1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2009 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.*;
26
27/**
28 * This Attribute represents an enclosing method attribute.
29 *
30 * @author Eric Lafortune
31 */
32public class EnclosingMethodAttribute extends Attribute
33{
34    public int u2classIndex;
35    public int u2nameAndTypeIndex;
36
37    /**
38     * An extra field pointing to the referenced Clazz object.
39     * This field is typically filled out by the <code>{@link
40     * proguard.classfile.util.ClassReferenceInitializer
41     * ClassReferenceInitializer}</code>.
42     */
43    public Clazz referencedClass;
44
45    /**
46     * An extra field optionally pointing to the referenced Method object.
47     * This field is typically filled out by the <code>{@link
48     * proguard.classfile.util.ClassReferenceInitializer
49     * ClassReferenceInitializer}</code>.
50     */
51    public Method referencedMethod;
52
53
54    /**
55     * Creates an uninitialized EnclosingMethodAttribute.
56     */
57    public EnclosingMethodAttribute()
58    {
59    }
60
61
62    /**
63     * Creates an initialized EnclosingMethodAttribute.
64     */
65    public EnclosingMethodAttribute(int u2attributeNameIndex,
66                                    int u2classIndex,
67                                    int u2nameAndTypeIndex)
68    {
69        super(u2attributeNameIndex);
70
71        this.u2classIndex       = u2classIndex;
72        this.u2nameAndTypeIndex = u2nameAndTypeIndex;
73    }
74
75
76    /**
77     * Returns the class name.
78     */
79    public String getClassName(Clazz clazz)
80    {
81        return clazz.getClassName(u2classIndex);
82    }
83
84    /**
85     * Returns the method/field name.
86     */
87    public String getName(Clazz clazz)
88    {
89        return clazz.getName(u2nameAndTypeIndex);
90    }
91
92    /**
93     * Returns the type.
94     */
95    public String getType(Clazz clazz)
96    {
97        return clazz.getType(u2nameAndTypeIndex);
98    }
99
100
101    /**
102     * Lets the referenced class accept the given visitor.
103     */
104    public void referencedClassAccept(ClassVisitor classVisitor)
105    {
106        if (referencedClass != null)
107        {
108            referencedClass.accept(classVisitor);
109        }
110    }
111
112
113    /**
114     * Lets the referenced class member accept the given visitor.
115     */
116    public void referencedMethodAccept(MemberVisitor memberVisitor)
117    {
118        if (referencedMethod != null)
119        {
120            referencedMethod.accept(referencedClass,
121                                    memberVisitor);
122        }
123    }
124
125
126    // Implementations for Attribute.
127
128    public void accept(Clazz clazz, AttributeVisitor attributeVisitor)
129    {
130        attributeVisitor.visitEnclosingMethodAttribute(clazz, this);
131    }
132}
133