1/* 2 * ProGuard -- shrinking, optimization, obfuscation, and preverification 3 * of Java bytecode. 4 * 5 * Copyright (c) 2002-2014 Eric Lafortune (eric@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 */ 21package proguard.classfile.editor; 22 23import proguard.classfile.attribute.ExceptionsAttribute; 24 25/** 26 * This class can add exceptions to a given exceptions attribute. 27 * Exceptions to be added must have been added to the constant pool and filled 28 * out beforehand. 29 * 30 * @author Eric Lafortune 31 */ 32public class ExceptionsAttributeEditor 33{ 34 private ExceptionsAttribute targetExceptionsAttribute; 35 36 37 /** 38 * Creates a new ExceptionsAttributeEditor that will edit exceptions in the 39 * given exceptions attribute. 40 */ 41 public ExceptionsAttributeEditor(ExceptionsAttribute targetExceptionsAttribute) 42 { 43 this.targetExceptionsAttribute = targetExceptionsAttribute; 44 } 45 46 47 /** 48 * Adds a given exception to the exceptions attribute. 49 */ 50 public void addException(int exceptionIndex) 51 { 52 int exceptionIndexTableLength = targetExceptionsAttribute.u2exceptionIndexTableLength; 53 int[] exceptionIndexTable = targetExceptionsAttribute.u2exceptionIndexTable; 54 55 // Make sure there is enough space for the new exception. 56 if (exceptionIndexTable.length <= exceptionIndexTableLength) 57 { 58 targetExceptionsAttribute.u2exceptionIndexTable = new int[exceptionIndexTableLength+1]; 59 System.arraycopy(exceptionIndexTable, 0, 60 targetExceptionsAttribute.u2exceptionIndexTable, 0, 61 exceptionIndexTableLength); 62 exceptionIndexTable = targetExceptionsAttribute.u2exceptionIndexTable; 63 } 64 65 // Add the exception. 66 exceptionIndexTable[targetExceptionsAttribute.u2exceptionIndexTableLength++] = exceptionIndex; 67 } 68} 69