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Java > Open Source Codes > edu > umd > cs > findbugs > visitclass > LVTHelper


1 /*
2  * FindBugs - Find bugs in Java programs
3  * Copyright (C) 2004,2005 Dave Brosius <dbrosius@users.sourceforge.net>
4  * Copyright (C) 2004,2005 University of Maryland
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19  */
20
21 package edu.umd.cs.findbugs.visitclass;
22
23 import org.apache.bcel.classfile.LocalVariable;
24 import org.apache.bcel.classfile.LocalVariableTable;
25
26 import edu.umd.cs.findbugs.annotations.NonNull;
27
28 /**
29  * Eases access to a BCEL LocalVariable object
30  */
31 public class LVTHelper
32 {
33     /**
34      * returns the local variable at an index int the scope of PC
35      *
36      * @param lvt the local variable table
37      * @param index the variable index
38      * @param pc the PC where the variable is used
39      */
40     public static LocalVariable getLocalVariableAtPC(@NonNull LocalVariableTable lvt, int index, int pc) {
41         int length = lvt.getTableLength();
42         LocalVariable[] lvs = lvt.getLocalVariableTable();
43         
44         for(int i = 0; i < length; i++) {
45             if (lvs[i].getIndex() == index) {
46                 int startPC = lvs[i].getStartPC();
47                 if ((pc >= startPC) && (pc < (startPC + lvs[i].getLength())))
48                     return lvs[i];
49             }
50         }
51         
52         return null;
53     }
54 }
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