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Java > Open Source Codes > edu > umd > cs > findbugs > ba > ResourceValue


1 /*
2  * Bytecode Analysis Framework
3  * Copyright (C) 2003,2004 University of Maryland
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19
20 package edu.umd.cs.findbugs.ba;
21
22 public class ResourceValue {
23     private ResourceValue() {
24     }
25
26     private static final ResourceValue instance = new ResourceValue();
27     private static final ResourceValue notInstance = new ResourceValue();
28
29     public static ResourceValue instance() {
30         return instance;
31     }
32
33     public static ResourceValue notInstance() {
34         return notInstance;
35     }
36
37     public static ResourceValue merge(ResourceValue a, ResourceValue b) {
38         if (a == notInstance && b == notInstance)
39             return notInstance;
40         else
41             return instance;
42     }
43
44     public boolean isInstance() {
45         return this == instance;
46     }
47
48     @Override JavaDoc
49          public String JavaDoc toString() {
50         return (this == instance) ? "I" : "-";
51     }
52 }
53
54 // vim:ts=4
55
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