Home | History | Annotate | Download | only in editor 
      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.editor;
     22 
     23 import proguard.classfile.*;
     24 import proguard.classfile.attribute.*;
     25 import proguard.classfile.attribute.visitor.ExceptionInfoVisitor;
     26 
     27 /**
     28  * This ExceptionInfoVisitor adds all exception information that it visits to
     29  * the given target code attribute.
     30  *
     31  * @author Eric Lafortune
     32  */
     33 public class ExceptionInfoAdder
     34 implements   ExceptionInfoVisitor
     35 {
     36     private final ConstantAdder         constantAdder;
     37     private final CodeAttributeComposer codeAttributeComposer;
     38 
     39 
     40     /**
     41      * Creates a new ExceptionAdder that will copy exceptions into the given
     42      * target code attribute.
     43      */
     44     public ExceptionInfoAdder(ProgramClass          targetClass,
     45                               CodeAttributeComposer targetComposer)
     46     {
     47         constantAdder         = new ConstantAdder(targetClass);
     48         codeAttributeComposer = targetComposer;
     49     }
     50 
     51 
     52     // Implementations for ExceptionInfoVisitor.
     53 
     54     public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
     55     {
     56         // Create a copy of the exception info.
     57         ExceptionInfo newExceptionInfo =
     58             new ExceptionInfo(exceptionInfo.u2startPC,
     59                               exceptionInfo.u2endPC,
     60                               exceptionInfo.u2handlerPC,
     61                               exceptionInfo.u2catchType == 0 ? 0 :
     62                                   constantAdder.addConstant(clazz, exceptionInfo.u2catchType));
     63 
     64         // Add the completed exception info.
     65         codeAttributeComposer.appendException(newExceptionInfo);
     66     }
     67 }