1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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
36implements   AnnotationVisitor
37{
38    private final StringMatcher     regularExpressionMatcher;
39    private final AnnotationVisitor annotationVisitor;
40
41
42    /**
43     * Creates a new ClassNameFilter.
44     * @param regularExpression the regular expression against which annotation
45     *                          type names will be matched.
46     * @param annotationVisitor the <code>annotationVisitor</code> to which
47     *                          visits will be delegated.
48     */
49    public AnnotationTypeFilter(String            regularExpression,
50                                AnnotationVisitor annotationVisitor)
51    {
52        this.regularExpressionMatcher = new ListParser(new ClassNameParser()).parse(regularExpression);
53        this.annotationVisitor        = annotationVisitor;
54    }
55
56
57    // Implementations for AnnotationVisitor.
58
59    public void visitAnnotation(Clazz clazz, Annotation annotation)
60    {
61        if (accepted(annotation.getType(clazz)))
62        {
63            annotationVisitor.visitAnnotation(clazz, annotation);
64        }
65    }
66
67
68    public void visitAnnotation(Clazz clazz, Field field, Annotation annotation)
69    {
70        if (accepted(annotation.getType(clazz)))
71        {
72            annotationVisitor.visitAnnotation(clazz, field, annotation);
73        }
74    }
75
76
77    public void visitAnnotation(Clazz clazz, Method method, Annotation annotation)
78    {
79        if (accepted(annotation.getType(clazz)))
80        {
81            annotationVisitor.visitAnnotation(clazz, method, annotation);
82        }
83    }
84
85
86    public void visitAnnotation(Clazz clazz, Method method, int parameterIndex, Annotation annotation)
87    {
88        if (accepted(annotation.getType(clazz)))
89        {
90            annotationVisitor.visitAnnotation(clazz, method, parameterIndex, annotation);
91        }
92    }
93
94
95    // Small utility methods.
96
97    private boolean accepted(String name)
98    {
99        return regularExpressionMatcher.matches(name);
100    }
101}
102