AnnotationTypeFilter.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.attribute.annotation.visitor;
22
23import proguard.classfile.*;
24import proguard.classfile.attribute.annotation.Annotation;
25import proguard.classfile.util.SimplifiedVisitor;
26import 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 */
35public class AnnotationTypeFilter
36extends      SimplifiedVisitor
37implements   AnnotationVisitor
38{
39    private final StringMatcher     regularExpressionMatcher;
40    private final 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            regularExpression,
51                                AnnotationVisitor annotationVisitor)
52    {
53        this.regularExpressionMatcher = new ListParser(new ClassNameParser()).parse(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 name)
99    {
100        return regularExpressionMatcher.matches(name);
101    }
102}
103