Home | History | Annotate | Download | only in obfuscate 
      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.obfuscate;
     22 
     23 import proguard.classfile.*;
     24 import proguard.classfile.visitor.MemberVisitor;
     25 
     26 /**
     27  * This <code>MemberVisitor</code> delegates its visits to another given
     28  * <code>MemberVisitor</code>, but only when the visited member has a
     29  * special new name. A special name is a name that might have been produced by
     30  * a <code>SpecialNameFactory</code>.
     31  *
     32  * @see MemberObfuscator
     33  * @see SpecialNameFactory
     34  *
     35  * @author Eric Lafortune
     36  */
     37 public class MemberSpecialNameFilter implements MemberVisitor
     38 {
     39     private final MemberVisitor memberVisitor;
     40 
     41 
     42     /**
     43      * Creates a new MemberSpecialNameFilter.
     44      * @param memberVisitor the <code>MemberVisitor</code> to which
     45      *                      visits will be delegated.
     46      */
     47     public MemberSpecialNameFilter(MemberVisitor memberVisitor)
     48     {
     49         this.memberVisitor = memberVisitor;
     50     }
     51 
     52 
     53     // Implementations for MemberVisitor.
     54 
     55     public void visitProgramField(ProgramClass programClass, ProgramField programField)
     56     {
     57         if (hasSpecialName(programField))
     58         {
     59             memberVisitor.visitProgramField(programClass, programField);
     60         }
     61     }
     62 
     63 
     64     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
     65     {
     66         if (hasSpecialName(programMethod))
     67         {
     68             memberVisitor.visitProgramMethod(programClass, programMethod);
     69         }
     70     }
     71 
     72 
     73     public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
     74     {
     75         if (hasSpecialName(libraryField))
     76         {
     77             memberVisitor.visitLibraryField(libraryClass, libraryField);
     78         }
     79     }
     80 
     81 
     82     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
     83     {
     84         if (hasSpecialName(libraryMethod))
     85         {
     86             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
     87         }
     88     }
     89 
     90 
     91     // Small utility methods.
     92 
     93     /**
     94      * Returns whether the given class member has a special new name.
     95      * @param member the class member.
     96      */
     97     private static boolean hasSpecialName(Member member)
     98     {
     99         return SpecialNameFactory.isSpecialName(MemberObfuscator.newMemberName(member));
    100     }
    101 }
    102