/* * ProGuard -- shrinking, optimization, obfuscation, and preverification * of Java bytecode. * * Copyright (c) 2002-2011 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); } } }