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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;
     22 
     23 import proguard.classfile.*;
     24 import proguard.classfile.visitor.MemberVisitor;
     25 import proguard.optimize.info.*;
     26 
     27 /**
     28  * This <code>MemberVisitor</code> delegates its visits to another given
     29  * <code>MemberVisitor</code>, but only when the visited member has optimization
     30  * info.
     31  *
     32  * @see FieldOptimizationInfo
     33  * @see MethodOptimizationInfo
     34  * @author Eric Lafortune
     35  */
     36 public class OptimizationInfoMemberFilter
     37 implements   MemberVisitor
     38 {
     39     private final MemberVisitor memberVisitor;
     40 
     41 
     42     /**
     43      * Creates a new OptimizationInfoMemberFilter.
     44      * @param memberVisitor the <code>MemberVisitor</code> to which visits will
     45      *                      be delegated.
     46      */
     47     public OptimizationInfoMemberFilter(MemberVisitor memberVisitor)
     48     {
     49         this.memberVisitor = memberVisitor;
     50     }
     51 
     52 
     53     // Implementations for MemberVisitor.
     54 
     55 
     56     public void visitProgramField(ProgramClass programClass, ProgramField programField)
     57     {
     58         // Does the field have optimization info?
     59         if (FieldOptimizationInfo.getFieldOptimizationInfo(programField) != null)
     60         {
     61             memberVisitor.visitProgramField(programClass, programField);
     62         }
     63     }
     64 
     65 
     66     public void visitLibraryField(LibraryClass libraryClass, LibraryField libraryField)
     67     {
     68         // Does the field have optimization info?
     69         if (FieldOptimizationInfo.getFieldOptimizationInfo(libraryField) != null)
     70         {
     71             memberVisitor.visitLibraryField(libraryClass, libraryField);
     72         }
     73     }
     74 
     75 
     76     public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
     77     {
     78         // Does the method have optimization info?
     79         if (MethodOptimizationInfo.getMethodOptimizationInfo(programMethod) != null)
     80         {
     81             memberVisitor.visitProgramMethod(programClass, programMethod);
     82         }
     83     }
     84 
     85 
     86     public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
     87     {
     88         // Does the method have optimization info?
     89         if (MethodOptimizationInfo.getMethodOptimizationInfo(libraryMethod) != null)
     90         {
     91             memberVisitor.visitLibraryMethod(libraryClass, libraryMethod);
     92         }
     93     }
     94 }
     95