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.visitor; 22 23 import proguard.classfile.*; 24 import proguard.classfile.attribute.*; 25 import proguard.classfile.attribute.visitor.ExceptionInfoVisitor; 26 27 /** 28 * This <code>ExceptionInfoVisitor</code> delegates its visits to another given 29 * <code>ExceptionInfoVisitor</code>, but only when the visited exception 30 * covers the instruction at the given offset. 31 * 32 * @author Eric Lafortune 33 */ 34 public class ExceptionOffsetFilter 35 implements ExceptionInfoVisitor 36 { 37 private final int instructionOffset; 38 private final ExceptionInfoVisitor exceptionInfoVisitor; 39 40 41 /** 42 * Creates a new ExceptionOffsetFilter. 43 * @param instructionOffset the instruction offset. 44 * @param exceptionInfoVisitor the ExceptionInfoVisitor to which visits 45 * will be delegated. 46 */ 47 public ExceptionOffsetFilter(int instructionOffset, 48 ExceptionInfoVisitor exceptionInfoVisitor) 49 { 50 this.instructionOffset = instructionOffset; 51 this.exceptionInfoVisitor = exceptionInfoVisitor; 52 } 53 54 55 // Implementations for ExceptionInfoVisitor. 56 57 public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo) 58 { 59 if (exceptionInfo.isApplicable(instructionOffset)) 60 { 61 exceptionInfoVisitor.visitExceptionInfo(clazz, method, codeAttribute, exceptionInfo); 62 } 63 } 64 } 65
