01: /*
02: (c) Copyright 2002, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
03: [See end of file]
04: $Id: Difference.java,v 1.9 2008/01/02 12:10:20 andy_seaborne Exp $
05: */
06:
07: package com.hp.hpl.jena.graph.compose;
08:
09: import com.hp.hpl.jena.graph.*;
10: import com.hp.hpl.jena.util.iterator.*;
11:
12: /**
13: Class representing the dynamic set difference L - R of two graphs. This is updatable;
14: the updates are written through to one or other of the base graphs.
15: @author hedgehog
16: */
17:
18: public class Difference extends Dyadic implements Graph {
19: /**
20: Initialise a graph representing the difference L - R.
21: */
22: public Difference(Graph L, Graph R) {
23: super (L, R);
24: }
25:
26: /**
27: Add a triple to the difference: add it to the left operand, and remove it from the
28: right operand.
29: */
30: public void performAdd(Triple t) {
31: L.add(t);
32: R.delete(t);
33: }
34:
35: /**
36: Remove a triple from the difference: remove it from the left operand. [It could
37: be added to the right operand instead, but somehow that feels less satisfactory.]
38: */
39: public void performDelete(Triple t) {
40: L.delete(t);
41: }
42:
43: public ExtendedIterator graphBaseFind(TripleMatch t) {
44: return L.find(t).filterDrop(ifIn(R));
45: }
46: }
47:
48: /*
49: (c) Copyright 2002, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
50: All rights reserved.
51:
52: Redistribution and use in source and binary forms, with or without
53: modification, are permitted provided that the following conditions
54: are met:
55:
56: 1. Redistributions of source code must retain the above copyright
57: notice, this list of conditions and the following disclaimer.
58:
59: 2. Redistributions in binary form must reproduce the above copyright
60: notice, this list of conditions and the following disclaimer in the
61: documentation and/or other materials provided with the distribution.
62:
63: 3. The name of the author may not be used to endorse or promote products
64: derived from this software without specific prior written permission.
65:
66: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
67: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
68: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
69: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
70: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
71: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
72: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
73: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
74: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
75: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
76: */
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