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/*
* ProGuard -- shrinking, optimization, obfuscation, and preverification
* of Java bytecode.
*
* Copyright (c) 2002-2013 Eric Lafortune (eric@graphics.cornell.edu)
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package proguard.classfile.visitor;
import proguard.classfile.*;
import proguard.classfile.attribute.*;
import proguard.classfile.attribute.visitor.ExceptionInfoVisitor;
/**
* This <code>ExceptionInfoVisitor</code> delegates its visits to another given
* <code>ExceptionInfoVisitor</code>, but only when the visited exception
* targets an instruction in the given range of offsets.
*
* @author Eric Lafortune
*/
public class ExceptionHandlerFilter
implements ExceptionInfoVisitor
{
private final int startOffset;
private final int endOffset;
private final ExceptionInfoVisitor exceptionInfoVisitor;
/**
* Creates a new ExceptionHandlerFilter.
* @param startOffset the start of the instruction offset range.
* @param endOffset the end of the instruction offset range.
* @param exceptionInfoVisitor the ExceptionInfoVisitor to which visits
* will be delegated.
*/
public ExceptionHandlerFilter(int startOffset,
int endOffset,
ExceptionInfoVisitor exceptionInfoVisitor)
{
this.startOffset = startOffset;
this.endOffset = endOffset;
this.exceptionInfoVisitor = exceptionInfoVisitor;
}
// Implementations for ExceptionInfoVisitor.
public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
{
int handlerPC = exceptionInfo.u2handlerPC;
if (handlerPC >= startOffset &&
handlerPC < endOffset)
{
exceptionInfoVisitor.visitExceptionInfo(clazz, method, codeAttribute, exceptionInfo);
}
}
}
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