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.attribute;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.visitor.AttributeVisitor;
25import proguard.classfile.visitor.ClassVisitor;
26
27/**
28 * This Attribute represents a signature attribute.
29 *
30 * @author Eric Lafortune
31 */
32public class SignatureAttribute extends Attribute
33{
34    public int u2signatureIndex;
35
36    /**
37     * An extra field pointing to the Clazz objects referenced in the
38     * signature string. This field is filled out by the <code>{@link
39     * proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}</code>.
40     * References to primitive types are ignored.
41     */
42    public Clazz[] referencedClasses;
43
44
45    /**
46     * Creates an uninitialized SignatureAttribute.
47     */
48    public SignatureAttribute()
49    {
50    }
51
52
53    /**
54     * Creates an initialized SignatureAttribute.
55     */
56    public SignatureAttribute(int u2attributeNameIndex,
57                              int u2signatureIndex)
58    {
59        super(u2attributeNameIndex);
60
61        this.u2signatureIndex = u2signatureIndex;
62    }
63
64
65    /**
66     * Returns the signature.
67     */
68    public String getSignature(Clazz clazz)
69    {
70        return clazz.getString(u2signatureIndex);
71    }
72
73
74    /**
75     * Lets the Clazz objects referenced in the signature string accept the
76     * given visitor.
77     */
78    public void referencedClassesAccept(ClassVisitor classVisitor)
79    {
80        if (referencedClasses != null)
81        {
82            for (int index = 0; index < referencedClasses.length; index++)
83            {
84                if (referencedClasses[index] != null)
85                {
86                    referencedClasses[index].accept(classVisitor);
87                }
88            }
89        }
90    }
91
92
93    // Implementations for Attribute.
94
95    public void accept(Clazz clazz, AttributeVisitor attributeVisitor)
96    {
97        attributeVisitor.visitSignatureAttribute(clazz, this);
98    }
99
100    public void accept(Clazz clazz, Field field, AttributeVisitor attributeVisitor)
101    {
102        attributeVisitor.visitSignatureAttribute(clazz, field, this);
103    }
104
105    public void accept(Clazz clazz, Method method, AttributeVisitor attributeVisitor)
106    {
107        attributeVisitor.visitSignatureAttribute(clazz, method, this);
108    }
109 }
110