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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.visitor;
     22 
     23 import proguard.classfile.*;
     24 import proguard.util.*;
     25 
     26 
     27 /**
     28  * This <code>MemberVisitor</code> delegates its visits to another given
     29  * <code>MemberVisitor</code>, but only when the visited member
     30  * has a name that matches a given regular expression.
     31  *
     32  * @author Eric Lafortune
     33  */
     34 public class MemberNameFilter implements MemberVisitor
     35 {
     36     private final StringMatcher regularExpressionMatcher;
     37     private final MemberVisitor memberVisitor;
     38 
     39 
     40     /**
     41      * Creates a new MemberNameFilter.
     42      * @param regularExpression the regular expression against which member
     43      *                          names will be matched.
     44      * @param memberVisitor     the <code>MemberVisitor</code> to which visits
     45      *                          will be delegated.
     46      */
     47     public MemberNameFilter(String        regularExpression,
     48                             MemberVisitor memberVisitor)
     49     {
     50         this(new ListParser(new NameParser()).parse(regularExpression),
     51              memberVisitor);
     52     }
     53 
     54 
     55     /**
     56      * Creates a new MemberNameFilter.
     57      * @param regularExpressionMatcher the regular expression against which
     58      *                                 member names will be matched.
     59      * @param memberVisitor            the <code>MemberVisitor</code> to which
     60      *                                 visits will be delegated.
     61      */
     62     public MemberNameFilter(StringMatcher regularExpressionMatcher,
     63                             MemberVisitor memberVisitor)
     64     {
     65         this.regularExpressionMatcher = regularExpressionMatcher;
     66         this.memberVisitor            = memberVisitor;
     67     }
     68 
     69 
     70     // Implementations for MemberVisitor.
     71 
     72     public void visitProgramField(ProgramClass programClass, ProgramField programField)
     73     {
     74         if (accepted(programField.getName(programClass)))
     75         {
     76             memberVisitor.visitProgramField(programClass, programField);
     77         }
     78     }
     79 
     80 
     81     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
     82     {
     83         if (accepted(programMethod.getName(programClass)))
     84         {
     85             memberVisitor.visitProgramMethod(programClass, programMethod);
     86         }
     87     }
     88 
     89 
     90     public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
     91     {
     92         if (accepted(libraryField.getName(libraryClass)))
     93         {
     94             memberVisitor.visitLibraryField(libraryClass, libraryField);
     95         }
     96     }
     97 
     98 
     99     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
    100     {
    101         if (accepted(libraryMethod.getName(libraryClass)))
    102         {
    103             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
    104         }
    105     }
    106 
    107 
    108     // Small utility methods.
    109 
    110     private boolean accepted(String name)
    111     {
    112         return regularExpressionMatcher.matches(name);
    113     }
    114 }
    115