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Java > Open Source Codes > proguard > classfile > attribute > annotation > visitor > AnnotationTypeFilter


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.attribute.annotation.visitor;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.annotation.Annotation;
25 import proguard.classfile.util.SimplifiedVisitor;
26 import proguard.util.*;
27
28 /**
29  * This <code>AnnotationVisitor</code> delegates its visits to another given
30  * <code>AnnotationVisitor</code>, but only when the visited annotation has
31  * a type that matches a given regular expression.
32  *
33  * @author Eric Lafortune
34  */
35 public class AnnotationTypeFilter
36 extends SimplifiedVisitor
37 implements AnnotationVisitor
38 {
39     private StringMatcher regularExpressionMatcher;
40     private AnnotationVisitor annotationVisitor;
41
42
43     /**
44      * Creates a new ClassNameFilter.
45      * @param regularExpression the regular expression against which annotation
46      * type names will be matched.
47      * @param annotationVisitor the <code>annotationVisitor</code> to which
48      * visits will be delegated.
49      */
50     public AnnotationTypeFilter(String JavaDoc regularExpression,
51                                 AnnotationVisitor annotationVisitor)
52     {
53         this.regularExpressionMatcher = new ClassNameListMatcher(regularExpression);
54         this.annotationVisitor = annotationVisitor;
55     }
56
57
58     // Implementations for AnnotationVisitor.
59
60     public void visitAnnotation(Clazz clazz, Annotation annotation)
61     {
62         if (accepted(annotation.getType(clazz)))
63         {
64             annotationVisitor.visitAnnotation(clazz, annotation);
65         }
66     }
67
68
69     public void visitAnnotation(Clazz clazz, Field field, Annotation annotation)
70     {
71         if (accepted(annotation.getType(clazz)))
72         {
73             annotationVisitor.visitAnnotation(clazz, field, annotation);
74         }
75     }
76
77
78     public void visitAnnotation(Clazz clazz, Method method, Annotation annotation)
79     {
80         if (accepted(annotation.getType(clazz)))
81         {
82             annotationVisitor.visitAnnotation(clazz, method, annotation);
83         }
84     }
85
86
87     public void visitAnnotation(Clazz clazz, Method method, int parameterIndex, Annotation annotation)
88     {
89         if (accepted(annotation.getType(clazz)))
90         {
91             annotationVisitor.visitAnnotation(clazz, method, parameterIndex, annotation);
92         }
93     }
94
95
96     // Small utility methods.
97
98     private boolean accepted(String JavaDoc name)
99     {
100         return regularExpressionMatcher.matches(name);
101     }
102 }
103
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