1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2014 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.*;
25import proguard.classfile.attribute.visitor.BootstrapMethodInfoVisitor;
26
27/**
28 * This BootstrapMethodInfoVisitor adds all bootstrap methods that it visits to
29 * the given target class, creating a bootstrap methods attribute if necessary.
30 */
31public class BootstrapMethodsAttributeAdder
32implements   BootstrapMethodInfoVisitor
33{
34    private final ProgramClass             targetClass;
35    private final ConstantPoolEditor       constantPoolEditor;
36    private       BootstrapMethodInfoAdder bootstrapMethodInfoAdder;
37
38
39    /**
40     * Creates a new BootstrapMethodsAttributeAdder that will copy bootstrap
41     * methods into the given target class/
42     */
43    public BootstrapMethodsAttributeAdder(ProgramClass targetClass)
44    {
45        this.targetClass        = targetClass;
46        this.constantPoolEditor = new ConstantPoolEditor(targetClass);
47    }
48
49
50    /**
51     * Returns the index of the most recently added bootstrap method.
52     */
53    public int getBootstrapMethodIndex()
54    {
55        return bootstrapMethodInfoAdder.getBootstrapMethodIndex();
56    }
57
58
59    // Implementations for BootstrapMethodInfoVisitor.
60
61    public void visitBootstrapMethodInfo(Clazz clazz, BootstrapMethodInfo bootstrapMethodInfo)
62    {
63        // Make sure we have a bootstrap methods attribute adder.
64        if (bootstrapMethodInfoAdder == null)
65        {
66            // Make sure we have a target bootstrap methods attribute.
67            AttributesEditor attributesEditor =
68                new AttributesEditor(targetClass, false);
69
70            BootstrapMethodsAttribute targetBootstrapMethodsAttribute =
71                (BootstrapMethodsAttribute)attributesEditor.findAttribute(ClassConstants.ATTR_BootstrapMethods);
72
73            if (targetBootstrapMethodsAttribute == null)
74            {
75                targetBootstrapMethodsAttribute =
76                    new BootstrapMethodsAttribute(constantPoolEditor.addUtf8Constant(ClassConstants.ATTR_BootstrapMethods),
77                                                  0,
78                                                  new BootstrapMethodInfo[0]);
79
80                attributesEditor.addAttribute(targetBootstrapMethodsAttribute);
81            }
82
83            // Create a bootstrap method adder for it.
84            bootstrapMethodInfoAdder = new BootstrapMethodInfoAdder(targetClass,
85                                                                    targetBootstrapMethodsAttribute);
86        }
87
88        // Delegate to the bootstrap method adder.
89        bootstrapMethodInfoAdder.visitBootstrapMethodInfo(clazz, bootstrapMethodInfo);
90    }
91}