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      1 /*
      2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
      3  *             of Java bytecode.
      4  *
      5  * Copyright (c) 2002-2009 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.classfile.constant.visitor.ConstantVisitor;
     25 import proguard.classfile.attribute.*;
     26 import proguard.classfile.attribute.visitor.ExceptionInfoVisitor;
     27 
     28 /**
     29  * This <code>ExceptionInfoVisitor</code> lets a given
     30  * <code>ConstantVisitor</code> visit all catch class constants of exceptions
     31  * that it visits.
     32  *
     33  * @author Eric Lafortune
     34  */
     35 public class ExceptionHandlerConstantVisitor
     36 implements   ExceptionInfoVisitor
     37 {
     38     private final ConstantVisitor constantVisitor;
     39 
     40 
     41     /**
     42      * Creates a new ExceptionHandlerConstantVisitor.
     43      * @param constantVisitor the ConstantVisitor that will visit the catch
     44      *                        class constants.
     45      */
     46     public ExceptionHandlerConstantVisitor(ConstantVisitor constantVisitor)
     47     {
     48         this.constantVisitor = constantVisitor;
     49     }
     50 
     51 
     52     // Implementations for ExceptionInfoVisitor.
     53 
     54     public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
     55     {
     56         int catchType = exceptionInfo.u2catchType;
     57         if (catchType != 0)
     58         {
     59             clazz.constantPoolEntryAccept(catchType, constantVisitor);
     60         }
     61     }
     62 }