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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2014 Eric Lafortune (eric (at) 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.CodeAttribute;
     25 import proguard.classfile.attribute.annotation.Annotation;
     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 implements   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     public void visitAnnotation(Clazz clazz, Method method, CodeAttribute codeAttribute, Annotation annotation)
     96     {
     97         if (accepted(annotation.getType(clazz)))
     98         {
     99             annotationVisitor.visitAnnotation(clazz, method, codeAttribute, annotation);
    100         }
    101     }
    102 
    103 
    104     // Small utility methods.
    105 
    106     private boolean accepted(String name)
    107     {
    108         return regularExpressionMatcher.matches(name);
    109     }
    110 }
    111