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Java > Open Source Codes > com > hp > hpl > jena > graph > compose > Intersection


1 /*
2   (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
3   [See end of file]
4   $Id: Intersection.java,v 1.6 2005/02/21 11:52:04 andy_seaborne Exp $
5 */
6
7 /*
8     INSERT HP DISCLAIMER HERE
9     
10     Dynamic intersection, May 2002, hedgehog
11 */
12
13 package com.hp.hpl.jena.graph.compose;
14
15 import com.hp.hpl.jena.graph.*;
16 import com.hp.hpl.jena.util.iterator.*;
17
18
19 /**
20     an implementation of a dynamic intersection of two models.
21
22     @author hedgehog
23 */
24
25 public class Intersection extends Dyadic implements Graph
26     {
27     public Intersection( Graph L, Graph R )
28         {
29         super( L, R );
30         }
31         
32     public void performAdd( Triple t )
33         {
34         L.add( t );
35         R.add( t );
36         }
37
38     public void performDelete( Triple t )
39         {
40         if (this.contains( t )) L.delete( t );
41         }
42         
43     public ExtendedIterator graphBaseFind( TripleMatch s )
44         {
45         return L.find( s ) .filterKeep( ifIn( R ) );
46         }
47     }
48     
49
50 /*
51     (c) Copyright 2003, 2004, 2005 Hewlett-Packard Development Company, LP
52     All rights reserved.
53
54     Redistribution and use in source and binary forms, with or without
55     modification, are permitted provided that the following conditions
56     are met:
57
58     1. Redistributions of source code must retain the above copyright
59        notice, this list of conditions and the following disclaimer.
60
61     2. Redistributions in binary form must reproduce the above copyright
62        notice, this list of conditions and the following disclaimer in the
63        documentation and/or other materials provided with the distribution.
64
65     3. The name of the author may not be used to endorse or promote products
66        derived from this software without specific prior written permission.
67
68     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
69     IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
70     OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
71     IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
72     INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
73     NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
74     DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
75     THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
76     (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
77     THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
78 */
79
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