01: /******************************************************************
02: * File: NotEqual.java
03: * Created by: Dave Reynolds
04: * Created on: 13-Apr-03
05: *
06: * (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
07: * [See end of file]
08: * $Id: NotEqual.java,v 1.12 2008/01/02 12:06:21 andy_seaborne Exp $
09: *****************************************************************/package com.hp.hpl.jena.reasoner.rulesys.builtins;
10:
11: import com.hp.hpl.jena.reasoner.rulesys.*;
12: import com.hp.hpl.jena.graph.*;
13:
14: //Thanks to Bradley Schatz (Bradley@greystate.com) for code patches
15: //to support XSDDateTime comparisons
16:
17: /**
18: * Check that the two args are different. This uses a semantic equality test.
19: *
20: * @author <a href="mailto:der@hplb.hpl.hp.com">Dave Reynolds</a>
21: * @version $Revision: 1.12 $ on $Date: 2008/01/02 12:06:21 $
22: */
23: public class NotEqual extends BaseBuiltin {
24:
25: /**
26: * Return a name for this builtin, normally this will be the name of the
27: * functor that will be used to invoke it.
28: */
29: public String getName() {
30: return "notEqual";
31: }
32:
33: /**
34: * Return the expected number of arguments for this functor or 0 if the number is flexible.
35: */
36: public int getArgLength() {
37: return 2;
38: }
39:
40: /**
41: * This method is invoked when the builtin is called in a rule body.
42: * @param args the array of argument values for the builtin, this is an array
43: * of Nodes, some of which may be Node_RuleVariables.
44: * @param length the length of the argument list, may be less than the length of the args array
45: * for some rule engines
46: * @param context an execution context giving access to other relevant data
47: * @return return true if the buildin predicate is deemed to have succeeded in
48: * the current environment
49: */
50: public boolean bodyCall(Node[] args, int length, RuleContext context) {
51: checkArgs(length, context);
52: Node n1 = getArg(0, args, context);
53: Node n2 = getArg(1, args, context);
54: if (Util.isNumeric(n1)) {
55: return Util.compareNumbers(n1, n2) != 0;
56: } else if (Util.isInstant(n1) && Util.isInstant(n2)) {
57: return Util.compareInstants(n1, n2) != 0;
58: } else {
59: return !n1.sameValueAs(n2);
60: }
61: }
62:
63: }
64:
65: /*
66: (c) Copyright 2003, 2004, 2005, 2006, 2007, 2008 Hewlett-Packard Development Company, LP
67: All rights reserved.
68:
69: Redistribution and use in source and binary forms, with or without
70: modification, are permitted provided that the following conditions
71: are met:
72:
73: 1. Redistributions of source code must retain the above copyright
74: notice, this list of conditions and the following disclaimer.
75:
76: 2. Redistributions in binary form must reproduce the above copyright
77: notice, this list of conditions and the following disclaimer in the
78: documentation and/or other materials provided with the distribution.
79:
80: 3. The name of the author may not be used to endorse or promote products
81: derived from this software without specific prior written permission.
82:
83: THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
84: IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
85: OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
86: IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
87: INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
88: NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
89: DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
90: THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
91: (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
92: THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
93: */
|