MultiClassPoolVisitor.java revision b72c5c2e5482cf10117b2b25f642f7616b2326c3 
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.visitor;
22
23import proguard.classfile.ClassPool;
24
25
26/**
27 * This ClassPoolVisitor delegates all visits to each ClassPoolVisitor
28 * in a given list.
29 *
30 * @author Eric Lafortune
31 */
32public class MultiClassPoolVisitor implements ClassPoolVisitor
33{
34    private static final int ARRAY_SIZE_INCREMENT = 5;
35
36    private ClassPoolVisitor[] classPoolVisitors;
37    private int                classPoolVisitorCount;
38
39
40    public MultiClassPoolVisitor()
41    {
42    }
43
44
45    public MultiClassPoolVisitor(ClassPoolVisitor[] classPoolVisitors)
46    {
47        this.classPoolVisitors     = classPoolVisitors;
48        this.classPoolVisitorCount = classPoolVisitors.length;
49    }
50
51
52    public void addClassPoolVisitor(ClassPoolVisitor classPoolVisitor)
53    {
54        ensureArraySize();
55
56        classPoolVisitors[classPoolVisitorCount++] = classPoolVisitor;
57    }
58
59
60    private void ensureArraySize()
61    {
62        if (classPoolVisitors == null)
63        {
64            classPoolVisitors = new ClassPoolVisitor[ARRAY_SIZE_INCREMENT];
65        }
66        else if (classPoolVisitors.length == classPoolVisitorCount)
67        {
68            ClassPoolVisitor[] newClassPoolVisitors =
69                new ClassPoolVisitor[classPoolVisitorCount +
70                                     ARRAY_SIZE_INCREMENT];
71            System.arraycopy(classPoolVisitors, 0,
72                             newClassPoolVisitors, 0,
73                             classPoolVisitorCount);
74            classPoolVisitors = newClassPoolVisitors;
75        }
76    }
77
78
79    // Implementations for ClassPoolVisitor.
80
81    public void visitClassPool(ClassPool classPool)
82    {
83        for (int index = 0; index < classPoolVisitorCount; index++)
84        {
85            classPoolVisitors[index].visitClassPool(classPool);
86        }
87    }
88}
89