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Java > Open Source Codes > proguard > classfile > editor > ExceptionAdder


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This program is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This program is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15  * more details.
16  *
17  * You should have received a copy of the GNU General Public License along
18  * with this program; if not, write to the Free Software Foundation, Inc.,
19  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.classfile.editor;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.ExceptionsAttribute;
25 import proguard.classfile.constant.ClassConstant;
26 import proguard.classfile.constant.visitor.ConstantVisitor;
27 import proguard.classfile.util.SimplifiedVisitor;
28
29 /**
30  * This ConstantVisitor adds all class constants that it visits to the given
31  * target exceptions attribute.
32  *
33  * @author Eric Lafortune
34  */
35 public class ExceptionAdder
36 extends SimplifiedVisitor
37 implements ConstantVisitor
38 {
39     private ExceptionsAttribute targetExceptionsAttribute;
40
41     private ConstantAdder constantAdder = new ConstantAdder();
42     private ExceptionsEditor exceptionsEditor = new ExceptionsEditor();
43
44
45     /**
46      * Creates a new MemberAdder that will copy methods into the given target
47      * class.
48      */
49   public ExceptionAdder(ProgramClass targetClass,
50                         ExceptionsAttribute targetExceptionsAttribute)
51     {
52         this.targetExceptionsAttribute = targetExceptionsAttribute;
53
54         constantAdder.setTargetClass(targetClass);
55     }
56
57
58     // Implementations for ConstantVisitor.
59
60     public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
61     {
62         constantAdder.visitClassConstant(clazz, classConstant);
63
64         exceptionsEditor.addException(targetExceptionsAttribute,
65                                       constantAdder.getConstantIndex());
66     }
67 }
68
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