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Java > Open Source Codes > proguard > classfile > visitor > MultiClassVisitor


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.visitor;
22
23 import proguard.classfile.*;
24
25
26 /**
27  * This ClassVisitor delegates all visits to each ClassVisitor
28  * in a given list.
29  *
30  * @author Eric Lafortune
31  */
32 public class MultiClassVisitor implements ClassVisitor
33 {
34     private static final int ARRAY_SIZE_INCREMENT = 5;
35
36     private ClassVisitor[] classVisitors;
37     private int classVisitorCount;
38
39
40     public MultiClassVisitor()
41     {
42     }
43
44
45     public MultiClassVisitor(ClassVisitor[] classVisitors)
46     {
47         this.classVisitors = classVisitors;
48         this.classVisitorCount = classVisitors.length;
49     }
50
51
52     public void addClassVisitor(ClassVisitor classVisitor)
53     {
54         ensureArraySize();
55
56         classVisitors[classVisitorCount++] = classVisitor;
57     }
58
59
60     private void ensureArraySize()
61     {
62         if (classVisitors == null)
63         {
64             classVisitors = new ClassVisitor[ARRAY_SIZE_INCREMENT];
65         }
66         else if (classVisitors.length == classVisitorCount)
67         {
68             ClassVisitor[] newClassVisitors =
69                 new ClassVisitor[classVisitorCount +
70                                      ARRAY_SIZE_INCREMENT];
71             System.arraycopy(classVisitors, 0,
72                              newClassVisitors, 0,
73                              classVisitorCount);
74             classVisitors = newClassVisitors;
75         }
76     }
77
78
79     // Implementations for ClassVisitor.
80
81     public void visitProgramClass(ProgramClass programClass)
82     {
83         for (int index = 0; index < classVisitorCount; index++)
84         {
85             classVisitors[index].visitProgramClass(programClass);
86         }
87     }
88
89
90     public void visitLibraryClass(LibraryClass libraryClass)
91     {
92         for (int index = 0; index < classVisitorCount; index++)
93         {
94             classVisitors[index].visitLibraryClass(libraryClass);
95         }
96     }
97 }
98
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