LocalVariableTypeTableAttributeEditor.java revision cfead78069f3dc32998dc118ee08cab3867acea2 
1/*
2 * ProGuard -- shrinking, optimization, obfuscation, and preverification
3 *             of Java bytecode.
4 *
5 * Copyright (c) 2002-2011 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 type table
27 * attribute.
28 * Local variable types to be added must have been filled out beforehand.
29 *
30 * @author Eric Lafortune
31 */
32public class LocalVariableTypeTableAttributeEditor
33{
34    private LocalVariableTypeTableAttribute targetLocalVariableTypeTableAttribute;
35
36
37    /**
38     * Creates a new LocalVariableTypeTableAttributeEditor that will edit line numbers
39     * in the given line number table attribute.
40     */
41    public LocalVariableTypeTableAttributeEditor(LocalVariableTypeTableAttribute targetLocalVariableTypeTableAttribute)
42    {
43        this.targetLocalVariableTypeTableAttribute = targetLocalVariableTypeTableAttribute;
44    }
45
46
47    /**
48     * Adds a given line number to the line number table attribute.
49     */
50    public void addLocalVariableTypeInfo(LocalVariableTypeInfo localVariableTypeInfo)
51    {
52        int                     localVariableTypeTableLength = targetLocalVariableTypeTableAttribute.u2localVariableTypeTableLength;
53        LocalVariableTypeInfo[] localVariableTypeTable       = targetLocalVariableTypeTableAttribute.localVariableTypeTable;
54
55        // Make sure there is enough space for the new localVariableTypeInfo.
56        if (localVariableTypeTable.length <= localVariableTypeTableLength)
57        {
58            targetLocalVariableTypeTableAttribute.localVariableTypeTable = new LocalVariableTypeInfo[localVariableTypeTableLength+1];
59            System.arraycopy(localVariableTypeTable, 0,
60                             targetLocalVariableTypeTableAttribute.localVariableTypeTable, 0,
61                             localVariableTypeTableLength);
62            localVariableTypeTable = targetLocalVariableTypeTableAttribute.localVariableTypeTable;
63        }
64
65        // Add the localVariableTypeInfo.
66        localVariableTypeTable[targetLocalVariableTypeTableAttribute.u2localVariableTypeTableLength++] = localVariableTypeInfo;
67    }
68}