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Java > Open Source Codes > com > hp > hpl > jena > graph > query > regexptrees > Nothing


1 /*
2   (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP, all rights reserved.
3   [See end of file]
4   $Id: Nothing.java,v 1.2 2005/02/21 11:52:29 andy_seaborne Exp $
5 */
6 package com.hp.hpl.jena.graph.query.regexptrees;
7
8
9 /**
10      Nothing - the empty pattern (which matches the empty string)
11      @author kers
12 */
13 public class Nothing extends RegexpTree
14     {
15     public boolean equals( Object JavaDoc other )
16         { return other instanceof Nothing; }
17
18     public int hashCode()
19         { return 0; }
20
21     public String JavaDoc toString()
22         { return "<nothing>"; }
23     }
24
25
26 /*
27     (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP
28     All rights reserved.
29     
30     Redistribution and use in source and binary forms, with or without
31     modification, are permitted provided that the following conditions
32     are met:
33     
34     1. Redistributions of source code must retain the above copyright
35        notice, this list of conditions and the following disclaimer.
36     
37     2. Redistributions in binary form must reproduce the above copyright
38        notice, this list of conditions and the following disclaimer in the
39        documentation and/or other materials provided with the distribution.
40     
41     3. The name of the author may not be used to endorse or promote products
42        derived from this software without specific prior written permission.
43     
44     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
45     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
46     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
47     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
48     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
49     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
53     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54 */
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