ClassConstant.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.constant;
22
23import proguard.classfile.*;
24import proguard.classfile.constant.visitor.ConstantVisitor;
25import proguard.classfile.visitor.ClassVisitor;
26
27/**
28 * This Constant represents a class constant in the constant pool.
29 *
30 * @author Eric Lafortune
31 */
32public class ClassConstant extends Constant
33{
34    public int u2nameIndex;
35
36    /**
37     * An extra field pointing to the referenced Clazz object.
38     * This field is filled out by the <code>{@link
39     * proguard.classfile.util.ClassReferenceInitializer ClassReferenceInitializer}</code>.
40     */
41    public Clazz referencedClass;
42
43    /**
44     * An extra field pointing to the java.lang.Class Clazz object.
45     * This field is typically filled out by the <code>{@link
46     * proguard.classfile.util.ClassReferenceInitializer
47     * ClassReferenceInitializer}</code>..
48     */
49    public Clazz javaLangClassClass;
50
51
52    /**
53     * Creates an uninitialized ClassConstant.
54     */
55    public ClassConstant()
56    {
57    }
58
59
60    /**
61     * Creates a new ClassConstant with the given name index.
62     * @param u2nameIndex     the index of the name in the constant pool.
63     * @param referencedClass the referenced class.
64     */
65    public ClassConstant(int   u2nameIndex,
66                         Clazz referencedClass)
67    {
68        this.u2nameIndex     = u2nameIndex;
69        this.referencedClass = referencedClass;
70    }
71
72
73    /**
74     * Returns the name.
75     */
76    public String getName(Clazz clazz)
77    {
78        return clazz.getString(u2nameIndex);
79    }
80
81
82    // Implementations for Constant.
83
84    public int getTag()
85    {
86        return ClassConstants.CONSTANT_Class;
87    }
88
89    public void accept(Clazz clazz, ConstantVisitor constantVisitor)
90    {
91        constantVisitor.visitClassConstant(clazz, this);
92    }
93
94
95    /**
96     * Lets the referenced class accept the given visitor.
97     */
98    public void referencedClassAccept(ClassVisitor classVisitor)
99    {
100        if (referencedClass != null)
101        {
102            referencedClass.accept(classVisitor);
103        }
104    }
105}
106