01: /*
02: (c) Copyright 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP, all rights reserved.
03: [See end of file]
04: $Id: Optional.java,v 1.5 2008/01/02 12:06:04 andy_seaborne Exp $
05: */
06: package com.hp.hpl.jena.graph.query.regexptrees;
07:
08: /**
09: Optional - expresses a pattern which may or may not match the operand
10: expression.
11:
12: @author kers
13: */
14:
15: public class Optional extends Repeated {
16: public Optional(RegexpTree operand) {
17: super (operand);
18: }
19:
20: public int hashCode() {
21: return operand.hashCode();
22: }
23:
24: public boolean equals(Object x) {
25: return x instanceof Optional
26: && operand.equals(((Optional) x).operand);
27: }
28:
29: public String toString() {
30: return "<optional " + operand.toString() + ">";
31: }
32: }
33:
34: /*
35: (c) Copyright 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
36: All rights reserved.
37:
38: Redistribution and use in source and binary forms, with or without
39: modification, are permitted provided that the following conditions
40: are met:
41:
42: 1. Redistributions of source code must retain the above copyright
43: notice, this list of conditions and the following disclaimer.
44:
45: 2. Redistributions in binary form must reproduce the above copyright
46: notice, this list of conditions and the following disclaimer in the
47: documentation and/or other materials provided with the distribution.
48:
49: 3. The name of the author may not be used to endorse or promote products
50: derived from this software without specific prior written permission.
51:
52: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
53: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
54: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
55: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
56: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
57: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
58: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
59: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
60: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
61: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
62: */
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