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Java > Open Source Codes > soot > jimple > toolkits > annotation > tags > NullCheckTag


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 2000 Feng Qian
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */

19
20 /*
21  * Modified by the Sable Research Group and others 1997-1999.
22  * See the 'credits' file distributed with Soot for the complete list of
23  * contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
24  */

25
26
27 package soot.jimple.toolkits.annotation.tags;
28
29 /** NullCheckTag contains the null pointer check information.
30  * The right third bit of a byte is used to represent whether
31  * the null check is needed.
32  */

33
34 public class NullCheckTag implements OneByteCodeTag
35 {
36     private final static String JavaDoc NAME = "NullCheckTag";
37     
38     private byte value = 0;
39
40     public NullCheckTag(boolean needCheck)
41     {
42         if (needCheck)
43         value = 0x04;
44     }
45
46     public String JavaDoc getName()
47     {
48     return NAME;
49     }
50
51     public byte[] getValue()
52     {
53         byte[] bv = new byte[1];
54     bv[0] = value;
55     return bv;
56     }
57
58     public boolean needCheck()
59     {
60         if (value == 0)
61         return false;
62     else
63         return true;
64     }
65
66     public String JavaDoc toString()
67     {
68     return ((value==0)?"[not null]":"[unknown]");
69     }
70 }
71
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