01: /*
02: (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP, all rights reserved.
03: [See end of file]
04: $Id: Util.java,v 1.9 2008/01/02 12:07:58 andy_seaborne Exp $
05: */
06:
07: package com.hp.hpl.jena.graph.query;
08:
09: import java.util.Set;
10:
11: import com.hp.hpl.jena.graph.*;
12: import com.hp.hpl.jena.util.CollectionFactory;
13:
14: /**
15: Util: some utility code used by graph query that doesn't seem to belong
16: anywhere else that it can be put.
17:
18: @author kers
19: */
20: public class Util {
21: /**
22: Answer a new set which is the union of the two argument sets.
23: */
24: public static Set union(Set x, Set y) {
25: Set result = CollectionFactory.createHashedSet(x);
26: result.addAll(y);
27: return result;
28: }
29:
30: /**
31: Answer a new set which contains exactly the names of the variable[ node]s
32: in the triple.
33: */
34: public static Set variablesOf(Triple t) {
35: Set result = CollectionFactory.createHashedSet();
36: addIfVariable(result, t.getSubject());
37: addIfVariable(result, t.getPredicate());
38: addIfVariable(result, t.getObject());
39: return result;
40: }
41:
42: private static void addIfVariable(Set result, Node n) {
43: if (n.isVariable())
44: result.add(n.getName());
45: }
46: }
47:
48: /*
49: (c) Copyright 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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