1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2013 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.*;
24
25/**
26 * This class can add local variables to a given local variable table attribute.
27 * Local variables to be added must have been filled out beforehand.
28 *
29 * @author Eric Lafortune
30 */
31public class LocalVariableTableAttributeEditor
32{
33    private LocalVariableTableAttribute targetLocalVariableTableAttribute;
34
35
36    /**
37     * Creates a new LocalVariableTableAttributeEditor that will edit line numbers
38     * in the given line number table attribute.
39     */
40    public LocalVariableTableAttributeEditor(LocalVariableTableAttribute targetLocalVariableTableAttribute)
41    {
42        this.targetLocalVariableTableAttribute = targetLocalVariableTableAttribute;
43    }
44
45
46    /**
47     * Adds a given line number to the line number table attribute.
48     */
49    public void addLocalVariableInfo(LocalVariableInfo localVariableInfo)
50    {
51        int                 localVariableTableLength = targetLocalVariableTableAttribute.u2localVariableTableLength;
52        LocalVariableInfo[] localVariableTable       = targetLocalVariableTableAttribute.localVariableTable;
53
54        // Make sure there is enough space for the new localVariableInfo.
55        if (localVariableTable.length <= localVariableTableLength)
56        {
57            targetLocalVariableTableAttribute.localVariableTable = new LocalVariableInfo[localVariableTableLength+1];
58            System.arraycopy(localVariableTable, 0,
59                             targetLocalVariableTableAttribute.localVariableTable, 0,
60                             localVariableTableLength);
61            localVariableTable = targetLocalVariableTableAttribute.localVariableTable;
62        }
63
64        // Add the localVariableInfo.
65        localVariableTable[targetLocalVariableTableAttribute.u2localVariableTableLength++] = localVariableInfo;
66    }
67}