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Java > Open Source Codes > com > hp > hpl > jena > graph > query > Bound


1 /*
2   (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: Bound.java,v 1.8 2005/02/21 11:52:15 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph.query;
8 import com.hp.hpl.jena.graph.*;
9
10 /**
11     An element which represents an already-bound variable.
12     
13     @author hedgehog
14 */
15
16 public class Bound extends Element
17     {
18     /**
19         Initialise a Bound element: remember <code>n</code> as it is the index into the
20         Domain at which its value is stored.
21     */
22     public Bound( int n ) { super( n ); }
23     
24     /**
25         Answer true iff the node <code>x</code> matches the previously-seen value at
26         Donain[index]. The matching uses datatype-value semantics, implemented by
27         <code>Node::sameValueAs()</code>.
28     */
29     public boolean match( Domain d, Node x )
30         { return x.sameValueAs(d.get( index ) ); }
31      
32     public Node asNodeMatch( Domain d )
33         { return (Node) d.get( index ); }
34         
35     public String JavaDoc toString()
36         { return "<Bound " + index + ">"; }
37     }
38
39 /*
40     (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
41     All rights reserved.
42
43     Redistribution and use in source and binary forms, with or without
44     modification, are permitted provided that the following conditions
45     are met:
46
47     1. Redistributions of source code must retain the above copyright
48        notice, this list of conditions and the following disclaimer.
49
50     2. Redistributions in binary form must reproduce the above copyright
51        notice, this list of conditions and the following disclaimer in the
52        documentation and/or other materials provided with the distribution.
53
54     3. The name of the author may not be used to endorse or promote products
55        derived from this software without specific prior written permission.
56
57     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
58     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
59     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
60     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
61     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
62     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
63     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
64     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
65     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
66     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
67 */
68
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