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Java > Open Source Codes > proguard > classfile > util > ClassSubHierarchyInitializer


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 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  */
21 package proguard.classfile.util;
22
23 import proguard.classfile.visitor.ClassVisitor;
24 import proguard.classfile.constant.visitor.ConstantVisitor;
25 import proguard.classfile.constant.ClassConstant;
26 import proguard.classfile.*;
27
28 /**
29  * This ClassVisitor adds all classes that it visits to the list of subclasses
30  * of their superclass. These subclass lists make it more convenient to travel
31  *
32  * @author Eric Lafortune
33  */
34 public class ClassSubHierarchyInitializer
35 implements ClassVisitor
36 {
37     // Implementations for ClassVisitor.
38
39     public void visitProgramClass(ProgramClass programClass)
40     {
41         // Add this class to the subclasses of its superclass.
42 addSubclass(programClass, programClass.getSuperClass());
43
44         // Add this class to the subclasses of its interfaces.
45 for (int index = 0; index < programClass.u2interfacesCount; index++)
46         {
47             addSubclass(programClass, programClass.getInterface(index));
48         }
49     }
50
51
52     public void visitLibraryClass(LibraryClass libraryClass)
53     {
54         // Add this class to the subclasses of its superclass,
55 addSubclass(libraryClass, libraryClass.superClass);
56
57         // Add this class to the subclasses of its interfaces.
58 Clazz[] interfaceClasses = libraryClass.interfaceClasses;
59         if (interfaceClasses != null)
60         {
61             for (int index = 0; index < interfaceClasses.length; index++)
62             {
63                 // Add this class to the subclasses of the interface class.
64 addSubclass(libraryClass, interfaceClasses[index]);
65             }
66         }
67     }
68
69
70     // Small utility methods.
71
72     private void addSubclass(Clazz subclass, Clazz clazz)
73     {
74         if (clazz != null)
75         {
76             clazz.addSubClass(subclass);
77         }
78     }
79 }
80
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