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


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 import proguard.util.*;
25
26
27 /**
28  * This <code>ClassVisitor</code> delegates its visits to another given
29  * <code>ClassVisitor</code>, but only when the visited class has a name that
30  * matches a given regular expression.
31  *
32  * @author Eric Lafortune
33  */
34 public class ClassNameFilter implements ClassVisitor
35 {
36     private StringMatcher regularExpressionMatcher;
37     private ClassVisitor classVisitor;
38
39
40     /**
41      * Creates a new ClassNameFilter.
42      * @param regularExpression the regular expression against which class names
43      * will be matched.
44      * @param classVisitor the <code>ClassVisitor</code> to which visits
45      * will be delegated.
46      */
47     public ClassNameFilter(String JavaDoc regularExpression,
48                            ClassVisitor classVisitor)
49     {
50         this.regularExpressionMatcher = new ClassNameListMatcher(regularExpression);
51         this.classVisitor = classVisitor;
52     }
53
54
55     // Implementations for ClassVisitor.
56
57     public void visitProgramClass(ProgramClass programClass)
58     {
59         if (accepted(programClass.getName()))
60         {
61             classVisitor.visitProgramClass(programClass);
62         }
63     }
64
65
66     public void visitLibraryClass(LibraryClass libraryClass)
67     {
68         if (accepted(libraryClass.getName()))
69         {
70             classVisitor.visitLibraryClass(libraryClass);
71         }
72     }
73
74
75     // Small utility methods.
76
77     private boolean accepted(String JavaDoc name)
78     {
79         return regularExpressionMatcher.matches(name);
80     }
81 }
82
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