| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2009 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); |
| } |
| } |
| } |