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Java > Open Source Codes > proguard > classfile > editor > ExceptionsEditor


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 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  */
21 package proguard.classfile.editor;
22
23 import proguard.classfile.attribute.ExceptionsAttribute;
24
25 /**
26  * This class can add exceptions to exceptions attributes. Exceptions to be
27  * added must have been added to the constant pool filled out beforehand.
28  *
29  * @author Eric Lafortune
30  */
31 public class ExceptionsEditor
32 {
33     /**
34      * Adds a given exception to the given exceptions attribute.
35      */
36   public void addException(ExceptionsAttribute exceptionsAttribute,
37                            int exceptionIndex)
38     {
39         int exceptionIndexTableLength = exceptionsAttribute.u2exceptionIndexTableLength;
40         int[] exceptionIndexTable = exceptionsAttribute.u2exceptionIndexTable;
41
42         // Make sure there is enough space for the new exception.
43 if (exceptionIndexTable.length <= exceptionIndexTableLength)
44         {
45             exceptionsAttribute.u2exceptionIndexTable = new int[exceptionIndexTableLength+1];
46             System.arraycopy(exceptionIndexTable, 0,
47                              exceptionsAttribute.u2exceptionIndexTable, 0,
48                              exceptionIndexTableLength);
49             exceptionIndexTable = exceptionsAttribute.u2exceptionIndexTable;
50         }
51
52         // Add the exception.
53 exceptionIndexTable[exceptionsAttribute.u2exceptionIndexTableLength++] = exceptionIndex;
54     }
55 }
56
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