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


1 /*
2   (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: SlotValuator.java,v 1.3 2005/02/21 11:52:25 andy_seaborne Exp $
5 */
6
7 package com.hp.hpl.jena.graph.query;
8
9 /**
10     A SlotValuator evaluates to a specific slot in the index values
11     bindings.
12     @author hedgehog
13 */
14
15 public class SlotValuator implements Valuator
16     {
17     /**
18         The index in the index values which this SlotValuator
19         looks up.
20     */
21     private int index;
22     
23     /**
24         Initialise this SlotValuator with the index to use for lookup.
25     */
26     public SlotValuator( int index )
27         { this.index = index; }
28
29     /**
30         Answer the value of the <code>index</code>th element of the
31         index values bindings.
32     */
33     public Object JavaDoc evalObject( IndexValues iv )
34         { return iv.get( index ); }
35     
36     /**
37         Answer the primitive boolean value of the <code>index</code>th
38         element of the index value bindings, which must be a
39         <code>Boolean</code> value.
40     */
41     public boolean evalBool( IndexValues iv )
42         { return ((Boolean JavaDoc) evalObject( iv )).booleanValue(); }
43     }
44
45 /*
46     (c) Copyright 2004, 2005 Hewlett-Packard Development Company, LP
47     All rights reserved.
48     
49     Redistribution and use in source and binary forms, with or without
50     modification, are permitted provided that the following conditions
51     are met:
52     
53     1. Redistributions of source code must retain the above copyright
54        notice, this list of conditions and the following disclaimer.
55     
56     2. Redistributions in binary form must reproduce the above copyright
57        notice, this list of conditions and the following disclaimer in the
58        documentation and/or other materials provided with the distribution.
59     
60     3. The name of the author may not be used to endorse or promote products
61        derived from this software without specific prior written permission.
62     
63     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
64     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
65     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
66     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
67     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
68     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
69     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
70     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
71     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
72     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
73 */
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