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


1 /*
2   (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: Bind.java,v 1.7 2005/02/21 11:52:13 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph.query;
8
9 import com.hp.hpl.jena.graph.*;
10
11 /**
12     A binding instance of a variable. It accepts any node and records it in the supplied
13     Domain at the index allocated to it when it is created.
14     
15     @author hedgehog
16 */
17 public class Bind extends Element
18     {
19     /**
20         Initialise a Bind element: remember the index <code>n</code> which is the
21         place in Domain's where it may store its value.
22     */
23     public Bind( int n ) { super( n ); }
24     
25     /**
26         Answer true after updating the domain to record the value this element binds.
27         @param d the domain in which to note this element is bound to <code>x</code>.
28         @return true [after side-effecting d]
29     */
30     public boolean match( Domain d, Node x )
31         {
32         d.setElement( index, x );
33         return true;
34         }
35         
36     /**
37         Answer Node.ANY, as a binding occurance of a variable can match anything.
38     */
39     public Node asNodeMatch( Domain d )
40         { return Node.ANY; }
41         
42     public String JavaDoc toString()
43         { return "<Bind " + index + ">"; }
44     }
45
46 /*
47     (c) Copyright 2002, 2003, 2004, 2005 Hewlett-Packard Development Company, LP
48     All rights reserved.
49
50     Redistribution and use in source and binary forms, with or without
51     modification, are permitted provided that the following conditions
52     are met:
53
54     1. Redistributions of source code must retain the above copyright
55        notice, this list of conditions and the following disclaimer.
56
57     2. Redistributions in binary form must reproduce the above copyright
58        notice, this list of conditions and the following disclaimer in the
59        documentation and/or other materials provided with the distribution.
60
61     3. The name of the author may not be used to endorse or promote products
62        derived from this software without specific prior written permission.
63
64     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
65     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
66     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
67     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
68     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
69     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
70     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
71     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
72     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
73     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
74 */
75
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