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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.optimize.info;
     22 
     23 import proguard.classfile.*;
     24 import proguard.classfile.visitor.MemberVisitor;
     25 
     26 /**
     27  * This MemberVisitor delegates all its method calls to another MemberVisitor,
     28  * but only for Method objects that are marked as having side effects.
     29  *
     30  * @see SideEffectMethodMarker
     31  *
     32  * @author Eric Lafortune
     33  */
     34 public class SideEffectMethodFilter
     35 implements   MemberVisitor
     36 {
     37     private final MemberVisitor memberVisitor;
     38 
     39 
     40     /**
     41      * Creates a new SideEffectMethodFilter.
     42      * @param memberVisitor the member visitor to which the visiting will be
     43      *                      delegated.
     44      */
     45     public SideEffectMethodFilter(MemberVisitor memberVisitor)
     46     {
     47         this.memberVisitor = memberVisitor;
     48     }
     49 
     50 
     51     // Implementations for MemberVisitor.
     52 
     53     public void visitProgramField(ProgramClass programClass, ProgramField programField) {}
     54     public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField) {}
     55 
     56 
     57     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
     58     {
     59         if (SideEffectMethodMarker.hasSideEffects(programMethod))
     60         {
     61             memberVisitor.visitProgramMethod(programClass, programMethod);
     62         }
     63     }
     64 
     65 
     66     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
     67     {
     68         if (SideEffectMethodMarker.hasSideEffects(libraryMethod))
     69         {
     70             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
     71         }
     72     }
     73 }