RefConstant.java revision db267bc191f906f55eaef21a27110cce2ec57fdf 
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.constant;
22
23import proguard.classfile.*;
24import proguard.classfile.visitor.*;
25
26/**
27 * This Constant represents a ref constant in the constant pool.
28 *
29 * @author Eric Lafortune
30 */
31public abstract class RefConstant extends Constant
32{
33    public int u2classIndex;
34    public int u2nameAndTypeIndex;
35
36    /**
37     * An extra field pointing to the referenced Clazz object.
38     * This field is typically filled out by the <code>{@link
39     * proguard.classfile.util.ClassReferenceInitializer
40     * ClassReferenceInitializer}</code>.
41     */
42    public Clazz referencedClass;
43
44    /**
45     * An extra field optionally pointing to the referenced Member object.
46     * This field is typically filled out by the <code>{@link
47     * proguard.classfile.util.ClassReferenceInitializer
48     * ClassReferenceInitializer}</code>.
49     */
50    public Member referencedMember;
51
52
53    protected RefConstant()
54    {
55    }
56
57
58    /**
59     * Returns the class index.
60     */
61    public int getClassIndex()
62    {
63        return u2classIndex;
64    }
65
66    /**
67     * Returns the name-and-type index.
68     */
69    public int getNameAndTypeIndex()
70    {
71        return u2nameAndTypeIndex;
72    }
73
74    /**
75     * Sets the name-and-type index.
76     */
77    public void setNameAndTypeIndex(int index)
78    {
79        u2nameAndTypeIndex = index;
80    }
81
82    /**
83     * Returns the class name.
84     */
85    public String getClassName(Clazz clazz)
86    {
87        return clazz.getClassName(u2classIndex);
88    }
89
90    /**
91     * Returns the method/field name.
92     */
93    public String getName(Clazz clazz)
94    {
95        return clazz.getName(u2nameAndTypeIndex);
96    }
97
98    /**
99     * Returns the type.
100     */
101    public String getType(Clazz clazz)
102    {
103        return clazz.getType(u2nameAndTypeIndex);
104    }
105
106
107    /**
108     * Lets the referenced class accept the given visitor.
109     */
110    public void referencedClassAccept(ClassVisitor classVisitor)
111    {
112        if (referencedClass != null)
113        {
114            referencedClass.accept(classVisitor);
115        }
116    }
117
118
119    /**
120     * Lets the referenced class member accept the given visitor.
121     */
122    public void referencedMemberAccept(MemberVisitor memberVisitor)
123    {
124        if (referencedMember != null)
125        {
126            referencedMember.accept(referencedClass,
127                                    memberVisitor);
128        }
129    }
130}
131