its subclasses are used for executing
24  * code transformation specified by CodeConverter.
25  *
26  * @see javassist.CodeConverter
27  */
28 public abstract class Transformer implements Opcode {
29     private Transformer next;
30
31     public Transformer(Transformer t) {
32         next = t;
33     }
34
35     public Transformer getNext() { return next; }
36
37     public void initialize(ConstPool cp, CodeAttribute attr) {}
38
39     public void clean() {}
40
41     public abstract int transform(CtClass clazz, int pos, CodeIterator it,
42                 ConstPool cp) throws CannotCompileException, BadBytecode;
43
44     public int extraLocals() { return 0; }
45 }
46
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