1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* $Id: MemberInfoAccessFilter.java,v 1.7 2005/06/11 13:13:15 eric Exp $
*
* ProGuard -- shrinking, optimization, and obfuscation of Java class files.
*
* Copyright (c) 2002-2005 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.classfile.visitor;
import proguard.classfile.*;
/**
* This <code>MemberInfoVisitor</code> delegates its visits to another given
* <code>MemberInfoVisitor</code>, but only when the visited member
* has the proper access flags.
* <p>
* If conflicting access flags (public/private/protected) are specified,
* having one of them set will be considered sufficient.
*
* @see ClassConstants
*
* @author Eric Lafortune
*/
public class MemberInfoAccessFilter
implements MemberInfoVisitor
{
// A mask of conflicting access flags. These are interpreted in a special
// way if more of them are required at the same time. In that case, one
// of them being set is sufficient.
private static final int ACCESS_MASK =
ClassConstants.INTERNAL_ACC_PUBLIC |
ClassConstants.INTERNAL_ACC_PRIVATE |
ClassConstants.INTERNAL_ACC_PROTECTED;
private int requiredSetAccessFlags;
private int requiredUnsetAccessFlags;
private int requiredOneSetAccessFlags;
private MemberInfoVisitor memberInfoVisitor;
/**
* Creates a new MemberInfoAccessFilter.
* @param requiredSetAccessFlags the class access flags that should be
* set.
* @param requiredUnsetAccessFlags the class access flags that should be
* unset.
* @param memberInfoVisitor the <code>MemberInfoVisitor</code> to
* which visits will be delegated.
*/
public MemberInfoAccessFilter(int requiredSetAccessFlags,
int requiredUnsetAccessFlags,
MemberInfoVisitor memberInfoVisitor)
{
this.requiredSetAccessFlags = requiredSetAccessFlags & ~ACCESS_MASK;
this.requiredUnsetAccessFlags = requiredUnsetAccessFlags;
this.requiredOneSetAccessFlags = requiredSetAccessFlags & ACCESS_MASK;
this.memberInfoVisitor = memberInfoVisitor;
}
// Implementations for MemberInfoVisitor.
public void visitProgramFieldInfo(ProgramClassFile programClassFile, ProgramFieldInfo programFieldInfo)
{
if (accepted(programFieldInfo.getAccessFlags()))
{
memberInfoVisitor.visitProgramFieldInfo(programClassFile, programFieldInfo);
}
}
public void visitProgramMethodInfo(ProgramClassFile programClassFile, ProgramMethodInfo programMethodInfo)
{
if (accepted(programMethodInfo.getAccessFlags()))
{
memberInfoVisitor.visitProgramMethodInfo(programClassFile, programMethodInfo);
}
}
public void visitLibraryFieldInfo(LibraryClassFile libraryClassFile, LibraryFieldInfo libraryFieldInfo)
{
if (accepted(libraryFieldInfo.getAccessFlags()))
{
memberInfoVisitor.visitLibraryFieldInfo(libraryClassFile, libraryFieldInfo);
}
}
public void visitLibraryMethodInfo(LibraryClassFile libraryClassFile, LibraryMethodInfo libraryMethodInfo)
{
if (accepted(libraryMethodInfo.getAccessFlags()))
{
memberInfoVisitor.visitLibraryMethodInfo(libraryClassFile, libraryMethodInfo);
}
}
// Small utility methods.
private boolean accepted(int accessFlags)
{
return (requiredSetAccessFlags & ~accessFlags) == 0 &&
(requiredUnsetAccessFlags & accessFlags) == 0 &&
(requiredOneSetAccessFlags == 0 ||
(requiredOneSetAccessFlags & accessFlags) != 0);
}
}
|