ExceptionAdder.java revision b9cc48a43ed984587c939d02fba5316bf5c0df6e 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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 */
21package proguard.classfile.editor;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.ExceptionsAttribute;
25import proguard.classfile.constant.ClassConstant;
26import proguard.classfile.constant.visitor.ConstantVisitor;
27import 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 */
35public class ExceptionAdder
36extends      SimplifiedVisitor
37implements   ConstantVisitor
38{
39    private final ConstantAdder             constantAdder;
40    private final ExceptionsAttributeEditor exceptionsAttributeEditor;
41
42
43    /**
44     * Creates a new ExceptionAdder that will copy classes into the given
45     * target exceptions attribute.
46     */
47    public ExceptionAdder(ProgramClass        targetClass,
48                          ExceptionsAttribute targetExceptionsAttribute)
49    {
50        constantAdder             = new ConstantAdder(targetClass);
51        exceptionsAttributeEditor = new ExceptionsAttributeEditor(targetExceptionsAttribute);
52    }
53
54
55    // Implementations for ConstantVisitor.
56
57    public void visitClassConstant(Clazz clazz, ClassConstant classConstant)
58    {
59        // Add a class constant to the constant pool.
60        constantAdder.visitClassConstant(clazz, classConstant);
61
62        // Add the index of the class constant to the list of exceptions.
63        exceptionsAttributeEditor.addException(constantAdder.getConstantIndex());
64    }
65}
66